Two-photon widths of the $\chi_{c0,2}$ states and helicity analysis for $\chi_{c2}\rightarrow\gamma\gamma$

dc.contributor.authorAblikim, M.en
dc.contributor.authorAchasov, M.N.en
dc.contributor.authorAmbrose, D.J.en
dc.contributor.authorAn, F.F.en
dc.contributor.authorAn, Q.en
dc.contributor.authorAn, Z.H.en
dc.contributor.authorBai, J.Z.en
dc.contributor.authorBan, Y.en
dc.contributor.authorBecker, J.en
dc.contributor.authorBerger, N.en
dc.contributor.authorBertani, M.en
dc.contributor.authorBian, J.M.en
dc.contributor.authorBoger, E.en
dc.contributor.authorBondarenko, O.en
dc.contributor.authorBoyko, I.en
dc.contributor.authorBriere, R.A.en
dc.contributor.authorBytev, V.en
dc.contributor.authorCai, X.en
dc.contributor.authorCalcaterra, A.en
dc.contributor.authorCao, G.F.en
dc.contributor.authorChang, J.F.en
dc.contributor.authorChelkov, G.en
dc.contributor.authorChen, G.en
dc.contributor.authorChen, H.S.en
dc.contributor.authorChen, J.C.en
dc.contributor.authorChen, M.L.en
dc.contributor.authorChen, S.J.en
dc.contributor.authorChen, Y.en
dc.contributor.authorChen, Y.B.en
dc.contributor.authorCheng, H.P.en
dc.contributor.authorChu, Y.P.en
dc.contributor.authorCronin-Hennessy, D.en
dc.contributor.authorDai, H.L.en
dc.contributor.authorDai, J.P.en
dc.contributor.authorDedovich, D.en
dc.contributor.authorDeng, Z.Y.en
dc.contributor.authorDenig, A.en
dc.contributor.authorDenysenko, I.en
dc.contributor.authorDestefanis, M.en
dc.contributor.authorDing, W.M.en
dc.contributor.authorDing, Y.en
dc.contributor.authorDong, L.Y.en
dc.contributor.authorDong, M.Y.en
dc.contributor.authorDu, S.X.en
dc.contributor.authorFang, J.en
dc.contributor.authorFang, S.S.en
dc.contributor.authorFava, L.en
dc.contributor.authorFeldbauer, F.en
dc.contributor.authorFeng, C.Q.en
dc.contributor.authorFerroli, R.B.en
dc.contributor.authorFu, C.D.en
dc.contributor.authorFu, J.L.en
dc.contributor.authorGao, Y.en
dc.contributor.authorGeng, C.en
dc.contributor.authorGoetzen, K.en
dc.contributor.authorGong, W.X.en
dc.contributor.authorGradl, W.en
dc.contributor.authorGreco, M.en
dc.contributor.authorGu, M.H.en
dc.contributor.authorGu, Y.T.en
dc.contributor.authorGuan, Y.H.en
dc.contributor.authorGuo, A.Q.en
dc.contributor.authorGuo, L.B.en
dc.contributor.authorGuo, Y.P.en
dc.contributor.authorHan, Y.L.en
dc.contributor.authorHao, X.Q.en
dc.contributor.authorHarris, F.A.en
dc.contributor.authorHe, K.L.en
dc.contributor.authorHe, M.en
dc.contributor.authorHe, Z.Y.en
dc.contributor.authorHeld, T.en
dc.contributor.authorHeng, Y.K.en
dc.contributor.authorHou, Z.L.en
dc.contributor.authorHu, H.M.en
dc.contributor.authorHu, J.F.en
dc.contributor.authorHu, T.en
dc.contributor.authorHuang, B.en
dc.contributor.authorHuang, G.M.en
dc.contributor.authorHuang, J.S.en
dc.contributor.authorHuang, X.Ten
dc.contributor.authorHuang, Y.P.en
dc.contributor.authorHussain, T.en
dc.contributor.authorJi, C.S.en
dc.contributor.authorJi, Q.en
dc.contributor.authorJi, X.B.en
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dc.contributor.authorJia, L.K.en
dc.contributor.authorJiang, L.L.en
dc.contributor.authorJiang, X.S.en
dc.contributor.authorJiao, J.B.en
