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 âs = 2.76 TeV with the ALICE detector at the Large Hadron Collider. The analysis exploited the hadronic decays D0 â K-Ï+, D+ â K-Ï+Ï+, D*+ â D0Ï+, 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 âs = 2.76 TeV and at 7 TeV was evaluated by extrapolating to the full phase space the pt-differential production cross sections at âs = 2.76 TeV and our previous measurements at âs = 7 TeV. The results were compared to existing measurements and to perturbative-QCD calculations. The fraction of cd D mesons produced in a vector state was also determined. Â© 2012 SISSA.
|Titolo:||Measurement of charm production at central rapidity in proton-proton collisions at t √s = 2.76 TeV|
|Data di pubblicazione:||2012|
|Appare nelle tipologie:||1.1.1 Articolo su rivista con DOI|