Measurement of charm production at central rapidity in proton-proton collisions at $\sqrt{s}=2.76$ TeV

Abstract

The $p_{\mathrm{T}}$-differential production cross sections of the prompt (B feed-down subtracted) charmed mesons D${}^0$, D${}^{+}$, and D${}^{\ast +}$ in the rapidity range $|y|<0.5$, and for transverse momentum $1<p_{\mathrm{T}}<12$ 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 D${}^0\to$K$\pi$, D${}^{+}\to$K$\pi \pi$, D${}^{\ast +}\to$D${}^0\pi$, and their charge conjugates, and was performed on a $L_{\mathrm{int}}=1.1$ 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 $p_{\mathrm{T}}$-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 cdbar D mesons produced in a vector state was also determined.

20 pages, 5 captioned figures, 4 tables, authors from page 15, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/3079

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