3
3.0
Jun 29, 2018
06/18
by
DIRAC Collaboration
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The observation of hydrogen-like $\pi K$ atoms, consisting of $\pi^- K^+$ or $\pi^+ K^-$ mesons, is presented. The atoms have been produced by 24 GeV/$c$ protons from the CERN PS accelerator, interacting with platinum or nickel foil targets. The breakup (ionisation) of $\pi K$ atoms in the same targets yields characteristic $\pi K$ pairs, called "atomic pairs", with small relative momenta in the pair centre-of-mass system. The upgraded DIRAC experiment has observed $349\pm62$ such...
Topic: High Energy Physics - Experiment
Source: http://arxiv.org/abs/1605.06103
3
3.0
Jun 29, 2018
06/18
by
Mohsen Khakzad
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We report a measurement of the exclusive production of pairs of charged pions in proton-proton collisions, dominated by the process $pp \rightarrow p^{(*)} \pi^{+}\pi^{-} p^{(*)}$, where $\rm p^{(*)}$ stands for a diffractively dissociated proton, the $\pi^{+} \pi^{-}$ pair is emitted at central rapidities $y$, and the incident protons stay intact or dissociate without detection ${\rm p^{(*)}}$. The measurement is performed with the CMS detector at the LHC, using a data sample corresponding to...
Topic: High Energy Physics - Experiment
Source: http://arxiv.org/abs/1610.08775
3
3.0
Jun 29, 2018
06/18
by
Bruno Lenzi
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A search for new spin-0 resonances decaying into two photons in the ATLAS experiment at the LHC is described. The analysis is based on $pp$ collision data at $\sqrt{s}$=13 TeV corresponding to integrated luminosities of 3.2/fb and 12.2/fb recorded in 2015 and 2016, respectively. A deviation from the Standard Model background-only hypothesis corresponding to 3.4 standard deviations is observed in the 2015 data for a resonance mass hypothesis of 730 GeV. No significant excess at such mass over...
Topic: High Energy Physics - Experiment
Source: http://arxiv.org/abs/1611.03308
4
4.0
Jun 30, 2018
06/18
by
ATLAS Collaboration
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The process pp--> W + J/psi provides a powerful probe of the production mechanism of charmonium in hadronic collisions, and is also sensitive to multiple parton interactions in the colliding protons. Using the 2011 ATLAS dataset of 4.5 fb-1 of sqrt{s} = 7 TeV pp collisions at the LHC, the first observation is made of the production of W + prompt J/psi events in hadronic collisions, using W-->mu+nu and J/psi-->mu+mu. A yield of 27.4+7.5-6.5 W + prompt J/psi events is observed, with a...
Topic: High Energy Physics - Experiment
Source: http://arxiv.org/abs/1401.2831
4
4.0
Jun 30, 2018
06/18
by
A. Tomaradze; S. Dobbs; T. Xiao; Kamal K. Seth; G. Bonvicini
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Using 580 pb$^{-1}$ of $e^+e^-$ annihilation data taken with the CLEO--c detector at $\psi(3770)$, the decay $D^0(\overline{D}^0)\to K^\pm\pi^\mp \pi^+\pi^-$ has been studied to make the highest precision measurement of $D^0$ mass, $M(D^0)=1864.845\pm0.025\pm0.022\pm0.053$ MeV, where the first error is statistical, the second error is systematic, and the third error is due to uncertainty in kaon masses. As an intermediate step of the present investigation the mass of the $K_S$ meson has been...
Topic: High Energy Physics - Experiment
Source: http://arxiv.org/abs/1402.1528
3
3.0
Jun 30, 2018
06/18
by
CMS Collaboration
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The production of a Z boson, decaying into two leptons and produced in association with one or more b jets, is studied using proton-proton collisions delivered by the LHC at a centre-of-mass energy of 7 TeV. The data were recorded in 2011 with the CMS detector and correspond to an integrated luminosity of 5 inverse femtobarns. The Z(ll) + b-jets cross sections (where ll = mu mu or ee) are measured separately for a Z boson produced with exactly one b jet and with at least two b jets. In...
Topic: High Energy Physics - Experiment
Source: http://arxiv.org/abs/1402.1521
6
6.0
Jun 30, 2018
06/18
by
ATLAS Collaboration
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eye 6
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The prompt and non-prompt production cross-sections for the chi_c1 and chi_c2 charmonium states are measured in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector at the LHC using 4.5 fb^-1 of integrated luminosity. The chi_c states are reconstructed through the radiative decay chi_c -> J/psi gamma (with J/psi -> mu+mu-) where photons are reconstructed from gamma -> e+e- conversions. The production rate of the chi_c2 state relative to the chi_c1 state is measured for prompt and...
