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Статья

Isken, T.
Triangle and Box Diagrams in Coupled-Channel Systems from the Chiral Lagrangian / T.Isken, X.-Y.Guo, Yonggoo Heo, [a.o.] // Physical Review D [Electronic resource]. – 2024. – Vol. 109, No. 3. – P. 034032. – URL: https://doi.org/10.1103/PhysRevD.109.034032. – Bibliogr.: 70.

We perform an analysis of triangle- and box-loop contributions to the generalized potential in the scattering of Goldstone bosons off the J&sup(P)=0*- and 1*- charmed mesons. Particular emphasis is put on the use of on-shell mass parameters in such contributions in terms of a renormalization scheme that ensures the absence of power-counting violating terms. This is achieved with a systematically extended set of Passarino-Veltman basis functions that leads to manifest power-counting conserving one-loop expressions and avoids the occurrence of superficial kinematical singularities. Compact expressions to chiral order three and four are presented that are particularly useful in coding such coupled-channel systems. Our formal results are generic and prepare analogous computations for other systems, like meson-baryon scattering from the chiral Lagrangian.



ОИЯИ = ОИЯИ (JINR)2024
Спец.(статьи,препринты) = С 324.1д - Квантовая хромодинамика$
Спец.(статьи,препринты) = С 324.1б - Сильные взаимодействия. Электромагнитная структура частиц. Алгебра токов. Киральные теории. Теория Редже$
Ключевых слов = 20/024