P. Reichelt

Publications (22)102.32 Total impact

• Article: Transverse Momentum Distribution and Nuclear Modification Factor of Charged Particles in p+Pb Collisions at sqrt[s_{NN}]=5.02 TeV.

  B Abelev, J Adam, D Adamová, A M Adare, M M Aggarwal, G Aglieri Rinella, M Agnello, A G Agocs, A Agostinelli, Z Ahammed, [......], D Zhou, X Zhu, J Zhu, H Zhu, A Zichichi, A Zimmermann, G Zinovjev, Y Zoccarato, M Zynovyev, M Zyzak
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  ABSTRACT: The transverse momentum (p_{T}) distribution of primary charged particles is measured in minimum bias (non-single-diffractive) p+Pb collisions at sqrt[s_{NN}]=5.02 TeV with the ALICE detector at the LHC. The p_{T} spectra measured near central rapidity in the range 0.5<p_{T}<20 GeV/c exhibit a weak pseudorapidity dependence. The nuclear modification factor R_{pPb} is consistent with unity for p_{T} above 2 GeV/c. This measurement indicates that the strong suppression of hadron production at high p_{T} observed in Pb+Pb collisions at the LHC is not due to an initial-state effect. The measurement is compared to theoretical calculations.
  Physical Review Letters 02/2013; 110(8):082302. · 7.37 Impact Factor
• Source

  Available from: Varlen Grabski

  Article: Pseudorapidity Density of Charged Particles in p+Pb Collisions at sqrt[s_{NN}]=5.02 TeV.

  B Abelev, J Adam, D Adamová, A M Adare, M M Aggarwal, G Aglieri Rinella, M Agnello, A G Agocs, A Agostinelli, Z Ahammed, [......], Y Zhou, J Zhu, H Zhu, X Zhu, A Zichichi, A Zimmermann, G Zinovjev, Y Zoccarato, M Zynovyev, M Zyzak
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  ABSTRACT: The charged-particle pseudorapidity density measured over four units of pseudorapidity in nonsingle-diffractive p+Pb collisions at a center-of-mass energy per nucleon pair sqrt[s_{NN}]=5.02 TeV is presented. The average value at midrapidity is measured to be 16.81±0.71 (syst), which corresponds to 2.14±0.17 (syst) per participating nucleon, calculated with the Glauber model. This is 16% lower than in nonsingle-diffractive pp collisions interpolated to the same collision energy and 84% higher than in d+Au collisions at sqrt[s_{NN}]=0.2 TeV. The measured pseudorapidity density in p+Pb collisions is compared to model predictions and provides new constraints on the description of particle production in high-energy nuclear collisions.
  Physical Review Letters 01/2013; 110(3):032301. · 7.37 Impact Factor
• Article: Charge separation relative to the reaction plane in Pb-Pb collisions at sqrt[s_{NN}]=2.76 TeV.

  B Abelev, J Adam, D Adamová, A M Adare, M M Aggarwal, G Aglieri Rinella, A G Agocs, A Agostinelli, S Aguilar Salazar, Z Ahammed, [......], D Zhou, F Zhou, J Zhu, X Zhu, A Zichichi, A Zimmermann, G Zinovjev, Y Zoccarato, M Zynovyev, M Zyzak
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  ABSTRACT: 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 pseudorapidity range |η|<0.8 are presented as a function of the collision centrality, particle separation in pseudorapidity, and transverse momentum. A clear signal compatible with a charge-dependent separation relative to the reaction plane is observed, which shows little or no collision energy dependence when compared to measurements at RHIC energies. This provides a new insight for understanding the nature of the charge-dependent azimuthal correlations observed at RHIC and LHC energies.
  Physical Review Letters 01/2013; 110(1):012301. · 7.37 Impact Factor
• Article: Measurement of the Cross Section for Electromagnetic Dissociation with Neutron Emission in Pb-Pb Collisions at sqrt[s_{NN}]=2.76 TeV.

