Measurement of the leptonic decay width of J/psi using initial state radiation
Date
2016-08-05
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier
Abstract
Using a data set of 2.93 fb(-1) taken at a center-of-mass energy of root s = 3.773 GeV with the BESIII detector at the BEPCII collider, we measure the process e(+) e(-) -> J/psi gamma -> mu(+)mu(-)gamma and determine the product of the branching fraction and the electronic width B-mu mu . Gamma(ee) = (333.4 +/- 2.5(stat) +/- 4.4(sys)) eV. Using the earlier-published BESIII result for B-mu mu = (5.973 +/- 0.007(stat) +/- 0.037(sys))%, we derive the J/psi electronic width Gamma(ee) = (5.58 +/- 0.05(stat) +/- 0.08(sys)) keV.
Description
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Keywords
Astronomy & astrophysics, Physics, J/psi resonance, Electronic width, Initial state radiation, BESIII, E(+)E(-) collisions, Cross-section, Final-states
Citation
Ablikim, M. vd. (2016). "Measurement of the leptonic decay width of J/psi using initial state radiation". ed. Metag, V. Physics Letters B, 761, 98-103.