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PH-EP Articles

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2017-03-20
12:28
Measurement of the $B^0_s\to\mu^+\mu^-$ branching fraction and effective lifetime and search for $B^0\to\mu^+\mu^-$ decays / LHCb Collaboration
A search for the rare decays $B^0_s\to\mu^+\mu^-$ and $B^0\to\mu^+\mu^-$ is performed at the LHCb experiment using data collected in $pp$ collisions corresponding to a total integrated luminosity of 4.4 fb$^{-1}$. An excess of $B^0_s\to\mu^+\mu^-$ decays is observed with a significance of 7.8 standard deviations, representing the first observation of this decay in a single experiment. [...]
CERN-EP-2017-041; LHCB-PAPER-2017-001; arXiv:1703.05747; CERN-EP-2017-041-LHCB-PAPER-2017-001.- Geneva : CERN, 2017 - 19 p. - Published in : Phys. Rev. Lett. 118 (2017) 191801 APS Open Access Article: PDF; Fulltext: 10.1103_PhysRevLett.118.191801 - PDF; arXiv:1703.05747 - PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP;

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2017-03-18
22:59
Search for anomalous couplings in boosted $\mathrm{ WW/WZ }\to\ell\nu\mathrm{ q \bar{q} }$ production in proton-proton collisions at $\sqrt{s} =$ 8 TeV / CMS Collaboration
This Letter presents a search for new physics manifested as anomalous triple gauge boson couplings in WW and WZ diboson production in proton-proton collisions. The search is performed using events containing a W boson that decays leptonically and a W or Z boson whose decay products are merged into a single reconstructed jet. [...]
CMS-SMP-13-008; CERN-EP-2017-029; arXiv:1703.06095.- Geneva : CERN, 2017 - 30 p. - Published in : Phys. Lett. B B 772 (2017) 21-42 Article from SCOAP3: PDF; Fulltext: PDF;

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2017-03-07
21:17
Measurement of the top quark mass using single top quark events in proton-proton collisions at $\sqrt{s}= $ 8 TeV / CMS Collaboration
A measurement of the top quark mass is reported in events containing a single top quark produced via the electroweak $t$ channel. The analysis is performed using data from proton-proton collisions collected with the CMS detector at the LHC at a centre-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 19.7 fb$^{-1}$. [...]
CMS-TOP-15-001; CERN-EP-2017-012; arXiv:1703.02530.- Geneva : CERN, 2017 - 36 p. - Published in : Eur. Phys .J. C 77 (2017) 354 Fulltext: PDF;

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2017-02-21
13:05
Performance of the ATLAS Transition Radiation Tracker in Run 1 of the LHC: tracker properties / ATLAS Collaboration
The tracking performance parameters of the ATLAS Transition Radiation Tracker (TRT) as part of the ATLAS inner detector are described in this paper for different data-taking conditions in proton--proton, proton--lead and lead--lead collisions at the Large Hadron Collider (LHC). The performance is studied using data collected for different data-taking conditions in proton--proton, proton--lead and lead--lead collisions at the Large Hadron Collider (LHC). [...]
CERN-EP-2016-311; arXiv:1702.06473.- Geneva : CERN, 2017 - 45 p. - Published in : JINST 12 (2017) P05002 Preprint: PDF; External link: Previous draft version

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2017-02-10
11:02
Measurement of the cross section for electroweak production of Z$\gamma$ in association with two jets and constraints on anomalous quartic gauge couplings in proton-proton collisions at $\sqrt{s} = $ 8 TeV / CMS Collaboration
A measurement is presented of the cross section for the electroweak production of a Z boson and a photon in association with two jets in proton-proton collisions at $ \sqrt{s} = $ 8 TeV. The Z bosons are identified through their decays to electron or muon pairs. [...]
CMS-SMP-14-018; CERN-EP-2016-308; arXiv:1702.03025.- Geneva : CERN, 2017-07-10 - 32 p. - Published in : Phys. Lett. B 770 (2017) 380-402 Article from SCOAP3: PDF; Fulltext: PDF;