  B Abelev, J Adam, D Adamová, A M Adare, M M Aggarwal, G Aglieri Rinella, A G Agocs, A Agostinelli, S Aguilar Salazar, Z Ahammed, [......], D Zhou, F Zhou, Y Zhou, J Zhu, X Zhu, A Zichichi, A Zimmermann, G Zinovjev, Y Zoccarato, M Zynovyev
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  ABSTRACT: The first measurement of neutron emission in electromagnetic dissociation of ^{208}Pb nuclei at the LHC is presented. The measurement is performed using the neutron zero degree calorimeters of the ALICE experiment, which detect neutral particles close to beam rapidity. The measured cross sections of single and mutual electromagnetic dissociation of Pb nuclei at sqrt[s_{NN}]=2.76 TeV with neutron emission are σ_{singleEMD}=187.4±0.2(stat)_{-11.2}^{+13.2}(syst) b and σ_{mutualEMD}=5.7±0.1(stat)±0.4(syst) b, respectively. The experimental results are compared to the predictions from a relativistic electromagnetic dissociation model.
  Physical Review Letters 12/2012; 109(25):252302. · 7.37 Impact Factor
• Source

  Available from: C. Oppedisano

  Article: Pion, Kaon, and Proton Production in Central Pb-Pb Collisions at sqrt[s_{NN}]=2.76 TeV.

  B Abelev, J Adam, D Adamová, A M Adare, M M Aggarwal, G Aglieri Rinella, A G Agocs, A Agostinelli, S Aguilar Salazar, Z Ahammed, [......], Y Zhou, F Zhou, J Zhu, X Zhu, A Zichichi, A Zimmermann, G Zinovjev, Y Zoccarato, M Zynovyev, M Zyzak
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  ABSTRACT: In this Letter we report the first results on π^{±}, K^{±}, p, and p[over ¯] production at midrapidity (|y|<0.5) in central Pb-Pb collisions at sqrt[s_{NN}]=2.76 TeV, measured by the ALICE experiment at the LHC. The p_{T} distributions and yields are compared to previous results at sqrt[s_{NN}]=200 GeV and expectations from hydrodynamic and thermal models. The spectral shapes indicate a strong increase of the radial flow velocity with sqrt[s_{NN}], which in hydrodynamic models is expected as a consequence of the increasing particle density. While the K/π ratio is in line with predictions from the thermal model, the p/π ratio is found to be lower by a factor of about 1.5. This deviation from thermal model expectations is still to be understood.
  Physical Review Letters 12/2012; 109(25):252301. · 7.37 Impact Factor
• Source

  Available from: Varlen Grabski

  Article: J/ψ production as a function of charged particle multiplicity in pp collisions at s =7 TeV

  ALICE Collaboration, B. Abelev, J. Adam, D. Adamová, A. M. Adare, M. M. Aggarwal, G. Aglieri Rinella, A. G. Agocs, A. Agostinelli, S. Aguilar Salazar, [......], X. Zhang, Y. Zhou, D. Zhou, F. Zhou, X. Zhu, A. Zichichi, A. Zimmermann, G. Zinovjev, Y. Zoccarato, M. Zynovyev
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  ABSTRACT: The ALICE Collaboration reports the measurement of the relative J/ψ yield as a function of charged particle pseudorapidity density dNch/dη in pp collisions at s=7 TeV at the LHC. J/ψ particles are detected for pt>0, in the rapidity interval |y|<0.9 via decay into e+e-, and in the interval 2.5<y<4.0 via decay into μ+μ- pairs. An approximately linear increase of the J/ψ yields normalized to their event average (dN/dy)/<dN/dy> with (dNch/dη)/<dNch/dη> is observed in both rapidity ranges, where dNch/dη is measured within |η|<1 and pt>0. In the highest multiplicity interval with <dNch/dη(bin)>=24.1, corresponding to four times the minimum bias multiplicity density, an enhancement relative to the minimum bias J/ψ yield by a factor of about 5 at 2.5<y<4 (8 at |y|<0.9) is observed.
  Physics Letters B 05/2012; 712:165-175. · 3.95 Impact Factor
• Article: Inclusive J/psi production in pp collisions at sqrt(s) = 2.76 TeV

