CERN Accelerating science

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1.
Grid technologies in SPbSU long-range correlations analysis and MC simulations for ALICE / Altsybeev, I G (St. Petersburg State U.) ; Feofilov, G A (St. Petersburg State U.) ; Kompaniets, M V (St. Petersburg State U.) ; Kovalenko, V N (St. Petersburg State U.) ; Vechernin, V V (St. Petersburg State U.) ; Vorobyev, I S (St. Petersburg State U.) ; Zarochentsev, A K (St. Petersburg State U.)
Studies of long-range correlations within the physics program of ALICE [1] require a high accuracy statistical analysis of experimental data. In this report, examples of Grid technologies used for the analysis of several types of correlations in proton-proton and Pb-Pb collisions in ALICE are presented. [...]
2012 - 5 p. - Published in : (2012) , pp. 18-22 Fulltext: PDF; External link: Fulltext
In : 5th International Conference "Distributed Computing and Grid-technologies in Science and Education", Dubna, Russian Federation, 16 - 20 Jul 2012, pp.18-22
2.
Integration of XRootD into the cloud infrastructure for ALICE data analysis / Kompaniets, Mikhail (St. Petersburg State U.) ; Shadura, Oksana (CERN ; Kiev Polytechnic Inst. ; BITP, Kiev) ; Svirin, Pavlo (CERN ; Kiev Polytechnic Inst.) ; Yurchenko, Volodymyr (Kiev Polytechnic Inst. ; BITP, Kiev) ; Zarochentsev, Andrey (St. Petersburg State U.)
Cloud technologies allow easy load balancing between different tasks and projects. From the viewpoint of the data analysis in the ALICE experiment, cloud allows to deploy software using Cern Virtual Machine (CernVM) and CernVM File System (CVMFS), to run different (including outdated) versions of software for long term data preservation and to dynamically allocate resources for different computing activities, e.g. [...]
2015 - 8 p. - Published in : J. Phys.: Conf. Ser. 664 (2015) 022036 IOP Open Access article: PDF;
In : 21st International Conference on Computing in High Energy and Nuclear Physics, Okinawa, Japan, 13 - 17 Apr 2015, pp.022036
3.
Multiplicity dependence of two-particle azimuthal correlations in pp collisions at the LHC / ALICE Collaboration
We present the measurements of particle pair yields per trigger particle obtained from di-hadron azimuthal correlations in pp collisions at $\sqrt{s}$=0.9, 2.76, and 7 TeV recorded with the ALICE detector. The yields are studied as a function of the charged particle multiplicity. [...]
arXiv:1307.1249; CERN-PH-EP-2013-107; CERN-PH-EP-2013-107.- Geneva : CERN, 2013 - 42 p. - Published in : JHEP 09 (2013) 049 Fulltext: arXiv:1307.1249 - PDF; CERN-PH-EP-2013-107 - PDF; Springer Open Access article: PDF; External link: Preprint
4.
Directed flow of charged particles at mid-rapidity relative to the spectator plane in Pb-Pb collisions at $\sqrt{s_{NN}}$=2.76 TeV / ALICE Collaboration
The directed flow of charged particles at midrapidity is measured in Pb-Pb collisions at $\sqrt{s_{NN}}$=2.76 TeV relative to the collision plane defined by the spectator nucleons. Both, the rapidity odd ($v_1^{odd}$) and even ($v_1^{even}$) directed flow components are reported. [...]
arXiv:1306.4145; CERN-PH-EP-2013-100; CERN-PH-EP-2013-100.- Geneva : CERN, 2013-12-06 - 11 p. - Published in : Phys. Rev. Lett. 111 (2013) 232302 APS Open Access article: PDF; Draft (restricted): PDF; Fulltext: CERN-PH-EP-2013-100 - PDF; arXiv:1306.4145 - PDF;
5.
Charmonium and $e^+e^-$ pair photoproduction at mid-rapidity in ultra-peripheral Pb-Pb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV / ALICE Collaboration
The ALICE Collaboration at the LHC has measured the $J/\psi$ and $\psi$' photoproduction at mid-rapidity in ultra-peripheral Pb-Pb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV. The charmonium is identified via its leptonic decay for events where the hadronic activity is required to be minimal. [...]
arXiv:1305.1467; CERN-PH-EP-2013-066; CERN-PH-EP-2013-066.- 2013-11-09 - 26 p. - Published in : Eur. Phys. J. C 73 (2013) 2617 Fulltext: PDF; Springer Open Access article: PDF; External link: Preprint
6.
