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

S. Acharya , A. Baldisseri (1) , H. Borel (1) , J. Castillo Castellanos (1) , J.L. Charvet (1) , V.J.G. Feuillard (1) , A. Lardeux (1) , S. Panebianco (1) , H. Pereira Da Costa (1) , A. Rakotozafindrabe (1) , Laurent Aphecetche (2) , B. Audurier (2) , Guillaume Batigne (2) , B. Erazmus (2) , A. Francisco (2) , Marie Germain (2) , Gines Martinez Garcia , A. Morreale (2) , Philippe Pillot (2) , L. Ronflette (2) , Y. Schutz (2) , Alexandre Shabetai (2) , Diego Stocco (2) , C. Cheshkov (3) , B. Cheynis (3) , L. Ducroux (3) , B. Teyssier (3) , R. Tieulent (3) , A. Uras (3) , I. Belikov (4) , C. Kuhn , A. Maire (4) , F. Rami (4) , C. Roy , S. Senyukov (4) , R. Vernet (5) , Z. Conesa Del Valle (6) , I. Das (6) , B. Espagnon (6) , C. Hadjidakis (6) , I. Lakomov (6) , C. Suire (6) , J. D. Tapia Takaki (6) , M. Tarhini (6) , L. Valencia Palomo (6)

1 IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers
2 SUBATECH - Laboratoire SUBATECH Nantes
3 IPNL - Institut de Physique Nucléaire de Lyon
4 IPHC - Institut Pluridisciplinaire Hubert Curien
5 CC-IN2P3 - Centre de Calcul de l'IN2P3
6 IPNO - Institut de Physique Nucléaire d'Orsay

The production cross sections of the prompt charmed mesons ${\rm D^0}$, ${\rm D^+}$, ${\rm D^{*+}}$ and ${\rm D_s^+}$ 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 ${\rm D}^0 \to {\rm K}^-\pi^+$, ${\rm D}^+\to {\rm K}^-\pi^+\pi^+$, ${\rm D}^{*+} \to {\rm D}^0 \pi^+$, ${\rm D_s^{+}\to \phi\pi^+\to K^-K^+\pi^+}$, and their charge conjugates. With respect to previous measurements in the same rapidity region, the coverage in transverse momentum ($p_{\rm T}$) is extended and the uncertainties are reduced by a factor of about two. The accuracy on the estimated total $\rm c\overline c$ production cross section is likewise improved. The measured $p_{\rm T}$-differential cross sections are compared with the results of three perturbative QCD calculations.

Domaines: Physique des Hautes Energies - Expérience [hep-ex]

S. Acharya, A. Baldisseri, H. Borel, J. Castillo Castellanos, J.L. Charvet, et al.. Measurement of D-meson production at mid-rapidity in pp collisions at $\mathbf{\sqrt{s}=7}$ TeV. European Physical Journal C: Particles and Fields, 2017, 77, pp.550. ⟨10.1140/epjc/s10052-017-5090-4⟩. ⟨in2p3-01454731⟩