Charge symmetry breaking effects in pion and kaon structure

Hutauruk, Parada T.  P.; Bentz, Wolfgang; Cloët, Ian C.; Thomas, Anthony W.

doi:10.1103/PhysRevC.97.055210

Title: Charge symmetry breaking effects in pion and kaon structure

Journal Article · Thu May 17 00:00:00 EDT 2018 · Physical Review C

DOI:https://doi.org/10.1103/PhysRevC.97.055210· OSTI ID:1461463

Hutauruk, Parada T. P. ^[1]; Bentz, Wolfgang ^[2]; Cloët, Ian C. ^[3]; Thomas, Anthony W. ^[4]

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)

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.

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

Sponsoring Organization:: Australian Research Council; USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: AC02-06CH11357; 2016-098-N0; 2017-058-N0

OSTI ID:: 1461463

Alternate ID(s):: OSTI ID: 1437521

Journal Information:: Physical Review C, Vol. 97, Issue 5; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 11 works

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