D meson elliptic flow in non-central Pb-Pb collisions at $\sqrt{s_{NN}}$ = 2.76TeV / ALICE Collaboration
Azimuthally anisotropic distributions of $D^0, D^+$ and $D^{*+}$ mesons were studied in the central rapidity region (|y| < 0.8) in Pb-Pb collisions at a centre-of-mass energy $\sqrt{s_{NN}}$ = 2.76 TeV per nucleon-nucleon collision, with the ALICE detector at the LHC. The second Fourier coefficient $\nu_2$ (commonly denoted elliptic flow) was measured in the centrality class 30-50% as a function of the D meson transverse momentum $p_T$, in the range 2-16 GeV/c. [...]
arXiv:1305.2707; CERN-PH-EP-2013-085; CERN-PH-EP-2013-085.- Geneva : CERN, 2013-09-05 - 11 p. - Published in : Phys. Rev. Lett. 111 (2013) 102301 APS Open Access article: PDF; Draft (restricted): PDF; Fulltext: arXiv:1305.2707 - PDF; CERN-PH-EP-2013-085 - PDF; External link: Preprint
7.
Performance of the ALICE VZERO system / ALICE Collaboration
ALICE is an LHC experiment devoted to the study of strongly interacting matter in proton--proton, proton--nucleus and nucleus--nucleus collisions at ultra-relativistic energies. The ALICE VZERO system, made of two scintillator arrays at asymmetric positions, one on each side of the interaction point, plays a central role in ALICE. [...]
arXiv:1306.3130; CERN-PH-EP-2013-082; CERN-PH-EP-2013-082.- Geneva : CERN, 2013 - 20 p. - Published in : JINST 8 (2013) P10016 Draft (restricted): PDF; Fulltext: CERN-PH-EP-2013-082 - PDF; arXiv:1306.3130 - PDF; IOP Open Access article: PDF; External link: Preprint
8.
Mid-rapidity anti-baryon to baryon ratios in pp collisions at $\sqrt{s}$ = 0.9, 2.76 and 7 TeV measured by ALICE / ALICE Collaboration
The ratios of yields of anti-baryons to baryons probes the mechanisms of baryon-number transport. Results for anti-proton/proton, anti-$\Lambda/\Lambda$, anti-$\Xi^{+}/\Xi^{-}$ and anti-$\Omega^{+}/\Omega^{-}$ in pp collisions at $\sqrt{s}$ = 0.9, 2.76 and 7 TeV, measured with the ALICE detector at the LHC, are reported. [...]
arXiv:1305.1562; CERN-PH-EP-2013-080; CERN-PH-EP-2013-080.- Geneva : CERN, 2013 - 33 p. - Published in : Eur. Phys. J. C 73 (2013) 2496 Draft (restricted): PDF; Fulltext: PDF; Springer Open Access article: PDF; External link: Preprint
9.
Centrality dependence of the pseudorapidity density distribution for charged particles in Pb-Pb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV / ALICE Collaboration
We present the first wide-range measurement of the charged-particle pseudorapidity density distribution, for different centralities (the 0-5%, 5-10%, 10-20%, and 20-30% most central events) in Pb-Pb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV at the LHC. The measurement is performed using the full coverage of the ALICE detectors, -5.0 < $\eta$ < 5.5, and employing a special analysis technique based on collisions arising from LHC ' satellite' bunches. [...]
arXiv:1304.0347; CERN-PH-EP-2013-045; CERN-PH-EP-2013-045.- Geneva : CERN, 2013-11-04 - 13 p. - Published in : Phys. Lett. B 726 (2013) 610-622 Draft (restricted): PDF; Elsevier Open Access article: PDF; Fulltext: CERN-PH-EP-2013-045 - PDF; arXiv:1304.0347 - PDF; External link: Rivet analyses reference
10.
J/$\psi$ Elliptic Flow in Pb-Pb Collisions at $\sqrt{s_{NN}}$=2.76 TeV / ALICE Collaboration
We report on the first measurement of inclusive J/$\psi$ elliptic flow, $v_2$, in heavy-ion collisions at the LHC. The measurement is performed with the ALICE detector in Pb-Pb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV in the rapidity range 2.5 < y < 4.0. [...]
arXiv:1303.5880; CERN-PH-EP-2013-042; CERN-PH-EP-2013-042.- Geneva : CERN, 2013-10-17 - 11 p. - Published in : Phys. Rev. Lett. 111 (2013) 162301 APS Open Access article: PDF; Draft (restricted): PDF; Fulltext: CERN-PH-EP-2013-042 - PDF; arXiv:1303.5880 - PDF; External link: Preprint

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