Evidence for ηc(2S) in ψ(3686)→γKS0K ±π+π+π-
Date
2013-03-04
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
American Physical Society
Abstract
We search for the M1 radiative transition ψ(3686) →γηc(2S) by reconstructing the exclusive ηc(2S)→KS0K±π+π +π- decay using 1.06×108 ψ(3686) events collected with the BESIII detector. The signal is observed with a statistical significance of greater than 4 standard deviations. The measured mass of the ηc(2S) is 3646.9±1.6(stat)±3.6(syst) MeV/c2, and the width is 9.9±4.8(stat)±2.9(syst) MeV/c2. The product branching fraction is measured to be B(ψ(3686)→γηc(2S)) ×B(ηc(2S)→KS0K±π+π +π-)=(7.03±2.10(stat)±0.70(syst)) ×10-6. This measurement complements a previous BESIII measurement of ψ(3686)→γηc(2S) with ηc(2S)→KS0K±π+ and K +K-π0. © 2013 American Physical Society.
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Keywords
Astronomy & astrophysics, Physics
Citation
Ablikim, M. vd. (2013). "Evidence for ηc(2S) in ψ(3686)→γKS0K ±π+π+π-". Physical Review D - Particles, Fields, Gravitation and Cosmology, 87(5).