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PH-EP Articles

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2015-04-30
07:43
Identification of beauty and charm quark jets at LHCb / LHCb collaboration
Identification of jets originating from beauty and charm quarks is important for measuring Standard Model processes and for searching for new physics. The performance of algorithms developed to select $b$- and $c$-quark jets is measured using data recorded by LHCb from proton-proton collisions at $\sqrt{s}=7$ TeV in 2011 and at $\sqrt{s}=8$ TeV in 2012. [...]
arXiv:1504.07670; LHCB-PAPER-2015-016; CERN-PH-EP-2015-101.- Geneva : CERN, 2015 - 31 p. - Published in : J. Instrum. 10 (2015) P06013 Fulltext: PDF; Related data file(s): ZIP; External link: Preprint

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2015-04-22
07:50
A study of $CP$ violation in $B^\mp \rightarrow Dh^\mp$ ($h=K,\pi$) with the modes $D \rightarrow K^\mp \pi^\pm \pi^0$, $D \rightarrow \pi^+\pi^-\pi^0$ and $D \rightarrow K^+K^-\pi^0$ / LHCb collaboration
An analysis of the decays of $B^\mp \rightarrow D K^\mp$ and $B^\mp \rightarrow D \pi^\mp $ is presented in which the $D$ meson is reconstructed in the three-body final states $K^\mp \pi^\pm \pi^0$, $\pi^+ \pi^- \pi^0$ and $K^+ K^- \pi^0$. Using data from LHCb corresponding to an integrated luminosity of 3.0~fb$^{-1}$ of $pp$ collisions, measurements of several $CP$ observables are performed. [...]
arXiv:1504.05442; CERN-PH-EP-2015-097; LHCB-PAPER-2015-014.- Geneva : CERN, 2015 - 25 p. - Published in : Phys. Rev. D 91 (2015) 112014 APS Open Access article: PDF; Fulltext: PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP; External link: Preprint

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2015-04-16
17:25
Search for invisible decays of the Higgs boson produced in association with a hadronically decaying vector boson in $pp$ collisions at $\sqrt{s} = 8$ TeV with the ATLAS detector / ATLAS Collaboration
A search for Higgs boson decays to invisible particles is performed using 20.3 fb$^{-1}$ of $pp$ collision data at a centre-of-mass energy of 8 TeV recorded by the ATLAS detector at the Large Hadron Collider. The process considered is Higgs boson production in association with a vector boson ($V$ = $W$ or $Z$) that decays hadronically, resulting in events with two or more jets and large missing transverse momentum. [...]
arXiv:1504.04324; CERN-PH-EP-2015-061.- Geneva : CERN, 2015 - 14 p. - Published in : Eur. Phys. J. C (2015) 75:337 Fulltext: PDF; External links: Previous draft version; Preprint

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2015-04-16
15:47
Measurement of the top pair production cross-section in 8 TeV proton--proton collisions using kinematic information in the lepton+jets final state with ATLAS / ATLAS Collaboration
A measurement is presented of the $t\bar{t}$ inclusive production cross-section in $pp$ collisions at a center-of-mass energy of $\sqrt{s}=8$ TeV using data collected by the ATLAS detector at the CERN Large Hadron Collider. The measurement was performed in the lepton+jets final state using a data set corresponding to an integrated luminosity of 20.3 fb$^{-1}$. [...]
arXiv:1504.04251; CERN-PH-EP-2015-024.- Geneva : CERN, 2015 - 17 p. - Published in : Phys. Rev. D 91 (2015) 112013 APS Open Access article: PDF; Fulltext: PDF; External links: Previous draft version; Preprint

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2015-04-01
17:02
Search for New Phenomena in Dijet Angular Distributions in Proton-Proton Collisions at $\sqrt{s} = 8$ TeV Measured with the ATLAS Detector / ATLAS Collaboration
A search for new phenomena in LHC proton-proton collisions at a center-of-mass energy of $\sqrt{s}=8$ TeV was performed with the ATLAS detector using an integrated luminosity of 17.3 fb$^{-1}$. The angular distributions are studied in events with at least two jets; the highest dijet mass observed is 5.5 TeV. [...]
arXiv:1504.00357; CERN-PH-EP-2015-067.- Geneva : CERN, 2015 - 4 p. - Published in : Phys. Rev. Lett. 114 (2015) 221802 APS Open Access article: PDF; Fulltext: PDF; External links: Previous draft version; Preprint