Topic: High Energy Physics - Experiment
Source: http://arxiv.org/abs/1404.7035
4
4.0
Jun 30, 2018
06/18
by
ATLAS Collaboration
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The semiconductor tracker is a silicon microstrip detector forming part of the inner tracking system of the ATLAS experiment at the LHC. The operation and performance of the semiconductor tracker during the first years of LHC running are described. More than 99% of the detector modules were operational during this period, with an average intrinsic hit efficiency of (99.74 +/- 0.04)%. The evolution of the noise occupancy is discussed, and measurements of the Lorentz angle, delta-ray production...
Topic: High Energy Physics - Experiment
Source: http://arxiv.org/abs/1404.7473
3
3.0
Jun 28, 2018
06/18
by
ATLAS Collaboration
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eye 3
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The identification of jets containing $b$ hadrons is important for the physics programme of the ATLAS experiment at the Large Hadron Collider. Several algorithms to identify jets containing $b$ hadrons are described, ranging from those based on the reconstruction of an inclusive secondary vertex or the presence of tracks with large impact parameters to combined tagging algorithms making use of multi-variate discriminants. An independent $b$-tagging algorithm based on the reconstruction of muons...
Topic: High Energy Physics - Experiment
Source: http://arxiv.org/abs/1512.01094
3
3.0
Jun 28, 2018
06/18
by
ATLAS Collaboration
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eye 3
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This paper presents a new method of reconstructing the individual charged and neutral hadrons in tau decays with the ATLAS detector. The reconstructed hadrons are used to classify the decay mode and to calculate the visible four-momentum of reconstructed tau candidates, significantly improving the resolution with respect to the calibration in the existing tau reconstruction. The performance of the reconstruction algorithm is optimised and evaluated using simulation and validated using samples...
Topic: High Energy Physics - Experiment
Source: http://arxiv.org/abs/1512.05955
3
3.0
Jun 30, 2018
06/18
by
Francesco Spanò
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A review is presented of the most recent measurements of top quark strong and electroweak production performed by using data collected with the ATLAS detector in proton-proton collisions at sqrt(s) = 7 and 8 TeV at the Large Hadron Collider corresponding to integrated luminosities of up to about 4.7/fb and 20/fb, respectively.
Topic: High Energy Physics - Experiment
Source: http://arxiv.org/abs/1410.6904
4
4.0
Jun 30, 2018
06/18
by
ATLAS Collaboration
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eye 4
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A search is conducted for non-resonant new phenomena in dielectron and dimuon final states, originating from either contact interactions or large extra spatial dimensions. The LHC 2012 proton-proton collision dataset recorded by the ATLAS detector is used, corresponding to 20 fb$^{-1}$ at $\sqrt{s}$ = 8 TeV. The dilepton invariant mass spectrum is a discriminating variable in both searches, with the contact interaction search additionally utilizing the dilepton forward-backward asymmetry. No...
Topic: High Energy Physics - Experiment
Source: http://arxiv.org/abs/1407.2410
4
4.0
Jun 30, 2018
06/18
by
CMS Collaboration
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eye 4
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A search for physics beyond the standard model in events with at least three leptons is presented. The data sample, corresponding to an integrated luminosity of 19.5 inverse femtobarns of proton-proton collisions with center-of-mass energy sqrt(s) = 8 TeV, was collected by the CMS experiment at the LHC during 2012. The data are divided into exclusive categories based on the number of leptons and their flavor, the presence or absence of an opposite-sign, same-flavor lepton pair (OSSF), the...
Topic: High Energy Physics - Experiment
Source: http://arxiv.org/abs/1404.5801
5
5.0
Jun 29, 2018
06/18
by
M. Ablikim; M. N. Achasov; X. C. Ai; O. Albayrak; M. Albrecht; D. J. Ambrose; A. Amoroso; F. F. An; Q. An; J. Z. Bai; R. Baldini Ferroli; Z. L. Hou; C. Hu; H. M. Hu; J. F. Hu; T. Hu; Y. Hu; G. S. Huang; J. S. Huang; X. T. Huang; X. Z. Huang; Y. Ban; Y. Huang; Z. L. Huang; T. Hussain; Q. Ji; Q. P. Ji; X. B. Ji; X. L. Ji; L. W. Jiang; X. S. Jiang; X. Y. Jiang; D. W. Bennett; J. B. Jiao; Z. Jiao; D. P. Jin; S. Jin; T. Johansson; A. Julin; N. Kalantar-Nayestanaki; X. L. Kang; X. S. Kang; M....
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eye 5
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A search for radiative decays of the $P$-wave spin singlet charmonium resonance $h_c$ is performed based on $4.48 \times 10^{8}$ $\psi'$ events collected with the BESIII detector operating at the BEPCII storage ring. Events of the reaction channels $h_{c} \rightarrow \gamma \eta'$ and $\gamma \eta$ are observed with a statistical significance of $8.4 \sigma$ and $4.0 \sigma$, respectively, for the first time. The branching fractions of $h_{c} \rightarrow \gamma \eta'$ and $h_{c} \rightarrow...