  ALICE Collaboration, B. Abelev, J. Adam, D. Adamova, A. M. Adare, M. M. Aggarwal, G. Aglieri Rinella, A. G. Agocs, A. Agostinelli, S. Aguilar Salazar, [......], X. Zhang, D. Zhou, Y. Zhou, F. Zhou, X. Zhu, A. Zichichi, A. Zimmermann, G. Zinovjev, Y. Zoccarato, M. Zynovyev
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  ABSTRACT: The ALICE Collaboration has measured inclusive J/psi production in pp collisions at a center of mass energy sqrt(s)=2.76 TeV at the LHC. The results presented in this Letter refer to the rapidity ranges |y|<0.9 and 2.5<y<4 and have been obtained by measuring the electron and muon pair decay channels, respectively. The integrated luminosities for the two channels are L^e_int=1.1 nb^-1 and L^mu_int=19.9 nb^-1, and the corresponding signal statistics are N_J/psi^e+e-=59 +/- 14 and N_J/psi^mu+mu-=1364 +/- 53. We present dsigma_J/psi/dy for the two rapidity regions under study and, for the forward-y range, d^2sigma_J/psi/dydp_t in the transverse momentum domain 0<p_t<8 GeV/c. The results are compared with previously published results at sqrt(s)=7 TeV and with theoretical calculations.
  03/2012;
• Article: Suppression of high transverse momentum D mesons in central Pb--Pb collisions at $\sqrt{s_{NN}}=2.76$ TeV

  ALICE Collaboration, B. Abelev, J. Adam, D. Adamová, A. M. Adare, M. M. Aggarwal, G. Aglieri Rinella, A. G. Agocs, A. Agostinelli, S. Aguilar Salazar, [......], D. Zhou, F. Zhou, Y. Zhou, X. Zhu, J. Zhu, A. Zichichi, A. Zimmermann, G. Zinovjev, Y. Zoccarato, M. Zynovyev
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  ABSTRACT: The production of the prompt charm mesons $D^0$, $D^+$, $D^{*+}$, and their antiparticles, was measured with the ALICE detector in Pb-Pb collisions at the LHC, at a centre-of-mass energy $\sqrt{s_{NN}}=2.76$ TeV per nucleon--nucleon collision. The $\pt$-differential production yields in the range $2<p_t<16$ GeV/c at central rapidity, $|y|<0.5$, were used to calculate the nuclear modification factor $R_{AA}$ with respect to a proton-proton reference obtained from the cross section measured at $\sqrt{s}=7$ TeV and scaled to $\sqrt{s}=2.76$ TeV. For the three meson species, $R_{AA}$ shows a suppression by a factor 3-4, for transverse momenta larger than 5 GeV/c in the 20% most central collisions. The suppression is reduced for peripheral collisions.
  03/2012;
• Article: Particle-yield modification in jetlike azimuthal dihadron correlations in Pb-Pb collisions at √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, A Agostinelli, S Aguilar Salazar, [......], X Zhang, D Zhou, F Zhou, Y Zhou, X Zhu, A Zichichi, A Zimmermann, G Zinovjev, Y Zoccarato, M Zynovyev
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  ABSTRACT: The yield of charged particles associated with high-p(t) trigger particles (8<p(t)<15 GeV/c) is measured with the ALICE detector in Pb-Pb collisions at √s(NN)=2.76 TeV relative to proton-proton collisions at the same energy. The conditional per-trigger yields are extracted from the narrow jetlike correlation peaks in azimuthal dihadron correlations. In the 5% most central collisions, we observe that the yield of associated charged particles with transverse momenta p(t)>3 GeV/c on the away side drops to about 60% of that observed in pp collisions, while on the near side a moderate enhancement of 20%-30% is found.
  Physical Review Letters 03/2012; 108(9):092301. · 7.37 Impact Factor
• Article: J/ψ polarization in pp collisions at √s=7 TeV.

