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Measurement of electrons from semileptonic heavy-flavor hadron decays inppcollisions ats=2.76 TeV
Abelev, B.,Adam, J.,Adamová,, D.,Aggarwal, M. M.,Agnello, M.,Agostinelli, A.,Agrawal, N.,Ahammed, Z.,Ahmad, N.,Ahmed, I.,Ahn, S. U.,Ahn, S. A.,Aimo, I.,Aiola, S.,Ajaz, M.,Akindinov, A.,Alam, S. American Physical Society 2015 PHYSICAL REVIEW D - Vol.91 No.1
<P>The p(T)-differential production cross section of electrons from semileptonic decays of heavy-flavor hadrons has been measured at midrapidity in proton-proton collisions at root s = 2.76 TeV in the transverse momentum range 0.5 < p(T) < 12 GeV/c with the ALICE detector at the LHC. The analysis was performed using minimum bias events and events triggered by the electromagnetic calorimeter. Predictions from perturbative QCD calculations agree with the data within the theoretical and experimental uncertainties.</P>
Measurement of PromptD-Meson Production inp−PbCollisions atsNN=5.02 TeV
Abelev, B.,Adam, J.,Adamová,, D.,Aggarwal, M. M.,Aglieri Rinella, G.,Agnello, M.,Agostinelli, A.,Agrawal, N.,Ahammed, Z.,Ahmad, N.,Ahmed, I.,Ahn, S. U.,Ahn, S. A.,Aimo, I.,Aiola, S.,Ajaz, M.,Aki American Physical Society 2014 Physical Review Letters Vol.113 No.23
Freeze-out radii extracted from three-pion cumulants in pp, p–Pb and Pb–Pb collisions at the LHC
Abelev, B.,Adam, J.,Adamová,, D.,Aggarwal, M.M.,Agnello, M.,Agostinelli, A.,Agrawal, N.,Ahammed, Z.,Ahmad, N.,Ahmed, I.,Ahn, S.U.,Ahn, S.A.,Aimo, I.,Aiola, S.,Ajaz, M.,Akindinov, A.,Alam, S.N.,A Elsevier 2014 Physics letters: B Vol.739 No.-
<P><B>Abstract</B></P> <P>In high-energy collisions, the spatio-temporal size of the particle production region can be measured using the Bose–Einstein correlations of identical bosons at low relative momentum. The source radii are typically extracted using two-pion correlations, and characterize the system at the last stage of interaction, called kinetic freeze-out. In low-multiplicity collisions, unlike in high-multiplicity collisions, two-pion correlations are substantially altered by background correlations, e.g. mini-jets. Such correlations can be suppressed using three-pion cumulant correlations. We present the first measurements of the size of the system at freeze-out extracted from three-pion cumulant correlations in pp, p–Pb and Pb–Pb collisions at the LHC with ALICE. At similar multiplicity, the invariant radii extracted in p–Pb collisions are found to be 5–15% larger than those in pp, while those in Pb–Pb are 35–55% larger than those in p–Pb. Our measurements disfavor models which incorporate substantially stronger collective expansion in p–Pb as compared to pp collisions at similar multiplicity.</P>
Longitudinal spin transfer toΛandΛ¯hyperons in polarized proton-proton collisions ats=200 GeV
Abelev, B. I.,Aggarwal, M. M.,Ahammed, Z.,Alakhverdyants, A. V.,Anderson, B. D.,Arkhipkin, D.,Averichev, G. S.,Balewski, J.,Barannikova, O.,Barnby, L. S.,Baumgart, S.,Beavis, D. R.,Bellwied, R.,Benedo American Physical Society 2009 PHYSICAL REVIEW D - Vol.80 No.11
Observation of an Antimatter Hypernucleus
Abelev, B. I.,Aggarwal, M. M.,Ahammed, Z.,Alakhverdyants, A. V.,Alekseev, I.,Anderson, B. D.,Arkhipkin, D.,Averichev, G. S.,Balewski, J.,Barnby, L. S.,Baumgart, S.,Beavis, D. R.,Bellwied, R.,Betancour American Association for the Advancement of Scienc 2010 Science Vol.328 No.5974
Abelev, B.,Adam, J.,Adamová,, D.,Adare, A. M.,Aggarwal, M. M.,Aglieri Rinella, G.,Agnello, M.,Agocs, A. G.,Agostinelli, A.,Ahammed, Z.,Ahmad, N.,Ahmad Masoodi, A.,Ahmed, I.,Ahn, S. A.,Ahn, S. U. Springer Berlin Heidelberg 2013 European Physical Journal C Vol.73 No.12