Topic: High Energy Physics - Experiment
Source: http://arxiv.org/abs/1603.04936
4
4.0
Jun 29, 2018
06/18
by
Pedro Ferreira da Silva; for the ATLAS Collaboration; for the CMS Collaboration
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Twenty years past its discovery, the top quark continues attracting great interest as experiments keep unveiling its properties. An overview of the latest measurements in the domain of top quark production, performed by the ATLAS and CMS experiments at the CERN LHC, is given. The latest measurements of top quark production rates via strong and electroweak processes are reported and compared to different perturbative QCD predictions. Fundamental properties, such as the mass or the couplings of...
Topic: High Energy Physics - Experiment
Source: http://arxiv.org/abs/1605.05343
5
5.0
Jun 29, 2018
06/18
by
ATLAS Collaboration
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eye 5
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This Letter presents a measurement of the inelastic proton-proton cross section using 60 $\mu$b$^{-1}$ of $pp$ collisions at a center-of-mass energy $\sqrt{s}$ of $13$ TeV with the ATLAS detector at the LHC. Inelastic interactions are selected using rings of plastic scintillators in the forward region ($2.07 13$ GeV. The measured cross section is compared with a range of theoretical predictions. When extrapolated to the full phase space, a cross-section of $78.1 \pm 2.9$ mb is measured,...
Topic: High Energy Physics - Experiment
Source: http://arxiv.org/abs/1606.02625
3
3.0
Jun 29, 2018
06/18
by
ATLAS; CMS Collaborations
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Combined ATLAS and CMS measurements of the Higgs boson production and decay rates, as well as constraints on its couplings to vector bosons and fermions, are presented. The combination is based on the analysis of five production processes, namely gluon fusion, vector boson fusion, and associated production with a $W$ or a $Z$ boson or a pair of top quarks, and of the six decay modes $H \to ZZ, WW$, $\gamma\gamma, \tau\tau, bb$, and $\mu\mu$. All results are reported assuming a value of 125.09...
Topic: High Energy Physics - Experiment
Source: http://arxiv.org/abs/1606.02266
4
4.0
Jun 29, 2018
06/18
by
CMS Collaboration
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eye 4
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The decay B+ to psi(2S) phi(1020) K+ is observed for the first time using data collected from pp collisions at sqrt(s) = 8 TeV by the CMS experiment at the LHC, corresponding to an integrated luminosity of 19.6 inverse femtobarns. The branching fraction of this decay is measured, using the mode B+ to psi(2S) K+ as normalization, to be (4.0 +/- 0.4 (stat) +/- 0.6 (syst) +/- 0.2 (B)) x E-6, where the third uncertainty is from the measured branching fraction of the normalization channel.
Topic: High Energy Physics - Experiment
Source: http://arxiv.org/abs/1607.02638
4
4.0
Jun 29, 2018
06/18
by
ATLAS Collaboration
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eye 4
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Knowledge of the material in the ATLAS inner tracking detector is crucial in understanding the reconstruction of charged-particle tracks, the performance of algorithms that identify jets containing b-hadrons and is also essential to reduce background in searches for exotic particles that can decay within the inner detector volume. Interactions of primary hadrons produced in pp collisions with the material in the inner detector are used to map the location and amount of this material. The...
Topic: High Energy Physics - Experiment
Source: http://arxiv.org/abs/1609.04305
3
3.0
Jun 29, 2018
06/18
by
Tai Sakuma; for the CMS Collaboration
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These proceedings summarize the results of four analyses which searched for squarks and gluinos in hadronic final states with missing transverse momentum in 2.3 fb$^{-1}$ of data in proton-proton collisions at $\sqrt{s}=13$ TeV collected in the year 2015 with the CMS detector at the CERN LHC. Each analysis is characterized by a different kinematic variable that is sensitive to the presence of invisible particles, e.g., $M_\text{T2}$, $\alpha_{\text{T}}$, and razor variables. We observed no...
Topic: High Energy Physics - Experiment
Source: http://arxiv.org/abs/1609.07445
4
4.0
Jun 29, 2018
06/18
by
ATLAS Collaboration
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This paper describes the algorithms for the reconstruction and identification of electrons in the central region of the ATLAS detector at the Large Hadron Collider (LHC). These algorithms were used for all ATLAS results with electrons in the final state that are based on the 2012 pp collision data produced by the LHC at $\sqrt{\mathrm{s}}$ = 8 TeV. The efficiency of these algorithms, together with the charge misidentification rate, is measured in data and evaluated in simulated samples using...
