Analysis of the nonleptonic two-body decays of the Λ hyperon

Analysis of the nonleptonic two-body decays of the Λ hyperon

Bibliographic Details
Parent link:Physical Review D: covering particles, fields, gravitation, and cosmology
Vol. 104, iss. 7.— 2021.— [074004, 10 p.]
Corporate Author: Национальный исследовательский Томский политехнический университет Школа базовой инженерной подготовки Отделение математики и информатики
Other Authors: Ivanov M. A. Mikhail Alekseevich, Korner J. G. Juergen, Lyubovitskiy (Lyubovitskij) V. E. Valery Efimovich, Tyulemisov Zh. Zhomart
Summary:Title screen
We systematically study two-body nonleptonic decays of light lambda hyperon Λ→pπ−(nπ0) with account for both short- and long-distance effects. The short-distance effects are induced by five topologies of external and internal weak W± exchange, while long-distance effects are saturated by an inclusion of the so-called pole diagrams with intermediate 12+ and 12− baryon resonances. The contributions from 12+ resonances are calculated straightforwardly by account for nucleon and Σ baryons whereas the contributions from 12− resonances are calculated by using the well-known soft-pion theorem in the current-algebra approach. It allows one to express the parity-violating S-wave amplitude in terms of parity-conserving matrix elements. From our previous analysis of heavy baryons we know that short-distance effects induced by internal topologies are not suppressed in comparison with external W-exchange diagram and must be included for description of data. Here, in the case of Λ decays we found that the contribution of external and internal W-exchange diagrams is sizably suppressed, e.g., by one order of magnitude in comparison with data, which are known with quite good accuracy. Pole diagrams play the major role to get consistency with experiment.
Режим доступа: по договору с организацией-держателем ресурса
Language:English
Published: 2021
Subjects:
электронный ресурс
труды учёных ТПУ
Online Access:https://doi.org/10.1103/PhysRevD.104.074004
Format: Electronic Book Chapter
KOHA link:https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=668030

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