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PH-EP Articles

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2014-05-30
05:59
Precision measurement of the mass and lifetime of the $\Xi_b^0$ baryon / LHCb collaboration
Using a proton-proton collision data sample corresponding to an integrated luminosity of 3 fb$^{-1}$ collected by LHCb at center-of-mass energies of 7 and 8 TeV, about 3800 $\Xi_b^0\to\Xi_c^+\pi^-$, $\Xi_c^+\to pK^-\pi^+$ signal decays are reconstructed. From this sample, the first measurement of the $\Xi_b^0$ baryon lifetime is made, relative to that of the $\Lambda_b^0$ baryon. [...]
arXiv:1405.7223; LHCB-PAPER-2014-021; CERN-PH-EP-2014-107.- Geneva : CERN, 2014 - 7 p. - Published in : Phys. Rev. Lett. 113 (2014) 032001 APS Open Access article: PDF; Fulltext: PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP.ZIP; External link: Preprint

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2014-03-28
16:24
Measurement of the t-channel single-top-quark production cross section and of the |$V_{tb}$| CKM matrix element in pp collisions at $\sqrt{s}$ = 8 TeV / CMS Collaboration
Measurements are presented of the t-channel single-top-quark production cross section in proton-proton collisions at $\sqrt{s}$ = 8 TeV. The results are based on a data sample corresponding to an integrated luminosity of 19.7 inverse-femtobarns recorded with the CMS detector at the LHC. [...]
arXiv:1403.7366; CMS-TOP-12-038.- Geneva : CERN, 2014 - 41 p. - Published in : J. High Energy Phys. 06 (2014) 090 Springer Open Access article: PDF; External link: Fulltext

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2014-03-13
11:02
Measurement of polarization amplitudes and $CP$ asymmetries in $B^0 \to \phi K^*(892)^0$ / LHCb collaboration
An angular analysis of the decay $B^0 \to \phi K^*(892)^0$ is reported based on a $pp$ collision data sample, corresponding to an integrated luminosity of 1.0 fb$^{-1}$, collected at a centre-of-mass energy of $\sqrt{s} = 7$ TeV with the LHCb detector. The P-wave amplitudes and phases are measured with a greater precision than by previous experiments, and confirm about equal amounts of longitudinal and transverse polarization. [...]
arXiv:1403.2888; CERN-PH-EP-2014-038; LHCB-PAPER-2014-005.- Geneva : CERN, 2014 - 26 p. - Published in : J. High Energy Phys. 05 (2014) 069 Related data file(s): ZIP; Related supplementary data file(s): ZIP; Springer Open Access article: PDF; External link: Preprint

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2014-03-10
19:53
Alignment of the CMS tracker with LHC and cosmic ray data / CMS Collaboration
The central component of the CMS detector is the largest silicon tracker ever built. The precise alignment of this complex device is a formidable challenge, and only achievable with a significant extension of the technologies routinely used for tracking detectors in the past. [...]
arXiv:1403.2286; CMS-TRK-11-002; CERN-PH-EP-2014-028.- Geneva : CERN, 2014 - 56. - Published in : J. Instrum. 9 (2014) P06009 IOP Open Access article: PDF; External link: Preprint

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2014-03-07
04:27
Measurement of $\psi(2S)$ polarisation in $pp$ collisions at $\sqrt{s}=7$ TeV / LHCb collaboration
The polarisation of prompt $\psi(2S)$ mesons is measured by performing an angular analysis of $\psi(2S)\rightarrow \mu^{+} \mu^{-}$ decays using proton-proton collision data, corresponding to an integrated luminosity of 1.0 fb$^{-1}$, collected by the LHCb detector at a centre-of-mass energy of 7 TeV. The polarisation is measured in bins of transverse momentum $p_\mathrm{T}$ and rapidity $y$ in the kinematic region $3.5<p_\mathrm{T}<15$ GeV$/c$ and $2.0<y<4.5$, and is compared to theoretical models. [...]
arXiv:1403.1339; CERN-PH-EP-2014-029; LHCB-PAPER-2013-067.- Geneva : CERN, 2014 - 22 p. - Published in : Eur. Phys. J. C 74 (2014) 2872 Related data file(s): ZIP; Springer Open Access article: PDF; External link: Preprint

