Charge symmetry breaking effects in pion and kaon structure
Abstract
Charge symmetry breaking (CSB) effects associated with the u and d quark mass difference are investigated in the quark distribution functions and spacelike electromagnetic form factors of the pion and kaon. We use a confining version of the Nambu-Jona-Lasimo model, where CSB effects at the infrared scale associated with the model are driven by the dressed u and d quark mass ratio, which because of dynamical chiral symmetry breaking is much closer to unity than the associated current quark mass ratio. The pion and kaon are given as bound states of a dressed quark and a dressed antiquark governed by the Bethe-Salpeter equation, and exhibit the properties of Goldstone bosons, with a pion mass difference given by m(Pi)+(2) - m(Pi)0(2) (m(u) - m(d))(2) as demanded by dynamical chiral symmetry breaking. We find significant CSB effects for realistic current quark mass ratios (m(u)/m(d) similar to 0.5) in the quark flavor-sector electromagnetic form factors of both the pion and kaon. For example, the difference between the u and d quark contributions to the Pi(+) electromagnetic form factors is about 8% at a momentum transfer of Q(2) = 10 GeV2, while the analogous effect for the light quark sector form factors in themore »
- Authors:
-
- Asia Pacific Center for Theoretical Physics, Pohang (Korea, Republic of)
- Tokai Univ., Kanagawa (Japan); Inst. of Physical and Chemical Research (RIKEN), Wako (Japan)
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Univ. of Adelaide, SA (Australia)
- Publication Date:
- Research Org.:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- Australian Research Council; USDOE Office of Science (SC), Nuclear Physics (NP)
- OSTI Identifier:
- 1461463
- Alternate Identifier(s):
- OSTI ID: 1437521
- Grant/Contract Number:
- AC02-06CH11357; 2016-098-N0; 2017-058-N0
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review C
- Additional Journal Information:
- Journal Volume: 97; Journal Issue: 5; Journal ID: ISSN 2469-9985
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 73 NUCLEAR PHYSICS AND RADIATION PHYSICS
Citation Formats
Hutauruk, Parada T. P., Bentz, Wolfgang, Cloët, Ian C., and Thomas, Anthony W. Charge symmetry breaking effects in pion and kaon structure. United States: N. p., 2018.
Web. doi:10.1103/PhysRevC.97.055210.
Hutauruk, Parada T. P., Bentz, Wolfgang, Cloët, Ian C., & Thomas, Anthony W. Charge symmetry breaking effects in pion and kaon structure. United States. https://doi.org/10.1103/PhysRevC.97.055210
Hutauruk, Parada T. P., Bentz, Wolfgang, Cloët, Ian C., and Thomas, Anthony W. Thu .
"Charge symmetry breaking effects in pion and kaon structure". United States. https://doi.org/10.1103/PhysRevC.97.055210. https://www.osti.gov/servlets/purl/1461463.
@article{osti_1461463,
title = {Charge symmetry breaking effects in pion and kaon structure},
author = {Hutauruk, Parada T. P. and Bentz, Wolfgang and Cloët, Ian C. and Thomas, Anthony W.},
abstractNote = {Charge symmetry breaking (CSB) effects associated with the u and d quark mass difference are investigated in the quark distribution functions and spacelike electromagnetic form factors of the pion and kaon. We use a confining version of the Nambu-Jona-Lasimo model, where CSB effects at the infrared scale associated with the model are driven by the dressed u and d quark mass ratio, which because of dynamical chiral symmetry breaking is much closer to unity than the associated current quark mass ratio. The pion and kaon are given as bound states of a dressed quark and a dressed antiquark governed by the Bethe-Salpeter equation, and exhibit the properties of Goldstone bosons, with a pion mass difference given by m(Pi)+(2) - m(Pi)0(2) (m(u) - m(d))(2) as demanded by dynamical chiral symmetry breaking. We find significant CSB effects for realistic current quark mass ratios (m(u)/m(d) similar to 0.5) in the quark flavor-sector electromagnetic form factors of both the pion and kaon. For example, the difference between the u and d quark contributions to the Pi(+) electromagnetic form factors is about 8% at a momentum transfer of Q(2) = 10 GeV2, while the analogous effect for the light quark sector form factors in the K+ and K-0 is about twice as large. For the parton distribution functions we find CSB effects which are considerably smaller than those found in the electromagnetic form factors.},
doi = {10.1103/PhysRevC.97.055210},
journal = {Physical Review C},
number = 5,
volume = 97,
place = {United States},
year = {Thu May 17 00:00:00 EDT 2018},
month = {Thu May 17 00:00:00 EDT 2018}
}
Web of Science
Figures / Tables:
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Works referencing / citing this record:
Valence-quark distributions of pions and kaons in a nuclear medium
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Valence-quark distributions of pions and kaons in a nuclear medium
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