  B Abelev, A Abrahantes Quintana, D Adamová, A M Adare, M M Aggarwal, G Aglieri Rinella, A G Agocs, A Agostinelli, S Aguilar Salazar, Z Ahammed, [......], X Zhang, F Zhou, D Zhou, Y Zhou, X Zhu, A Zichichi, A Zimmermann, G Zinovjev, Y Zoccarato, M Zynovyev
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  ABSTRACT: The ALICE Collaboration has studied J/ψ production in pp collisions at √s=7 TeV at the LHC through its muon pair decay. The polar and azimuthal angle distributions of the decay muons were measured, and results on the J/ψ polarization parameters λ(θ) and λ(φ) were obtained. The study was performed in the kinematic region 2.5<y<4, 2<p(t)<8 GeV/c, in the helicity and Collins-Soper reference frames. In both frames, the polarization parameters are compatible with zero, within uncertainties.
  Physical Review Letters 02/2012; 108(8):082001. · 7.37 Impact Factor
• Article: J/ψ Polarization in pp Collisions at s=7TeV

  B. Abelev, A. Abrahantes Quintana, D. Adamová, A. M. Adare, M. M. Aggarwal, G. Aglieri Rinella, A. G. Agocs, A. Agostinelli, S. Aguilar Salazar, Z. Ahammed, [......], X. Zhang, F. Zhou, D. Zhou, Y. Zhou, X. Zhu, A. Zichichi, A. Zimmermann, G. Zinovjev, Y. Zoccarato, M. Zynovyev
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  ABSTRACT: The ALICE Collaboration has studied J/ψ production in pp collisions at s=7TeV at the LHC through its muon pair decay. The polar and azimuthal angle distributions of the decay muons were measured, and results on the J/ψ polarization parameters λθ and λϕ were obtained. The study was performed in the kinematic region 2.5<y<4, 2<pt<8GeV/c, in the helicity and Collins-Soper reference frames. In both frames, the polarization parameters are compatible with zero, within uncertainties.
  Physical Review Letters 01/2012; 108(8):82001. · 7.37 Impact Factor
• Article: Heavy flavour decay muon production at forward rapidity in proton-proton collisions at s=7 TeV

  ALICE Collaboration, B. Abelev, J. Adam, D. Adamová, A. M. Adare, M. M. Aggarwal, G. Aglieri Rinella, A. G. Agocs, A. Agostinelli, S. Aguilar Salazar, [......], X. Zhang, Y. Zhou, D. Zhou, F. Zhou, X. Zhu, A. Zichichi, A. Zimmermann, G. Zinovjev, Y. Zoccarato, M. Zynovyev
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  ABSTRACT: The production of muons from heavy flavour decays is measured at forward rapidity in proton-proton collisions at s=7 TeV collected with the ALICE experiment at the LHC. The analysis is carried out on a data sample corresponding to an integrated luminosity L=16.5 nb. The transverse momentum and rapidity differential production cross sections of muons from heavy flavour decays are measured in the rapidity range 2.5<y<4, over the transverse momentum range 2<p<12 GeV/c. The results are compared to predictions based on perturbative QCD calculations.
  Physics Letters B 01/2012; 708:265-275. · 3.95 Impact Factor
• Article: Light vector meson production in pp collisions at root s=7 TeV ALICE Collaboration