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2014-02-28
04:27
Observation of photon polarization in the $b \to s\gamma$ transition / LHCb collaboration
This Letter presents a study of the flavor-changing neutral current radiative $B^{\pm} \to K^{\pm}\pi^{\mp}\pi^{\pm}\gamma$ decays performed using data collected in proton-proton collisions with the LHCb detector at $7$ and $8\,$TeV center-of-mass energies. In this sample, corresponding to an integrated luminosity of $3\,\text{fb}^{-1}$, nearly $14\,000$ signal events are reconstructed and selected, containing all possible intermediate resonances with a $K^{\pm}\pi^{\mp}\pi^{\pm}$ final state in the $[1.1, 1.9]\,$GeV/$c^{2}$ mass range. [...]
arXiv:1402.6852; CERN-PH-EP-2014-026; LHCB-PAPER-2014-001.- Geneva : CERN, 2014 - 17 p. - Published in : Phys. Rev. Lett. 112 (2014) 161801 APS published version, local copy: PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP; External link: Preprint

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2014-02-27
18:18
Search for direct production of charginos and neutralinos in events with three leptons and missing transverse momentum in $\sqrt{s}$ = 8 TeV $pp$ collisions with the ATLAS detector / ATLAS Collaboration
A search for the direct production of charginos and neutralinos in final states with three leptons and missing transverse momentum is presented. The analysis is based on 20.3 fb$^{−1}$ of $\sqrt{s}$ = 8 TeV proton-proton collision data delivered by the Large Hadron Collider and recorded with the ATLAS detector. [...]
arXiv:1402.7029; CERN-PH-EP-2014-019.- Geneva : CERN, 2014 - 29 p. - Published in : J. High Energy Phys. 04 (2014) 169 Springer Open Access article : PDF; External links: Previous draft version; Preprint

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2014-02-26
16:23
Measurement of resonant and $CP$ components in $\overline{B}_s^0\to J/\psi\pi^+\pi^-$ decays / LHCb Collaboration
The resonant structure of the decay $\overline{B}_s^0\to J/\psi\pi^+\pi^-$ is studied using data corresponding to 3 fb$^{-1}$ of integrated luminosity from $pp$ collisions by the LHC and collected by the LHCb detector. Five interfering $\pi^+\pi^-$ states are required to describe the decay: $f_0(980),~f_0(1500),~f_0(1790),~f_2(1270)$, and $f_2^{\prime}(1525)$. [...]
arXiv:1402.6248; LHCB-PAPER-2013-069; CERN-PH-EP-2014-024.- Geneva : CERN, 2014 - 31 p. - Published in : Phys. Rev. D 89 (2014) 092006 APS published version, local copy: PDF; Related data file(s): ZIP; External link: Preprint

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2014-02-20
04:14
Search for new physics in the multijet and missing transverse momentum final state in proton-proton collisions at $\sqrt{s}$ = 8 TeV / CMS Collaboration
A search for new physics is performed in multijet events with large missing transverse momentum produced in proton-proton collisions at $\sqrt{s}$=8 TeV using a data sample corresponding to an integrated luminosity of 19.5 inverse-femtobarns collected with the CMS detector at the LHC. The data sample is divided into three jet multiplicity categories (3-5, 6-7, and $\ge$ 8 jets), and studied further in bins of two variables: the scalar sum of jet transverse momenta and the missing transverse momentum. [...]
arXiv:1402.4770; CMS-SUS-13-012; CERN-PH-EP-2014-015.- Geneva : CERN, 2014 - 37 p. - Published in : J. High Energy Phys. 06 (2014) 055 Springer Open Access article: PDF; External link: Preprint

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2014-02-16
19:22
Measurements of the $t\bar{t}$ charge asymmetry using the dilepton decay channel in pp collisions at $\sqrt{s}$=7 TeV / CMS Collaboration
The $t\bar{t}$ charge asymmetry in proton-proton collisions at $\sqrt{s}$=7 TeV is measured using the dilepton decay channel ($ee, e\mu,$ or $\mu\mu$). The data correspond to a total integrated luminosity of 5.0 inverse-femtobarns, collected by the CMS experiment at the LHC. [...]
arXiv:1402.3803; CMS-TOP-12-010; CERN-PH-EP-2014-010.- Geneva : CERN, 2014 - 33 p. - Published in : J. High Energy Phys. 04 (2014) 191 Springer Open Access article: PDF; External link: Preprint

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