Far-forward production of charm mesons and neutrinos at Forward Physics Facilities at the LHC and the intrinsic charm in the proton

Abstract

We discuss production of far-forward $D$ mesons/antimesons and neutrinos/antineutrinos from their semileptonic decays in pp-collisions at the LHC. We include the gluon-gluon fusion $gg\to c\bar{c}$, the intrinsic charm (IC) $gc\to gc$ as well as the recombination $gq\to Dc$ partonic mechanisms. The calculations are performed within the $k_T$-factorization approach and the hybrid model using different unintegrated parton distribution functions (uPDFs) for gluons from the literature, as well as within the collinear approach. We compare our results to the LHCb data for forward $D^0$-meson production at $\sqrt{s}=13$ TeV for different rapidity bins in the interval $2<y<4.5$. The IC and recombination models are negligible at the LHCb kinematics. Both the mechanisms start to be crucial at larger rapidities and dominate over the standard charm production mechanisms. At high energies there are so far no experiments probing this region. We present also energy distributions for forward electron, muon and tau neutrinos to be measured at the LHC by the currently operating FASER$\nu$ experiment, as well as by future experiments like FASER$\nu 2$ or FLArE, proposed very recently by the Forward Physics Facility project. Again components of different mechanisms are shown separately. For all kinds of neutrinos (electron, muon, tau) the subleading contributions, i.e. the IC and/or the recombination, dominate over light meson (pion, kaon) and the standard charm production contribution driven by fusion of gluons for neutrino energies $E_{\nu }\gtrsim 300$ GeV. For electron and muon neutrinos both the mechanisms lead to a similar production rates and their separation seems rather impossible. On the other hand, for ${\nu }_{\tau }+{\bar{\nu }}_{\tau }$ neutrino flux the recombination is further reduced making the measurement of the IC contribution very attractive.

arXiv comment26 pages, 16 figures. arXiv admin note: text overlap with arXiv:2206.02750

References in corpus (40)

• An Introduction to PYTHIA 8.2
• Parton distributions in the LHC era: MMHT 2014 PDFs
• Theoretical predictions for charm and bottom production at the LHC
• The Color Glass Condensate and hadron production in the forward region
• Atmospheric Muon Flux at Sea Level, Underground, and Underwater
• Unintegrated parton distributions and inclusive jet production at HERA
• Inclusive Charmed-Meson Production at the CERN LHC
• The Forward Physics Facility: Sites, Experiments, and Physics Potential
• Detecting and Studying High-Energy Collider Neutrinos with FASER at the LHC
• Measurements of prompt charm production cross-sections in $pp$ collisions at $\sqrt{s}=13\mathrm{TeV}$
• Improved TMD factorization for forward dijet production in dilute-dense hadronic collisions
• Combined analysis of charm-quark fragmentation-fraction measurements
• Forward Jet Production at the Large Hadron Collider
• Evidence for intrinsic charm quarks in the proton
• CT14 Intrinsic Charm Parton Distribution Functions from CTEQ-TEA Global Analysis
• Open charm production at the LHC - $k_t$-factorization approach
• Forward Neutrino Fluxes at the LHC
• The Leading Particle Effect from Heavy-Quark Recombination
• Measurement of electrons from semileptonic heavy-flavor hadron decays in pp collisions at $\sqrt{s}=2.76$ TeV
• Far-forward neutrinos at the Large Hadron Collider
• Absolute Branching Fraction Measurements for D^+ and D^0 Inclusive Semileptonic Decays
• Hard scale dependent gluon density, saturation and forward-forward dijet production at the LHC
• Charm-Anticharm Asymmetries in Photoproduction from Heavy-Quark Recombination
• Consistent treatment of charm production in higher-orders at tree-level within $k_T$-factorization approach
• B Production Asymmetries in Perturbative QCD
• IC at IC: IceCube can constrain the intrinsic charm of the proton
• Parton distribution function uncertainties in theoretical predictions for far-forward tau neutrinos at the Large Hadron Collider
• Nonphotonic electrons at RHIC within $k_t$-factorization approach and with experimental semileptonic decay functions
• Intrinsic charm in the nucleon and charm production at large rapidities in collinear, hybrid and $k_T$-factorization approaches
• Inclusive lepton production from heavy-hadron decay in pp collisions at the LHC
• Semileptonic decays of $D_{(s)}$ mesons
• Open charm meson production at BNL RHIC within $k_t$-factorization approach and revision of their semileptonic decays
• Exploring minijets beyond the leading power
• NLO Monte Carlo predictions for heavy-quark production at the LHC: pp collisions in ALICE
• 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
• Impact of intrinsic charm amount in the nucleon and saturation effects on the prompt atmospheric ${\nu }_{\mu }$ flux for IceCube
• Recombination mechanism for $D^0$-meson production and $D^0-\overline{D^0}$ production asymmetry in the LHCb $p+{}^{20}Ne$ fixed-target experiment
• Production asymmetry of ${\nu }_{\tau }$ neutrinos and ${\overline{\nu }}_{\tau }$ antineutrinos from a fixed target experiment SHiP
• QCD predictions for open charm meson production at the LHCb in fixed-target experiment

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