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Observation of the radiative decays of Υ(1S) to χc1.

MPS-Authors

Katrenko,  P.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Adachi,  I.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Aihara,  H.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Al Said,  S.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Asner,  D.M.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Aushev,  T.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Badhrees,  I.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Bahinipati,  S.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Behera,  P.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Beleno,  C.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Bennett,  J.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Bhardwaj,  V.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Bhuyan,  B.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Biswal,  J.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Bobrov,  A.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Bonvicini,  G.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Bracko,  M.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Campajola,  M.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Cao,  L.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Cervenkov,  D.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Chekelian,  V.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Chen,  A.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Cheon,  B.G.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Chilikin,  K.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Cho,  H.E.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Cho,  K.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Choi,  S.-K.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Choi,  Y.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Choudhury,  S.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Cinabro,  D.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Cunliffe,  S.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Di Capua,  F.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Di Carlo,  S.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Dolezal,  Z.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Dong,  T.V.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Eidelman,  S.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Epifanov,  D.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Fast,  J.E.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Fulsom,  B.G.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Garg,  R.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Gaur,  V.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Gabyshev,  N.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Garmash,  A.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Giri,  A.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Goldenzweig,  P.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Golob,  B.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Grzymkowska,  O.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Hartbrich,  O.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Hayasaka,  K.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Hayashii,  H.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Hou,  W.-S.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Iijima,  T.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Inami,  K.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Ishikawa,  A.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Itoh,  R.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Iwasaki,  M.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Iwasaki,  Y.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Jacobs,  W.W.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Jeon,  H.B.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Jia,  S.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Jin,  Y.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Joffe,  D.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Joo,  K.K.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Karyan,  G.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Kichimi,  H.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Kim,  D.Y.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Kim,  K.T.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Kim,  S.H.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Kinoshita,  K.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Kodys,  P.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Korpar,  S.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Kroeger,  R.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Kuhr,  T.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Lee,  I.S.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Lee,  S.C.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Lewis,  P.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Li,  Y.B.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Li Gioi,  L.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Libby,  J.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Lieret,  K.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

MacQueen,  C.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Masuda,  M.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Matsuda,  T.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Matvienko,  D.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Merola,  M.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Miyabayashi,  K.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Miyata,  H.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Mizuk,  R.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Mohanty,  G.B.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Moon,  T.J.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Mori,  T.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Mussa,  R.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Nakano,  E.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Nakano,  T.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Nakao,  M.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Nayak,  M.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Nisar,  N.K.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Nishida,  S.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Nishimura,  K.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Onuki,  H.Ono Y.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Oskin,  P.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Pakhlov,  P.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Pakhlova,  G.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Pang,  T.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Pardi,  S.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Park,  C.W.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Park,  H.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Park,  S.-H.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Paul,  S.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Pedlar,  T.K.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Pestotnik,  R.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Piilonen,  L.E.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Popov,  V.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Prencipe,  E.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Prim,  M.T.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Ritter,  M.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Rostomyan,  A.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Rout,  N.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Russo,  G.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Sahoo,  D.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Sakai,  Y.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Sandilya,  S.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Sanuki,  T.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Savinov,  V.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Schneider,  O.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Schnell,  G.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Schueler,  J.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Schwanda,  C.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Seino,  Y.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Senyo,  K.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Sevior,  M.E.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Shen,  C.P.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Shiu,  J.-G.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Solovieva,  E.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Staric,  M.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Stottler,  Z.S.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Sumiyoshi,  T.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Sutcliffe,  W.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Takizawa,  M.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Tamponi,  U.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Tanida,  K.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Tenchini,  F.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Trabelsi,  K.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Uchida,  M.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Uehara,  S.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Uglov,  T.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Unno,  Y.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Uno,  S.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Urquijo,  P.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Usov,  Y.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Van Tonder,  R.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Varner,  G.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Vossen,  A.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Wang,  B.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Wang,  C.H.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Wang,  M.-Z.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Wang,  P.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Wang,  X.L.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Won,  E.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Yang,  S.B.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Ye,  H.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Yelton,  J.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Yin,  J.H.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Yuan,  C.Z.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Yusa,  Y.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Zhang,  Z.P.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Zhilich,  V.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Zhukova,  V.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

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Citation

Katrenko, P., Adachi, I., Aihara, H., Al Said, S., Asner, D., Aushev, T., et al. (2020). Observation of the radiative decays of Υ(1S) to χc1. Physical Review Letters, 124, 122001. Retrieved from https://publications.mppmu.mpg.de/?action=search&mpi=MPP-2020-371.


Cite as: https://hdl.handle.net/21.11116/0000-0008-1AFD-F
Abstract
We report the first observation of the radiative decay of the $\Upsilon(1S)$ into a charmonium state. The statistical significance of the observed signal of $\Upsilon(1S) \to \gamma \chi_{c1}$ is 6.3 standard deviations including systematics. The branching fraction is calculated to be Br($\Upsilon(1S) \to \gamma \chi_{c1}$) = (4.7^{+2.4}_{-1.8} (stat) ^{+0.4}_{-0.5} (sys)) * 10^{-5}. We also searched for $\Upsilon(1S)$ radiative decays into $\chi_{c0,2}$ and $\eta_c(1S,2S)$ and set upper limits on their branching fractions. These results are obtained from a 24.9 fb^{-1} data sample collected with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider at a center-of-mass energy equal to the $\Upsilon(2S)$ mass using $\Upsilon(1S)$ tagging by the $\Upsilon(2S) \to \Upsilon(1S) \pi^+\pi^-$ transitions.