Abstract
Abstract The p t-differential inclusive production cross sections of the prompt charmed mesons D0, D+, and D*+ in the rapidity range |y| < 0.5 were measured in proton-proton collisions at $ \sqrt {s} = 7{ }TeV $ at the LHC using the ALICE detector. Reconstructing the decays D0 → K−π+, D+ → K−π+π+, D*+ → D0π+, and their charge conjugates, about 8,400 D0, 2,900 D+, and 2,600 D*+ mesons with 1 < p t < 24 GeV/c were counted, after selection cuts, in a data sample of 3.14 × 108 events collected with a minimum-bias trigger (integrated luminosity L int = 5 nb−1). The results are described within uncertainties by predictions based on perturbative QCD.
Highlights
The pt-differential inclusive production cross sections of the prompt charmed mesons D0, D√+, and D∗+ in the rapidity range |y| < 0.5 were measured in proton-proton collisions at s = 7 TeV at the LHC using the ALICE detector
The measured D meson inclusive differential production cross sections are compared to two theoretical predictions, namely FONLL [1, 2, 33] and GM-VFNS [10, 34]
We have presented the measurement by the ALICE Collaboration of the inclusive different√ial production cross sections of prompt D mesons at central rapidity, in pp collisions at s = 7 TeV within 1 < pt < 24 GeV/c
Summary
D0, D+, and D∗+ mesons, and their charge conjugates, are reconstructed from their decays into charged hadrons in the central rapidity region utilizing the tracking and particle identification capabilities of the ALICE central barrel detectors. The instantaneous luminosity in the ALICE experiment was limited to 0.6– 1.2 × 1029 cm−2s−1 by displacing the beams in the transverse plane by 3.8 times the r.m.s of their transverse profile In this way, the interaction probability per bunch crossing was kept in the range 0.04–0.08, with probability of collision pile-up below 4% per triggered event. The luminous region was measured with high precision from the distribution of the interaction vertices reconstructed from the charged particles tracked in the ALICE central barrel detectors, yielding σxluminous ≈ σyluminous ≈ 35–50 μm in the transverse plane and σzluminous ≈ 4–6 cm along the beam direction (the quoted ranges are due to the variations of the beam conditions during the data taking). Events with interaction vertex in the range |z| < 10 cm were used for the analysis
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