PH-EP Articles

Последние добавления:
2015-07-26
21:34
 Measurement of the underlying event activity using charged-particle jets in proton-proton collisions at $\sqrt{s}=$ 2.76 TeV / CMS Collaboration A measurement of the underlying event (UE) activity in proton-proton collisions is performed using events with charged-particle jets produced in the central pseudorapidity region ($|{\eta^{\text{jet}}} |$ < 2) and with transverse momentum 1 $\le p_{\mathrm{T}}^\text{jet} \lt$ 100 GeV. The analysis uses a data sample collected at a centre-of-mass energy of 2.76 TeV with the CMS experiment at the LHC. [...] arXiv:1507.07229; CMS-FSQ-12-025; CERN-PH-EP-2015-176.- Geneva : CERN, 2015 - 30 p. - Published in : J. High Energy Phys. 09 (2015) 137 Fulltext: PDF; External link: Preprint

2015-07-14
08:36
 Observation of $J/\psi p$ resonances consistent with pentaquark states in ${\Lambda_b^0\to J/\psi K^-p}$ decays / LHCb collaboration Observations of exotic structures in the $J/\psi p$ channel, that we refer to as pentaquark-charmonium states, in $\Lambda_b^0\to J/\psi K^- p$ decays are presented. The data sample corresponds to an integrated luminosity of 3/fb acquired with the LHCb detector from 7 and 8 TeV pp collisions. [...] arXiv:1507.03414; CERN-PH-EP-2015-153; LHCB-PAPER-2015-029.- Geneva : CERN, 2015 - 48 p. - Published in : Phys. Rev. Lett. 115 (2015) 072001 APS Open Access article: PDF; Fulltext: PDF; Related data file(s): ZIP; Related supplementary data file: PDF; Related supplementary data file(s): ZIP; External link: Preprint

2015-06-30
08:05
 Angular analysis and differential branching fraction of the decay $B^0_s\to\phi\mu^+\mu^-$ / LHCb collaboration An angular analysis and a measurement of the differential branching fraction of the decay $B^0_s\to\phi\mu^+\mu^-$ are presented, using data corresponding to an integrated luminosity of $3.0\, {\rm fb}^{-1}$ of $pp$ collisions recorded by the LHCb experiment at $\sqrt{s} = 7$ and $8\, {\rm TeV}$. Measurements are reported as a function of $q^{2}$, the square of the dimuon invariant mass and results of the angular analysis are found to be consistent with the Standard Model. [...] arXiv:1506.08777; CERN-PH-EP-2015-145; LHCB-PAPER-2015-023.- Geneva : CERN, 2015 - 37 p. - Published in : J. High Energy Phys. 09 (2015) 179 Fulltext: PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP; Springer Open Access article: PDF; External link: Preprint

2015-06-29
17:30
 Measurement of the ratio of branching fractions $\mathcal{B}(\overline{B}^0 \to D^{*+}\tau^{-}\overline{\nu}_{\tau}))/\mathcal{B}(\overline{B}^0 \to D^{*+}\mu^{-}\overline{\nu}_{\mu})$ / LHCb Collaboration The branching fraction ratio $\mathcal{R}(D^{*}) \equiv \mathcal{B}(\overline{B}^0 \to D^{*+}\tau^{-}\overline{\nu}_{\tau})/\mathcal{B}(\overline{B}^0 \to D^{*+}\mu^{-}\overline{\nu}_{\mu})$ is measured using a sample of proton-proton collision data corresponding to 3.0 fb$^{-1}$ of integrated luminosity recorded by the LHCb experiment during 2011 and 2012. The tau lepton is identified in the decay mode $\tau^{-} \to \mu^{-}\overline{\nu}_{\mu}\nu_{\tau}$. [...] arXiv:1506.08614; LHCB-PAPER-2015-025; CERN-PH-EP-2015-150.- Geneva : CERN, 2015 - 19 p. - Published in : Phys. Rev. Lett. 115 (2015) 111803 Fulltext: PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP; External links: Previous draft version; Fulltext

2015-06-23
14:09
 Measurement of exclusive $\gamma\gamma\rightarrow \ell^+\ell^-$ production in proton--proton collisions at $\sqrt{s} = 7$ TeV with the ATLAS detector / ATLAS Collaboration This Letter reports a measurement of the exclusive $\gamma\gamma\rightarrow \ell^+\ell^- (\ell=e, \mu)$ cross-section in proton--proton collisions at a centre-of-mass energy of 7 TeV by the ATLAS experiment at the LHC, based on an integrated luminosity of $4.6$ fb$^{-1}$. For the electron or muon pairs satisfying exclusive selection criteria, a fit to the dilepton acoplanarity distribution is used to extract the fiducial cross-sections. [...] arXiv:1506.07098; CERN-PH-EP-2015-134.- Geneva : CERN, 2015 - 12 p. - Published in : Phys. Lett. B 749 (2015) 242-261 Elsevier Open Access article: PDF; Fulltext: PDF; External links: Previous draft version; Preprint

