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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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2017-02-21
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 - 32 p. - Published in : 10.1016/j.physletb.2017.04.071 Elsevier Open Access article: 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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2017-02-06
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: PDF;

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2017-01-31
07:18
Observation of the suppressed decay $\Lambda^{0}_{b}\rightarrow p\pi^{-}\mu^{+}\mu^{-}$ / LHCb Collaboration
The suppressed decay $\Lambda^{0}_{b}\rightarrow p\pi^{-}\mu^{+}\mu^{-}$, excluding the $J/\psi$ and $\psi(2S)\rightarrow \mu^{+}\mu^{-}$ resonances, is observed for the first time with a significance of 5.5 standard deviations. The analysis is performed with proton-proton collision data corresponding to an integrated luminosity of $3\mathrm{fb}^{-1}$ collected with the LHCb experiment. [...]
LHCB-PAPER-2016-049; CERN-EP-2016-312; arXiv:1701.08705.- Geneva : CERN, 2017 - 16 p. - Published in : JHEP 04 (2017) 029 Fulltext: PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP; Springer Open Access article: PDF;

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2017-01-30
11:57
Production of muons from heavy-flavour hadron decays in p-Pb collisions at $\sqrt{s_{\rm NN}}=5.02$ TeV / ALICE collaboration
The production of muons from heavy-flavour hadron decays in p-Pb collisions at $\sqrt{s_{\rm NN}}=5.02$ TeV was studied for $2<p_{\rm T}<16$ GeV/$c$ with the ALICE detector at the CERN LHC. The measurement was performed at forward (p-going direction) and backward (Pb-going direction) rapidity, in the ranges of rapidity in the center-of-mass system (cms) $2.03<y_{\rm cms}<3.53$ and $-4.46<y_{\rm cms}<-2.96$, respectively. [...]
CERN-EP-2017-022; arXiv:1702.01479.- Geneva : CERN, 2017 - 25 p. - Published in : Phys. Lett. B 770 (2017) 459-472 Draft (restricted): PDF; Elsevier Open Access article: PDF; Fulltext: arXiv:1702.01479 - PDF; CERN-EP-2017-022 - PDF;

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2017-01-27
16:36
Study of the $D^0 p$ amplitude in $\Lambda_b^0\to D^0 p \pi^-$ decays / LHCb Collaboration
An amplitude analysis of the decay $\Lambda_b^0\to D^0 p \pi^-$ is performed in the part of the phase space containing resonances in the $D^0 p$ channel. The study is based on a data sample corresponding to an integrated luminosity of 3.0 fb$^{-1}$ of $pp$ collisions recorded by the LHCb experiment. [...]
CERN-EP-2017-007; LHCB-PAPER-2016-061; arXiv:1701.07873.- Geneva : CERN, 2017 - 41 p. - Published in : JHEP 05 (2017) 030 Fulltext: PDF; Related data file(s): ZIP; Springer Open Access article: PDF;

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2017-01-25
20:47
Search for single production of vector-like quarks decaying to a Z boson and a top or a bottom quark in proton-proton collisions at $\sqrt{s} = $ 13 TeV / CMS Collaboration
A search for single production of vector-like quarks, T and B, decaying into a Z boson and a top or a bottom quark, respectively, is presented. The search is performed using data collected by the CMS experiment at the LHC in proton-proton collisions at $\sqrt{s}=$ 13 TeV, corresponding to an integrated luminosity of 2.3 fb$^{-1}$. [...]
CMS-B2G-16-001; CERN-EP-2016-326; arXiv:1701.07409; CMS-B2G-16-001.- Geneva : CERN, 2017 - 34 p. - Published in : JHEP 1705 (2017) 029 Fulltext: PDF; Springer Open Access Article: PDF;

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2017-01-24
10:33
Measurement of the cross section for inclusive isolated-photon production in $pp$ collisions at $\sqrt s=13$ TeV using the ATLAS detector / ATLAS Collaboration
Inclusive isolated-photon production in $pp$ collisions at a centre-of-mass energy of 13 TeV is studied with the ATLAS detector at the LHC using a data set with an integrated luminosity of 3.2 fb$^{-1}$. The cross section is measured as a function of the photon transverse energy above 125 GeV in different regions of photon pseudorapidity. [...]
CERN-EP-2016-291; arXiv:1701.06882.- Geneva : CERN, 2017 - 36 p. - Published in : Phys. Lett. B 770 (2017) 473-793 Elsevier Open Access article: PDF; Fulltext: PDF; External link: Previous draft version

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