Электронный каталог

Статья

Cortina Gil, E.
Measurement of the K*+  *> *p*+*g*g Decay / E.Cortina Gil, A.Baeva, D.Baigarashev, D.Emelyanov, T.Enik, V.Falaleev, V.Kekelidze, D.Kereibay, A.Korotkova, L.Litov, D.Madigozhin, N.Molokanova, S.Movchan, I.Polenkevich, Yu.Potrebenikov, S.Shkarovskiy, A.Zinchenko, [NA62 Collab.] // Physics Letters B [Electronic resource]. – 2024. – Vol. 850. – P. 138513. – URL: https://doi.org/10.1016/j.physletb.2024.138513. – Bibliogr.: 26.

A sample of 3984 candidates of the K*+  *> *p*+*g*g decay, with an estimated background of 291 *( 14 events, was collected by the NA62 experiment at CERN during 2017–2018. In order to describe the observed di-photon mass spectrum, the next-to-leading order contribution in chiral perturbation theory was found to be necessary. The decay branching ratio in the full kinematic range is measured to be (9.61 *( 0.17) x 10*−*7. The first search for production and prompt decay of an axion-like particle with gluon coupling in the process K*+ *> *p*+a, a *> *g*g is also reported.



Спец.(статьи,препринты) = С 346.5б - Свойства К-мезонов: масса, спин, четность, схемы и времена распадов
ОИЯИ = ОИЯИ (JINR)2024