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@ARTICLE{Guo:127617,
      author       = {Guo, Feng-Kun and Meißner, Ulf-G.},
      title        = {{E}xamining {C}oupled-{C}hannel {E}ffects in {R}adiative
                      {C}harmonium {T}ransitions},
      journal      = {Physical review letters},
      volume       = {108},
      number       = {11},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {FZJ-2012-00575},
      pages        = {-112002},
      year         = {2012},
      note         = {5 pages, 2 figures. Numerical results corrected. Accepted
                      for publication in Phys. Rev. Lett},
      abstract     = {Coupled-channel effects due to coupling of charmonia to the
                      charmed and anticharmed mesons are of current interest in
                      heavy quarkonium physics. However, the effects have not been
                      unambiguously established. In this paper, a clean method is
                      proposed in order to examine the coupled-channel effects in
                      charmonium transitions. We show that the hindered M1
                      radiative transitions from the 2P to 1P charmonia are
                      suitable for this purpose. We suggest to measure one or more
                      of the ratios $Gamma(h_c'-->chi_{cJ}$
                      $gamma)/Gamma(chi_{cJ}'-->chi_{cJ}$ $pi^0)$ and
                      $Gamma(chi_{cJ}'-->h_c$ $gamma)/Gamma(chi_{cJ}'-->chi_{cJ}$
                      $pi^0),$ for which highly nontrivial and parameter-free
                      predictions are given. The picture can also be tested using
                      both unquenched and quenched lattice calculations.},
      keywords     = {quarkonium: heavy (INSPIRE) / coupled channel (INSPIRE) /
                      charmonium (INSPIRE) / quenching (INSPIRE) / lattice
                      (INSPIRE)},
      cin          = {IAS-4 / IKP-3 / IKP-TH},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IAS-4-20090406 / I:(DE-Juel1)IKP-3-20111104 /
                      I:(DE-Juel1)VDB223},
      pnm          = {531 - Hadron Structure and Dynamics (HSD) (POF2-531)},
      pid          = {G:(DE-HGF)POF2-531},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000301411300008},
      eprint       = {1111.1151},
      howpublished = {arXiv:1111.1151},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:1111.1151;\%\%$},
      doi          = {10.1103/PhysRevLett.108.112002},
      url          = {https://juser.fz-juelich.de/record/127617},
}