Bibliographic Details
| Title: |
Measurement of [formula omitted] for ψ(2S) meson. |
| Authors: |
Anashin, V.V.1, Anchugov, O.V.1, Aulchenko, V.M.1,2, Baldin, E.M.1,2, Baranov, G.N.1,3, Barladyan, A.K.1, Barnyakov, A.Yu.1,2, Barnyakov, M.Yu.1,2, Baru, S.E.1,2, Basok, I.Yu.1, Batrakov, A.M.1, Bekhtenev, E.A.1, Blinov, A.E.1,2, Blinov, V.E.1,2,3, Bobrov, A.V.1,2, Bobrovnikov, V.S.1,2, Bogomyagkov, A.V.1,2, Bondar, A.E.1,2, Buzykaev, A.R.1,2, Cheblakov, P.B.1,2 |
| Source: |
Physics Letters B. Jun2018, Vol. 781, p174-181. 8p. |
| Subject Terms: |
*ELECTRONICS, *MUON decay, *LUMINOSITY, *LEPTONS (Nuclear physics), *HADRONIC atoms |
| Abstract: |
The product of the electronic width of the ψ (2S) meson and the branching fraction of its decay to the muon pair was measured in the e + e − → ψ (2S) → μ + μ − process using nine data sets corresponding to an integrated luminosity of about 6.5 pb −1 collected with the KEDR detector at the VEPP-4M electron–positron collider: Γ e e × B μ μ = 19.3 ± 0.3 ± 0.5 eV . Adding the previous KEDR results on hadronic and leptonic channels, the values of the ψ (2S) electronic width were obtained under two assumptions: either with the assumption of lepton universality Γ e e = 2.279 ± 0.015 ± 0.042 keV or without it, summing up hadronic and three independent leptonic channels Γ e e = 2.282 ± 0.015 ± 0.042 keV . [ABSTRACT FROM AUTHOR] |
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| Database: |
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