Publication: Precision measurements of B[ψ(3686)→π+ π-J/ψ] and B[J/ψ→l+l-]
Date
Authors
Tapan, İlhan
Authors
Advisor
Language
Type
Publisher:
American Physical Society
Journal Title
Journal ISSN
Volume Title
Abstract
Based on (106.41 +/- 0.86) x 10(6) psi(3686) events collected with the BESIII detector at the BEPCII collider, the branching fractions of psi(3686) -> pi(+)pi(-)J/psi, J/psi -> e(+)e(-), and J/psi -> mu(+)mu(-) are measured. We obtain B[psi(3686) -> pi(+)pi(-)J/psi] = (34.98 +/- 0.02 +/- 0.45)%, B[J/psi -> e(+)e(-)] = (5.983 +/- 0.007 +/- 0.037)%, and B[J/psi -> mu(+)mu(-)] = (5.973 +/- 0.0007 +/- 0.038)%. The measurement of B[psi(3686) -> pi(+)pi(-)J/psi] confirms the CLEO-c measurement, and is apparently larger than the others. The measured J/psi leptonic decay branching fractions agree with previous experiments within one standard deviation. These results lead to B[J/psi -> l(+)l(-)] = (5.978 +/- 0.005 +/- 0.040)% by averaging over the e(+)e(-) and mu(+)mu(-) channels and a ratio of B[J/psi -> e(+)e(-)]/B[J/psi -> mu(+)mu(-)] = 1.0017 +/- 0.0017 +/- 0.0033, which tests e- mu universality at the four tenths of a percent level. All the measurements presented in this paper are the most precise in the world to date.
Description
Çalışmada 363 yazar bulunmaktadır. Bu yazarlardan sadece Bursa Uludağ Üniversitesi mensuplarının girişleri yapılmıştır
Source:
Keywords:
Keywords
Astronomy & astrophysics, Physics, Hadronic transitions, Quarkonium
Citation
Ablikim, M. vd. (2013). "Precision measurements of B[ψ(3686)→π+ π-J/ψ] and B[J/ψ→l+l-]". Physical Review D - Particles, Fields, Gravitation and Cosmology, 88(3).