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PH-EP Articles

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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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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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2014-12-04
15:27
Measurement of the transverse polarization of $\Lambda$ and $\bar{\Lambda}$ hyperons produced in proton--proton collisions at $\sqrt{s}$=7 TeV using the ATLAS detector / ATLAS Collaboration
The transverse polarization of $\Lambda$ and $\bar\Lambda$ hyperons produced in proton--proton collisions at a center-of-mass energy of 7 TeV is measured. The analysis uses 760 $\mu$b$^{-1}$ of minimum bias data collected by the ATLAS detector at the LHC in the year 2010. [...]
arXiv:1412.1692; CERN-PH-EP-2014-258.- Geneva : CERN, 2015 - 10 p. - Published in : Phys. Rev. D 91 (2015) 032004 Fulltext: PDF; External links: Previous draft version; Preprint

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2014-12-03
10:12
Measurements of differential and double-differential Drell-Yan cross sections in proton-proton collisions at $\sqrt{s}$ = 8 TeV / CMS Collaboration
Measurements of the differential and double-differential Drell-Yan cross sections in the dielectron and dimuon channels are presented. They are based on proton-proton collision data at $\sqrt{s}$ = 8 TeV recorded with the CMS detector at the LHC and corresponding to an integrated luminosity of 19.7 fb$^{-1} $. [...]
arXiv:1412.1115; CMS-SMP-14-003; CERN-PH-EP-2014-289.- Geneva : CERN, 2015 - 39 p. - Published in : Eur. Phys. J. C 75 (2015) 147 Fulltext: PDF; Springer Open Access article: PDF; External link: Preprint

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2014-11-27
08:06
Measurement of the lifetime of the $B_c^+$ meson using the $B_c^+ \rightarrow J/\psi\pi^+$ decay mode / LHCb collaboration
The difference in total widths between the $B_c^+$ and $B^+$ mesons is measured using 3.0fb$^{-1}$ of data collected by the LHCb experiment in 7 and 8 TeV centre-of-mass energy proton-proton collisions at the LHC. Through the study of the time evolution of $B_c^+ \rightarrow J/\psi \pi^+$ and $B^+\rightarrow J/\psi K^+$ decays, the width difference is measured to be $ \Delta\Gamma \equiv \Gamma_{B_c^+} - \Gamma_{B^+} = 4.46 \pm 0.14 \pm 0.07mm^{-1}c,$ where the first uncertainty is statistical and the second systematic. [...]
arXiv:1411.6899; CERN-PH-EP-2014-283; LHCB-PAPER-2014-060.- Geneva : CERN, 2015 - 19 p. - Published in : Phys. Lett. B 742 (2015) 29-37 Elsevier Open Access article : PDF; Fulltext: PDF; Related data file(s): ZIP; External link: Preprint

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2014-11-25
10:28
Search for long-lived neutral particles decaying to quark-antiquark pairs in proton-proton collisions at $\sqrt{s}$ = 8 TeV / CMS Collaboration
A search is performed for long-lived massive neutral particles decaying to quark-antiquark pairs. The experimental signature is a distinctive topology of a pair of jets, originating at a secondary vertex. [...]
arXiv:1411.6530; CMS-EXO-12-038; CERN-PH-EP-2014-256.- Geneva : CERN, 2015 - 35 p. - Published in : Phys. Rev. D 91 (2015) 012007 Fulltext: PDF; External link: Preprint

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2014-11-24
17:23
Searches for heavy long-lived charged particles with the ATLAS detector in proton--proton collisions at $\sqrt{s}$ = 8 TeV / ATLAS Collaboration
Searches for heavy long-lived charged particles are performed using a data sample of 19.8 fb$^{-1}$ from proton--proton collisions at a centre-of-mass energy of $\sqrt{s}$ = 8 TeV collected by the ATLAS detector at the Large Hadron Collider. No excess is observed above the estimated background and limits are placed on the mass of long-lived particles in various supersymmetric models. [...]
arXiv:1411.6795; CERN-PH-EP-2014-252.- Geneva : CERN, 2015 - 37 p. - Published in : J. High Energy Phys. 01 (2015) 068 Fulltext: PDF; Springer Open Access article: PDF; External links: Previous draft version; Preprint

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2014-11-21
22:07
Search for disappearing tracks in proton-proton collisions at $\sqrt{s}$ = 8 TeV / CMS Collaboration
A search is presented for long-lived charged particles that decay within the CMS detector and produce the signature of a disappearing track. Disappearing tracks are identified as those with little or no associated calorimeter energy deposits and with missing hits in the outer layers of the tracker. [...]
arXiv:1411.6006; CMS-EXO-12-034; CERN-PH-EP-2014-273.- Geneva : CERN, 2015 - 37 p. - Published in : J. High Energy Phys. 01 (2015) 096 Fulltext: PDF; Springer Open Access article: PDF; External link: Preprint

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2014-11-19
09:27
Observation of two new $\Xi_b^-$ baryon resonances / LHCb collaboration
Two structures are observed close to the kinematic threshold in the $\Xi_b^0\pi^-$ mass spectrum in a sample of proton-proton collision data, corresponding to an integrated luminosity of 3.0 fb$^{-1}$ recorded by the LHCb experiment. In the quark model, two baryonic resonances with quark content $bds$ are expected in this mass region: the spin-parity $J^P = \frac{1}{2}^+$ and $J^P=\frac{3}{2}^+$ states, denoted $\Xi_b^{\prime -}$ and $\Xi_b^{*-}$. [...]
arXiv:1411.4849; CERN-PH-EP-2014-279; LHCB-PAPER-2014-061.- Geneva : CERN, 2015 - 17 p. - Published in : Phys. Rev. Lett. 114 (2015) 062004 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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2014-11-13
07:50
Precision measurement of $CP$ violation in $B_s^0 \to J/\psi K^+K^-$ decays / LHCb Collaboration
The time-dependent $CP$ asymmetry in $B_s^0 \to J/\psi K^+K^-$ decays is measured using $pp$ collision data, corresponding to an integrated luminosity of $3.0$fb$^{-1}$, collected with the LHCb detector at centre-of-mass energies of $7$ and $8$TeV. In a sample of 96 000 $B_s^0 \to J/\psi K^+K^-$ decays, the $CP$-violating phase $\phi_s$ is measured, as well as the decay widths $\Gamma_{L}$ and $\Gamma_{H}$ of the light and heavy mass eigenstates of the $B_s^0-\bar{B}_s^0$ system. [...]
arXiv:1411.3104; LHCB-PAPER-2014-059; CERN-PH-EP-2014-271.- Geneva : CERN, 2015 - 19 p. - Published in : Phys. Rev. Lett. 114 (2015) 041801 Fulltext: PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP; External link: Preprint

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