Recombination mechanism for $D^0$-meson production and $D^0-\overline{D^0}$ production asymmetry in the LHCb $p+{}^{20}Ne$ fixed-target experiment

Abstract

We discuss production of neutral $D$ mesons in proton-proton collisions at the LHC (fixed target mode) in the framework of the BJM recombination model. We present rapidity and transverse momentum distributions of $D$ mesons and compare the recombination contribution to the dominant gluon-gluon fusion mechanism. Both the direct production, as dictated by the matrix element, and fragmentation of the associated $c$ or $\bar{c}$ are included. The latter mechanism generates $D$ mesons with smaller rapidities than those produced directly. We calculate the $D^0+{\bar{D}}^0$ meson distributions relevant for fixed target $p+{}^{4}He$ collisions at $\sqrt{s}$ = 86.6 GeV as well as for $p+{}^{20}Ne$ collisions at $\sqrt{s}$ = 69 GeV. The recombination component is consistent with the LHCb data and in addition results in production asymmetry. The asymmetries in $D^0-\overline{D^0}$ production as a function of rapidity and transverse momentum are shown and the cancellation of terms for direct production and associated $c/\bar{c}$ fragmentation is discussed.

arXiv comment16 pages, 8 figures. arXiv admin note: text overlap with arXiv:2105.09370

References in corpus (23)

• An Introduction to PYTHIA 8.2
• The Color Glass Condensate and hadron production in the forward region
• QCD coherence in the structure function and associated distributions at small $x$
• Production and Hadronization of Heavy Quarks
• Flavour and Spin of the Proton and the Meson Cloud
• Transverse momentum dependent gluon density from DIS precision data
• Combined analysis of charm-quark fragmentation-fraction measurements
• Open charm production at the LHC - $k_t$-factorization approach
• First measurement of charm production in fixed-target configuration at the LHC
• Measurement of the D+/- production asymmetry in 7 TeV pp collisions
• ON THE INTRINSIC CHARM COMPONENT OF THE NUCLEON
• HERA Anomaly and Hard Charm in the Nucleon
• Production of $c\bar{c}c\bar{c}$ in double-parton scattering within $k_t$-factorization approach -- meson-meson correlations
• D-Meson Production from Recombination in Hadronic Collisions
• Consistent treatment of charm production in higher-orders at tree-level within $k_T$-factorization approach
• Large-p_T production of D mesons at the LHCb in the parton Reggeization approach
• D meson production asymmetry, unfavoured fragmentation and consequences for prompt atmospheric neutrino production
• Open charm meson production at BNL RHIC within $k_t$-factorization approach and revision of their semileptonic decays
• Exploring minijets beyond the leading power
• On the energy dependence of the D^+/D^- production asymmetry
• Independent quark/antiquark fragmentation to massive particles in proton-proton collisions
• Impact of the LHCb $p+{}^{4}He$ fixed-target $D^0/\overline{D^0}$ data on the intrinisic $c\bar{c}$ component in the nucleon
• QCD predictions for open charm meson production at the LHCb in fixed-target experiment

Cited by in corpus (3)

• Far-forward production of charm mesons and neutrinos at Forward Physics Facilities at the LHC and the intrinsic charm in the proton
• Open charm production and asymmetry in $p$Ne collisions at $\sqrt{s_{\mathrm{NN}}}=$ 68.5 GeV
• Contribution from Intrinsic Charm Production to Fixed-Target Interactions at the LHC