CERN Accelerating science

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1.
ALICE HLT high speed tracking on GPU / for the ALICE Collaboration
The on-line event reconstruction in ALICE is performed by the High Level Trigger, which should process up to 2000 events per second in proton-proton collisions and up to 300 central events per second in heavy-ion collisions, corresponding to an inp ut data stream of 30 GB/s. In order to fulfill the time requirements, a fast on-line tracker has been developed. [...]
2011 - Published in : IEEE Trans. Nucl. Sci. 58 (2011) 1845-1851
In : 17th IEEE NPSS Real Time Conference, Lisbon, Portugal, 24 - 28 May 2010, pp.1845-1851
2.
Event reconstruction performance of the ALICE High Level Trigger for p + p collisions / for the ALICE collaboration
The ALICE High Level Trigger comprises a large computing cluster, dedicated interfaces and software applications. It allows on-line event reconstruction of the full data stream of the ALICE experiment at up to 25 GByte/s. [...]
2011 - Published in : IEEE Trans. Nucl. Sci. 58 (2011) 1706-1713

In : 17th IEEE NPSS Real Time Conference, Lisbon, Portugal, 24 - 28 May 2010, pp.1706-1713
3.
Measurement of inelastic, single- and double-diffraction cross sections in proton-proton collisions at the LHC with ALICE / ALICE Collaboration
Measurements of cross sections of inelastic and diffractive processes in proton--proton collisions at LHC energies were carried out with the ALICE detector. The fractions of diffractive processes in inelastic collisions were determined from a study of gaps in charged particle pseudorapidity distributions: for single diffraction (diffractive mass $M_X < 200$ GeV/$c^2$) $\sigma_{\rm SD}/\sigma_{\rm INEL} = 0.21 \pm 0.03, 0.20^{+0.07}_{-0.08}$, and $0.20^{+0.04}_{-0.07}$, respectively at centre-of-mass energies $\sqrt{s} = 0.9, 2.76$, and 7 TeV; for double diffraction (for a pseudorapidity gap $\Delta\eta > 3$) $\sigma_{\rm DD}/\sigma_{\rm INEL} = 0.11 \pm 0.03, 0.12 \pm 0.05$, and $0.12^{+0.05}_{-0.04}$, respectively at $\sqrt{s} = 0.9, 2.76$, and 7 TeV. [...]
arXiv:1208.4968; CERN-PH-EP-2012-238; CERN-PH-EP-2012-238.- Geneva : CERN, 2013-06-08 - 27 p. - Published in : Eur. Phys. J. C 73 (2013) 2456 CERN-PH-EP-2012-238: PDF; Draft (restricted): PDF; Fulltext: PDF; Springer Open Access article: PDF; External link: Rivet analyses reference
4.
Measurement of electrons from beauty hadron decays in pp collisions at $\sqrt{s}$ = 7 TeV / ALICE Collaboration
The production cross section of electrons from semileptonic decays of beauty hadrons was measured at mid-rapidity (|y| < 0.8) in the transverse momentum range 1 < pt < 8 Gev/c with the ALICE experiment at the CERN LHC in pp collisions at a center of mass energy $\sqrt{s}$ = 7 TeV using an integrated luminosity of 2.2 nb$^{-1}$. Electrons from beauty hadron decays were selected based on the displacement of the decay vertex from the collision vertex. [...]
arXiv:1208.1902; CERN-PH-EP-2012-229.- 2013-04-10 - 15 p.
Article from SCOAP3: PDF; Corrigendum: PDF; Elsevier Open Access article: PDF; Fulltext: PDF; External link: Preprint
5.
Centrality Dependence of Charged Particle Production at Large Transverse Momentum in Pb--Pb Collisions at $\sqrt{s_{\rm{NN}}} = 2.76$ TeV / ALICE Collaboration
The inclusive transverse momentum (pT) distributions of primary charged particles are measured in the pseudo-rapidity range |$\eta$| < 0.8 as a function of event centrality in Pb–Pb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV with ALICE at the LHC. The data are presented in the transverse momentum range 0.15 < pT < 50 GeV/c for nine centrality intervals from 70–80% to 0–5%. [...]
arXiv:1208.2711; CERN-PH-EP-2012-233; CERN-PH-EP-2012-233.- Geneva : CERN, 2013-03-13 - 18 p. - Published in : Phys. Lett. B 720 (2013) 52-62 Draft (restricted): PDF; Elsevier Open Access article: PDF; Fulltext: PDF; External link: Rivet analyses reference
