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- Title
Time-dependent study of K<sub>S</sub> → π<sup>+</sup>π<sup>−</sup> decays for flavour physics measurements.
- Authors
Pakhlov, P.; Popov, V.
- Abstract
Nowadays High Energy Physics experiments can accumulate unprecedented statistics of heavy flavour decays that allows to apply new methods, based on the study of very rare phenomena, which used to be just desperate. In this paper we propose a new method to measure composition of K0- K ¯ 0, produced in a decay of heavy hadrons. This composition contains important information, in particular about weak and strong phases between amplitudes of the produced K0 and K ¯ 0. We consider possibility to measure these parameters with time-dependent K0 → π+π− analysis. Due to C P -violation in kaon mixing time-dependent decay rates of K0 and K ¯ 0 differ, and the initial amplitudes revealed in the CP-violating decay pattern. We perform phenomenological study of K0 decay evolution initially produced as a combination a K 0 t + b K ¯ 0 t , where a and b, complex amplitudes, could also be dependent on decay time of heavy mother particle. In particular we consider cases of charmed hadrons decays: D+ → K0π+, D s + → K0K+, Λ → pK0 and with some assumptions D0 → K0π0. This can be used to test the sum rule for charmed mesons and to obtain input for the full constraint of the two body amplitudes of D-mesons.
- Subjects
PARTICLE physics; HADRON decay; MESONS; PHYSICS; PHYSICS experiments
- Publication
Journal of High Energy Physics, 2021, Vol 2021, Issue 9, p1
- ISSN
1126-6708
- Publication type
Article
- DOI
10.1007/JHEP09(2021)092