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

Abstract

and their charge conjugates.With respect to previous measurements in the same rapidity region, the coverage in transverse momentum ( p T ) is extended and the uncertainties are reduced by a factor of about two. The accuracy on the estimated total cc production cross section is likewise improved. The measured p Tdifferential cross sections are compared with the results of three perturbative QCD calculations.

Improvement of heavy flavor production in a multiphase transport model updated with modern nuclear parton distribution functions

“…This results from the anti-shadowing effect at large x and the shadowing effect at small x. We also see that the AMPT result agrees with the charm quark pair yield for 0- [50] and Λc data [52]. mated based on the STAR data of dσ(D 0 )/dy = 41 µb and dσ(D 0 + D + + D + s + Λ + c )/dy = 152 µb for 10-40% Au+Au collisions at √ s N N = 200 GeV [53].…”

New feature of low $$p_{T}$$ p T charm quark hadronization in pp collisions at $$\sqrt{s}=7$$

“…3, we show results for the ratios of different D mesons as a function of p T in pp collisions at √ s = 7 TeV, and we compare them with experimental data [40]. We see that, within experimental uncertainties, the model results are in agreement with the data.…”

“…Whether this agreement is coincidental or not can be tested in the future by the data of higher collision energies, such as those in pp collisions at √ s = 13 TeV. [40]. We see that QCM well describes the data of D mesons for p T 7 GeV/c but under-predicts the data for larger p T .…”

“…Theoretical pQCD calculations with fragmentation functions were compared with experimental data of D mesons in Refs. [39,40]. It is shown that pQCD calculations in large p T range have small theoretical uncertainties and often well explain the data.…”

“…Because of the large theoretical uncertainty, in particular, at low p T , we only take the FONLL calculation as a guideline. The practically used p T spectrum of charm quarks is reversely extracted from the data of D * + meson [39,40] in QCM with charm quark constituent mass m c = 1.5 GeV and is shown as the thick solid line in Fig. 1b.…”