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Title: QCD evolution of superfast quarks

Abstract

Recent high-precision measurements of nuclear deep inelastic scattering at high x and moderate 6 < Q 2 < 9 GeV 2 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-Q 2 data to the two earlier measurements of superfast quark distributions at large 60 < Q 2 < 200 GeV 2. Since the high-Q 2 measurements gave strongly contradictory estimates of the nuclear effects that generate superfast quarks, relating them to the high-precision, moderate-Q 2 data through QCD evolution allows us to clarify this long-standing issue. Our calculations indicate that the moderate-Q 2 data at x ≲ 1.05 are in better agreement with the high-Q 2 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-Q 2 and x > 1.1 region is somewhat in the middle of the neutrino-nuclear and muon-nuclear scattering data.

Authors:
 [1];  [2];  [3]
  1. Argonne National Lab. (ANL), Argonne, IL (United States)
  2. Ghent Univ., Ghent (Belgium)
  3. Florida Intl Univ., Miami, FL (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
1529402
Alternate Identifier(s):
OSTI ID: 1558293
Grant/Contract Number:  
AC02-06CH11357; FG02-01ER41172; AC02-06CH1135; 2017-058-N0
Resource Type:
Journal Article: Published Article
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 99; Journal Issue: 11; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats

Freese, Adam J., Cosyn, Wim, and Sargsian, Misak M. QCD evolution of superfast quarks. United States: N. p., 2019. Web. doi:10.1103/PhysRevD.99.114019.
Freese, Adam J., Cosyn, Wim, & Sargsian, Misak M. QCD evolution of superfast quarks. United States. doi:10.1103/PhysRevD.99.114019.
Freese, Adam J., Cosyn, Wim, and Sargsian, Misak M. Tue . "QCD evolution of superfast quarks". United States. doi:10.1103/PhysRevD.99.114019.
@article{osti_1529402,
title = {QCD evolution of superfast quarks},
author = {Freese, Adam J. and Cosyn, Wim and Sargsian, Misak M.},
abstractNote = {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.},
doi = {10.1103/PhysRevD.99.114019},
journal = {Physical Review D},
issn = {2470-0010},
number = 11,
volume = 99,
place = {United States},
year = {2019},
month = {6}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1103/PhysRevD.99.114019

Figures / Tables:

FIG. 1 FIG. 1: Comparison of evolution equation results for the per nucleon F2A of 12C to experimental measurements. The structure function is multiplied by 10−ix in order to separate the curves; the values of ix for each x value are given in the plot. The solid curves incorporate evolution in themore » fit (see Sec. V), the dashed curves are the result of QCD evolution in which as an input we used the fit of Ref. [23] (see discussion in Sec. IV).« less

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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.