2015-06-22
14:26
 Study of $(W/Z)H$ production and Higgs boson couplings using $H \rightarrow WW^{\ast}$ decays with the ATLAS detector / ATLAS Collaboration A search for Higgs boson production in association with a $W$ or $Z$ boson, in the $H \rightarrow WW^{\ast}$ decay channel, is performed with a data sample collected with the ATLAS detector at the LHC in proton-proton collisions at centre-of-mass energies $\sqrt{s}=7$ TeV and 8 TeV, corresponding to integrated luminosities of 4.5 ${\rm fb}^{-1}$ and 20.3 ${\rm fb}^{-1}$, respectively. The $WH$ production mode is studied in two-lepton and three-lepton final states, while two-lepton and four-lepton final states are used to search for the $ZH$ production mode. [...] arXiv:1506.06641; CERN-PH-EP-2015-104.- Geneva : CERN, 2015 - 48 p. - Published in : J. High Energy Phys. 08 (2015) 137 Fulltext: PDF; Springer Open Access article: PDF; External links: Previous draft version; Preprint

2015-06-19
14:29
 Search for heavy Majorana neutrinos with the ATLAS detector in pp collisions at $\sqrt{s} = 8$ TeV / ATLAS Collaboration A search for heavy Majorana neutrinos in events containing a pair of high-$p_{\mathrm{T}}$ leptons of the same charge and high-$p_{\mathrm{T}}$ jets is presented. The search uses $20.3 \mathrm{fb}^{-1}$ of $pp$ collision data collected with the ATLAS detector at the CERN Large Hadron Collider with a centre-of-mass energy of $\sqrt{s} = 8$ TeV. [...] arXiv:1506.06020; CERN-PH-EP-2015-070.- Geneva : CERN, 2015 - 28 p. - Published in : J. High Energy Phys. 07 (2015) 162 Fulltext: PDF; Springer Open Access article: PDF; External links: Previous draft version; Preprint

2015-06-19
13:51
 Search for the associated production of the Higgs boson with a top quark pair in multilepton final states with the ATLAS detector / ATLAS Collaboration A search for the associated production of the Higgs boson with a top quark pair is performed in multilepton final states using 20.3 fb$^{-1}$ of proton-proton collision data recorded by the ATLAS experiment at $\sqrt{s}=8$ TeV at the Large Hadron Collider. Five final states, targeting the decays $H\to WW^*$, $\tau\tau$, and $ZZ^*$, are examined for the presence of the Standard Model (SM) Higgs boson: two same-charge light leptons ($e$ or $\mu$) without a hadronically decaying $\tau$ lepton; three light leptons; two same-charge light leptons with a hadronically decaying $\tau$ lepton; four light leptons; and one light lepton and two hadronically decaying $\tau$ leptons. [...] arXiv:1506.05988; CERN-PH-EP-2015-109.- Geneva : CERN, 2015 - 14 p. - Published in : Phys. Lett. B 749 (2015) 519-541 Elsevier Open Access article: PDF; Fulltext: PDF; External links: Previous draft version; Preprint

2015-06-18
12:29
 Modelling $Z\to\tau\tau$ processes in ATLAS with $\tau$-embedded $Z\to\mu\mu$ data / ATLAS Collaboration This paper describes the concept, technical realisation and validation of a largely data-driven method to model events with $Z\to\tau\tau$ decays. In $Z\to\mu\mu$ events selected from proton-proton collision data recorded at $\sqrt{s}=8$ TeV with the ATLAS experiment at the LHC in 2012, the $Z$ decay muons are replaced by $\tau$ leptons from simulated $Z\to\tau\tau$ decays at the level of reconstructed tracks and calorimeter cells. [...] arXiv:1506.05623; CERN-PH-EP-2015-130.- Geneva : CERN, 2015 - 22 p. - Published in : J. Instrum. 10 (2015) P09018 Fulltext: PDF; External links: Previous draft version; Preprint

2015-06-17
12:42
 Search for metastable heavy charged particles with large ionisation energy loss in $pp$ collisions at $\sqrt{s}$ = 8 TeV using the ATLAS experiment / ATLAS Collaboration Many extensions of the Standard Model predict the existence of charged heavy long-lived particles, such as $R$-hadrons or charginos. These particles, if produced at the Large Hadron Collider, should be moving non-relativistically and are therefore identifiable through the measurement of an anomalously large specific energy loss in the ATLAS pixel detector. [...] arXiv:1506.05332; CERN-PH-EP-2015-124.- Geneva : CERN, 2015 - 14 p. - Published in : Eur. Phys. J. C 75 (2015) 407 Fulltext: PDF; Springer Open Access article: PDF; External links: Previous draft version; Preprint