Электронный каталог

Статья

Ablikim, M.
First Simultaneous Measurement of *X*0 and *X^-*0 Asymmetry Parameters in *q(3686) Decay / M.Ablikim, O.Bakina, I.Boyko, G.Chelkov, D.Dedovich, I.Denysenko, P.Egorov, A.Guskov, Y.Nefedov, S.Pogodin, A.Sarantsev, A.Zhemchugov, [a.o.] // Physical Review D [Electronic resource]. – 2023. – Vol.108, No.1. – P.L011101. – URL: https://doi.org/10.1103/PhysRevD.108.L011101. – Bibliogr.:49.

The Ξ0 asymmetry parameters are measured using entangled quantum Ξ0−¯Ξ0 pairs from a sample of (448.1±2.9)×106  ψ(3686) events collected with the BESIII detector at BEPCII. The relative phase between the transition amplitudes of the Ξ0¯Ξ0 helicity states is measured to be ΔΦ=−0.050±0.150±0.020  rad, which implies that there is no obvious polarization at the current level of statistics. The decay parameters of the Ξ0 hyperon (αΞ0,α¯Ξ0,ϕΞ0,ϕ¯Ξ0) and the angular distribution parameter [αψ(3686)] and ΔΦ are measured simultaneously for the first time. In addition, the CP asymmetry observables are determined to be AΞ0CP=(αΞ0+α¯Ξ0)/(αΞ0−α¯Ξ0)=−0.007±0.082±0.025 and ΔϕΞ0CP=(ϕΞ0+ϕ¯Ξ0)/2=−0.079±0.082±0.010  rad, which are consistent with CP conservation.



ОИЯИ = ОИЯИ (JINR)2023
Спец.(статьи,препринты) = С 332.7 - Встречные е+е- и мю+мю- пучки