Topic: High Energy Physics - Experiment
Source: http://arxiv.org/abs/1612.01456
4
4.0
Jun 30, 2018
06/18
by
Michael James Fenton
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Differential cross-section measurements of highly boosted top quarks are presented. The dataset used has an integrated luminosity of $3.2$ fb$^{-1}$, recorded at a centre-of-mass energy of $\sqrt{s}=13$ TeV with the ATLAS detector at the CERN Large Hadron Collider in 2015. Events are selected in the lepton + jets channel, containing one isolated lepton and a large radius jet that is identified as originating from a top quark using substructure tagging techniques. The measured transverse...
Topic: High Energy Physics - Experiment
Source: http://arxiv.org/abs/1702.08728
4
4.0
Jun 29, 2018
06/18
by
Daniel O'Hanlon; for the LHCb collaboration
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The physics potential for $b$-baryon decays has been relatively unexplored until the advent of the LHC, and as such important questions still exist about their fundamental properties, such as whether their decays exhibit $C\!P$ violation. Presented here are observations of the decays $\Lambda_b^0 \rightarrow \Lambda K^+\pi^-$ and $\Lambda_b^0 \rightarrow \Lambda K^+K^-$, made at a significance level of 8.1 and 15.8 Gaussian standard deviations, respectively, and measurements of their branching...
Topic: High Energy Physics - Experiment
Source: http://arxiv.org/abs/1605.06990
4
4.0
Jun 29, 2018
06/18
by
ATLAS Collaboration
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eye 4
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The production of $W^{\pm}Z$ events in proton--proton collisions at a centre-of-mass energy of 13 TeV is measured with the ATLAS detector at the LHC. The collected data correspond to an integrated luminosity of 3.2 fb$^{-1}$. The $W^{\pm}Z$ candidates are reconstructed using leptonic decays of the gauge bosons into electrons or muons. The measured inclusive cross section in the detector fiducial region for leptonic decay modes is $\sigma_{W^\pm Z \rightarrow \ell^{'} \nu \ell...
Topic: High Energy Physics - Experiment
Source: http://arxiv.org/abs/1606.04017
4
4.0
Jun 29, 2018
06/18
by
ATLAS Collaboration
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eye 4
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The performance of the jet trigger for the ATLAS detector at the LHC during the 2011 data taking period is described. During 2011 the LHC provided proton-proton collisions with a centre-of-mass energy of 7 TeV and heavy ion collisions with a 2.76 TeV per nucleon-nucleon collision energy. The ATLAS trigger is a three level system designed to reduce the rate of events from the 40 MHz nominal maximum bunch crossing rate to the approximate 400 Hz which can be written to offline storage. The ATLAS...
Topic: High Energy Physics - Experiment
Source: http://arxiv.org/abs/1606.07759
4
4.0
Jun 29, 2018
06/18
by
ATLAS Collaboration
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eye 4
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A search has been made for supersymmetry in a final state containing two photons and missing transverse momentum using the ATLAS detector at the Large Hadron Collider. The search makes use of 3.2 fb$^{-1}$ of proton-proton collision data collected at a centre-of-mass energy of 13 TeV in 2015. Using a combination of data-driven and Monte-Carlo-based approaches, the Standard Model background is estimated to be $0.27^{+0.22}_{-0.10}$ events. No events are observed in the signal region; considering...
Topic: High Energy Physics - Experiment
Source: http://arxiv.org/abs/1606.09150
6
6.0
Jun 29, 2018
06/18
by
M. Ablikim; M. N. Achasov; X. C. Ai; O. Albayrak; M. Albrecht; D. J. Ambrose; A. Amoroso; F. F. An; Q. An; J. Z. Bai; R. Baldini Ferroli; J. F. Hu; T. Hu; Y. Hu; G. M. Huang; G. S. Huang; J. S. Huang; X. T. Huang; Y. Huang; T. Hussain; Q. Ji; Y. Ban; Q. P. Ji; X. B. Ji; X. L. Ji; L. W. Jiang; X. S. Jiang; X. Y. Jiang; J. B. Jiao; Z. Jiao; D. P. Jin; S. Jin; D. W. Bennett; T. Johansson; A. Julin; N. Kalantar-Nayestanaki; X. L. Kang; X. S. Kang; M. Kavatsyuk; B. C. Ke; P. Kiese; R. Kliemt; B....
texts
eye 6
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We present the first study of the process $J/\psi \rightarrow \gamma\eta\pi^{0}$ using $(223.7\pm1.4)\times10^{6}$ $J/\psi$ events accumulated with the BESIII detector at the BEPCII facility. The branching fraction for $J/\psi \rightarrow \gamma\eta\pi^{0}$ is measured to be $\mathcal{B}(J/\psi \rightarrow \gamma\eta\pi^{0}) =(2.14\pm0.18(stat)\pm0.25(syst))\times10^{-5}$. With a Bayesian approach, the upper limits of the branching fractions $\mathcal{B}(J/\psi \rightarrow \gamma...
