Contribution from intrinsic charm production to fixed-target interactions with the SMOG Device at LHCb

Vogt, R.

doi:10.1103/PhysRevC.108.015201

Contribution from intrinsic charm production to fixed-target interactions with the SMOG Device at LHCb

Journal Article · Fri Jul 21 00:00:00 EDT 2023 · Physical Review C

DOI:https://doi.org/10.1103/PhysRevC.108.015201· OSTI ID:1992010

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Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); University of California, Davis, CA (United States)

Intrinsic charm, nonperturbative charm in the hadron wavefunction, has long been speculated but has never been satisfactorily proven. Open charm and 𝐽/𝜓 measurements in a fixed-target configuration at the LHCb searched for this contribution but reported no evidence. $$\overline{D}$$ meson and 𝐽/𝜓 production is calculated for the SMOG fixed-target configuration in the LHCb experiment using a combination of perturbative QCD and intrinsic charm to see whether intrinsic charm would indeed be observable in the SMOG kinematics. Open charm and 𝐽/𝜓 production is calculated to next-to-leading order in perturbative QCD. Because a gas jet nuclear target is used, cold nuclear matter effects are included in the perturbative calculations. The intrinsic charm is calculated assuming production from a |𝑢⁢𝑢⁢𝑑⁢$$\overline{c}$$⁢$$\rangle$$ Fock state. The differential rapidity and transverse momentum distributions in 𝑝+Ne, 𝑝+He, and 𝑝+Ar fixed-target interactions are calculated in the SMOG acceptance and compared to data. The predicted asymmetries between $$\overline{D}$$ (leading charm) and 𝐷 (nonleading charm) are also shown. The contribution from intrinsic charm is small and decreases with center-of-mass energy. The calculations agree well with the current SMOG data, with or without intrinsic charm.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: AC52-07NA27344; SC0023547

OSTI ID:: 1992010

Alternate ID(s):: OSTI ID: 1999735
OSTI ID: 2925338

Report Number(s):: LLNL-JRNL--847208

Journal Information:: Physical Review C, Journal Name: Physical Review C Journal Issue: 1 Vol. 108; ISSN 2469-9985; ISSN 2469-9993

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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