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The transverse momentum (pT) distribution of primary charged particles is measured in minimum bias (non-single-diffractive) p-Pb collisions at sNN−−−√=5.02 TeV with the ALICE detector at the LHC. The pT spectra measured near central rapidity in the range 0.5<pT<20 GeV/c exhibit a weak pseudorapidity dependence. The nuclear modification factor RpPb is consistent with unity for pT above 2 GeV/c. This measurement indicates that the strong suppression of hadron production at high pT observed in Pb-Pb collisions at the LHC is not due to an initial-state effect. The measurement is compared to theoretical calculations.
Measurement of charm production at central rapidity in proton-proton collisions at √s = 2.76 TeV
(2012)
The pT-differential production cross sections of the prompt (B feed-down subtracted) charmed mesons D0, D+, and D∗+ in the rapidity range |y|<0.5, and for transverse momentum 1<pT<12 GeV/c, were measured in proton-proton collisions at s√=2.76 TeV with the ALICE detector at the Large Hadron Collider. The analysis exploited the hadronic decays D0→Kπ, D+→Kππ, D∗+→D0π, and their charge conjugates, and was performed on a Lint=1.1 nb−1 event sample collected in 2011 with a minimum-bias trigger. The total charm production cross section at s√=2.76 TeV and at 7 TeV was evaluated by extrapolating to the full phase space the pT-differential production cross sections at s√=2.76 TeV and our previous measurements at s√=7 TeV. The results were compared to existing measurements and to perturbative-QCD calculations. The fraction of cdbar D mesons produced in a vector state was also determined.
The first measurement of neutron emission in electromagnetic dissociation of 208Pb 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 sNN−−−√ = 2.76 TeV with neutron emission are σsingle EMD=187.4±0.2 (stat.) +13.2−11.2 (syst.) b and σmutual EMD=5.7±0.1 (stat.) ±0.4 (syst.) b, respectively. The experimental results are compared to the predictions from a relativistic electromagnetic dissociation model.