Электронный каталог

Статья

Ablikim, M.
Observation of Significant Flavor-SU(3) Breaking in the Kaon Wave Function at 12 < Q*2 < 25 GeV*2 and Discovery of the Charmless Decay *q(3770) *> K*0&sub(S)K*0&sub(L) / M.Ablikim, O.Bakina, I.Boyko, G.Chelkov, D.Dedovich, I.Denysenko, P.Egorov, A.Guskov, Y.Nefedov, A.Sarantsev, A.Zhemchugov, [a.o.] // Physical Review Letters [Electronic resource]. – 2024. – Vol. 132, No. 13. – P. 131901. – URL: https://doi.org/10.1103/PhysRevLett.132.131901. – Bibliogr.: 49.

We present cross sections for the reaction eþe− → K0 S K0 L at center-of-mass energies ranging from 3.51 to 4.95 GeV using data samples collected in the BESIII experiment, corresponding to a total integrated luminosity of 26.5 fb−1. The ratio of neutral-to-charged kaon form factors at large momentum transfers (12 < Q2 < 25 GeV2) is determined to be 0.21 *( 0.01, which indicates a small but significant effect of flavor-SU(3) breaking in the kaon wave function, and, consequently, excludes the possibility that flavor-SU (3) breaking is the primary reason for the strong experimental violation of the pQCD prediction |F(π*()|/|F(K*()|=f*2&sub(*p)/f*2&sub(K) , where F(*p*() and F(K*() are the form factors, and fπ and f K are the decay constants of charged pions and kaons, respectively. We also observe a significant signal for the charmless decay ψð3770Þ → K0 S K0 L for the first time. Within a 1σ contour of the likelihood value, the branching fraction for ψð3770Þ → K0 S K0 L is determined to be B ¼ ð2.63þ1.40 −1.59 Þ × 10−5, and the relative phase between the continuum and ψð3770Þ amplitudes is ϕ ¼ ð−0.39þ0.05 −0.10 Þπ. The branching fraction is in good agreement with the S- and D-wave charmonia mixing scheme proposed in the interpretation of the “ρπ puzzle” between J=ψ and ψð3686Þ decays.



ОИЯИ = ОИЯИ (JINR)2024
Спец.(статьи,препринты) = С 346.6д1 - Чармоний, боттомоний, топ-кварк. Очарованные частицы и др. резонансы из тяжелых кварков
Спец.(статьи,препринты) = С 346.6д - Прочие резонансы