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PH-EP Articles

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2015-02-16
08:47
Search for a CP-odd Higgs boson decaying to $Zh$ in $pp$ collisions at $\sqrt{s} = 8$ TeV with the ATLAS detector / ATLAS Collaboration
A search for a heavy, CP-odd Higgs boson, $A$, decaying into a $Z$ boson and a 125 GeV Higgs boson, $h$, with the ATLAS detector at the LHC is presented. The search uses proton--proton collision data at a centre-of-mass energy of 8 TeV corresponding to an integrated luminosity of 20.3 fb$^{-1}$. [...]
arXiv:1502.04478; CERN-PH-EP-2015-013.- Geneva : CERN, 2015 - 30 p. 16 Feb 2015 - Published in : Phys. Lett. B 744 (2015) 163-183 Fulltext: PDF; External links: Previous draft version; Preprint

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2015-02-01
21:05
Search for supersymmetry using razor variables in events with b-tagged jets in pp collisions at $\sqrt{s}$ = 8 TeV / CMS Collaboration
An inclusive search for supersymmetry in events with at least one bottom-quark jet is performed using proton-proton collision data collected by the CMS experiment in 2012 at a center-of-mass energy of 8 TeV. The data set size corresponds to an integrated luminosity of 19.3 fb$^{-1}$. [...]
arXiv:1502.00300; CERN-PH-EP-2015-005; CMS-SUS-13-004.- Geneva : CERN, 2015 - 45 p. - Published in : Phys. Rev. D 91 (2015) 052018 Fulltext: PDF; External link: Preprint

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2015-01-27
17:11
Measurement of indirect CP asymmetries in $D^0 \to K^-K^+$ and $D^0 \to \pi^-\pi^+$ decays / LHCb Collaboration
Time-dependent $CP$ asymmetries in the decay rates of the singly Cabibbo-suppressed decays $D^0\rightarrow K^-K^+$ and $D^0\rightarrow \pi^-\pi^+$ are measured in $pp$ collision data corresponding to an integrated luminosity of 3.0 fb$^{-1}$ collected by the LHCb experiment. The $D^0$ mesons are produced in semileptonic $b$-hadron decays, where the charge of the accompanying muon is used to determine the initial state as $D^0$ or $\bar{D}^0$. [...]
arXiv:1501.06777; LHCB-PAPER-2014-069; CERN-PH-EP-2015-008.- Geneva : CERN, 2015 - 20 p. - Published in : J. High Energy Phys. 04 (2015) 043 Fulltext: PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP; External link: Preprint

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2015-01-22
23:16
Search for decays of stopped long-lived particles produced in proton-proton collisions at $\sqrt{s}$ = 8 TeV / CMS Collaboration
A search has been performed for long-lived particles that could have come to rest within the CMS detector, using the time intervals between LHC beam crossings. The existence of such particles could be deduced from observation of their decays via energy deposits in the CMS calorimeter appearing at times that are well separated from any proton-proton collisions. [...]
arXiv:1501.05603; CERN-PH-EP-2015-002; CMS-EXO-12-036.- Geneva : CERN, 2015 - 33 p. - Published in : Eur. Phys. J. C 75 (2015) 151 Fulltext: PDF; External link: Preprint

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2015-01-19
08:12
Search for pair-produced long-lived neutral particles decaying in the ATLAS hadronic calorimeter in $pp$ collisions at $\sqrt{s}$ = 8 TeV / ATLAS Collaboration
The ATLAS detector at the Large Hadron Collider at CERN is used to search for the decay of a scalar boson to a pair of long-lived particles, neutral under the Standard Model gauge group, in 20.3 fb$^{-1}$ of data collected in proton--proton collisions at $\sqrt{s}$ = 8 TeV. This search is sensitive to long-lived particles that decay to Standard Model particles producing jets at the outer edge of the ATLAS electromagnetic calorimeter or inside the hadronic calorimeter. [...]
arXiv:1501.04020; CERN-PH-EP-2014-228.- 2015 - 10 p. - Published in : Phys. Lett. B 743 (2015) 15-34 Elsevier Open Access article : PDF; Fulltext: PDF; External link: Preprint

