Using 4.479x10^8 psiˆ(3686) events collected with the BESIII detector, we search for the decays psi(3686)-->’e+e-chi_cj and chi_cJ-->e+e-Jpsi, where J=0, 1, 2. The decays psi(3686)-->’e+e-chi_cj and chi_cj-->’e+e-Jpsi are observed for the first time. The measured branching fractions are B(psi(3686)-->e+e-chi_cj)=(11.7±2.5±1.0)x10-4, (8.6±0.3±0.6)10-4, (6.9±0.5±0.6)x10-4 for J=0, 1, 2, and B(chi_cj-->e+e-Jpsiˆ)=(1.51±0.30±0.13)x10-4, (3.73±0.09±0.25)x10-3, (2.48±0.08±0.16)x10-3 for J=0, 1, 2, respectively. The ratios of the branching fractions B(psi(3686)-->e+e-chi_cj)/B(psi(3686)-->gamma chi_cj) and B(chi_cj --> e+e-Jpsi)/B(chi_cj --> gamma Jpsi) are also reported. Also, the alpha values of helicity angular distributions of the e+e- pair are determined for psi(3686)-->e+e-chi_c1,2 and chi_c1,2-->e+e-Jpsi.

Observation of psi(3686) --> e+e-chi_cJ and chi_cJ --> e+e-Jpsi

FARINELLI, Riccardo;GARZIA, Isabella;
2017

Abstract

Using 4.479x10^8 psiˆ(3686) events collected with the BESIII detector, we search for the decays psi(3686)-->’e+e-chi_cj and chi_cJ-->e+e-Jpsi, where J=0, 1, 2. The decays psi(3686)-->’e+e-chi_cj and chi_cj-->’e+e-Jpsi are observed for the first time. The measured branching fractions are B(psi(3686)-->e+e-chi_cj)=(11.7±2.5±1.0)x10-4, (8.6±0.3±0.6)10-4, (6.9±0.5±0.6)x10-4 for J=0, 1, 2, and B(chi_cj-->e+e-Jpsiˆ)=(1.51±0.30±0.13)x10-4, (3.73±0.09±0.25)x10-3, (2.48±0.08±0.16)x10-3 for J=0, 1, 2, respectively. The ratios of the branching fractions B(psi(3686)-->e+e-chi_cj)/B(psi(3686)-->gamma chi_cj) and B(chi_cj --> e+e-Jpsi)/B(chi_cj --> gamma Jpsi) are also reported. Also, the alpha values of helicity angular distributions of the e+e- pair are determined for psi(3686)-->e+e-chi_c1,2 and chi_c1,2-->e+e-Jpsi.
2017
Ablikim, M.; Achasov, M. N.; Ai, X. C.; Albayrak, O.; Albrecht, M.; Ambrose, D. J.; Amoroso, A.; An, F. F.; An, Q.; Bai, J. Z.; Baldini Ferroli, R.; B...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/2374766
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