dc.contributor.authorJiao, Z.en
dc.contributor.authorJin, D.P.en
dc.contributor.authorJin, S.en
dc.contributor.authorJing, F.F.en
dc.contributor.authorKalantar-Nayestanaki, N.en
dc.contributor.authorKavatsyuk, M.en
dc.contributor.authorKuehn, W.en
dc.contributor.authorLai, W.en
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dc.contributor.authorLi, W.D.en
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dc.contributor.authorLi, X.N.en
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dc.contributor.authorLiu, B.J.en
dc.contributor.authorLiu, B.J.en
dc.contributor.authorLiu, C.L.en
dc.contributor.authorLiu, C.X.en
dc.contributor.authorLiu, C.Y.en
dc.contributor.authorLiu, F.H.en
dc.contributor.authorLiu, F.en
dc.contributor.authorLiu, F.en
dc.contributor.authorLiu, H.en
dc.contributor.authorLiu, H.B.en
dc.contributor.authorLiu, H.H.en
dc.contributor.authorLiu, H.M.en
dc.contributor.authorLiu, H.W.en
dc.contributor.authorLiu, J.P.en
dc.contributor.authorLiu, K.Y.en
dc.contributor.authorLiu, K.en
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dc.contributor.authorLiu, P.L.en
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dc.contributor.authorLiu, Y.en
dc.contributor.authorLiu, Y.B.en
dc.contributor.authorLiu, Z.A.en
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dc.contributor.authorLu, Q.W.en
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dc.contributor.authorLuo, M.X.en
dc.contributor.authorLuo, T.en
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dc.contributor.authorLv, M.en
dc.contributor.authorMa, C.L.en
dc.contributor.authorMa, F.C.en
dc.contributor.authorMa, H.L.en
dc.contributor.authorMa, Q.M.en
dc.contributor.authorMa, S.en
dc.contributor.authorMa, T.en
dc.contributor.authorMa, X.Y.en
dc.contributor.authorMa, Y.en
dc.contributor.authorMaas, F.E.en
dc.contributor.authorMaggiora, M.en
dc.contributor.authorMalik, Q.A.en
dc.contributor.authorMao, H.en
dc.contributor.authorMao, Y.J.en
dc.contributor.authorMao, Z.P.en
dc.contributor.authorMesschendorp, J.G.en
dc.contributor.authorMin, J.en
dc.contributor.authorMin, T.J.en
dc.contributor.authorMitchell, R.E.en
dc.contributor.authorMo, X.H.en
dc.contributor.authorMorales, C.M.en
dc.contributor.authorMotzko, C.en
dc.contributor.authorMuchnoi, N. Yu.en
dc.contributor.authorNefedov, Y.en
dc.contributor.authorNicholson, C.en
dc.contributor.authorNikolaev, I.B.en
dc.contributor.authorNing, Z.en
dc.contributor.authorOlsen, S.L.en
dc.contributor.authorOuyang, Q.en
dc.contributor.authorPacetti, S.en
dc.contributor.authorPark, J.W.en
dc.contributor.authorPelizaeus, M.en
dc.contributor.authorPeters, K.en
dc.contributor.authorPing, J.L.en
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dc.contributor.authorPoling, R.en
dc.contributor.authorPrencipe, E.en
dc.contributor.authorPun, C.S.J.en
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dc.contributor.authorQian, S.en
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dc.contributor.authorZhao, G.en
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dc.contributor.authorZhao, J.W.en
dc.contributor.authorZhao, K.X.en
dc.contributor.authorZhao, L.en
dc.contributor.authorZhao, L.en