<P>Differential cross sections of charged particles in inelastic pp collisions as a function of <I>p</I><SUB>T</SUB> have been measured at [FORMULA OMISSION] at the LHC. The <I>p</I><SUB>T</SUB> spectra are compared to NLO-pQCD calculations. Though the differential cross section for an individual [FORMULA OMISSION] cannot be described by NLO-pQCD, the relative increase of cross section with [FORMULA OMISSION] is in agreement with NLO-pQCD. Based on these measurements and observations, procedures are discussed to construct pp reference spectra at [FORMULA OMISSION] up to <I>p</I><SUB>T</SUB>=50 GeV/<I>c</I> as required for the calculation of the nuclear modification factor in nucleus–nucleus and proton–nucleus collisions.</P>
Abelev, B.,Adam, J.,Adamová,, D.,Aggarwal, M. M.,Agnello, M.,Agostinelli, A.,Agrawal, N.,Ahammed, Z.,Ahmad, N.,Ahmad Masoodi, A.,Ahmed, I.,Ahn, S. U.,Ahn, S. A.,Aimo, I.,Aiola, S.,Ajaz, M.,Akind Springer Berlin Heidelberg 2014 European Physical Journal C Vol.74 No.8
<P>The inclusive production cross sections at forward rapidity of [FORMULA OMISSION], [FORMULA OMISSION], [FORMULA OMISSION](1S) and [FORMULA OMISSION](2S) are measured in [FORMULA OMISSION] collisions at [FORMULA OMISSION] with the ALICE detector at the LHC. The analysis is based on a data sample corresponding to an integrated luminosity of 1.35 pb[FORMULA OMISSION]. Quarkonia are reconstructed in the dimuon-decay channel and the signal yields are evaluated by fitting the [FORMULA OMISSION] invariant mass distributions. The differential production cross sections are measured as a function of the transverse momentum [FORMULA OMISSION] and rapidity [FORMULA OMISSION], over the ranges [FORMULA OMISSION] GeV/c for [FORMULA OMISSION], [FORMULA OMISSION] GeV/c for all other resonances and for [FORMULA OMISSION]. The measured cross sections integrated over [FORMULA OMISSION] and [FORMULA OMISSION], and assuming unpolarized quarkonia, are: [FORMULA OMISSION] [FORMULA OMISSION]b, [FORMULA OMISSION] [FORMULA OMISSION]b, [FORMULA OMISSION] nb and [FORMULA OMISSION] nb, where the first uncertainty is statistical and the second one is systematic. The results are compared to measurements performed by other LHC experiments and to theoretical models.</P>
Abelev, B.,Adam, J.,Adamová,, D.,Aggarwal, M. M.,Rinella, G. Aglieri,Agnello, M.,Agostinelli, A.,Agrawal, N.,Ahammed, Z.,Ahmad, N.,Ahmed, I.,Ahn, S. U.,Ahn, S. A.,Aimo, I.,Aiola, S.,Ajaz, M.,Aki Springer-Verlag 2015 European Physical Journal C Vol.75 No.4
<P>The multiplicity and pseudorapidity distributions of inclusive photons have been measured at forward rapidities (2.3 < eta < 3.9) in proton-proton collisions at three center-of-mass energies, root s = 0.9, 2.76 and 7 TeV using the ALICE detector. It is observed that the increase in the average photon multiplicity as a function of beam energy is compatible with both a logarithmic and a power-law dependence. The relative increase in average photon multiplicity produced in inelastic pp collisions at 2.76 and 7 TeV center-of-mass energies with respect to 0.9 TeV are 37.2 +/- 0.3% (stat) +/- 8.8% (sys) and 61.2 +/- 0.3% (stat) +/- 7.6% (sys), respectively. The photon multiplicity distributions for all center-of-mass energies are well described by negative binomial distributions. The multiplicity distributions are also presented in terms of KNO variables. The results are compared to model predictions, which are found in general to underestimate the data at large photon multiplicities, in particular at the highest center-of-mass energy. Limiting fragmentation behavior of photons has been explored with the data, but is not observed in the measured pseudorapidity range.</P>