Measurement of D-meson production at mid-rapidity in pp collisions at $\sqrt{\mathbf{s}}=7$ TeV

Abstract

The production cross sections of the prompt charmed mesons ${\mathrm{D}}^0$, ${\mathrm{D}}^{+}$, ${\mathrm{D}}^{\ast +}$ and ${\mathrm{D}}_{\mathrm{s}}^{+}$ were measured at mid-rapidity in proton-proton collisions at a centre-of-mass energy $\sqrt{s}=7$ TeV with the ALICE detector at the Large Hadron Collider (LHC). D mesons were reconstructed from their decays ${\mathrm{D}}^0\to {\mathrm{K}}^{-}{\pi }^{+}$, ${\mathrm{D}}^{+}\to {\mathrm{K}}^{-}{\pi }^{+}{\pi }^{+}$, ${\mathrm{D}}^{\ast +}\to {\mathrm{D}}^0{\pi }^{+}$, ${\mathrm{D}}_{\mathrm{s}}^{+}\to \varphi {\pi }^{+}\to {\mathrm{K}}^{-}{\mathrm{K}}^{+}{\pi }^{+}$, and their charge conjugates. With respect to previous measurements in the same rapidity region, the coverage in transverse momentum ($p_{\mathrm{T}}$) is extended and the uncertainties are reduced by a factor of about two. The accuracy on the estimated total $\mathrm{c}\overline{\mathrm{c}}$ production cross section is likewise improved. The measured $p_{\mathrm{T}}$-differential cross sections are compared with the results of three perturbative QCD calculations.

28 pages, 9 captioned figures, 4 tables, authors from page 23, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/3365

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