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PH-EP Articles

Ultimi arrivi:
2016-04-07
08:52
Measurement of the mass and lifetime of the $\Omega_b^-$ baryon / LHCb collaboration
A proton-proton collision data sample, corresponding to an integrated luminosity of 3 fb$^{-1}$ collected by LHCb at $\sqrt{s}=7$ and 8 TeV, is used to reconstruct $63\pm9$ $\Omega_b^-\to\Omega_c^0\pi^-$, $\Omega_c^0\to pK^-K^-\pi^+$ decays. Using the $\Xi_b^-\to\Xi_c^0\pi^-$, $\Xi_c^0\to pK^-K^-\pi^+$ decay mode for calibration, the lifetime ratio and absolute lifetime of the $\Omega_b^-$ baryon are measured to be \begin{align*} \frac{\tau_{\Omega_b^-}}{\tau_{\Xi_b^-}} &= 1.11\pm0.16\pm0.03, \\ \tau_{\Omega_b^-} &= 1.78\pm0.26\pm0.04\pm0.05~{\rm ps}, \end{align*} where the uncertainties are statistical, systematic and from the calibration mode (for $\tau_{\Omega_b^-}$ only). [...]
arXiv:1604.01412; CERN-EP-2016-081; LHCB-PAPER-2016-008.- Geneva : CERN, 2016 - 21 p. - Published in : Phys. Rev. D 93 (2016) 092007 APS Open Access article: PD; Fulltext: PDF; Related data file(s): ZIP; External link: Preprint

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2016-03-23
17:44
Beam-induced and cosmic-ray backgrounds observed in the ATLAS detector during the LHC 2012 proton-proton running period / ATLAS Collaboration
This paper discusses various observations on beam-induced and cosmic-ray backgrounds in the ATLAS detector during the LHC 2012 proton-proton run. Building on published results based on 2011 data, the correlations between background and residual pressure of the beam vacuum are revisited. [...]
arXiv:1603.09202; CERN-EP-2016-029.- Geneva : CERN, 2016 - 65 p. - Published in : JINST 11 (2016) P05013 Fulltext: PDF; External links: Previous draft version; Preprint

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2016-03-17
17:28
Muon reconstruction performance of the ATLAS detector in proton--proton collision data at $\sqrt{s}$=13 TeV / ATLAS Collaboration
This article documents the performance of the ATLAS muon identification and reconstruction using the first LHC dataset recorded at $\sqrt{s}$ = 13 TeV in 2015. Using a large sample of $J/\psi\to\mu\mu$ and $Z\to\mu\mu$ decays from 3.2 fb$^{-1}$ of $pp$ collision data, measurements of the reconstruction efficiency, as well as of the momentum scale and resolution, are presented and compared to Monte Carlo simulations. [...]
arXiv:1603.05598; CERN-EP-2016-033.- Geneva : CERN, 2016 - 45 p. - Published in : Eur. Phys. J. C 76 (2016) 292 Fulltext: PDF; External links: Previous draft version; Preprint

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2016-03-08
16:18
Observation of $B^0_s\to\bar{D}^0 K^0_S$ and evidence for $B^0_s\to\bar{D}^{*0} K^0_S$ decays / LHCb Collaboration
The first observation of the $B^0_s\to\bar{D}^0 K^0_S$ decay mode and evidence for the $B^0_s\to\bar{D}^{*0} K^0_S$ decay mode are reported. The data sample corresponds to an integrated luminosity of 3.0 $\text{fb}^{-1}$ collected in $pp$ collisions by LHCb at center-of-mass energies of 7 and 8 TeV. [...]
arXiv:1603.02408; LHCB-PAPER-2015-050; CERN-EP-2016-053.- Geneva : CERN, 2016 - 16 p. - Published in : Phys. Rev. Lett. 116 (2016) 161802 Fulltext: PDF; Related data file(s): ZIP; External link: Preprint

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2016-03-07
15:51
Measurements of $W^\pm Z$ production cross sections in $pp$ collisions at $\sqrt{s} = 8$ TeV with the ATLAS detector and limits on anomalous gauge boson self-couplings / ATLAS Collaboration
This paper presents measurements of $W^\pm Z$ production in $pp$ collisions at a center-of-mass energy of 8 TeV. The gauge bosons are reconstructed using their leptonic decay modes into electrons and muons. [...]
arXiv:1603.02151; CERN-EP-2016-017.- Geneva : CERN, 2016 - 38 p. - Published in : Phys. Rev. D 93 (2016) 092004 Fulltext: PDF; External links: Previous draft version; Fulltext