  B Abelev, A Abrahantes Quintana, D Adamova, A M Adare, M M Aggarwal, Aglieri G Rinella, A G Agocs, A Agostinelli, S Aguilar Salazar, Z Ahammed, [......], D Zhou, Y Zhou, F Zhou, X Zhu, A Zichichi, A Zimmermann, G Zinovjev, Y Zoccarato, M Zynovyev, ALICE Collaboration
  Physics Letters B 01/2012; 710(4-5):557-568. · 3.95 Impact Factor
• Article: Measurement of electrons from semileptonic heavy-flavor hadron decays in pp collisions at root s=7 TeV

  B Abelev, J Adam, D Adamova, A M Adare, M M Aggarwal, Aglieri G Rinella, A G Agocs, A Agostinelli, S Aguilar Salazar, Z Ahammed, [......], Y Zhou, J Zhu, X Zhu, A Zichichi, A Zimmermann, G Zinovjev, Y Zoccarato, M Zynovyev, M Zyzak, ALICE Collaboration
  Physical Review D 01/2012; 86(11). · 4.56 Impact Factor
• Article: Inclusive J/psi production in pp collisions at root s=2.76 TeV

  B Abelev, J Adam, D Adamova, A M Adare, M M Aggarwal, Aglieri G Rinella, A G Agocs, A Agostinelli, Aguilar S Salazar, Z Ahammed, [......], D Zhou, Y Zhou, F Zhou, X Zhu, A Zichichi, A Zimmermann, G Zinovjev, Y Zoccarato, M Zynovyev, ALICE Collaboration
  Physics Letters B 01/2012; 718(2):295-306. · 3.95 Impact Factor
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  Available from: Adam Jacholkowski

  Article: (KsKs0)-K-0 correlations in pp collisions at root s=7 TeV from the LHC ALICE experiment

  B Abelev, J Adam, D Adamova, A M Adare, M M Aggarwal, Aglieri G Rinella, A G Agocs, A Agostinelli, S Aguilar Salazar, Z Ahammed, [......], Y Zhou, J Zhu, X Zhu, A Zichichi, A Zimmermann, G Zinovjev, Y Zoccarato, M Zynovyev, M Zyzak, ALICE Collaboration
  Physics Letters B 01/2012; 717(1-3):151-161. · 3.95 Impact Factor
• Article: [InlineMediaObject not available: see fulltext.]Measurement of charm production at central rapidity in proton-proton collisions at sqrt {s} = 7{ }TeV

  B. Abelev, A. Abrahantes Quintana, D. Adamová, A. M. Adare, M. M. Aggarwal, G. Aglieri Rinella, A. G. Agocs, A. Agostinelli, S. Aguilar Salazar, Z. Ahammed, [......], X. Zhang, F. Zhou, D. Zhou, Y. Zhou, X. Zhu, A. Zichichi, A. Zimmermann, G. Zinovjev, Y. Zoccarato, M. Zynovyev
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  ABSTRACT: The p t-differential inclusive production cross sections of the prompt charmed mesons D0, D+, and D*+ in the rapidity range | y| < 0.5 were measured in proton-proton collisions at sqrt {s} = 7{ }TeV at the LHC using the ALICE detector. Reconstructing the decays D0 → K-π+, D+ → K-π+π+, D*+ → D0π+, and their charge conjugates, about 8,400 D0, 2,900 D+, and 2,600 D*+ mesons with 1 < p t < 24 GeV/ c were counted, after selection cuts, in a data sample of 3.14 × 108 events collected with a minimum-bias trigger (integrated luminosity L int = 5 nb-1). The results are described within uncertainties by predictions based on perturbative QCD.
  Journal of High Energy Physics 12/2011; 1:128. · 5.83 Impact Factor
• Article: [InlineMediaObject not available: see fulltext.]Measurement of charm production at central rapidity in proton-proton collisions at sqrt {s} = 7{ }TeV

