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PH-EP Articles

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2016-01-21
21:43
Anisotropic flow of charged particles in Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV / ALICE Collaboration
We report the first results of elliptic ($v_2$), triangular ($v_3$) and quadrangular flow ($v_4$) of charged particles in Pb--Pb collisions at $\sqrt{s_{_{\rm NN}}}=$ 5.02 TeV with the ALICE detector at the CERN Large Hadron Collider. The measurements are performed in the central pseudorapidity region $|\eta| <$ 0.8 and for the transverse momentum range 0.2 $< p_{\rm T} < $ 5 GeV/$c$. [...]
arXiv:1602.01119; CERN-EP-2016-018.- Geneva : CERN, 2016 - 16 p. - Published in : Phys. Rev. Lett. 116 (2016) 132302 Draft (restricted): PDF; Fulltext: CERN-EP-2016-018 - PDF; arXiv:1602.01119 - PDF; External link: Fulltext

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2016-01-21
09:02
Observation of the $B_s^0 \rightarrow J/\psi \phi \phi$ decay / LHCb collaboration
The $B_s^0 \rightarrow J/\psi \phi \phi$ decay is observed in $pp$ collision data corresponding to an integrated luminosity of 3 fb$^{-1}$ recorded by the LHCb detector at centre-of-mass energies of 7 TeV and 8 TeV. This is the first observation of this decay channel, with a statistical significance of 15 standard deviations. [...]
arXiv:1601.05284; LHCB-PAPER-2015-033; CERN-EP-2016-006.- Geneva : CERN, 2016 - Published in : J. High Energy Phys. 03 (2016) 040 Fulltext: PDF; Related data file(s): ZIP; Springer Open Access article: PDF; External link: Preprint

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2016-01-08
07:46
Study of $D^{(*)+}_{sJ}$ mesons decaying to $D^{*+} K^0_{\rm S}$ and $D^{*0} K^+$ final states / LHCb collaboration
A search is performed for $D^{(*)+}_{sJ}$ mesons in the reactions $pp \to D^{*+} K^0_{\rm S} X$ and $pp \to D^{*0} K^+ X$ using data collected at centre-of-mass energies of 7 and 8 TeV with the LHCb detector. For the $D^{*+} K^0_{\rm S}$ final state, the decays $D^{*+} \to D^0 \pi^+$ with $D^0 \to K^- \pi^+$ and $D^0 \to K^- \pi^+ \pi^+ \pi^-$ are used. [...]
arXiv:1601.01495; CERN-PH-EP-2015-322; LHCB-PAPER-2015-052.- Geneva : CERN, 2016 - 26 p. - Published in : J. High Energy Phys. 02 (2016) 133 Fulltext: PDF; Related data file(s): ZIP; Springer Open Access article: PDF; External link: Preprint

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2016-01-06
09:49
Measurements of $\mathrm{ t \bar{t} }$ spin correlations and top quark polarization using dilepton final states in pp collisions at $\sqrt{s}=$ 8 TeV / CMS Collaboration
Measurements of the top quark-antiquark ($\mathrm{ t \bar{t} }$) spin correlations and the top quark polarization are presented for $\mathrm{ t \bar{t} }$ pairs produced in pp collisions at $\sqrt{s}= $ 8 TeV. The data correspond to an integrated luminosity of 19.5 fb$^{-1}$ collected with the CMS detector at the LHC. [...]
arXiv:1601.01107; CMS-TOP-14-023; CERN-PH-EP-2015-333.- Geneva : CERN, 2016 - 40 p. - Published in : Phys. Rev. D 93 (2016) 052007 APS Open Access article: PDF; Fulltext: PDF; External link: Preprint

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2015-12-28
12:32
Measurement of differential and integrated fiducial cross sections for Higgs boson production in the four-lepton decay channel in pp collisions at $\sqrt{s} =$ 7 and 8 TeV / CMS Collaboration
Differential and integrated fiducial cross sections for the production of four leptons via the $ \mathrm{H} \rightarrow 4\ell$ decays ($\ell = \mathrm{e}$, $\mu$) are measured in pp collisions at $\sqrt{s} =$ 7 and 8 TeV. Measurements are performed with data corresponding to integrated luminosities of 5.1 fb$^{-1}$ at 7 TeV, and 19.7 fb$^{-1}$ at 8 TeV, collected with the CMS experiment at the LHC. [...]
arXiv:1512.08377; CMS-HIG-14-028; CERN-PH-EP-2015-285.- Geneva : CERN, 2016 - 42 p. - Published in : J. High Energy Phys. 04 (2016) 005 Fulltext: PDF; Springer Open Access article: PDF; External link: Fulltext

