publication . Article . Other literature type . 2015

Form factors of the isovector scalar current and the \eta \pi

B. Moussallam; B. Moussallam; M. Albaladejo;
Open Access
  • Published: 13 Oct 2015 Journal: The European Physical Journal C, volume 75 (issn: 1434-6044, eissn: 1434-6052, Copyright policy)
  • Publisher: Springer Science and Business Media LLC
Abstract
A model for S-wave eta pi scattering is proposed which could be realistic in an energy range from threshold up to above 1 GeV, where inelasticity is dominated by the K (K) over bar channel. The T-matrix, satisfying two-channel unitarity, is given in a form which matches the chiral expansion results at order p(4) exactly for the eta pi -> eta pi, eta pi -> K (K) over bar amplitudes and approximately for K (K) over bar -> K (K) over bar. It contains six phenomenological parameters. Asymptotic conditions are imposed which ensure a minimal solution of the Muskhelishvili-Omnes problem, thus allowing one to compute the eta pi and K (K) over bar form factor matrix elem...
Subjects
free text keywords: Physics and Astronomy (miscellaneous), Engineering (miscellaneous), [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], Chiral perturbation theory, Final state interaction, Particle physics, Pi, Physics, Scalar (physics), Isovector
Funded by
EC| HADRONPHYSICS3
Project
HADRONPHYSICS3
Study of Strongly Interacting Matter
  • Funder: European Commission (EC)
  • Project Code: 283286
  • Funding stream: FP7 | SP4 | INFRA
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