First proton–proton collisions at the LHC as observed with the ALICE detector: measurement of the charged-particle pseudorapidity density at GeV The ALICE Collaboration, K. Aamodt, N. Abel, U. Abeysekara, A. Abrahantes Quintana, A. Acero, D. Adamová, M. M. Aggarwal, G. Aglieri Rinella, A. G. Agocs, [......], X. Zhang, D. Zhou, S. Zhou, J. Zhu, A. Zichichi, A. Zinchenko, G. Zinovjev, M. Zinovjev, Y. Zoccarato, V. Zycháček ABSTRACT: On 23rd November 2009, during the early commissioning of the CERN Large Hadron Collider (LHC), two counter-rotating proton bunches were circulated for the first time concurrently in the machine, at the LHC injection energy of 450GeV per beam. Although the proton intensity was very low, with only one...[more]04/2012; 65(1):111-125. · 3.63 Impact Factor

Production of pions, kaons and protons in pp collisions at with ALICE at the LHC The ALICE Collaboration, K. Aamodt, N. Abel, U. Abeysekara, A. Abrahantes Quintana, A. Abramyan, D. Adamová, M. M. Aggarwal, G. Aglieri Rinella, A. G. Agocs, [......], X. Zhang, D. Zhou, S. Zhou, J. Zhu, A. Zichichi, A. Zinchenko, G. Zinovjev, Y. Zoccarato, V. Zycháček,M. Zynovyev ABSTRACT: The production of π +, π −, K+, K−, p, and [`(p)]\overline{\mathrm{p}} at mid-rapidity has been measured in proton-proton collisions at Ös = 900GeV\sqrt{s} = 900~\mathrm{GeV} with the ALICE detector. Particle identification is performed using the specific energy loss in the inner tracking silicon de... [more] 04/2012; 71(6):1-22. · 3.63 Impact Factor

Strange particle production in proton–proton collisions at with ALICE at the LHC K. Aamodt, A. Abrahantes Quintana, D. Adamová, A. M. Adare, M. M. Aggarwal, G. Aglieri Rinella,A. G. Agocs, S. Aguilar Salazar, Z. Ahammed, N. Ahmad, [......], P. Zelnicek, A. Zenin, I. Zgura, M. Zhalov, X. Zhang, D. Zhou, A. Zichichi, G. Zinovjev,Y. Zoccarato, M. Zynovyev ABSTRACT: The production of mesons containing strange quarks φ and both singly and doubly strange baryons are measured at mid-rapidity in pp collisions at \sqrt{s}=0.9TeV{\rm TeV} with the ALICE experim... [more] 04/2012; 71(3):1-24. · 3.63 Impact Factor

Charged-particle multiplicity measurement in proton–proton collisions at and 2.36 TeV with ALICE at LHC The ALICE Collaboration, K. Aamodt, N. Abel, U. Abeysekara, A. Abrahantes Quintana, A. Abramyan, D. Adamová, M. M. Aggarwal, G. Aglieri Rinella, A. G. Agocs, [......], X. Zhang, D. Zhou, S. Zhou, J. Zhu, A. Zichichi,A. Zinchenko, G. Zinovjev, Y. Zoccarato, V. Zycháček, M. Zynovyev ABSTRACT: Charged-particle production was studied in proton–proton collisions collected at the LHC with the ALICE detector at centre-of-mass energies 0.9TeV and 2.36TeV in the pseudorapidity range |η|[more]04/2012; 68(1):89-108. · 3.63 Impact Factor

Centrality dependence of the charged-particle multiplicity density at midrapidity in Pb-Pb collisions at sqrt[s(NN)] = 2.76 TeV. K Aamodt, A Abrahantes Quintana, D Adamová, A M Adare, M M Aggarwal, G Aglieri Rinella, A G Agocs, S Aguilar Salazar, Z Ahammed, N Ahmad, [......], A Zenin,I Zgura, M Zhalov, X Zhang, D Zhou, X Zhu, A Zichichi, G Zinovjev, Y Zoccarato, M Zynovyev ABSTRACT: The centrality dependence of the charged-particle multiplicity density at midrapidity in Pb-Pb collisions at sqrt[s_{NN}]=2.76  TeV is presented. The charged-particle density normalized per participating nucleon pair increases by about a factor of 2 from peripheral (70%-80%) to central (0%-5%) colli... [more] Physical review letters. 01/2011; 106(3):032301. · 7.37 Impact Factor

