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Phys Rev Lett. 2014 Dec 5;113(23):232301. Epub 2014 Dec 4.

Measurement of prompt D-meson production in p-Pb collisions at √(s(NN))=5.02 TeV.

Abelev B, Adam J, Adamová D, Aggarwal MM, Aglieri Rinella G, Agnello M, Agostinelli A, Agrawal N, Ahammed Z, Ahmad N, Ahmed I, Ahn SU, Ahn SA, Aimo I, Aiola S, Ajaz M, Akindinov A, Alam SN, Aleksandrov D, Alessandro B, Alexandre D, Alici A, Alkin A, Alme J, Alt T, Altinpinar S, Altsybeev I, Alves Garcia Prado C, Andrei C, Andronic A, Anguelov V, Anielski J, Antičić T, Antinori F, Antonioli P, Aphecetche L, Appelshäuser H, Arcelli S, Armesto N, Arnaldi R, Aronsson T, Arsene IC, Arslandok M, Augustinus A, Averbeck R, Awes TC, Azmi MD, Bach M, Badalà A, Baek YW, Bagnasco S, Bailhache R, Bala R, Baldisseri A, Baltasar Dos Santos Pedrosa F, Baral RC, Barbera R, Barile F, Barnaföldi GG, Barnby LS, Barret V, Bartke J, Basile M, Bastid N, Basu S, Bathen B, Batigne G, Batyunya B, Batzing PC, Baumann C, Bearden IG, Beck H, Bedda C, Behera NK, Belikov I, Bellini F, Bellwied R, Belmont-Moreno E, Belmont R, Belyaev V, Bencedi G, Beole S, Berceanu I, Bercuci A, Berdnikov Y, Berenyi D, Berger ME, 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MB, Zinovjev G, Zoccarato Y, Zyzak M; (ALICE Collaboration).

Abstract

The p_{T}-differential production cross sections of the prompt charmed mesons D^{0}, D^{+}, D^{*+}, and D_{s}^{+} and their charge conjugate in the rapidity interval -0.96<y_{cms}<0.04 were measured in p-Pb collisions at a center-of-mass energy sqrt[s_{NN}]=5.02  TeV with the ALICE detector at the LHC. The nuclear modification factor R_{pPb}, quantifying the D-meson yield in p-Pb collisions relative to the yield in pp collisions scaled by the number of binary nucleon-nucleon collisions, is compatible within the 15%-20% uncertainties with unity in the transverse momentum interval 1<p_{T}<24  GeV/c. No significant difference among the R_{pPb} of the four D-meson species is observed. The results are described within uncertainties by theoretical calculations that include initial-state effects. The measurement adds experimental evidence that the modification of the momentum spectrum of D mesons observed in Pb-Pb collisions with respect to pp collisions is due to strong final-state effects induced by hot partonic matter.

PMID:
25526119
DOI:
10.1103/PhysRevLett.113.232301
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