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2015-04-01
07:54
First observation and measurement of the branching fraction for the decay $B^0_s \to D_s^{*\mp} K^{\pm}$ / LHCb Collaboration
The first observation of the $B^0_s \to D_s^{*\mp} K^{\pm}$ decay is reported using 3.0$fb^{-1}$ of proton-proton collision data collected by the LHCb experiment. The $D_s^{*\mp}$ mesons are reconstructed through the decay chain $D_s^{*\mp} \to \gamma D_s^{\mp}(K^{\mp}K^{\pm}\pi^{\mp})$. [...]
arXiv:1503.09086; LHCB-PAPER-2015-008; CERN-PH-EP-2015-081.- Geneva : CERN, 2015 - 17 p. - Published in : J. High Energy Phys. 06 (2015) 130 Fulltext: PDF; Related data file(s): ZIP; Springer Open Access article: PDF; External link: Preprint

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2015-03-30
20:00
Measurement of diffractive dissociation cross sections in pp collisions at $\sqrt{s}$ =7 TeV / CMS Collaboration
Measurements of diffractive dissociation cross sections in pp collisions at $\sqrt{s}$ = 7 TeV are presented in kinematic regions defined by the masses $M_X$ and $M_Y$ of the two final-state hadronic systems separated by the largest rapidity gap in the event. Differential cross sections are measured as a function of $\xi_X= M^2_X/s$ in the region $\log_{10}\xi_X$ between $-5.5$ and $-2.5$, for $\log_{10}M_Y$ lower than $0.5$, dominated by single dissociation (SD), and $\log_{10}M_Y$ between $0.5$ and $1.1$, dominated by double dissociation (DD), where $M_X$ and $M_Y$ are given in GeV. [...]
arXiv:1503.08689; CERN-PH-EP-2015-062; CMS-FSQ-12-005.- Geneva : CERN, 2015 - 49 p. - Published in : Phys. Rev. D 92 (2015) 012003 APS Open Access article: PDF; Fulltext: PDF; External link: Preprint

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2015-03-30
07:38
Search for low-scale gravity signatures in multi-jet final states with the ATLAS detector at $\sqrt{s}$ = 8 TeV / ATLAS Collaboration
We search for evidence of physics beyond the Standard Model in the production of final states with multiple high transverse momentum jets, using 20.3 $fb^{-1}$ of proton-proton collision data recorded by the ATLAS detector at $\sqrt{s}$ = 8 TeV. No excess of events beyond Standard Model expectations is observed, and upper limits on the visible cross-section for non-Standard Model production of multi-jet final states are set. [...]
arXiv:1503.08988; CERN-PH-EP-2015-066.- Geneva : CERN, 2015 - 23 p. - Published in : J. High Energy Phys. 07 (2015) 032 Fulltext: PDF; External links: Previous draft version; Preprint

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2015-03-27
16:01
Searches for third-generation squark production in fully hadronic final states in proton-proton collisions at $\sqrt{s}$ = 8 TeV / CMS Collaboration
Searches for third-generation squarks in fully hadronic final states are presented using data samples corresponding to integrated luminosities of 19.4 or 19.7 fb$^{-1}$, collected at a centre-of-mass energy of 8 TeV with the CMS detector at the LHC. Three mutually exclusive searches are presented, each optimized for a different decay topology. [...]
arXiv:1503.08037; CMS-SUS-14-001; CERN-PH-EP-2015-055.- Geneva : CERN, 2015 - 59 p. - Published in : J. High Energy Phys. 06 (2015) 116 Fulltext: PDF; Springer Open Access article: PDF; External link: Fulltext

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2015-03-27
07:41
Rapidity and transverse-momentum dependence of the inclusive J/$\mathbf{\psi}$ nuclear modification factor in p-Pb collisions at $\mathbf{\sqrt{\textit{s}_{NN}}}=5.02$ TeV / ALICE Collaboration
We have studied the transverse-momentum ($p_{\rm T}$) dependence of the inclusive J/$\psi$ production in p-Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ TeV, in three center-of-mass rapidity ($y_{\rm cms}$) regions, down to zero $p_{\rm T}$. Results in the forward and backward rapidity ranges ($2.03 < y_{\rm cms} < 3.53$ and $-4.46 < y_{\rm cms} < -2.96$) are obtained by studying the J/$\psi$ decay to $\mu^+\mu^-$, while the mid-rapidity region ($-1.37 < y_{\rm cms} < 0.43$) is investigated by measuring the ${\rm e}^+{\rm e}^-$ decay channel. [...]
arXiv:1503.07179; CERN-PH-EP-2015-030.- Geneva : CERN, 2015 - 27 p. - Published in : J. High Energy Phys. 06 (2015) 055 Fulltext: PDF; Springer Open Access article: PDF; External link: Preprint

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