Two-pion Bose-Einstein correlations in central PbPb collisions at sqrt(s_NN) = 2.76 TeV ALICE Collaboration, K. Aamodt, A. Abrahantes Quintana, D Adamová, A. M. Adare,M. M. Aggarwal, G. Aglieri Rinella, A. G. Agocs, S. Aguilar Salazar, Z. Ahammed, [......], A. Zenin, I. Zgura, M. Zhalov, X Zhang, D Zhou, X Zhu, A. Zichichi, G. Zinovjev, Y. Zoccarato, M. Zynovyev ABSTRACT: The first measurement of two-pion Bose--Einstein correlations in central PbPb collisions at sqrt(s_NN) = 2.76 TeV at the Large Hadron Collider is presented. We observe a growing trend with energy now not only for the longitudinal and the outward but also for the sideward pion source radius. The pion... [more] 12/2010;

Charged-particle multiplicity density at midrapidity in central Pb-Pb collisions at sqrt[S(NN)] = 2.76 TeV. K Aamodt, B Abelev, A Abrahantes Quintana, D Adamová, A M Adare, M M Aggarwal, G Aglieri Rinella, A G Agocs, S Aguilar Salazar, Z Ahammed, [......], P Zelnicek, A Zenin, I Zgura, M Zhalov, X Zhang, D Zhou, A Zichichi, G Zinovjev, Y Zoccarato, M Zynovyev ABSTRACT: The first measurement of the charged-particle multiplicity density at midrapidity in Pb-Pb collisions at a center-of-mass energy per nucleon pair √ S NN = 2.76 TeV is presented. For an event sample corresponding to the most central 5% of the hadronic cross section, the pseudorapidity density of prim... [more] Physical review letters. 12/2010; 105(25):252301. · 7.37 Impact Factor

Elliptic flow of charged particles in Pb-Pb collisions at sqrt[S(NN)] = 2.76 TeV. K Aamodt, B Abelev, A Abrahantes Quintana, D Adamová, A M Adare, M M Aggarwal, G Aglieri Rinella, A G Agocs, S Aguilar Salazar, Z Ahammed, [......], P Zelnicek, A Zenin, I Zgura, M Zhalov, X Zhang, D Zhou, A Zichichi, G Zinovjev, Y Zoccarato, M Zynovyev ABSTRACT: We report the first measurement of charged particle elliptic flow in Pb-Pb collisions at sqrt[S(NN)] =2.76 TeV with the ALICE detector at the CERN Large Hadron Collider. The measurement is performed in the central pseudorapidity region (|η|[more] Physical review letters. 12/2010; 105(25):252302. · 7.37 Impact Factor

Midrapidity antiproton-to-proton ratio in pp collisons at sqrt[s]=0.9 and 7 TeV measured by the ALICE experiment. K Aamodt, N Abel, U Abeysekara, A Abrahantes Quintana, A Abramyan, D Adamová, M M Aggarwal, G Aglieri Rinella, A G Agocs, S Aguilar Salazar, [......], X Zhang, D Zhou, S Zhou, J Zhu, A Zichichi, A Zinchenko, G Zinovjev, Y Zoccarato,V Zychácek, M Zynovyev ABSTRACT: The ratio of the yields of antiprotons to protons in pp collisions has been measured by the ALICE experiment at sqrt[s]=0.9 and 7 TeV during the initial running periods of the Large Hadron Collider. The measurement covers the transverse momentum interval 0.45[more] Physical review letters. 08/2010; 105(7):072002. · 7.37 Impact Factor