Topic: High Energy Physics - Experiment
Source: http://arxiv.org/abs/1608.07393
7
7.0
Jun 30, 2018
06/18
by
BESIII Collaboration; M. Ablikim; M. N. Achasov; S. Ahmed; X. C. Ai; O. Albayrak; M. Albrecht; D. J. Ambrose; A. Amoroso; F. F. An; Q. An; T. Held; Y. K. Heng; T. Holtmann; Z. L. Hou; C. Hu; H. M. Hu; T. Hu; Y. Hu; G. S. Huang; J. S. Huang; J. Z. Bai; X. T. Huang; X. Z. Huang; Z. L. Huang; T. Hussain; W. Ikegami Andersson; Q. Ji; Q. P. Ji; X. B. Ji; X. L. Ji; L. W. Jiang; O. Bakina; X. S. Jiang; X. Y. Jiang; J. B. Jiao; Z. Jiao; D. P. Jin; S. Jin; T. Johansson; A. Julin; N....
texts
eye 7
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Using $1310.6\times10^6$ $J/\psi$ and $447.9\times10^6$ $\psi(3686)$ events collected with the BESIII detector at the BEPCII $e^{+}e^{-}$ collider, the branching fractions and the angular distributions of $J/\psi$ and $\psi(3686)$ decays to $\Lambda\bar{\Lambda}$ and $\Sigma^0\bar{\Sigma}^0$ final states are measured. The branching fractions are in agreement with, and much more precise than, the averages of previously published results. The polar angular distributions of $\psi(3686)$ decays are...
Topic: High Energy Physics - Experiment
Source: http://arxiv.org/abs/1701.07191
6
6.0
Jun 30, 2018
06/18
by
A. Descroix for the CMS Collaboration
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eye 6
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The normalised differential top quark-antiquark production cross section is measured as a function of the jet multiplicity. Using a procedure to associate jets to decay products of the top quarks, the differential cross section of the ttbar production is determined as a function of the additional jet multiplicity. The fraction of events with no additional jets is measured as a function of the threshold required for the transverse momentum of the additional jet. The measurements are compared...
Topic: High Energy Physics - Experiment
Source: http://arxiv.org/abs/1411.2764
5
5.0
Jun 30, 2018
06/18
by
Jacopo Pazzini; for the CMS collaboration
texts
eye 5
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The CP-violating weak phase $\phi_\mathrm{s}$ and the decay width difference $\Delta\Gamma_{\mathrm{s}}$ of $\mathrm{B}^{0}_{\mathrm{s}}$ mesons are measured by the CMS experiment at the LHC using a data sample of $\mathrm{B}^{0}_{\mathrm{s}} \! \to \mathrm{J} / \psi\,\phi$ decays. The analysed dataset corresponds to an integrated luminosity of about $20~\mathrm{fb}^{-1}$ collected in $pp$ collisions at a centre-of-mass energy $\sqrt{s} = 8~\mathrm{TeV}$. A total of $49\,000$ reconstructed...
Topic: High Energy Physics - Experiment
Source: http://arxiv.org/abs/1411.3560
4
4.0
Jun 30, 2018
06/18
by
Fabian Krinner; for the COMPASS collaboration
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eye 4
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Quantum Chromodynamics (QCD), the theory of strong interactions, in principle describes the interaction of quark and gluon fields. However, due to the self-coupling of the gluons, quarks and gluons are confined into hadrons and cannot exist as free particles. The quantitative understanding of this confinement phenomenon, which is responsible for about 98\% of the mass of the visible universe, is one of the major open questions in particle physics. The measurement of the excitation spectrum of...
Topic: High Energy Physics - Experiment
Source: http://arxiv.org/abs/1412.2594
5
5.0
Jun 30, 2018
06/18
by
D0 Collaboration
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eye 5
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We present a measurement of the electron charge asymmetry in $p\bar{p}\rightarrow W+X \rightarrow e\nu +X$ events at a center-of-mass energy of 1.96 TeV, using data corresponding to 9.7~fb$^{-1}$ of integrated luminosity collected with the D0 detector at the Fermilab Tevatron Collider. The asymmetry is measured as a function of the electron pseudorapidity and is presented in five kinematic bins based on the electron transverse energy and the missing transverse energy in the event. The measured...
Topic: High Energy Physics - Experiment
Source: http://arxiv.org/abs/1412.2862
5
5.0
Jun 30, 2018
06/18
by
Benjamin Stieger
texts
eye 5
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We present exploratory studies of the underlying event activity and of fragmentation and hadronization of b quarks using $t\overline{t}$ candidate events in proton-proton collision data acquired by the CMS experiment. We reconstruct charm mesons in fully charged decay channels from the reconstructed tracks associated with the hadronization of b quarks from the top decay, and study their kinematics relative to the mother jet. A good agreement is found using MadGraph plus the Pythia 6 Tune Z2*...
