J/ψ and ψ(2S) radiative transitions to ηc

Using 2.45×107 ψ(2S) decays collected with the CLEO-c detector at the Cornell Electron Storage Ring we present the most precise measurements of magnetic dipole transitions in the charmonium system. We measure B(ψ(2S)→γηc)=(4.32±0.16±0.60)×10-3, B(J/ψ→γηc)/B(ψ(2S)→γηc)=4.59±0. 23±0.64, and B(J/ψ→γηc)...

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Κύριοι συγγραφείς: Mitchell, R, Shepherd, MR, Besson, D, Pedlar, T, Cronin-Hennessy, D, Gao, K, Hietala, J, Kubota, Y, Klein, T, Lang, B, Poling, R, Scott, A, Zweber, P, Dobbs, S, Metreveli, Z, Seth, K, Tomaradze, A, Libby, J, Powell, A, Wilkinson, G, Ecklund, K, Love, W, Savinov, V, Lopez, A, Mendez, H
Μορφή: Journal article
Γλώσσα:English
Έκδοση: 2009
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author Mitchell, R
Shepherd, MR
Besson, D
Pedlar, T
Cronin-Hennessy, D
Gao, K
Hietala, J
Kubota, Y
Klein, T
Lang, B
Poling, R
Scott, A
Zweber, P
Dobbs, S
Metreveli, Z
Seth, K
Tomaradze, A
Libby, J
Powell, A
Wilkinson, G
Ecklund, K
Love, W
Savinov, V
Lopez, A
Mendez, H
author_facet Mitchell, R
Shepherd, MR
Besson, D
Pedlar, T
Cronin-Hennessy, D
Gao, K
Hietala, J
Kubota, Y
Klein, T
Lang, B
Poling, R
Scott, A
Zweber, P
Dobbs, S
Metreveli, Z
Seth, K
Tomaradze, A
Libby, J
Powell, A
Wilkinson, G
Ecklund, K
Love, W
Savinov, V
Lopez, A
Mendez, H
author_sort Mitchell, R
collection OXFORD
description Using 2.45×107 ψ(2S) decays collected with the CLEO-c detector at the Cornell Electron Storage Ring we present the most precise measurements of magnetic dipole transitions in the charmonium system. We measure B(ψ(2S)→γηc)=(4.32±0.16±0.60)×10-3, B(J/ψ→γηc)/B(ψ(2S)→γηc)=4.59±0. 23±0.64, and B(J/ψ→γηc)=(1.98±0.09±0.30) %. We observe a distortion in the ηc line shape due to the photon-energy dependence of the magnetic dipole transition rate. We find that measurements of the ηc mass are sensitive to the line shape, suggesting an explanation for the discrepancy between measurements of the ηc mass in radiative transitions and other production mechanisms. © 2009 The American Physical Society.
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spelling oxford-uuid:a09df767-23fe-41fb-bf7d-7a8b94925ae72022-03-27T02:06:51ZJ/ψ and ψ(2S) radiative transitions to ηcJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:a09df767-23fe-41fb-bf7d-7a8b94925ae7EnglishSymplectic Elements at Oxford2009Mitchell, RShepherd, MRBesson, DPedlar, TCronin-Hennessy, DGao, KHietala, JKubota, YKlein, TLang, BPoling, RScott, AZweber, PDobbs, SMetreveli, ZSeth, KTomaradze, ALibby, JPowell, AWilkinson, GEcklund, KLove, WSavinov, VLopez, AMendez, HUsing 2.45×107 ψ(2S) decays collected with the CLEO-c detector at the Cornell Electron Storage Ring we present the most precise measurements of magnetic dipole transitions in the charmonium system. We measure B(ψ(2S)→γηc)=(4.32±0.16±0.60)×10-3, B(J/ψ→γηc)/B(ψ(2S)→γηc)=4.59±0. 23±0.64, and B(J/ψ→γηc)=(1.98±0.09±0.30) %. We observe a distortion in the ηc line shape due to the photon-energy dependence of the magnetic dipole transition rate. We find that measurements of the ηc mass are sensitive to the line shape, suggesting an explanation for the discrepancy between measurements of the ηc mass in radiative transitions and other production mechanisms. © 2009 The American Physical Society.
spellingShingle Mitchell, R
Shepherd, MR
Besson, D
Pedlar, T
Cronin-Hennessy, D
Gao, K
Hietala, J
Kubota, Y
Klein, T
Lang, B
Poling, R
Scott, A
Zweber, P
Dobbs, S
Metreveli, Z
Seth, K
Tomaradze, A
Libby, J
Powell, A
Wilkinson, G
Ecklund, K
Love, W
Savinov, V
Lopez, A
Mendez, H
J/ψ and ψ(2S) radiative transitions to ηc
title J/ψ and ψ(2S) radiative transitions to ηc
title_full J/ψ and ψ(2S) radiative transitions to ηc
title_fullStr J/ψ and ψ(2S) radiative transitions to ηc
title_full_unstemmed J/ψ and ψ(2S) radiative transitions to ηc
title_short J/ψ and ψ(2S) radiative transitions to ηc
title_sort j ψ and ψ 2s radiative transitions to ηc
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