منابع مشابه
Pion mass and decay constant
Independent of assumptions about the form of the quark-antiquark scattering kernel we derive the explicit relation between the pion Bethe-Salpeter amplitude, Γπ, and the quark propagator in the chiral limit; Γπ necessarily involves a non-negligible γ5γ · P term (P is the pion four-momentum). We also obtain exact expressions for the pion decay constant, fπ, and mass, both of which depend on Γπ; ...
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K.M. Lynch, J. Billowes, M. L. Bissell, I. Budinc̆ević, T. E. Cocolios, R. P. De Groote, S. De Schepper, V. N. Fedosseev, K. T. Flanagan, S. Franchoo, R. F. Garcia Ruiz, H. Heylen, B. A. Marsh, G. Neyens, T. J. Procter, R. E. Rossel, S. Rothe, I. Strashnov, H. H. Stroke, and K. D. A. Wendt School of Physics and Astronomy, The University of Manchester, Manchester M13 9PL, United Kingdom ISOLDE, P...
متن کاملPion Rescattering in Two-Pion Decay of Heavy Quarkonia
The role of pion rescattering in ππ decay of radially excited heavy quarkonia modeled in terms of a Qππ coupling, is investigated within the framework of the covariant Blankenbecler-Sugar equation. The effects of pion rescattering (or pion exchange) are shown to be large, unless the coupling of the two-pion system to the heavy quarks is mediated by a fairly light scalar σ meson, which couples t...
متن کاملElectromagnetic Pion Form Factor and Neutral Pion Decay Width
The electromagnetic pion form factor, Fπ(q 2), is calculated for spacelike-q2 in impulse approximation using a confining quark propagator, S, and a dressed quarkphoton vertex, Γμ, obtained from realistic, nonperturbative Dyson-Schwinger equation studies. Good agreement with the available data is obtained for Fπ(q 2) and other pion observables, including the decay π0 → γ γ. This calculation sugg...
متن کاملPion-pion scattering and the K → 3π decay amplitudes
We revisit the recently proposed method for the determination of the ππ scattering length combination a0 − a2, based on the study of the π0π0 spectrum in K+ → π+π0π0 . In view of a precision measurement, we discuss here the effects due to smaller absorptive contributions to the K+ → π+π0π0 and K+ → π+π+π− amplitudes. We outline a method of analysis that can lead to a precision determination of ...
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ژورنال
عنوان ژورنال: Physical Review D
سال: 2020
ISSN: 2470-0010,2470-0029
DOI: 10.1103/physrevd.102.073006