Measurement of the leptonic decay width of J/psi using initial state radiation
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Erişim
info:eu-repo/semantics/openAccessAttribution 3.0 United Stateshttp://creativecommons.org/licenses/by/3.0/us/Tarih
2016Üst veri
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Ablikim, M., Achasov, M. N., Ai, X. C., Albayrak, O., Albrecht, M., Ambrose, D. J., . . . Collaboration, B. (2016). Measurement of the leptonic decay width of J/psi using initial state radiation. Physics Letters B, 761, 98-103. doi:10.1016/j.physletb.2016.08.011Özet
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.
Kaynak
Physics Letters B.Cilt
761Koleksiyonlar
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