6.
Pion, Kaon, and Proton Production in Central Pb--Pb Collisions at $\sqrt{s_{NN}}$ = 2.76 TeV / ALICE Collaboration
In this Letter we report the first results on $\pi^\pm$, K$^\pm$, p and pbar production at mid-rapidity (|y|<0.5) in central Pb-Pb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV, measured by the ALICE experiment at the LHC. The pT distributions and yields are compared to previous results at $\sqrt{s_{NN}}$ = 200 GeV and expectations from hydrodynamic and thermal models. [...]
arXiv:1208.1974; CERN-PH-EP-2012-230; CERN-PH-EP-2012-230.- Geneva : CERN, 2012 - 15 p. - Published in : Phys. Rev. Lett. 109 (2012) 252301 APS Open Access article: PDF; Draft (restricted): PDF; Fulltext: arXiv:1208.1974 - PDF; CERN-PH-EP-2012-230 - PDF; External link: Rivet analyses reference
7.
D$_s^+$ meson production at central rapidity in proton-proton collisions at $\sqrt{s}$ = 7 TeV / ALICE Collaboration
The pt-differential inclusive production cross section of the prompt charm-strange meson D$_s^+$ in the rapidity range |y|<0.5 was measured in proton--proton collisions at $\sqrt{s}$=7 TeV at the LHC using the ALICE detector. The analysis was performed on a data sample of 2.98 10$^8$ events collected with a minimum-bias trigger. [...]
arXiv:1208.1948; CERN-PH-EP-2012-227; CERN-PH-EP-2012-227.- Geneva : CERN, 2012-12-05 - 27 p. - Published in : Phys. Lett. B 718 (2012) 279-294 Draft (restricted): PDF; Elsevier Open Access article: PDF; Fulltext: arXiv:1208.1948 - PDF; CERN-PH-EP-2012-227 - PDF; External link: Preprint
8.
Production of $K*(892)^0$ and $\phi$(1020) in pp collisions at $\sqrt{s}$ =7 TeV / ALICE Collaboration
The production of K*(892)$^0$ and $\phi$(1020) in pp collisions at $\sqrt{s}$=7 TeV was measured by the ALICE experiment at the LHC. The yields and the transverse momentum spectra $d^2 N/dydp_T$ at midrapidity |y|<0.5 in the range 0 < $p_T$ < 6 GeV/c for K*(892)$^0$ and 0.4 < $p_T$ < 6 GeV/c for $\phi$(1020) are reported and compared to model predictions. [...]
arXiv:1208.5717; CERN-PH-EP-2012-221; CERN-PH-EP-2012-221.- Geneva : CERN, 2012-10-30 - 27 p. - Published in : Eur. Phys. J. C 72 (2012) 2183 Draft (restricted): PDF; Fulltext: CERN-PH-EP-2012-221 - PDF; arXiv:1208.5717 - PDF; Springer Open Access article: PDF; External link: DURHAM
9.
Net-Charge Fluctuations in Pb-Pb collisions at $\sqrt{s_{NN}}= 2.76$ TeV / ALICE Collaboration
We report the first measurement of the net-charge fluctuations in Pb-Pb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV, measured with the ALICE detector at the CERN Large Hadron Collider. The dynamical fluctuations per unit entropy are observed to decrease when going from peripheral to central collisions. [...]
arXiv:1207.6068; CERN-PH-EP-2012-212; CERN-PH-EP-2012-212.- Geneva : CERN, 2013-04-10 - 11 p. - Published in : Phys. Rev. Lett. 110 (2013) 152301 APS Open Access article: PDF; Draft (restricted): PDF; Fulltext: arXiv:1207.6068 - PDF; CERN-PH-EP-2012-212 - PDF; External link: Preprint
10.
Charge separation relative to the reaction plane in Pb-Pb collisions at $\sqrt{s_{NN}}$= 2.76 TeV / ALICE Collaboration
Measurements of charge dependent azimuthal correlations with the ALICE detector at the LHC are reported for Pb-Pb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV. Two- and three-particle charge-dependent azimuthal correlations in the pseudo-rapidity range $|\eta | < 0.8$ are presented as a function of the collision centrality, particle separation in pseudo-rapidity, and transverse momentum. [...]
arXiv:1207.0900; CERN-PH-EP-2012-183; CERN-PH-EP-2012-183.- Geneva : CERN, 2013-01-02 - 11 p. - Published in : Phys. Rev. Lett. 110 (2013) 012301 APS Open Access article: PDF; Fulltext: CERN-PH-EP-DRAFT-ALICE-2012-015 - PDF; arXiv:1207.0900 - PDF; External link: Preprint

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