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meson production at central rapidity in protonaproton collisions at

The p T -differential inclusive production cross section of the prompt charm-strange meson D s + in the rapidity range | y | < 0.5 was measured in protonaproton collisions at s = 7 TeV at the LHC using the ALICE detector. The analysis was performed on a data sample of 2.98 X 10 8 events collected...

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Published in:Physics letters. B 2012-12, Vol.718 (2), p.279-294
Main Authors: Abelev, B, Adam, J, Adamova, D, Adare, A M, Aggarwal, M M, Aglieri Rinella, G, Agocs, A G, Agostinelli, A, Aguilar Salazar, S, Ahammed, Z, Ahmad, N, Ahmad Masoodi, A, Ahn, SA, Ahn, SU, Akindinov, A, Aleksandrov, D, Alessandro, B, Alfaro Molina, R, Alici, A, Alkin, A, Almaraz Avina, E, Alme, J, Alt, T, Altini, V, Altinpinar, S, Altsybeev, I, Andrei, C, Andronic, A, Anguelov, V, Anielski, J, Anson, C, Anticic, T, Antinori, F, Antonioli, P, Aphecetche, L, Appelshaeuser, H, Arbor, N, Arcelli, S, Arend, A, Armesto, N, Arnaldi, R, Aronsson, T, Arsene, I C, Arslandok, M, Asryan, A, Augustinus, A, Averbeck, R, Awes, T C, Aeystoe, J, Azmi, MD
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Language:English
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Summary:The p T -differential inclusive production cross section of the prompt charm-strange meson D s + in the rapidity range | y | < 0.5 was measured in protonaproton collisions at s = 7 TeV at the LHC using the ALICE detector. The analysis was performed on a data sample of 2.98 X 10 8 events collected with a minimum-bias trigger. The corresponding integrated luminosity is L int = 4.8 nb - 1 . Reconstructing the decay D s + a I pi + , with I a K - K + , and its charge conjugate, about 480 D s +/- mesons were counted, after selection cuts, in the transverse momentum range 2 < p T < 12 GeV / c . The results are compared with predictions from models based on perturbative QCD. The ratios of the cross sections of four D meson species (namely D 0 , D + , D a + and D s +) were determined both as a function of p T and integrated over p T after extrapolating to full p T range, together with the strangeness suppression factor in charm fragmentation. The obtained values are found to be compatible within uncertainties with those measured by other experiments in e + e - , ep and pp interactions at various centre-of-mass energies.
ISSN:0370-2693
DOI:10.1016/j.physletb.2012.10.049