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Title: Flavor dependence of the pion and kaon form factors and parton distribution functions

Journal Article · · Physical Review C
 [1];  [2];  [1]
  1. Univ. of Adelaide, SA (Australia). CSSM and ARC Centre of Excellence for Particle Physics at the Terascale, Dept. of Physics
  2. Argonne National Lab. (ANL), Argonne, IL (United States). Physics Division

The separate quark flavor contributions to the pion and kaon valence quark distribution functions are studied, along with the corresponding electromagnetic form factors in the space-like region. The calculations are made using the solution of the Bethe-Salpeter equation for the model of Nambu and Jona-Lasinio with proper-time regularization. Both the pion and kaon form factors and the valence quark distribution functions reproduce many features of the available empirical data. The larger mass of the strange quark naturally explains the empirical fact that the ratio u(K) + (x)/u(pi) + (x) drops below unity at large x, with a value of approximately M$$2\atop{u}$$/Ms$$2\atop{s}$$ as x → 1. With regard to the elastic form factors we report a large flavor dependence, with the u-quark contribution to the kaon form factor being an order of magnitude smaller than that of the s-quark at large Q2, which may be a sensitive measure of confinement effects in QCD. Surprisingly though, the total K+ and π+ form factors differ by only 10%. Lastly, in general we find that flavor breaking effects are typically around 20%.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP); Australian Research Council (ARC)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1374563
Alternate ID(s):
OSTI ID: 1314352
Journal Information:
Physical Review C, Vol. 94, Issue 3; ISSN 2469-9985
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 36 works
Citation information provided by
Web of Science

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Cited By (6)

Kaon form factor in holographic QCD journal September 2019
Valence-quark distributions of pions and kaons in a nuclear medium journal November 2019
Pion and kaon valence quark distribution functions from Dyson-Schwinger equations journal September 2018
Aspects of open-flavour mesons in a comprehensive DSBSE study journal October 2017
Pion and kaon valence quark distribution functions from Dyson-Schwinger equations text January 2018
Valence-quark distributions of pions and kaons in a nuclear medium text January 2019

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