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PH-EP Articles

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2014-08-08
09:03
Search for the associated production of the Higgs boson with a top-quark pair / CMS Collaboration
A search for the standard model Higgs boson produced in association with a top-quark pair ($t\bar{t}$H) is presented, using data samples corresponding to integrated luminosities of up to 5.1 fb$^{-1}$ and 19.7 fb$^{-1}$ collected in pp collisions at center-of-mass energies of 7 TeV and 8 TeV respectively. The search is based on the following signatures of the Higgs boson decay: H $\to$ hadrons, H $\to$ photons, and H $\to$ leptons. [...]
arXiv:1408.1682; CMS-HIG-13-029; CERN-PH-EP-2014-189.- Geneva : CERN, 2014 - 61 p. - Published in : J. High Energy Phys. 09 (2014) 087 Fulltext: PDF; Springer Open Access article: PDF; External link: Preprint

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2014-08-06
04:10
Measurement of $C\!P$ asymmetries in the decays $B^0 \rightarrow K^{*0} \mu^+ \mu^-$ and $B^+ \rightarrow K^{+} \mu^+ \mu^-$ / LHCb collaboration
The direct $C\!P$ asymmetries of the decays $B^0 \rightarrow K^{*0} \mu^+ \mu^-$ and $B^+ \rightarrow K^{+} \mu^+ \mu^-$ are measured using $pp$ collision data corresponding to an integrated luminosity of 3.0$\mbox{fb}^{-1}$ collected with the LHCb detector. The respective control modes $B^0 \rightarrow J/\psi K^{*0}$ and $B^+ \rightarrow J/\psi K^{+}$ are used to account for detection and production asymmetries. [...]
arXiv:1408.0978; CERN-PH-EP-2014-191; LHCB-PAPER-2014-032.- Geneva : CERN, 2014 - 19 p. - Published in : J. High Energy Phys. 09 (2014) 177 Fulltext: PDF; Related data file(s): ZIP; Springer Open Access article: PDF; External link: Preprint

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2014-07-28
17:36
Search for new particles in events with one lepton and missing transverse momentum in $pp$ collisions at $\sqrt{s}$ = 8 TeV with the ATLAS detector / ATLAS Collaboration
This paper presents a search for new particles in events with one lepton (electron or muon) and missing transverse momentum using 20.3~$fb^{-1}$ of proton-proton collision data at $\sqrt{s}=8$ TeV recorded by the ATLAS experiment at the Large Hadron Collider. No significant excess beyond Standard Model expectations is observed. [...]
arXiv:1407.7494; CERN-PH-EP-2014-139.- Geneva : CERN, 2014 - 28 p. - Published in : J. High Energy Phys. 09 (2014) 037 Fulltext: PDF; Springer Open Access article: PDF; External links: Previous draft version; Preprint

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2014-07-24
05:00
Observation of charmonium pairs produced exclusively in $pp$ collisions / LHCb collaboration
A search is performed for the central exclusive production of pairs of charmonia produced in proton-proton collisions. Using data corresponding to an integrated luminosity of $3{\rm\ fb}^{-1}$ collected at centre-of-mass energies of 7 and 8 TeV, $J/\psi J/\psi$ and $J/\psi\psi(2S)$ pairs are observed, which have been produced in the absence of any other activity inside the LHCb acceptance that is sensitive to charged particles in the pseudorapidity ranges $(-3.5,-1.5)$ and $(1.5,5.0)$. [...]
arXiv:1407.5973; LHCB-PAPER-2014-027; CERN-PH-EP-2014-174.- Geneva : CERN, 2014 - 20 p. - Published in : J. Phys. G 41 (2014) 115002 Fulltext: PDF; IOP Open Access article: PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP; External link: Preprint

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2014-07-23
16:28
Evidence of $CP$ violation in $B^+\to p\bar{p}K^+$ decays / LHCb Collaboration
Three-body $B^+\to p \overline p K^+$ and $B^+\to p \overline p \pi^+$ decays are studied using a data sample corresponding to an integrated luminosity of 3.0 $fb^{-1}$ collected by the LHCb experiment in proton-proton collisions at center-of-mass energies of $7$ and $8$ TeV. Evidence of $CP$ violation in the $B^+\to p \overline p K^+$ decay is found in regions of the phase space, representing the first measurement of this kind for a final state containing baryons. [...]
arXiv:1407.5907; LHCB-PAPER-2014-034; CERN-PH-EP-2014-173.- Geneva : CERN, 2014 - 17 p. - Published in : Phys. Rev. Lett. 113 (2014) 141801 Fulltext: PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP; External link: Preprint

