Publication: Evidence for ηc→γγ and measurement of J/ψ→3γ
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Authors
Tapan, İlhan
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American Physical Society
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Abstract
The decay of J/psi to three photons is studied using psi (3686) -> pi(+) pi(-) J/psi in a sample of 1.0641 X 10(8) psi (3686) events collected with the BESIII detector. Evidence of the direct decay of eta(c) to two photons, eta(c) -> gamma gamma, is reported, and the product branching fraction is determined to be B(J/psi -> gamma eta(c,) eta(c) -> gamma gamma = (4.5 +/- 1.2 +/- 0.6) X 10(-6), where the first error is statistical and the second is systematic. The branching fraction for J/psi -> 3 gamma is measured to be (11.3 +/- 1.8 +/- 2.0) X 10(-6) with improved precision.
Description
Çalışmada 345 yazar bulunmaktadır. Bu yazarlardan sadece Bursa Uludağ Üniversitesi mensuplarının girişleri yapılmıştır
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Keywords
Astronomy & astrophysics, Physics, Decay-rate, Positronium, Precision
Citation
Ablikim, M. vd. (2013). ''Evidence for ηc→γγ and measurement of J/ψ→3γ''. Physical Review D - Particles, Fields, Gravitation and Cosmology, 87(3).