Transverse momentum spectra of charged particles in proton-proton collisions at $\sqrt{s} = 900$~GeV with ALICE at the LHC ALICE Collaboration, K. Aamodt, N. Abel, U. Abeysekara, A. Abrahantes Quintana,A. Abramyan, D. Adamova, M. M. Aggarwal, G. Aglieri Rinella, A. G. Agocs, [......], X Zhang, D Zhou, S Zhou, J Zhu, A. Zichichi, A Zinchenko, G. Zinovjev, Y. Zoccarato, V. Zychacek, M. Zynovyev ABSTRACT: The inclusive charged particle transverse momentum distribution is measured in proton-proton collisions at $\sqrt{s} = 900$~GeV at the LHC using the ALICE detector. The measurement is performed in the central pseudorapidity region $(|\eta|[more]07/2010;

Two-pion Bose-Einstein correlations in pp collisions at sqrt(s)=900 GeV K. Aamodt, N. Abel, U. Abeysekara, A. Abrahantes Quintana, A. Abramyan, D. Adamova, M. M. Aggarwal, G. Aglieri Rinella, A. G. Agocs, S. Aguilar Salazar, [......],X Zhang, D Zhou, S Zhou, J Zhu, A. Zichichi, A Zinchenko, G. Zinovjev, Y. Zoccarato, V. Zychacek, M. Zynovyev ABSTRACT: We report on the measurement of two-pion correlation functions from pp collisions at sqrt(s)=900 GeV performed by the ALICE experiment at the Large Hadron Collider. Our analysis shows an increase of the HBT radius with increasing event multiplicity, in line with other measurements done in particle- ... [more] 07/2010;

Charged-particle multiplicity measurement in proton-proton collisions at sqrt(s) = 7 TeV with ALICE at LHC K. Aamodt, N. Abel, U. Abeysekara, A. Abrahantes Quintana, A. Abramyan, D. Adamova, M. M. Aggarwal, G. Aglieri Rinella, A. G. Agocs, S. Aguilar Salazar, [......],X Zhang, D Zhou, S Zhou, J Zhu, A. Zichichi, A Zinchenko, G. Zinovjev, Y. Zoccarato, V. Zychacek, M. Zynovyev ABSTRACT: The pseudorapidity density and multiplicity distribution of charged particles produced in proton-proton collisions at the LHC, at a centre-of-mass energy sqrt(s) = 7 TeV, were measured in the central pseudorapidity region |eta| < 1. Comparisons are made with previous measurements at sqrt(s) = 0.9... [more]04/2010;

Charged-particle multiplicity measurement in proton-proton collisions at sqrt(s) = 0.9 and 2.36 TeV with ALICE at LHC K. Aamodt, N. Abel, U. Abeysekara, A. Abrahantes Quintana,A. Abramyan, D. Adamova, M. M. Aggarwal, G. Aglieri Rinella, A. G. Agocs, S. Aguilar Salazar, [......],X Zhang, D Zhou, S Zhou, J Zhu, A. Zichichi, A Zinchenko, G. Zinovjev, Y. Zoccarato, V. Zychacek, M. Zynovyev ABSTRACT: Charged-particle production was studied in proton-proton collisions collected at the LHC with the ALICE detector at centre-of-mass energies 0.9 TeV and 2.36 TeV in the pseudorapidity range |eta| < 1.4. In the central region (|eta| < 0.5), at 0.9 TeV, we measure charged-particle pseudorapidity ... [more] 04/2010;

First proton--proton collisions at the LHC as observed with the ALICE detector: measurement of the charged particle pseudorapidity density at sqrt(s) = 900 GeV The ALICE Collaboration, K. Aamodt, N. Abel, U. Abeysekara, A. Abrahantes Quintana, A. Acero, D. Adamova, M. M. Aggarwal, G. Aglieri Rinella, A. G. Agocs, [......], X Zhang, D Zhou, S Zhou, J Zhu, A. Zichichi, A Zinchenko, G. Zinovjev, M. Zinovjev, Y. Zoccarato, V. Zychacek ABSTRACT: On 23rd November 2009, during the early commissioning of the CERN Large Hadron Collider (LHC), two counter-rotating proton bunches were circulated for the first time concurrently in the machine, at the LHC injection energy of 450 GeV per beam. Although the proton intensity was very low, with only on... [more] 11/2009;