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2015-01-18
14:45
Search for resonances and quantum black holes using dijet mass spectra in proton-proton collisions at $\sqrt{s}$ = 8 TeV / CMS Collaboration
A search for resonances and quantum black holes is performed using the dijet mass spectra measured in proton-proton collisions at $\sqrt{s}$ = 8 TeV with the CMS detector at the LHC. The data set corresponds to an integrated luminosity of 19.7 fb$^{-1}$. [...]
arXiv:1501.04198; CERN-PH-EP-2014-300; CMS-EXO-12-059.- Geneva : CERN, 2015 - 45 p. - Published in : Phys. Rev. D 91 (2015) 052009 Fulltext: PDF; External link: Preprint

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2015-01-13
21:18
Search for Higgs and $Z$ Boson Decays to $J/\psi\gamma$ and $\Upsilon(nS)\gamma$ with the ATLAS Detector / ATLAS Collaboration
A search for the decays of the Higgs and $Z$ bosons to $J/\psi\gamma$ and $\Upsilon(nS)\gamma$ ($n=1,2,3$) is performed with $pp$ collision data samples corresponding to integrated luminosities of up to $20.3\mathrm{fb}^{-1}$ collected at $\sqrt{s}=8\mathrm{TeV}$ with the ATLAS detector at the CERN Large Hadron Collider. No significant excess of events is observed above expected backgrounds and 95\% CL upper limits are placed on the branching fractions. [...]
arXiv:1501.03276; CERN-PH-EP-2014-294.- Geneva : CERN, 2015 - 20 p. - Published in : Phys. Rev. Lett. 114 (2015) 121801 Fulltext: PDF; External links: Previous draft version; Preprint

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2014-12-22
07:58
Study of the rare $B_s^0$ and $B^0$ decays into the $\pi^+\pi^-\mu^+\mu^-$ final state / LHCb collaboration
A search for the rare decays $B_s^0 \to \pi^+\pi^-\mu^+\mu^-$ and $B^0 \to \pi^+\pi^-\mu^+\mu^-$ is performed in a data set corresponding to an integrated luminosity of 3.0 fb$^{-1}$ collected by the LHCb detector in proton-proton collisions at centre-of-mass energies of 7 and 8 TeV. Decay candidates with pion pairs that have invariant mass in the range 0.5-1.3 GeV/$c^2$ and with muon pairs that do not originate from a resonance are considered. [...]
arXiv:1412.6433; CERN-PH-EP-2014-296; LHCB-PAPER-2014-063.- Geneva : CERN, 2015 - 21 p. - Published in : Phys. Lett. B 743 (2015) 46 Fulltext: PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP; External link: Preprint

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2014-12-22
07:58
LHCb Detector Performance / LHCb collaboration
The LHCb detector is a forward spectrometer at the Large Hadron Collider (LHC) at CERN. The experiment is designed for precision measurements of CP violation and rare decays of beauty and charm hadrons. [...]
arXiv:1412.6352; CERN-PH-EP-2014-290; LHCB-DP-2014-002; CERN-LHCB-DP-2014-002.- Geneva : CERN, 2015 - 82 p. - Published in : Int. J. Mod. Phys. A 30 (2015) 1530022 Fulltext: PDF; External link: Preprint

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2014-12-19
18:48
Search for physics beyond the standard model in dilepton mass spectra in proton-proton collisions at $\sqrt{s}$ = 8 TeV / CMS Collaboration
Dimuon and dielectron mass spectra, obtained from data resulting from proton-proton collisions at 8 TeV and recorded by the CMS experiment, are used to search for both narrow resonances and broad deviations from standard model predictions. The data correspond to an integrated luminosity of 20.6 (19.7) fb$^{-1}$ for the dimuon (dielectron) channel. [...]
arXiv:1412.6302; CERN-PH-EP-2014-272; CMS-EXO-12-061.- Geneva : CERN, 2015 - 47 p. - Published in : J. High Energy Phys. 04 (2015) 025 Fulltext: PDF; Springer Open Access article: PDF; External link: Preprint

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