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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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2014-05-14
15:02
Search for massive resonances decaying into pairs of boosted bosons in semi-leptonic final states at $\sqrt{s}$ = 8 TeV / CMS Collaboration
A search for new resonances decaying to WW, ZZ, or WZ is presented. Final states are considered in which one of the vector bosons decays leptonically and the other hadronically. [...]
arXiv:1405.3447; CMS-EXO-13-009; CERN-PH-EP-2014-076.- Geneva : CERN, 2014 - 59 p. - Published in : J. High Energy Phys. 08 (2014) 174 Springer Open Access article: PDF; External link: Preprint

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2014-05-14
14:26
Constraints on the Higgs boson width from off-shell production and decay to Z-boson pairs / CMS Collaboration
Constraints are presented on the total width of the recently discovered Higgs boson, Gamma_H, using its relative on-shell and off-shell production and decay rates to a pair of Z bosons, where one Z boson decays to an electron or muon pair, and the other to an electron, muon, or neutrino pair. The analysis is based on the data collected by the CMS experiment at the LHC in 2011 and 2012, corresponding to integrated luminosities of 5.1 inverse-femtobarns at a centre-of-mass energy $\sqrt{s}$ = 7 TeV and 19.7 inverse-femtobarns at $\sqrt{s}$ = 8 TeV. [...]
arXiv:1405.3455; CMS-HIG-14-002; CERN-PH-EP-2014-078.- Geneva : CERN, 2014 - 29 p. - Published in : Phys. Lett. B 736 (2014) 64 Elsevier Open Access article: PDF; External link: Preprint

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2014-05-13
12:18
Monitoring and data quality assessment of the ATLAS liquid argon calorimeter / ATLAS Collaboration
The liquid argon calorimeter is a key component of the ATLAS detector installed at the CERN Large Hadron Collider. The primary purpose of this calorimeter is the measurement of electrons and photons. [...]
arXiv:1405.3768; CERN-PH-EP-2014-045.- Geneva : CERN, 2014 - 39 p. - Published in : J. Instrum. 9 (2014) P07024 IOP Open Access article: PDF; External links: Previous draft version; Preprint

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2014-05-13
05:16
Measurement of $CP$ asymmetry in $D^0 \rightarrow K^- K^+$ and $D^0 \rightarrow \pi^- \pi^+$ decays / LHCb collaboration
Time-integrated $CP$ asymmetries in $D^0$ decays to the final states $K^- K^+$ and $\pi^- \pi^+$ are measured using proton-proton collisions corresponding to $3\mathrm{\,fb}^{-1}$ of integrated luminosity collected at centre-of-mass energies of $7\mathrm{\,Te\kern -0.1em V}$ and $8\mathrm{\,Te\kern -0.1em V}$. The $D^0$ mesons are produced in semileptonic $b$-hadron decays, where the charge of the accompanying muon is used to determine the initial flavour of the charm meson. [...]
arXiv:1405.2797; CERN-PH-EP-2014-082; LHCB-PAPER-2014-013.- Geneva : CERN, 2014 - 19 p. - Published in : J. High Energy Phys. 07 (2014) 014 Related data file(s): ZIP; Related supplementary data file(s): ZIP; External link: Preprint

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2014-05-09
05:14
Search for massive resonances in dijet systems containing jets tagged as W or Z boson decays in pp collisions at $\sqrt{s}$= 8 TeV / CMS Collaboration
A search is reported for massive resonances decaying into a quark and a vector boson (W or Z), or two vector bosons (WW, WZ, or ZZ). The analysis is performed on an inclusive sample of multijet events corresponding to an integrated luminosity of 19.7 inverse femtobarns, collected in proton-proton collisions at a centre-of-mass energy of 8 TeV with the CMS detector at the LHC. [...]
arXiv:1405.1994; CMS-EXO-12-024; CERN-PH-EP-2014-071.- Geneva : CERN, 2014 - 33 p. - Published in : J. High Energy Phys. 08 (2014) 173 Springer Open Access article: PDF; External link: Preprint

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2014-05-08
05:21
Measurement of the $\Xi_b^-$ and $\Omega_b^-$ baryon lifetimes / LHCb collaboration
Using a data sample of pp collisions corresponding to an integrated luminosity of $3~ \rm fb^{-1}$, the $\Xi_b^-$ and $\Omega_b^-$ baryons are reconstructed in the $\Xi_b^- \rightarrow J/\psi \Xi^-$ and $\Omega_b^- \rightarrow J/\psi \Omega^-$ decay modes and their lifetimes measured to be $\tau (\Xi_b^-) = 1.55\, ^{+0.10}_{-0.09}~{\rm(stat)} \pm 0.03\,{\rm(syst)}$ ps, $\tau (\Omega_b^-) = 1.54\, ^{+0.26}_{-0.21}~{\rm(stat)} \pm 0.05\,{\rm(syst)}$ ps. These are the most precise determinations to date. [...]
arXiv:1405.1543; CERN-PH-EP-2014-081; LHCB-PAPER-2014-010.- Geneva : CERN, 2014 - 13 p. - Published in : Phys. Lett. B 736 (2014) 154-162 Elsevier Open Access article: PDF; Related data file(s): ZIP; External link: Preprint

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2014-05-05
18:47
Operation and performance of the ATLAS semiconductor tracker / ATLAS Collaboration
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. [...]
arXiv:1404.7473; CERN-PH-EP-2014-049.- Geneva : CERN, 2014 - 80 p. - Published in : J. Instrum. 9 (2014) P08009 Fulltext: PDF; IOP Open Access article: PDF; External links: Preprint; Previous draft version

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2014-05-05
14:13
Measurement of the resonant and CP components in $\overline{B}^0\rightarrow J/\psi \pi^+\pi^-$ decays / LHCb Collaboration
The resonant structure of the reaction $\overline{B}^0\rightarrow J/\psi \pi^+\pi^-$ is studied using data from 3 fb$^{-1}$ of integrated luminosity collected by the LHCb experiment, one-third at 7 Tev center-of-mass energy and the remainder at 8 Tev. The invariant mass of the $\pi^+\pi^-$ pair and three decay angular distributions are used to determine the fractions of the resonant and non-resonant components. [...]
arXiv:1404.5673; CERN-PH-EP-2014-069; LHCB-PAPER-2014-012.- Geneva : CERN, 2014 - 28 p. - Published in : Phys. Rev. D 90 (2014) 012003 APS published version, local copy: PDF; Related data file(s): ZIP; External link: Preprint

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2014-04-08
22:59
Measurement of the ratio $B(t \to Wb)/B(t \to Wq)$ in pp collisions at $\sqrt{s}$ = 8 TeV / CMS Collaboration
The ratio of the top-quark branching fractions $R = B(t \to Wb)/B(t \to Wq)$, where the denominator includes the sum over all down-type quarks (q = b, s, d), is measured in the $t\bar{t}$ dilepton final state with proton-proton collision data at $\sqrt{s}$ = 8 TeV from an integrated luminosity of 19.7 inverse-femtobarns, collected with the CMS detector. In order to quantify the purity of the signal sample, the cross section is measured by fitting the observed jet multiplicity, thereby constraining the signal and background contributions. [...]
arXiv:1404.2292; CMS-TOP-12-035; CERN-PH-EP-2014-052.- Geneva : CERN, 2014 - 37 p. - Published in : Phys. Lett. B 736 (2014) 33 Elsevier Open Access article: PDF; External link: Preprint

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