Электронный каталог

Статья

Balev, S.
First Observation and Study of the K&sup(*() *> *p*0*p*0*m&sup(*()*n Decay / S.Balev, P.L.Frabetti, E.Gersabeck, E.Goudzovski, P.Hristov, V.Kekelidze, A.Korotkova, V.Kozhuharov, L.Litov, D.Madigozhin, N.Molokanova, I.Polenkevich, Yu.Potrebenikov, S.Stoynev, A.Zinchenko, [NA48/2 Collab.] // Journal of High Energy Physics [Electronic resource]. – 2024. – Vol. 2024, No. 3. – P. 137. – URL: https://doi.org/10.1007/JHEP03(2024)137. – Bibliogr.: 18.

The NA48/2 experiment at CERN reports the first observation of the K± → π0π0μ±ν decay based on a sample of 2437 candidates with 15% background contamination collected in 2003–2004. The decay branching ratio in the kinematic region of the squared dilepton mass above 0.03 GeV2/c4 is measured to be (0.65 ± 0.03) × 10−6. The extrapolation to the full kinematic space, using a specific model, is found to be (3.45 ± 0.16) × 10−6, in agreement with chiral perturbation theory predictions.



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