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2015-12-18
18:37
Measurement of the charge asymmetry in highly boosted top-quark pair production in $\sqrt{s} =$ 8 TeV $pp$ collision data collected by the ATLAS experiment / ATLAS Collaboration
In the $pp \rightarrow t\bar{t}$ process the angular distributions of top and anti-top quarks are expected to present a subtle difference, which could be enhanced by processes not included in the Standard Model. This Letter presents a measurement of the charge asymmetry in events where the top-quark pair is produced with a large invariant mass. [...]
arXiv:1512.06092; CERN-PH-EP-2015-303.- Geneva : CERN, 2016 - 36 p. - Published in : Phys. Lett. B 756 (2016) 52-71 Elsevier Open Access article: PDF; Fulltext: PDF; External links: Previous draft version; Preprint

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2015-12-18
10:02
Search for new phenomena with photon+jet events in proton–proton collisions at $\sqrt{s} = 13$ TeV with the ATLAS detector / ATLAS Collaboration
A search is performed for the production of high-mass resonances decaying into a photon and a jet in 3.2 fb${}^{-1}$ of proton--proton collisions at a centre-of-mass energy of $\sqrt{s} = 13$ TeV collected by the ATLAS detector at the Large Hadron Collider. Selected events have an isolated photon and a jet, each with transverse momentum above 150 GeV. [...]
CERN-PH-EP-2015-320; arXiv:1512.05910.- Geneva : CERN, 2016 - 38 p. - Published in : J. High Energy Phys. 03 (2016) 041 Fulltext: PDF; Springer Open Access article: PDF; External links: Previous draft version; Preprint

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2015-12-16
16:48
Measurement of the $ZZ$ Production Cross Section in $pp$ Collisions at $\sqrt{s} = 13$ TeV with the ATLAS Detector / ATLAS Collaboration
The $ZZ$ production cross section in proton--proton collisions at 13 TeV center-of-mass energy is measured using $3.2~\mathrm{fb}^{-1}$ of data recorded with the ATLAS detector at the Large Hadron Collider. The considered $Z$ boson candidates decay to an electron or muon pair of mass 66--116 GeV. [...]
arXiv:1512.05314; CERN-PH-EP-2015-318.- Geneva : CERN, 2016 - 28 p. - Published in : Phys. Rev. Lett. 116 (2016) 101801 Fulltext: PDF; External links: Previous draft version; Preprint

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2015-12-16
09:28
Combination of searches for $WW$, $WZ$, and $ZZ$ resonances in $pp$ collisions at $\sqrt{s} = 8$ TeV with the ATLAS detector / ATLAS Collaboration
The ATLAS experiment at the CERN Large Hadron Collider has performed searches for new, heavy bosons decaying to $WW$, $WZ$ and $ZZ$ final states in multiple decay channels using 20.3 fb^{-1} of $pp$ collision data at $\sqrt{s} = 8$ TeV. In the current study, the results of these searches are combined to provide a more stringent test of models predicting heavy resonances with couplings to vector bosons. [...]
arXiv:1512.05099; CERN-PH-EP-2015-269.- Geneva : CERN, 2016 - 37 p. - Published in : Phys. Lett. B 755 (2016) 285-305 Elsevier Open Access article: PDF; Fulltext: PDF; External links: Previous draft version; Preprint

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2015-12-16
08:05
Angular analysis of the $B^{0}\rightarrow K^{*0}\mu^{+}\mu^{-}$ decay using 3 fb$^{-1}$ of integrated luminosity / LHCb collaboration
An angular analysis of the $B^{0}\rightarrow K^{*0}(\rightarrow K^{+}\pi^{-})\mu^{+}\mu^{-}$ decay is presented. The dataset corresponds to an integrated luminosity of $3.0\,{\mbox{fb}^{-1}}$ of $pp$ collision data collected at the LHCb experiment. [...]
arXiv:1512.04442; CERN-PH-EP-2015-314; LHCB-PAPER-2015-051.- 2016 - 92 p. - Published in : J. High Energy Phys. 02 (2016) 104 Fulltext: PDF; Related data file(s): ZIP; Related supplementary data file(s) updated: ZIP; Springer Open Access article: PDF; External link: Preprint

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