Topic: High Energy Physics - Experiment
Source: http://arxiv.org/abs/1412.4047
4
4.0
Jun 30, 2018
06/18
by
G. Milutinović-Dumbelović; I. Božović-Jelisavčić; C. Grefe; S. Lukić; M. Pandurović; P. Roloff
texts
eye 4
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The potential for the measurement of the branching ratio of the Standard Model-like Higgs boson decay into a mu+mu- pair at 1.4 TeV CLIC is analysed. The study is performed using the fully simulated CLIC_ILD detector concept, taking into consideration all the relevant physics and the beam-induced backgrounds. Despite the very low branching ratio of the H->mu+mu- decay, we show that the product of the branching ratio times the Higgs production cross section can be measured with a statistical...
Topic: High Energy Physics - Experiment
Source: http://arxiv.org/abs/1412.5791
3
3.0
Jun 30, 2018
06/18
by
ATLAS Collaboration
texts
eye 3
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This paper describes the trigger and offline reconstruction, identification and energy calibration algorithms for hadronic decays of tau leptons employed for the data collected from $pp$ collisions in 2012 with the ATLAS detector at the LHC center-of-mass energy $\sqrt{\mathrm{s}} = 8$ TeV. The performance of these algorithms is measured in most cases with $Z$ decays to tau leptons using the full 2012 dataset, corresponding to an integrated luminosity of 20.3 fb$^{-1}$. An uncertainty on the...
Topic: High Energy Physics - Experiment
Source: http://arxiv.org/abs/1412.7086
3
3.0
Jun 30, 2018
06/18
by
Chang-Seong Moon
texts
eye 3
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We present the most recent measurements of top quark pairs production and top quark properties in proton-antiproton collisions with center-of-mass energy of 1.96 TeV using CDF II detector at the Tevatron. The combination of top pair production cross section measurements and the direct measurement of top quark width are reported. The test of Standard Model predictions for top quark decaying into $b$-quarks, performed by measuring the ratio $R$ between the top quark branching fraction to...
Topic: High Energy Physics - Experiment
Source: http://arxiv.org/abs/1411.0063
3
3.0
Jun 30, 2018
06/18
by
Elisabetta Prencipe
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eye 3
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One of the most intriguing puzzles in hadron spectroscopy are the numerous charmonium-like states observed in the last decade, including charged states that are manifestly exotic. The $BABAR$ experiment has extensively studied those in B meson decays, initial state radiation processes and two photon reactions. The study of the process $B \rightarrow J/\psi \phi K$, with a search for the resonant states X(4140) and X(4270) in their decays to $J/\psi \phi$, will be highlighted. The recent results...
Topic: High Energy Physics - Experiment
Source: http://arxiv.org/abs/1411.0571
9
9.0
Jun 30, 2018
06/18
by
The BABAR Collaboration; J. P. Lees; others
texts
eye 9
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We report on a search in $e^+e^-$ annihilations for new $\pi^0$-like particles produced in association with a $\tau$-lepton pair. These objects, with a similar mass and similar decay modes to $\pi^0$ mesons, could provide an explanation for the non-asymptotic behavior of the pion-photon transition form factor observed by the Babar Collaboration. No significant signal is observed, and limits on the production cross section at the level of 73 fb or 370 fb, depending on the model parameters, are...
Topic: High Energy Physics - Experiment
Source: http://arxiv.org/abs/1411.1806
4
4.0
Jun 30, 2018
06/18
by
Patrick Koppenburg
texts
eye 4
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In absence of direct signs of new physics at the LHC, flavour physics provides an ideal laboratory to look for deviations from the Standard Model and explore an energy regime beyond the LHC reach. Here, new results in CP violation and rare decays are presented.
Topic: High Energy Physics - Experiment
Source: http://arxiv.org/abs/1411.5119
10
10.0
Jun 27, 2018
06/18
by
Shusuke Takada; Hiroto Hirai; Kiyotomo Kawagoe; Yohei Miyazaki; Yuji Sudo; Taikan Suehara; Hiroki Sumida; Tatsuhiko Tomita; Hiraku Ueno; Tamaki Yoshioka
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eye 10
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Excellent jet energy measurement is important at the International Linear Collider (ILC) because most of interesting physics processes decay into multi-jet final states. We employ a particle flow method to reconstruct particles, hence International Large Detector (ILD) needs high spatial resolution which can separate each particle in jets. We study pixelized silicon sensors as active material of ILD Silicon electro- magnetic calorimeter (SiECAL). This paper reports studies of temperature and...
Topic: High Energy Physics - Experiment
Source: http://arxiv.org/abs/1503.09050
5
5.0
Jun 28, 2018
06/18
by
Gerald Eigen; for the BABAR collaboration
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Using $471 \times 10^6 ~B \bar B$ decays recorded with the \babar\ detector at the PEP-II $e^+ e^-$ storage ring, we present the time-dependent \CP\ asymmetry measurement in the radiative penguin decay mode $B^0 \rightarrow K^0_S \rho(770)^0 \gamma$, yielding $S_{K^0_S \rho^0 \gamma} =-0.17\pm 0.32^{+0.07}_{-0.06}$. Since the result is extracted from the time-dependent \CP~asymmetry parameters $S_{K^0_S \pi^+ \pi^- \gamma} =0.14\pm 0.25^{+0.04}_{-0.03}$ and $C _{K^0_S \pi^+ \pi^- \gamma}...
