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Title: Nonperturbative strange-quark sea from lattice QCD, light-front holography, and meson-baryon fluctuation models

Abstract

Here, we demonstrate that a nonzero strangeness contribution to the spacelike electromagnetic form factor of the nucleon is evidence for a strange-antistrange asymmetry in the nucleon’s light-front wave function, thus implying different nonperturbative contributions to the strange and antistrange quark distribution functions. A recent lattice QCD calculation of the nucleon strange quark form factor predicts that the strange quark distribution is more centralized in coordinate space than the antistrange quark distribution, and thus the strange quark distribution is more spread out in light-front momentum space. We show that the lattice prediction implies that the difference between the strange and antistrange parton distribution functions, s(x)–¯s(x), is negative at small-x and positive at large-x. We also evaluate the strange quark form factor and s(x)–¯s(x) using a baryon-meson fluctuation model and a novel nonperturbative model based on light-front holographic QCD. This procedure leads to a Veneziano-like expression of the form factor, which depends exclusively on the twist of the hadron and the properties of the Regge trajectory of the vector meson which couples to the quark current in the hadron. The holographic structure of the model allows us to introduce unambiguously quark masses in the form factors and quark distributions preserving the hardmore » scattering counting rule at large-Q 2 and the inclusive counting rule at large-x. Quark masses modify the Regge intercept which governs the small-x behavior of quark distributions, therefore modifying their small-x singular behavior. Both nonperturbative approaches provide descriptions of the strange-antistrange asymmetry and intrinsic strangeness in the nucleon consistent with the lattice QCD result.« less

Authors:
 [1];  [2];  [3];  [4];  [5];  [1];  [6];  [7]
  1. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  2. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Duke Univ., Durham, NC (United States)
  3. Univ. de Costa Rica, San Jose (Costa Rica)
  4. Institut fur Theoretische Physik der Univ., Heidelberg (Germany)
  5. Stanford Univ., Stanford, CA (United States). SLAC National Accelerator Lab.
  6. Southern Connecticut State Univ., New Haven, CT (United States)
  7. Peking Univ., Beijing (China); Collaborative Innovation Center of Quantum Matter, Beijing (China); Peking Univ. Beijing (China)
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Contributing Org.:
HLFHS Collaboration
OSTI Identifier:
1485192
Alternate Identifier(s):
OSTI ID: 1485272; OSTI ID: 1490363
Report Number(s):
JLAB-THY-18-2803; DOE/OR/23177-4532; arXiv:1809.04975
Journal ID: ISSN 2470-0010; PRVDAQ
Grant/Contract Number:  
AC05-06OR23177; FG02-03ER41231; AC02-76SF00515; 11775118; 11475006
Resource Type:
Published Article
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 98; Journal Issue: 11; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English

Citation Formats

Sufian, Raza Sabbir, Liu, Tianbo, de Téramond, Guy F., Dosch, Hans Günter, Brodsky, Stanley J., Deur, Alexandre, Islam, Mohammad T., and Ma, Bo -Qiang. Nonperturbative strange-quark sea from lattice QCD, light-front holography, and meson-baryon fluctuation models. United States: N. p., 2018. Web. doi:10.1103/PhysRevD.98.114004.
Sufian, Raza Sabbir, Liu, Tianbo, de Téramond, Guy F., Dosch, Hans Günter, Brodsky, Stanley J., Deur, Alexandre, Islam, Mohammad T., & Ma, Bo -Qiang. Nonperturbative strange-quark sea from lattice QCD, light-front holography, and meson-baryon fluctuation models. United States. doi:10.1103/PhysRevD.98.114004.
Sufian, Raza Sabbir, Liu, Tianbo, de Téramond, Guy F., Dosch, Hans Günter, Brodsky, Stanley J., Deur, Alexandre, Islam, Mohammad T., and Ma, Bo -Qiang. Mon . "Nonperturbative strange-quark sea from lattice QCD, light-front holography, and meson-baryon fluctuation models". United States. doi:10.1103/PhysRevD.98.114004.
@article{osti_1485192,
title = {Nonperturbative strange-quark sea from lattice QCD, light-front holography, and meson-baryon fluctuation models},
author = {Sufian, Raza Sabbir and Liu, Tianbo and de Téramond, Guy F. and Dosch, Hans Günter and Brodsky, Stanley J. and Deur, Alexandre and Islam, Mohammad T. and Ma, Bo -Qiang},
abstractNote = {Here, we demonstrate that a nonzero strangeness contribution to the spacelike electromagnetic form factor of the nucleon is evidence for a strange-antistrange asymmetry in the nucleon’s light-front wave function, thus implying different nonperturbative contributions to the strange and antistrange quark distribution functions. A recent lattice QCD calculation of the nucleon strange quark form factor predicts that the strange quark distribution is more centralized in coordinate space than the antistrange quark distribution, and thus the strange quark distribution is more spread out in light-front momentum space. We show that the lattice prediction implies that the difference between the strange and antistrange parton distribution functions, s(x)–¯s(x), is negative at small-x and positive at large-x. We also evaluate the strange quark form factor and s(x)–¯s(x) using a baryon-meson fluctuation model and a novel nonperturbative model based on light-front holographic QCD. This procedure leads to a Veneziano-like expression of the form factor, which depends exclusively on the twist of the hadron and the properties of the Regge trajectory of the vector meson which couples to the quark current in the hadron. The holographic structure of the model allows us to introduce unambiguously quark masses in the form factors and quark distributions preserving the hard scattering counting rule at large-Q2 and the inclusive counting rule at large-x. Quark masses modify the Regge intercept which governs the small-x behavior of quark distributions, therefore modifying their small-x singular behavior. Both nonperturbative approaches provide descriptions of the strange-antistrange asymmetry and intrinsic strangeness in the nucleon consistent with the lattice QCD result.},
doi = {10.1103/PhysRevD.98.114004},
journal = {Physical Review D},
number = 11,
volume = 98,
place = {United States},
year = {2018},
month = {12}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1103/PhysRevD.98.114004

Citation Metrics:
Cited by: 3 works
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Figures / Tables:

FIG. 1 FIG. 1: Nonzero form factor F1(Q2) (right panel) from asymmetric sea quark and antiquark distributions in transverse LF coordinate space (left panel). The dashed-dotted curves (blue) represent the quark, the dashed curves (red) represent the antiquark, and the continuous curves (black) represent q− q̄. The quark/antiquark number is normalized tomore » 1 in this figure.« less

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