Abstract
Production cross-sections of prompt charm mesons are measured with the first data from $pp$ collisions at the LHC at a centre-of-mass energy of $13\,\mathrm{TeV}$. The data sample corresponds to an integrated luminosity of $4.98 \pm 0.19\,\mathrm{pb}^{-1}$ collected by the LHCb experiment. The production cross-sections of $D^{0}$, $D^{+}$, $D_{s}^{+}$, and $D^{*+}$ mesons are measured in bins of charm meson transverse momentum, $p_{\mathrm{T}}$, and rapidity, $y$, and cover the range $0 < p_{\mathrm{T}} < 15\,\mathrm{GeV}/c$ and $2.0 < y < 4.5$. The ratios of the integrated cross-sections between charm mesons agree with previously measured fragmentation fractions. The inclusive $c\overline{c}$ cross-section within the range of $0 < p_{\mathrm{T}} < 8\,\mathrm{GeV}/c$ is found to be \[ \sigma(pp \to c\overline{c}X) = 2940 \pm 3 \pm 180 \pm 160\,\mu\mathrm{b} \] where the uncertainties are due to statistical, systematic and fragmentation fraction uncertainties, respectively.
Highlights
Production cross-sections of prompt charm mesons are measured with the first data from pp collisions at the Large Hadron Collider (LHC) at a centre-of-mass energy of 13 TeV
The charm production cross-sections are important in evaluating the rate of highenergy neutrinos created from the decay of charm hadrons produced in cosmic ray interactions with atmospheric nuclei [1, 14]
At the Large Hadron Collider (LHC), charm cross√-sections in pp collis√ions have been measured in the |y| < 0.5 region for pT > 1 GeV/c at s = 2.76 TeV and s = 7 TeV by the ALICE experiment [18,19,20]
Summary
The LHCb detector [21, 22] is a single-arm forward spectrometer covering the pseudorapidity range 2 < η < 5, designed for the study of particles containing b or c. The online event selection is performed by a trigger This consists of a hardware stage, which for this analysis randomly selects a pre-defined fraction of all beam-beam crossings, followed by a software stage. This analysis benefits from a new scheme for the LHCb software trigger introduced for LHC Run 2. The same alignment and calibration information is propagated to the offline reconstruction, ensuring consistent and high-quality particle identification (PID) information between the trigger and offline software. The larger timing budget available in the trigger compared to LHCb Run 1 results in the convergence of the online and offline track reconstruction, such that offline performance is achieved in the trigger. The implementation of the interaction of the generated particles with the detector, and its response, uses the Geant toolkit [29] as described in ref. [30]
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