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Journal of High Energy Physics 7 (2012) 191
Measurement of charm production at central rapidity in proton-proton collisions at sqrt(s) = 2.76 TeV
B. Abelev, R. Vernet1, I. Belikov2, B. Hippolyte2, S. Jangal2, C. Kuhn2, C. Roy2, X. Sanchez Castro2, S. Senyukov2, R. Wan2, L. Aphecetche3, Guillaume Batigne3, E. Bergognon3, M. Bregant3, H. Delagrange3, O. Driga3, M. Estienne3, M. Germain3, A. Lardeux3, F. Lefèvre3, M. Lenhardt3, L. Luquin3, G. Martinez Garcia3, A. Mas3, L. Massacrier3, 4, A. Matyja3, P. Pillt3, Y. Schutz3, A. Shabetai3, D. Stocco3, c. Cheshkov4, B. Cheynis4, L. Ducroux4, J.-Y. Grossiord4, M. Guilbaud4, R. Tieulent4, A. Uras4, Y. Zoccarato4, Sang Un Ahn5, Y.W. Baek5, A. Baldit5, V. Barret5, N. Bastid5, P. Crochet5, P. Dupieux5, R. Ichou5, X. Lopez5, F. Manso5, M. Marchisone5, S. Porteboeuf-Houssais5, P. Rosnet5, B. Vulpescu5, X. Zhang5, N. Arbor6, G. Conesa Balbastre6, J. Faivre6, C. Furget6, R. Guernane6, S. Kox6, J.S. Real6, C. Silvestre6, J. Castillo Castellanos7, J.L. Charvet7, C. Geuna7, S. Pal7, H. Pereira Da Costa7, A. Rakotozafindrabe7, H. Yang7, B. Espagnon8, L. Valencio Palomo8
ALICE Collaboration(s)

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 sqrt(s) = 2.76 TeV with the ALICE detector at the Large Hadron Collider. The analysis exploited the hadronic decays D0 -> K pi, D+ -> K pi pi, D*+ -> D0 pi, and their charge conjugates, and was performed on a L_{int} = 1.35 nb^{-1} event sample collected in 2011 with a minimum-bias trigger. The total charm production cross section at sqrt(s) = 2.76 TeV and at 7 TeV was evaluated by extrapolating to the full phase space the pt-differential production cross sections at sqrt(s) = 2.76 TeV and our previous measurements at sqrt(s) = 7 TeV. The results were compared to existing measurements and to perturbative-QCD calculations. The fraction of cubar D mesons produced in a vector state was also determined.
1 :  CC IN2P3 - Centre de Calcul de l'inst. national de phy. nucléaire et de phy. des particules
2 :  DRS-IPHC - Département Recherches Subatomiques
3 :  SUBATECH - Laboratoire SUBATECH Nantes
4 :  IPNL - Institut de Physique Nucléaire de Lyon
5 :  LPC - Laboratoire de Physique Corpusculaire [Clermont-Ferrand]
6 :  LPSC - Laboratoire de Physique Subatomique et de Cosmologie
7 :  IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers (ex DAPNIA)
8 :  IPNO - Institut de Physique Nucléaire d'Orsay
Laboratoire de Physique Corpusculaire
Physique/Physique des Hautes Energies - Expérience

Physique/Physique Nucléaire Expérimentale
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