Topic: High Energy Physics - Experiment
Source: http://arxiv.org/abs/1510.04446
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11
Jun 26, 2018
06/18
by
Jeremy Wolcott; for the MINERvA collaboration
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Among the most important tasks of neutrino oscillation experiments is correctly estimating the parent neutrino energy from the by-products of their interactions. Large uncertainties in our current understanding of such processes can significantly hamper this effort. We explore several recent measurements made using the \mnv{} detector in the few-GeV NuMI muon neutrino beam at Fermilab: the differential cross-section vs. $Q^2$ for charged-current quasi-elastic scattering, the differential...
Topic: High Energy Physics - Experiment
Source: http://arxiv.org/abs/1501.05210
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21
Jun 27, 2018
06/18
by
M. Ablikim; M. N. Achasov; X. C. Ai; O. Albayrak; M. Albrecht; D. J. Ambrose; A. Amoroso; F. F. An; Q. An; J. Z. Bai; R. Baldini Ferroli; H. M. Hu; J. F. Hu; T. Hu; Y. Hu; G. M. Huang; G. S. Huang; H. P. Huang; J. S. Huang; X. T. Huang; Y. Huang; Y. Ban; T. Hussain; Q. Ji; Q. P. Ji; X. B. Ji; X. L. Ji; L. L. Jiang; L. W. Jiang; X. S. Jiang; J. B. Jiao; Z. Jiao; D. W. Bennett; D. P. Jin; S. Jin; T. Johansson; A. Julin; N. Kalantar-Nayestanaki; X. L. Kang; X. S. Kang; M. Kavatsyuk; B. C. Ke; R....
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We report the first observation of the Dalitz decay $\eta' \to \gamma e^+e^-$, based on a data sample of 1.31 billion $J/\psi$ events collected with the BESIII detector. The $\eta'$ mesons are produced via the $J/\psi \to \gamma \eta'$ decay process. The ratio $\Gamma(\eta' \to \gamma e^+ e^-)/\Gamma(\eta'\to\gamma\gamma)$ is measured to be $(2.13\pm0.09(\text{stat.})\pm0.07(\text{sys.}))\times10^{-2}$. This corresponds to a branching fraction ${\cal B}(\eta' \to \gamma e^+e^-)= (4.69...
Topic: High Energy Physics - Experiment
Source: http://arxiv.org/abs/1504.06016
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23
Jun 27, 2018
06/18
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A. Adare; C. Aidala; N. N. Ajitanand; Y. Akiba; R. Akimoto; J. Alexander; M. Alfred; K. Aoki; N. Apadula; Y. Aramaki; H. Asano; T. Fusayasu; K. Gainey; C. Gal; P. Gallus; P. Garg; A. Garishvili; I. Garishvili; H. Ge; F. Giordano; A. Glenn; E. C. Aschenauer; X. Gong; M. Gonin; Y. Goto; R. Granier de Cassagnac; N. Grau; S. V. Greene; M. Grosse Perdekamp; Y. Gu; T. Gunji; H. Guragain; E. T. Atomssa; T. Hachiya; J. S. Haggerty; K. I. Hahn; H. Hamagaki; H. F. Hamilton; S. Y. Han; J. Hanks; S....
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We present measurements from the PHENIX experiment of large parity-violating single spin asymmetries of high transverse momentum electrons and positrons from $W^\pm/Z$ decays, produced in longitudinally polarized $p$$+$$p$ collisions at center of mass energies of $\sqrt{s}$=500 and 510~GeV. These asymmetries allow direct access to the anti-quark polarized parton distribution functions due to the parity-violating nature of the $W$-boson coupling to quarks and anti-quarks. The results presented...
Topic: High Energy Physics - Experiment
Source: http://arxiv.org/abs/1504.07451
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16
Jun 27, 2018
06/18
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LHCb collaboration; R. Aaij; B. Adeva; M. Adinolfi; A. Affolder; Z. Ajaltouni; S. Akar; J. Albrecht; F. Alessio; M. Alexander; S. Ali; L. Cassina; L. Castillo Garcia; M. Cattaneo; Ch. Cauet; G. Cavallero; R. Cenci; M. Charles; Ph. Charpentier; M. Chefdeville; S. Chen; G. Alkhazov; S. -F. Cheung; N. Chiapolini; M. Chrzaszcz; X. Cid Vidal; G. Ciezarek; P. E. L. Clarke; M. Clemencic; H. V. Cliff; J. Closier; V. Coco; P. Alvarez Cartelle; J. Cogan; E. Cogneras; V. Cogoni; L. Cojocariu; G....