Suppression of Charged Particle Production at Large Transverse Momentum in Central Pb--Pb Collisions at $\sqrt{s_{NN}}$ = 2.76 TeV K. Aamodt, A. Abrahantes Quintana, D Adamová, A. M. Adare, M. M. Aggarwal, G. Aglieri Rinella, A. G. Agocs, S. Aguilar Salazar, Z. Ahammed, N Ahmad, [......], P. Zelnicek, A. Zenin, I. Zgura, M. Zhalov, X Zhang, D Zhou, A. Zichichi, G. Zinovjev,Y. Zoccarato, M. Zynovyev ABSTRACT: Inclusive transverse momentum spectra of primary charged particles in Pb-Pb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV have been measured by the ALICE Collaboration at the LHC. The data are presented for central and peripheral collisions, corresponding to 0-5% and 70-80% of the hadronic Pb-Pb cross se...[more]

Centrality dependence of the charged-particle multiplicity density at mid-rapidity in Pb-Pb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV K. Aamodt, A. Abrahantes Quintana, D Adamová, A. M. Adare, M. M. Aggarwal, G. Aglieri Rinella, A. G. Agocs, S. Aguilar Salazar, Z. Ahammed, N Ahmad, [......], P. Zelnicek, A. Zenin, I. Zgura, M. Zhalov, X Zhang, D Zhou, A. Zichichi, G. Zinovjev,Y. Zoccarato, M. Zynovyev ABSTRACT: The centrality dependence of the charged-particle multiplicity density at mid-rapidity in Pb-Pb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV is presented. The charged-particle density normalized per participating nucleon pair increases by about a factor 2 from peripheral (70-80%) to central (0-5%) colli... [more]

Strange particle production in proton-proton collisions at ?s = 0.9 TeV with ALICE at the LHC K. Aamodt, A. Abrahantes Quintana, D. Adamova, A. M. Adare, M. M. Aggarwal, G. Aglieri Rinella, A. G. Agocs, S. Aguilar Salazar, Z. Ahammed, N Ahmad, [......], A. Zenin, I. Zgura, M. Zhalov, X Zhang, D Zhou, X Zhu, A. Zichichi, G. Zinovjev, Y. Zoccarato, M. Zynovyev ABSTRACT: The production of mesons containing strange quarks ($\Kzs$, $\phi$) and both singly and doubly strange baryons ($\rmLambda$, $\rmAlambda$, and $\Xis$) are measured at central rapidity in pp collisions at $\sqrt{s}$ = 0.9 $\tev$ with the ALICE experiment at the LHC. The results are obtained from the ... [more]

Production of pions, kaons and protons in pp collisions at sqrt(s)= 900 GeV with ALICE at the LHC K. Aamodt, A. Abrahantes Quintana, D. Adamova, A. M. Adare, M. M. Aggarwal,G. Aglieri Rinella, A. G. Agocs, S. Aguilar Salazar, Z. Ahammed, N Ahmad, [......], A. Zenin, I. Zgura, M. Zhalov, X Zhang, D Zhou, X Zhu, A. Zichichi, G. Zinovjev, Y. Zoccarato, M. Zynovyev ABSTRACT: The production of pi+, pi-, K+, K-, p, and pbar at mid-rapidity has been measured in proton-proton collisions at sqrt(s) = 900 GeV with the ALICE detector. Particle identification is performed using the specific energy loss in the inner tracking silicon detector and the time projection chamber. In a... [more]