  B. Abelev, A. Abrahantes Quintana, D. Adamová, A. M. Adare, M. M. Aggarwal, G. Aglieri Rinella, A. G. Agocs, A. Agostinelli, S. Aguilar Salazar, Z. Ahammed, [......], X. Zhang, F. Zhou, D. Zhou, Y. Zhou, X. Zhu, A. Zichichi, A. Zimmermann, G. Zinovjev, Y. Zoccarato, M. Zynovyev
  [show abstract] [hide abstract]
  ABSTRACT: The p t-differential inclusive production cross sections of the prompt charmed mesons D0, D+, and D*+ in the rapidity range | y| < 0.5 were measured in proton-proton collisions at sqrt {s} = 7{ }TeV at the LHC using the ALICE detector. Reconstructing the decays D0 → K-π+, D+ → K-π+π+, D*+ → D0π+, and their charge conjugates, about 8,400 D0, 2,900 D+, and 2,600 D*+ mesons with 1 < p t < 24 GeV/ c were counted, after selection cuts, in a data sample of 3.14 × 108 events collected with a minimum-bias trigger (integrated luminosity L int = 5 nb-1). The results are described within uncertainties by predictions based on perturbative QCD.
  Journal of High Energy Physics 12/2011; 1:128. · 5.83 Impact Factor
• Source

  Available from: Daniel Felea

  Article: Light vector meson production in pp collisions at sqrt(s) = 7 TeV

  ALICE Collaboration, B. Abelev, A. Abrahantes Quintana, D Adamová, A. M. Adare, M. M. Aggarwal, G. Aglieri Rinella, A. G. Agocs, A. Agostinelli, S. Aguilar Salazar, [......], X Zhang, D Zhou, Y Zhou, F Zhou, X Zhu, A. Zichichi, A Zimmermann, G. Zinovjev, Y. Zoccarato, M. Zynovyev
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  ABSTRACT: The ALICE experiment has measured low-mass dimuon production in pp collisions at \sqrt{s} = 7 TeV in the dimuon rapidity region 2.5<y<4. The observed dimuon mass spectrum is described as a superposition of resonance decays (\eta, \rho, \omega, \eta^{'}, \phi) into muons and semi-leptonic decays of charmed mesons. The measured production cross sections for \omega and \phi are \sigma_\omega (1<p_t<5 GeV/c,2.5<y<4) = 5.28 +- 0.54 (stat) +- 0.50 (syst) mb and \sigma_\phi(1<p_t<5 GeV/c,2.5<y<4)=0.940 +- 0.084 (stat) +- 0.078 (syst) mb. The differential cross sections d^2\sigma/dy dp_t are extracted as a function of p_t for \omega and \phi. The ratio between the \rho and \omega cross section is obtained. Results for the \phi are compared with other measurements at the same energy and with predictions by models.
  12/2011;
• Source

  Available from: Daniel Felea

  Article: Measurement of charm production at central rapidity in proton-proton collisions at sqrt(s) = 7 TeV

  The ALICE Collaboration, B. Abelev, A. Abrahantes Quintana, D. Adamova, A. M. Adare, M. M. Aggarwal, G. Aglieri Rinella, A. G. Agocs, A. Agostinelli, S. Aguilar Salazar, [......], X Zhang, F Zhou, D Zhou, Y Zhou, X Zhu, A. Zichichi, A Zimmermann, G. Zinovjev, Y. Zoccarato, M. Zynovyev
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  ABSTRACT: The pt-differential inclusive production cross sections of the prompt charmed mesons D0, D+, and D*+ in the rapidity range |y|<0.5 were measured in proton-proton collisions at sqrt(s) = 7 TeV at the LHC using the ALICE detector. Reconstructing the decays D0->K-pi+, D+->K-pi+pi+, D*+->D0pi+, and their charge conjugates, about 8,400 D0, 2,900 D+, and 2,600 D*+ mesons with 1<pt<24 GeV/c were counted, after selection cuts, in a data sample of 3.14x10^8 events collected with a minimum-bias trigger (integrated luminosity L_int = 5/nb). The results are described within uncertainties by predictions based on perturbative QCD.
  11/2011;