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PH-EP Articles

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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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2015-03-26
11:08
Combined Measurement of the Higgs Boson Mass in $pp$ Collisions at $\sqrt{s}$ = 7 and 8 TeV with the ATLAS and CMS Experiments / ATLAS and CMS Collaborations
A measurement of the Higgs boson mass is presented based on the combined data samples of the ATLAS and CMS experiments at the CERN LHC in the $H \rightarrow \gamma\gamma$ and $H \rightarrow ZZ\rightarrow 4\ell$ decay channels. The results are obtained from a simultaneous fit to the reconstructed invariant mass peaks in the two channels and for the two experiments. [...]
arXiv:1503.07589; ATLAS-HIGG-2014-14; CMS-HIG-14-042; CERN-PH-EP-2015-075.- Geneva : CERN, 2015 - 45 p. - Published in : Phys. Rev. Lett. 114 (2015) 191803 APS Open Access article: 191803; Fulltext: PDF; External link: Preprint

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2015-03-16
00:00
Search for production of $WW/WZ$ resonances decaying to a lepton, neutrino and jets in $pp$ collisions at $\sqrt{s}$ = 8 TeV with the ATLAS detector / ATLAS Collaboration
A search is presented for a narrow diboson resonances decaying to $WW$ or $WZ$ in the final state where one $W$ boson decays leptonically (to an electron or a muon plus a neutrino) and the other $W/Z$ boson decays hadronically. The analysis is performed using an integrated luminosity of 20.3 fb$^{-1}$ of $pp$ collisions at $\sqrt{s}$ = 8 TeV collected by the ATLAS detector at the LHC. [...]
arXiv:1503.04677; CERN-PH-EP-2015-044.- Geneva : CERN, 2015 - 12 p. - Published in : Eur. Phys. J. C (2015) 75:209 Fulltext: PDF; Springer Open Access article: PDF; External links: Previous draft version; Preprint

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2015-03-12
07:35
Determination of spin and parity of the Higgs boson in the $WW^*\rightarrow e \nu \mu \nu$ decay channel with the ATLAS detector / ATLAS Collaboration
Studies of the spin and parity quantum numbers of the Higgs boson in the $WW^* \rightarrow e \nu \mu \nu$ final state  are presented,  based on proton--proton collision data collected by the ATLAS detector at the Large Hadron Collider, corresponding to an integrated luminosity of 20.3 fb$^{-1}$ at a centre-of-mass energy of $\sqrt{s}=8$ TeV. The Standard Model spin-parity $J^{CP} = 0^{++}$ hypothesis is compared with alternative hypotheses for both spin and CP [...]
arXiv:1503.03643; CERN-PH-EP-2015-037.- Geneva : CERN, 2015 - 42 p. - Published in : Eur. Phys. J. C 75 (2015) 231 Fulltext: PDF; Springer Open Access article: PDF; External links: Previous draft version; Preprint

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2015-03-11
07:46
First observation and amplitude analysis of the $B^{-}\to D^{+}K^{-}\pi^{-}$ decay / LHCb collaboration
The $B^{-}\to D^{+}K^{-}\pi^{-}$ decay is observed in a data sample corresponding to $3.0~\rm{fb}^{-1}$ of $pp$ collision data recorded by the LHCb experiment during 2011 and 2012. Its branching fraction is measured to be ${\cal B}(B^{-}\to D^{+}K^{-}\pi^{-}) = (7.31 \pm 0.19 \pm 0.22 \pm 0.39) \times 10^{-5}$ where the uncertainties are statistical, systematic and from the branching fraction of the normalisation channel $B^{-}\to D^{+}\pi^{-}\pi^{-}$, respectively. [...]
arXiv:1503.02995; CERN-PH-EP-2015-051; LHCB-PAPER-2015-007.- Geneva : CERN, 2015 - 39 p. - Published in : Phys. Rev. D 91 (2015) 092002 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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2015-03-04
07:40
Measurement of forward $\rm Z\rightarrow e^+e^-$ production at $\sqrt{s}=8$ TeV / LHCb collaboration
A measurement of the cross-section for Z-boson production in the forward region of pp collisions at 8TeV centre-of-mass energy is presented. The measurement is based on a sample of $\rm Z\rightarrow e^+e^-$ decays reconstructed using the LHCb detector, corresponding to an integrated luminosity of 2.0fb$^{-1}$. [...]
arXiv:1503.00963; LHCB-PAPER-2015-003; CERN-PH-EP-2015-045.- Geneva : CERN, 2015 - 25 p. - Published in : J. High Energy Phys. 05 (2015) 109 Fulltext: PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP; Springer Open Access article: PDF; External link: Preprint