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2016-03-02
11:22
Observations of $\Lambda_b^0 \to \Lambda K^+\pi^-$ and $\Lambda_b^0 \to \Lambda K^+K^-$ decays and searches for other $\Lambda_b^0$ and $\Xi_b^0$ decays to $\Lambda h^+h^{\prime -}$ final states / LHCb collaboration
A search is performed for the charmless three-body decays of the $\Lambda_b^0$ and $\Xi_b^0$ baryons to the final states $\Lambda h^+h^{\prime -}$, where $h^{(\prime)} = \pi$ or $K$. The analysis is based on a data sample, corresponding to an integrated luminosity of $3 \rm fb^{-1}$ of $pp$ collisions, collected by the LHCb experiment. [...]
arXiv:1603.00413; CERN-EP-2016-038; LHCB-PAPER-2016-004.- Geneva : CERN, 2016 - 24 p. - Published in : J. High Energy Phys. 05 (2016) 081 Fulltext: PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP; External link: Preprint

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2016-02-29
17:37
Search for supersymmetry at $\sqrt{s}=13$ TeV in final states with jets and two same-sign leptons or three leptons with the ATLAS detector / ATLAS Collaboration
A search for strongly produced supersymmetric particles is conducted using signatures involving multiple energetic jets and either two isolated leptons ($e$ or $\mu$) with the same electric charge or at least three isolated leptons. The search also utilises $b$-tagged jets, missing transverse momentum and other observables to extend its sensitivity. [...]
arXiv:1602.09058; CERN-EP-2016-027.- Geneva : CERN, 2016 - 20 p. - Published in : Eur. Phys. J C 76 (2016) 259 Fulltext: PDF; External links: Previous draft version; Fulltext

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2016-02-25
08:58
Measurement of the $B_{s}^{0} \rightarrow D_{s}^{(*)+}D_{s}^{(*)-}$ branching fractions / LHCb collaboration
The branching fraction of the decay $B_{s}^{0} \rightarrow D_{s}^{(*)+}D_{s}^{(*)-}$ is measured using $pp$ collision data corresponding to an integrated luminosity of $1.0fb^{-1}$, collected using the LHCb detector at a centre-of-mass energy of $7$TeV. It is found to be \begin{align*} {\mathcal{B}}(B_{s}^{0}\rightarrow~D_{s}^{(*)+}D_{s}^{(*)-}) = (3.05 \pm 0.10 \pm 0.20 \pm 0.34)\%, \end{align*} where the uncertainties are statistical, systematic, and due to the normalisation channel, respectively. [...]
arXiv:1602.07543; CERN-EP-2016-028; LHCB-PAPER-2015-053.- Geneva : CERN, 2016 - 20 p. - Published in : Phys. Rev. D 93 (2016) 092008 Fulltext: PDF; Related data file(s): ZIP; External link: Preprint

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2016-02-10
12:29
Measurement of the difference of time-integrated CP asymmetries in $D^0 \rightarrow K^{-} K^{+} $ and $D^0 \rightarrow \pi^{-} \pi^{+} $ decays / LHCb Collaboration
A search for CP violation in $D^0 \rightarrow K^{-} K^{+} $ and $D^0 \rightarrow \pi^{-} \pi^{+} $ decays is performed using $pp$ collision data, corresponding to an integrated luminosity of $3~fb^{-1}$, collected using the LHCb detector at centre-of-mass energies of 7 and 8$~$TeV. The flavour of the charm meson is inferred from the charge of the pion in $D^{*+}\rightarrow D^0\pi^+$ and $D^{*-}\rightarrow \bar{D^0}\pi^{-}$ decays. [...]
arXiv:1602.03160; LHCB-PAPER-2015-055; CERN-EP-2016-022.- Geneva : CERN, 2016 - Published in : Phys. Rev. Lett. 116 (2016) 191601 Fulltext: PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP; External link: Preprint

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2016-01-30
07:43
Production of K$^{*}$(892)$^{0}$ and $\phi$(1020) in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV / ALICE Collaboration
The production of K$^{*}$(892)$^{0}$ and $\phi$(1020) mesons has been measured in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV. K$^{*0}$ and $\phi$ are reconstructed via their decay into charged hadrons with the ALICE detector in the rapidity range $-0.5 < y <0$. [...]
arXiv:1601.07868; CERN-PH-EP-2015-326.- Geneva : CERN, 2016 - 31 p. - Published in : Eur. Phys. J. C 76 (2016) 245 Fulltext: PDF; External link: Preprint

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