Электронный каталог

Статья

Nurlan, K.
Investigation of Vertex a&sub(1 )*> VP for Hadronic *t Decays / K.Nurlan // Вестник Евразийского национального университета им. Л.Н.Гумилева. Сер. Физика. Астрономия [Электронный ресурс]. – 2024. – № 2 (147). – P. 20-27. – URL: https://doi.org/10.32523/2616-6836-2024-147-2-20-27. – Bibliogr.: p. 25-26.

In the framework of U(3) symmetric quark model, triangular diagrams are calculated that describe the strongly interacting vertices a&sub(1)→ρπ and a&sub(1)→K^* K. The divergences arising when considering quark loops are regularized by covariant cut off parameter. Based on four-particle hadronic τ decays, the quark structure of the a_1 resonance with quantum numbers J&sup(P)C=1^(++) was studied. Theoretical estimates of intermediate channels with the a&sub(1) meson for the partial decay widths of τ→πππν&sub(τ), τ→KKπν&sub(τ) and τ→KKην&sub(τ) are obtained. Contributions from contact channels describing the direct production of 3π, KKπ and KKη mesons by τ lepton current are taken into account. The interference of contact and intermediate axial-vector channels in determining the integral decay widths is studied. The matrix elements of the processes are obtained in the leading approximation of 1/N&sub(C) expansion.It is shown that calculations on τlepton mesonic decays confirm the quark-antiquark structure of the a_1 meson and clarify the role of the intermediate non-strange axial-vector channel in determining the integral partial decay widths. The obtained results are compared with experimental data by BaBar and Belle collaborations at the BEPC II and KEK lepton colliders.



ОИЯИ = ОИЯИ (JINR)2024
Спец.(статьи,препринты) = С 324.1б - Сильные взаимодействия. Электромагнитная структура частиц. Алгебра токов. Киральные теории. Теория Редже$
Бюллетени = 9/025