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Measurement of charm production at central rapidity in proton-proton collisions at \( \sqrt {s} = 2.76\;{\text{TeV}} \)

Abstract

The p t-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 < p t< 12 GeV/c, were measured in proton-proton collisions at \( \sqrt {s} = 2.76\;{\text{TeV}} \) with the ALICE detector at the Large Hadron Collider. The analysis exploited the hadronic decays D0 → Kπ+, D+ → Kπ+π+, D*+ → D0π+, and their charge conjugates, and was performed on a \( {\mathcal{L}_{{{\rm int} }}} = 1.1\;{\text{n}}{{\text{b}}^{{ - 1}}} \) event sample collected in 2011 with a minimum-bias trigger. The total charm production cross section at \( \sqrt {s} = 2.76\;{\text{TeV}} \) and at 7 TeV was evaluated by extrapolating to the full phase space the p t-differential production cross sections at \( \sqrt {s} = 2.76\;{\text{TeV}} \) and our previous measurements at \( \sqrt {s} = 7\;{\text{TeV}} \). The results were compared to existing measurements and to perturbative-QCD calculations. The fraction of \( {\text{c}}\overline {\text{d}} \) D mesons produced in a vector state was also determined.

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