dc.contributor.authorZhao, M.G.en
dc.contributor.authorZhao, Q.en
dc.contributor.authorZhao, S.J.en
dc.contributor.authorZhao, T.C.en
dc.contributor.authorZhao, X.H.en
dc.contributor.authorZhao, Y.B.en
dc.contributor.authorZhao, Z.G.en
dc.contributor.authorZhemchugov, A.en
dc.contributor.authorZheng, B.en
dc.contributor.authorZheng, J.P.en
dc.contributor.authorZheng, Y.H.en
dc.contributor.authorZheng, Z.P.en
dc.contributor.authorZhong, B.en
dc.contributor.authorZhong, J.en
dc.contributor.authorZhou, L.en
dc.contributor.authorZhou, X.K.en
dc.contributor.authorZhou, X.R.en
dc.contributor.authorZhu, C.en
dc.contributor.authorZhu, K.en
dc.contributor.authorZhu, K.J.en
dc.contributor.authorZhu, S.H.en
dc.contributor.authorZhu, X.L.en
dc.contributor.authorZhu, X.W.en
dc.contributor.authorZhu, Y.M.en
dc.contributor.authorZhu, Y.S.en
dc.contributor.authorZhu, Z.A.en
dc.contributor.authorZhuang, J.en
dc.contributor.authorZou, B.S.en
dc.contributor.authorZou, J.H.en
dc.contributor.authorZuo, J.X.en
dc.date.accessioned2014-09-30T12:58:33Zen
dc.date.available2014-09-30T12:58:33Zen
dc.date.issued2012en
dc.description.abstractBased on a data sample of $106×10^6$ $\psi '$ events collected with the BESIII detector, the decays $\psi '\rightarrow\gamma\chi_{c0,2}, \chi_{c0,2}\rightarrow\gamma\gamma$ are studied to determine the two-photon widths of the $\chi_{c0,2}$ states. The two-photon decay branching fractions are determined to be $\mathscr{B}(\chi_{c0,2}\rightarrow\gamma\gamma)=(2.24±0.19±0.12±0.08)×10^{-4}$ and $\mathscr{B}(\chi_{c0,2}\rightarrow\gamma\gamma)=(3.21±0.18±0.17±0.13)×10^{-4}$. From these, the two-photon widths are determined to be $\Gamma_{\gamma\gamma}(\chi_{c0})=(2.33±0.20±0.13±0.17)$ $\text{keV}$, $\Gamma_{\gamma\gamma}(\chi_{c2})=(0.63±0.04±0.04±0.04)$ $\text{keV}$, and $\mathscr{R}=\Gamma_{\gamma\gamma}(\chi_{c2})/\Gamma_{\gamma\gamma}(\chi_{c0})=0.271±0.029±0.013±0.027$, where the uncertainties are statistical, systematic, and those from the PDG $\mathscr{B}(\psi '\rightarrow\gamma\chi_{c0,2}$ and $\Gamma(\chi_{c0,2})$ errors, respectively. The ratio of the two-photon widths for helicity $\lambda=0$ and helicity $\lambda=2$ components in the decay $\chi_{c2}\rightarrow\gamma\gamma$ is measured for the first time to be $f_{0/2}=\Gamma^{\lambda=0}_{\gamma\gamma}(\chi_{c2})/\Gamma^{\lambda=2}_{\gamma\gamma}(\chi_{c2})=0.00±0.02±0.02$.en
dc.identifier.citationAblikim, M., Achasov, M. N., Ambrose, D. J., An, F. F., An, Q., An, Z. H., . . . Zuo, J. X. (2012). Two-photon widths of the $\chi_{c0,2}$ states and helicity analysis for $\chi_{c2}\rightarrow\gamma\gamma$. Physical Review D - Particles, Fields, Gravitation and Cosmology, 85(11), 112008. http://dx.doi.org/10.1103/PhysRevD.85.112008en
dc.identifier.urihttps://hdl.handle.net/2022/18974
dc.language.isoen_USen
dc.publisherAmerican Physical Societyen
dc.relation.isversionofhttps://doi.org/10.1103/PhysRevD.85.112008en
dc.rights© 2012 American Physical Society.en
dc.titleTwo-photon widths of the $\chi_{c0,2}$ states and helicity analysis for $\chi_{c2}\rightarrow\gamma\gamma$en
dc.typeArticleen
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