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2017-02-10
07:38
Flow dominance and factorization of transverse momentum correlations in Pb-Pb collisions at the LHC / ALICE Collaboration
We present the first measurement of the two-particle transverse momentum differential correlation function, $P_2\equiv\langle \Delta p_{\rm T} \Delta p_{\rm T} \rangle /\langle p_{\rm T} \rangle^2$, in Pb-Pb collisions at $\sqrt{s_{_{\rm NN}}} =$ 2.76 TeV. Results for $P_2$ are reported as a function of relative pseudorapidity ($\Delta \eta$) and azimuthal angle ($\Delta \varphi$) between two particles for different collision centralities. [...]
CERN-EP-2017-021; arXiv:1702.02665.- Geneva : CERN, 2017 - 16 p. - Published in : Phys. Rev. Lett. 118 (2017) 162302 APS Open Access article: PDF; Fulltext: 10.1103_PhysRevLett.118.162302 - PDF; arXiv:1702.02665 - PDF;

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2017-02-09
08:13
Azimuthally differential pion femtoscopy in Pb-Pb collisions at $\sqrt{s_{\rm NN}}=2.76$ TeV / ALICE Collaboration
We present the first azimuthally differential measurements of the pion source size relative to the second harmonic event plane in Pb-Pb collisions at a center-of-mass energy per nucleon-nucleon pair of $\sqrt{s_{\rm NN}}=2.76$ TeV. The measurements have been performed in the centrality range 0-50% and for pion pair transverse momenta $0.2 < k_{\rm T} < 0.7$ GeV/$c$. [...]
CERN-EP-2017-013; arXiv:1702.01612.- Geneva : CERN, 2017 - 16 p. - Published in : Phys. Rev. Lett. 118 (2017) 222301 Fulltext: arXiv:1702.01612 - PDF; 10.1103_PhysRevLett.118.222301 - PDF; PRL OA article: PDF;

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2017-02-09
08:12
Production of $\pi^0$ and $\eta$ mesons up to high transverse momentum in pp collisions at 2.76 TeV / ALICE Collaboration
The invariant differential cross sections for inclusive $\pi^{0}$ and $\eta$ mesons at midrapidity were measured in pp collisions at $\sqrt{s}=2.76$ TeV for transverse momenta $0.4 < p_{\rm T} < 40$ GeV/$c$ and $0.6 < p_{\rm T} < 20$ GeV/$c$, respectively, using the ALICE detector. This large range in $p_{\rm T}$ was achieved by combining various analysis techniques and different triggers involving the electromagnetic calorimeter (EMCal). [...]
CERN-EP-2017-019; arXiv:1702.00917.- Geneva : CERN, 2017-05-22 - 33 p. - Published in : Eur. Phys. J. C 77 (2017) 339 Fulltext: PDF; Springer Open Access article: PDF;

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2017-02-06
11:32
Measurement of prompt and nonprompt $ \mathrm{J} / \psi $ production in pp and pPb collisions at $\sqrt{s_{\mathrm{NN}}} = $ 5.02 TeV / CMS Collaboration
This paper reports the measurement of $ \mathrm{J} / \psi $ meson production in proton-proton (pp) and proton-lead (pPb) collisions at a center-of-mass energy per nucleon pair of 5.02 TeV by the CMS experiment at the LHC. The data samples used in the analysis correspond to integrated luminosities of 28 pb$^{-1}$ and 35 nb$^{-1}$ for pp and pPb collisions, respectively. [...]
CMS-HIN-14-009; CERN-EP-2017-009; arXiv:1702.01462.- Geneva : CERN, 2017 - Published in : Eur. Phys. J. C 77 (2017) 269 Fulltext: cms-hin-14-009-arxiv - PDF; arXiv:1702.01462 - PDF; Springer Open Access article: PDF;

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2017-02-04
07:25
K$^{*}(892)^{0}$ and $\phi(1020)$ meson production at high transverse momentum in pp and Pb-Pb collisions at $\sqrt{s_\mathrm{NN}}$ = 2.76 TeV / ALICE Collaboration
The production of K$^{*}(892)^{0}$ and $\phi(1020)$ mesons in proton-proton (pp) and lead-lead (Pb-Pb) collisions at $\sqrt{s_\mathrm{NN}} =$ 2.76 TeV has been analyzed using a high luminosity data sample accumulated in 2011 with ALICE detector at the Large Hadron Collider (LHC). Transverse momentum ($p_{\mathrm{T}}$) spectra have been measured for K$^{*}(892)^{0}$ and $\phi(1020)$ mesons via their hadronic decay channels for $p_{\mathrm{T}}$ up to 20 GeV/$c$. [...]
CERN-EP-2017-010; arXiv:1702.00555.- Geneva : CERN, 2017 - 26 p. - Published in : Phys. Rev. C 95 (2017) 064606 Fulltext: PDF;

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