The persistent nonperturbative charm enigma

Guzzi, Marco; Hobbs, T. J.; Xie, Keping; Huston, J.; Nadolsky, Pavel; Yuan, C. -P.

doi:10.1016/j.physletb.2023.137975

Physics Letters B

2023

DOI: 10.1016/j.physletb.2023.137975

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The persistent nonperturbative charm enigma

Marco Guzzi

T. J. Hobbs

Keping Xie

et al.

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Cited by 20 publications

(1 citation statement)

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“…We continue to distinguish momentum and position-space functions by their argument, see footnote 5.For the meaning of the superscript (1), see also there 14. Power corrections of this kind, which are known as "intrinsic charm" and have received substantial recent interest on the collinear PDF side[95,96], would be an interesting subject to explore in the TMD case in the future. Very recently, the TMD PDFs for charm quarks within Λc baryons, which are leading valence contributions and do not have to be produced from gluons, have been evaluated in a lightfront Hamiltonian model in ref [97]…”

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confidence: 99%

Transverse momentum distributions of heavy hadrons and polarized heavy quarks

von Kuk,

Michel,

Sun

2023

J. High Energ. Phys.

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We initiate the study of transverse momentum-dependent (TMD) fragmentation functions for heavy quarks, demonstrate their factorization in terms of novel nonperturbative matrix elements in heavy-quark effective theory (HQET), and prove new TMD sum rules that arise from heavy-quark spin symmetry. We discuss the phenomenology of heavy-quark TMD FFs at B factories and find that the Collins effect, in contrast to claims in the literature, is not parametrically suppressed by the heavy-quark mass. We further calculate all TMD parton distribution functions for the production of heavy quarks from polarized gluons within the nucleon and use our results to demonstrate the potential of the future EIC to resolve TMD heavy-quark fragmentation in semi-inclusive DIS, complementing the planned EIC program to use heavy quarks as probes of gluon distributions.

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confidence: 99%

Transverse momentum distributions of heavy hadrons and polarized heavy quarks

von Kuk,

Michel,

Sun

2023

J. High Energ. Phys.

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B-meson hadroproduction in the SACOT-mT scheme

Helenius

Paukkunen

2023

J. High Energ. Phys.

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We apply the SACOT-mT general-mass variable flavour number scheme (GM-VFNS) to the inclusive B-meson production in hadronic collisions at next-to-leading order in perturbative Quantum Chromodynamics. In the GM-VFNS approach one matches the fixed-order heavy-quark production cross sections, accurate at low transverse momentum (pT), with the zero-mass cross sections, accurate at high pT. The physics idea of the SACOT-mT scheme is to do this by accounting for the finite momentum transfer required to create a heavy quark-antiquark pair throughout the calculation. We compare our results with the latest LHC data from proton-proton and proton-lead collisions finding a very good agreement within the estimated theoretical uncertainties. We discuss also scheme-related differences and their impact on the scale uncertainties.

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The present and future of QCD

Achenbach,

Adhikari,

Afanasev

et al. 2024

Nuclear Physics A

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The persistent nonperturbative charm enigma

Cited by 20 publications

References 34 publications

Transverse momentum distributions of heavy hadrons and polarized heavy quarks

Transverse momentum distributions of heavy hadrons and polarized heavy quarks

B-meson hadroproduction in the SACOT-mT scheme

The present and future of QCD

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