Abstract

The production cross sections for prompt open-charm mesons in proton-proton collisions at a center-of-mass energy of 13 TeV are reported. The measurement is performed using a data sample collected by the CMS experiment corresponding to an integrated luminosity of 29 nb−1. The differential production cross sections of the D∗±, D±, and D0 left({overline{mathrm{D}}}^0right) mesons are presented in ranges of transverse momentum and pseudorapidity 4 < pT< 100 GeV and |η| < 2.1, respectively. The results are compared to several theoretical calculations and to previous measurements.

Highlights

  • Background modelingIntegrated luminosity TotalJHEP11(2021)225 as the systematic uncertainty, yielding 3.6, 5.0, and 4.2% for the D∗+, D0, and D+ meson cross sections, respectively

  • The cross section predictions from the different PYTHIA tunes differ in both normalization and shape, which confirms that the description of the data provided by the models is sensitive to further model improvements

  • The differential cross sections dσ/dpT and dσ/d|η| for prompt charm meson (D∗±, D0 (D0), and D±) production are measured in the transverse momentum range 4 < pT < 100 GeV

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Summary

Introduction

JHEP11(2021)225 as the systematic uncertainty, yielding 3.6, 5.0, and 4.2% for the D∗+, D0, and D+ meson cross sections, respectively. For the combinatorial background description, the systematic uncertainty is evaluated by replacing the baseline function with a fourth-degree polynomial, resulting in 1.2, 4.8, and 5.3% for the D∗+, D0, and D+ meson cross sections, respectively. During the 2016 run, the CMS tracker suffered some time-dependent inefficiencies that resulted in a nonnegligible change in charm meson yields. The average PU rate varied during the data taking. Both these effects are taken into account by correcting the different runs for the tracker inefficiency, which was determined from simulation after the PU distribution in the simulated events was reweighted to match the data. The resulting systematic uncertainty in the correction is estimated to be 1.4%

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