Measurement of J/ψ→γηc decay rate and ηc parameters at KEDR

Measurement of J/ψ→γηc decay rate and ηc parameters at KEDR

Using the inclusive photon spectrum based on a data sample collected at the J/ψ peak with the KEDR detector at the VEPP-4M e+e− collider, we measured the rate of the radiative decay J/ψ→γηc as well as ηc mass and width. Taking into account an asymmetric photon lineshape we obtained Γγηc0=2.98±0.18−0...

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Veröffentlicht in:Physics letters. B 2014-11, Vol.738, p.391-396
Hauptverfasser: Anashin, V.V., Aulchenko, V.M., Baldin, E.M., Barladyan, A.K., Barnyakov, A.Yu, Barnyakov, M.Yu, Baru, S.E., Basok, I.Yu, Bedny, I.V., Blinov, A.E., Blinov, V.E., Bobrov, A.V., Bobrovnikov, V.S., Bogomyagkov, A.V., Bondar, A.E., Buzykaev, A.R., Eidelman, S.I., Glukhovchenko, Yu.M., Gulevich, V.V., Gusev, D.V., Karnaev, S.E., Karpov, G.V., Karpov, S.V., Kharlamova, T.A., Kiselev, V.A., Kononov, S.A., Kotov, K.Yu, Kravchenko, E.A., Kulikov, V.F., Kurkin, G.Ya, Kuper, E.A., Levichev, E.B., Maksimov, D.A., Malyshev, V.M., Maslennikov, A.L., Medvedko, A.S., Meshkov, O.I., Mishnev, S.I., Morozov, I.I., Muchnoi, N.Yu, Neufeld, V.V., Nikitin, S.A., Nikolaev, I.B., Okunev, I.N., Onuchin, A.P., Oreshkin, S.B., Orlov, I.O., Osipov, A.A., Peleganchuk, S.V., Pivovarov, S.G., Piminov, P.A., Petrov, V.V., Poluektov, A.O., Pospelov, G.E., Prisekin, V.G., Rezanova, O.L., Ruban, A.A., Sandyrev, V.K., Savinov, G.A., Shamov, A.G., Shatilov, D.N., Shwartz, B.A., Simonov, E.A., Sinyatkin, S.V., Skrinsky, A.N., Smaluk, V.V., Sokolov, A.V., Sukharev, A.M., Starostina, E.V., Talyshev, A.A., Tayursky, V.A., Telnov, V.I., Tikhonov, Yu.A., Todyshev, K.Yu, Tumaikin, G.M., Usov, Yu.V., Vorobiov, A.I., Yushkov, A.N., Zhilich, V.N., Zhulanov, V.V., Zhuravlev, A.N.
Format: Artikel
Sprache:eng
Schlagworte:
Charmonium
Radiative decays
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Zusammenfassung:Using the inclusive photon spectrum based on a data sample collected at the J/ψ peak with the KEDR detector at the VEPP-4M e+e− collider, we measured the rate of the radiative decay J/ψ→γηc as well as ηc mass and width. Taking into account an asymmetric photon lineshape we obtained Γγηc0=2.98±0.18−0.33+0.15keV, Mηc=2983.5±1.4−3.6+1.6MeV/c2, Γηc=27.2±3.1−2.6+5.4MeV.
ISSN:0370-2693
1873-2445
DOI:10.1016/j.physletb.2014.09.064