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2014-07-10
05:12
Measurement of CP violation in $B_s^0 \to \phi \phi$ decays / LHCb collaboration
A measurement of the decay time dependent $CP$-violating asymmetry in $B_s^0 \to \phi\phi$ decays is presented, along with measurements of the $T$-odd triple-product asymmetries. In this decay channel, the $CP$-violating weak phase arises from the interference between $B_s^0$-$\overline{B}_s^0$ mixing and the loop-induced decay amplitude. [...]
arXiv:1407.2222; CERN-PH-EP-2014-150; LHCB-PAPER-2014-026.- Geneva : CERN, 2014 - 28 p. - Published in : Phys. Rev. D 90 (2014) 052011 Fulltext: PDF; Related data file(s): ZIP; External link: Preprint

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2014-07-10
05:12
Measurement of the ratio of $B_c^+$ branching fractions to $J/\psi\pi^+$ and $J/\psi\mu^+\nu_\mu$ final states / LHCb collaboration
The first measurement that relates semileptonic and hadronic decay rates of the $B_c^+$ meson is performed using proton-proton collision data corresponding to 1.0 fb$^{-1}$ of integrated luminosity collected with the LHCb detector. The measured value of the ratio of branching fractions, ${\cal B}(B_c^+ \to J/\psi \pi^+)/{\cal B}(B_c^+\to J/\psi\mu^+\nu_\mu)=0.0469 \pm 0.0028 (stat.) \pm 0.0046 (syst.)$, is at the lower end of available theoretical predictions..
arXiv:1407.2126; LHCB-PAPER-2014-025; CERN-PH-EP-2014-163.- Geneva : CERN, 2014 - 20 p. - Published in : Phys. Rev. D 90 (2014) 032009 Fulltext: PDF; Related data file(s): ZIP; External link: Preprint

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2014-07-01
20:29
Search for pair-produced third-generation squarks decaying via charm quarks or in compressed supersymmetric scenarios in $pp$ collisions at $\sqrt{s}=8$ TeV with the ATLAS detector / ATLAS Collaboration
Results of a search for supersymmetry via direct production of third-generation squarks are reported, using $20.3$ fb$^{-1}$ of proton-proton collision data at $\sqrt{s}$=8 TeV recorded by the ATLAS experiment at the LHC in 2012. Two different analysis strategies based on monojet-like and $c$-tagged event selections are carried out to optimize the sensitivity for direct top squark pair production in the decay channel to a charm quark and the lightest neutralino ($\tilde{t}_1 \to c + \tilde{\chi}_{1}^{0}$) across the top squark--neutralino mass parameter space. [...]
arXiv:1407.0608; CERN-PH-EP-2014-141.- Geneva : CERN, 2014 - 35 p. - Published in : Phys. Rev. D 90 (2014) 052008 Fulltext: PDF; External links: Previous draft version; Preprint

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2014-06-30
22:53
Measurement of top quark-antiquark pair production in association with a W or Z boson in pp collisions at $\sqrt{s}$ = 8 TeV / CMS Collaboration
A measurement of the cross section for the production of top quark-antiquark pairs ($t\bar{t}$) in association with a vector boson V (W or Z) in proton-proton collisions at $\sqrt{s}$ = 8 TeV is presented. The results are based on a dataset corresponding to an integrated luminosity of 19.5 fb$^{-1}$ recorded with the CMS detector at the LHC. [...]
arXiv:1406.7830; CERN-PH-EP-2014-136; CMS-TOP-12-036.- Geneva : CERN, 2014 - 37 p. - Published in : Eur. Phys. J. C 74 (2014) 3060 Fulltext: PDF; External link: Preprint

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2014-06-30
04:06
Effective lifetime measurements in the $B_{s}^{0} \rightarrow K^{+}K^{-}$, $B^{0} \rightarrow K^{+}\pi^{-}$ and $B_{s}^{0} \rightarrow \pi^{+}K^{-}$ decays / LHCb collaboration
Measurements of the effective lifetimes in the $B_{s}^{0} \rightarrow K^{+}K^{-}$, $B^{0} \rightarrow K^{+}\pi^{-}$ and $B_{s}^{0} \rightarrow \pi^{+}K^{-}$ decays are presented using $1.0~\mathrm{fb^{-1}}$ of $pp$ collision data collected at a centre-of-mass energy of 7 TeV by the LHCb experiment. The analysis uses a data-driven approach to correct for the decay time acceptance. [...]
arXiv:1406.7204; CERN-PH-EP-2014-127; LHCB-PAPER-2014-011.- Geneva : CERN, 2014 - 12 p. - Published in : Phys. Lett. B 736 (2014) 446-454 Fulltext: PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP; External link: Preprint

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