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2015-02-27
19:19
Study of final-state radiation in decays of Z bosons produced in pp collisions at 7 TeV / CMS Collaboration
The differential cross sections for the production of photons in $\mathrm{Z} \to \mu^+ \mu^- \gamma$ decays are presented as a function of the transverse energy of the photon and its separation from the nearest muon. The data for these measurements were collected with the CMS detector and correspond to an integrated luminosity of 4.7 fb$^{-1}$ of pp collisions at $\sqrt{s}$ = 7 TeV delivered by the CERN LHC. [...]
arXiv:1502.07940; CMS-EWK-11-016; CERN-PH-EP-2015-031.- Geneva : CERN, 2015 - 35 p. - Published in : Phys. Rev. D 91 (2015) 092012 APS Open Access article: PDF; Fulltext: PDF; External link: Preprint

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2015-02-21
10:20
Search for physics beyond the standard model in events with two leptons, jets, and missing transverse momentum in pp collisions at $\sqrt{s}$ = 8 TeV / CMS Collaboration
A search is presented for physics beyond the standard model in final states with two opposite-sign same-flavor leptons, jets, and missing transverse momentum. The data sample corresponds to an integrated luminosity of 19.4 fb$^{-1}$ of proton-proton collisions at $\sqrt{s}$ = 8 TeV collected with the CMS detector at the CERN LHC in 2012. [...]
arXiv:1502.06031; CMS-SUS-14-014; CERN-PH-EP-2015-033.- Geneva : CERN, 2015 - 37 p. - Published in : J. High Energy Phys. 04 (2015) 124 Fulltext: PDF; Springer Open Access article: PDF; External link: Preprint

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2015-02-19
20:33
Measurement of the Z$\gamma$ production cross section in pp collisions at 8 TeV and search for anomalous triple gauge boson couplings / CMS Collaboration
The cross section for the production of Z$\gamma$ in proton-proton collisions at 8 TeV is measured based on data collected by the CMS experiment at the LHC corresponding to an integrated luminosity of 19.5 fb$^{-1}$. Events with an oppositely-charged pair of muons or electrons together with an isolated photon are selected. [...]
arXiv:1502.05664; CMS-SMP-13-014; CERN-PH-EP-2014-303.- Geneva : CERN, 2015 - 39 p. - Published in : J. High Energy Phys. 04 (2015) 164 Fulltext: PDF; Springer Open Access article: PDF; External link: Preprint

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2015-02-19
00:15
Nuclear effects on the transverse momentum spectra of charged particles in pPb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV / CMS Collaboration
Transverse momentum spectra of charged particles are measured by the CMS experiment at the CERN LHC in pPb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV, in the range of $p_\mathrm{T}$ between 0.4 and 120 GeV/$c$ and pseudorapidity $|\eta_\mathrm{CM}|$ lower than 1.8 in the proton-nucleon center-of-mass frame. For $p_\mathrm{T}$ lower than 10 GeV/$c$, the charged-particle production is asymmetric about $|\eta_\mathrm{CM}|$ = 0, with smaller yield observed in the direction of the proton beam, qualitatively consistent with expectations from shadowing in nuclear parton distribution functions (nPDF). [...]
arXiv:1502.05387; CMS-HIN-12-017; CERN-PH-EP-2014-282.- Geneva : CERN, 2015 - 37 p. - Published in : Eur. Phys. J. C 75 (2015) 237 Fulltext: PDF; Springer Open Access article: PDF; External link: Preprint

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