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A search for $B_s^0 \to \overline{D}^{0} f_{0}(980)$ decays is performed using $3.0\, {\rm fb}^{-1}$ of $pp$ collision data recorded by the LHCb experiment during 2011 and 2012. The $f_{0}(980)$ meson is reconstructed through its decay to the $\pi^{+}\pi^{-}$ final state in the mass window $900\, {\rm MeV}/c^{2} < m(\pi^{+}\pi^{-}) < 1080\, {\rm MeV}/c^{2}$. No significant signal is observed. The first upper limits on the branching fraction of $\mathcal{B}(B_s^0 \to \overline{D}^{0}...
Topic: High Energy Physics - Experiment
Source: http://arxiv.org/abs/1505.01654
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4.0
Jun 28, 2018
06/18
by
CMS Collaboration
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A search for narrow resonances in proton-proton collisions at sqrt(s) = 13 TeV is presented. The invariant mass distribution of the two leading jets is measured with the CMS detector using a data set corresponding to an integrated luminosity of 2.4 inverse femtobarns. The highest observed dijet mass is 6.1 TeV. The distribution is smooth and no evidence for resonant particles is observed. Upper limits at 95% confidence level are set on the production cross section for narrow resonances with...
Topic: High Energy Physics - Experiment
Source: http://arxiv.org/abs/1512.01224
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3.0
Jun 29, 2018
06/18
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ZEUS Collaboration; H. Abramowicz; I. Abt; L. Adamczyk; M. Adamus; S. Antonelli; V. Aushev; Y. Aushev; O. Behnke; U. Behrens; A. Bertolin; P. Roloff; I. Rubinsky; M. Ruspa; D. H. Saxon; M. Schioppa; W. B. Schmidke; U. Schneekloth; T. Schörner-Sadenius; L. M. Shcheglova; R. Shevchenko; I. Bloch; O. Shkola; Yu. Shyrma; I. Singh; I. O. Skillicorn; W. Słomiński; A. Solano; L. Stanco; N. Stefaniuk; A. Stern; P. Stopa; E. G. Boos; J. Sztuk-Dambietz; D. Szuba; J. Szuba; E. Tassi; K. Tokushuku; J....
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The exclusive deep inelastic electroproduction of $\psi(2S)$ and $J/\psi(1S)$ at an $ep$ centre-of-mass energy of 317 GeV has been studied with the ZEUS detector at HERA in the kinematic range $2 < Q^2 < 80$ GeV$^2$, $30 < W < 210$ GeV and $|t| < 1$ GeV$^2$, where $Q^2$ is the photon virtuality, $W$ is the photon-proton centre-of-mass energy and $t$ is the squared four-momentum transfer at the proton vertex. The data for $2 < Q^2 < 5$ GeV$^2$ were taken in the HERA I...
Topic: High Energy Physics - Experiment
Source: http://arxiv.org/abs/1601.03699
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7.0
Jun 29, 2018
06/18
by
Gabriella Pásztor
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The CERN LHC delivered 25/fb of proton-proton collision data in 2011-2012 at sqrt{s} = 7 - 8 TeV centre-of-mass energy to the ATLAS detector. These Run 1 data were used to discover the Higgs boson and measure its properties as well as to perform numerous other tests of the Standard Model via precision measurements and searches for New Physics. In preparation for the Run 2 data taking at sqrt{s} = 13 TeV, the collaboration embarked on an upgrade program during the long LHC machine shutdown in...
Topic: High Energy Physics - Experiment
Source: http://arxiv.org/abs/1602.01536
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3.0
Jun 28, 2018
06/18
by
J. L. Holzbauer; on behalf of the D0 collaboration
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We discuss W boson and lepton charge asymmetry measurements from W decays in the electron channel, which were made using 9.7 fb$^{-1}$ of RunII data collected by the D0 detector at the Fermilab Tevatron Collider. The electron charge asymmetry is presented as a function of pseudo-rapidity out to |$\eta$| $\le$ 3.2, in five symmetric and asymmetric kinematic bins of electron transverse momentum and the missing transverse energy of the event. We also give the W charge asymmetry as a function of W...
Topic: High Energy Physics - Experiment
Source: http://arxiv.org/abs/1510.01716
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4.0
Jun 28, 2018
06/18
by
Marco Fiore
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We report new measurements, based on the Run I dataset collected by the LHCb experiment, of the B0 mixing frequency Dm_d and the CKM matrix element |V_ub| using semileptonic b decays. The former is the most precise measurement ever performed; the latter represents the first determination of |V_ub| using a baryonic decay, and adds an important constraint on a possible explanation for the discrepancy between exclusive and inclusive determinations of this observable.
Topic: High Energy Physics - Experiment
Source: http://arxiv.org/abs/1511.00105
