QCD evolution of superfast quarks

Freese, Adam J.; Cosyn, Wim; Sargsian, Misak M.

doi:10.1103/PhysRevD.99.114019

Title: QCD evolution of superfast quarks

Journal Article · Tue Jun 25 00:00:00 EDT 2019 · Physical Review. D.

DOI:https://doi.org/10.1103/PhysRevD.99.114019· OSTI ID:1529402

Freese, Adam J.; Cosyn, Wim; Sargsian, Misak M.

Recent high-precision measurements of nuclear deep inelastic scattering at high x and moderate 6 < Q² < 9 GeV² give a rare opportunity to reach the quark distributions in the superfast region, in which the momentum fraction of the nucleon carried by its constituent quark is larger than the total fraction of the nucleon at rest, x > 1. We derive the leading-order QCD evolution equation for such quarks with the goal of relating the moderate-Q² data to the two earlier measurements of superfast quark distributions at large 60 < Q² < 200 GeV². Since the high-Q² measurements gave strongly contradictory estimates of the nuclear effects that generate superfast quarks, relating them to the high-precision, moderate-Q² data through QCD evolution allows us to clarify this long-standing issue. Our calculations indicate that the moderate-Q² data at x ≲ 1.05 are in better agreement with the high-Q² data measured in (anti)neutrino-nuclear reactions which require substantial high-momentum nuclear effects in the generation of superfast quarks. Our prediction for the high-Q² and x > 1.1 region is somewhat in the middle of the neutrino-nuclear and muon-nuclear scattering data.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: FG02-01ER41172; AC02-06CH1135; 2017-058-N0; AC02-06CH11357

OSTI ID:: 1529402

Alternate ID(s):: OSTI ID: 1558293

Journal Information:: Physical Review. D., Journal Name: Physical Review. D. Vol. 99 Journal Issue: 11; ISSN 2470-0010

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 2 works

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