Femtoscopy of pp collisions at sqrt{s}=0.9 and 7 TeV at the LHC with two-pion Bose-Einstein correlations K. Aamodt, A. Abrahantes Quintana, D. Adamova, A. M. Adare, M. M. Aggarwal, G. Aglieri Rinella, A. G. Agocs, S. Aguilar Salazar, Z. Ahammed, N Ahmad, [......], A. Zenin, I. Zgura, M. Zhalov, X Zhang, D Zhou, X Zhu, A. Zichichi, G. Zinovjev, Y. Zoccarato, M. Zynovyev ABSTRACT: We report on the high statistics two-pion correlation functions from pp collisions at sqrt{s}=0.9 TeV and sqrt{s}=7 TeV, measured by the ALICE experiment at the Large Hadron Collider. The correlation functions as well as the extracted source radii scale with event multiplicity and pair momentum. Whe...[more]

Suppression of Charged Particle Production at Large Transverse Momentum in Central Pb--Pb Collisions at $\sqrt{s_{_{NN}}} = 2.76$ TeV K. Aamodt, A. Abrahantes Quintana, D. Adamova, A. M. Adare, M. M. Aggarwal, G. Aglieri Rinella, A. G. Agocs, S. Aguilar Salazar, Z. Ahammed, N Ahmad, [......], P. Zelnicek, A. Zenin, I. Zgura, M. Zhalov, X Zhang, D Zhou, A. Zichichi, G. Zinovjev,Y. Zoccarato, M. Zynovyev ABSTRACT: Inclusive transverse momentum spectra of primary charged particles in Pb-Pb collisions at $\sqrt{s_{_{NN}}}$ = 2.76 TeV have been measured by the ALICE Collaboration at the LHC. The data are presented for central and peripheral collisions, corresponding to 0-5% and 70-80% of the hadronic Pb-Pb cross...[more] Physics Letters B.

Strange particle production in proton-proton collisions at $\sqrt{s}$ = 0.9 TeV with ALICE at the LHC K. Aamodt, A. Abrahantes Quintana, D Adamová, A. M. Adare, M. M. Aggarwal,G. Aglieri Rinella, A. G. Agocs, S. Aguilar Salazar, Z. Ahammed, N Ahmad, [......], A. Zenin, I. Zgura, M. Zhalov, X Zhang, D Zhou, X Zhu, A. Zichichi, G. Zinovjev, Y. Zoccarato, M. Zynovyev ABSTRACT: The production of mesons containing strange quarks (K0 S, f ) and both singly and doubly strange baryons (L, L, and X−+X+) are measured at central rapidity in pp collisions at √s = 0.9 TeV with the ALICE experiment at the LHC. The results are obtained from the analysis of about 250 k minimum bias ev... [more]

Centrality Dependence of the Charged-Particle Multiplicity Density at Midrapidity in Pb-Pb Collisions at √sNN=2.76  TeV K. Aamodt, A. Abrahantes Quintana, D. Adamova, A. M. Adare, M. M. Aggarwal, G. Aglieri Rinella, A. G. Agocs, S. Aguilar Salazar, Z. Ahammed, N Ahmad, [......], A. Zenin, I. Zgura, M. Zhalov, X Zhang, D Zhou, X Zhu, A. Zichichi, G. Zinovjev, Y. Zoccarato, M. Zynovyev Physical Review Letters. 

Charged-particle multiplicity density at midrapidity in central Pb-Pb collisions at sqrt(sNN) = 2.76 TeV K. Aamodt, B. Abelev, A. Abrahantes Quintana, D. Adamova, A. M. Adare, M. M. Aggarwal, G. Aglieri Rinella, A. G. Agocs, S. Aguilar Salazar, Z. Ahammed, [......], P. Zelnicek, A. Zenin, I. Zgura, M. Zhalov, X Zhang, D Zhou, A. Zichichi, G. Zinovjev,Y. Zoccarato, M. Zynovyev ABSTRACT: The first measurement of the charged-particle multiplicity density at mid-rapidity in Pb-Pb collisions at a centre-of-mass energy per nucleon pair sqrt(sNN) = 2.76 TeV is presented. For an event sample corresponding to the most central 5% of the hadronic cross section the pseudo-rapidity density of ... [more] Physical Review Letters.