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@ARTICLE{Guo:18594,
      author       = {Guo, F.-K. and Hanhart, C. and Li, G. and U.-G. Meißner,
                      U.-G. and Zhao, Q.},
      title        = {{E}ffect of charmed meson loops on charmonium transitions},
      journal      = {Physical review / D},
      volume       = {83},
      number       = {3},
      issn         = {1550-7998},
      address      = {[S.l.]},
      publisher    = {Soc.},
      reportid     = {PreJuSER-18594},
      pages        = {034013},
      year         = {2011},
      note         = {We thank Yu Jia, Thomas Mannel, and Joan Soto for useful
                      discussions. F.-K.G., C. H., and U.-G. M. thank the
                      Helmholtz Association for funds provided to the virtual
                      institute "Spin and strong QCD'' (VH-VI-231) and by the DFG
                      (SFB/TR 16, "Subnuclear Structure of Matter'') and the
                      European Community-Research Infrastructure Integrating
                      Activity Study of Strongly Interacting Matter'' (acronym
                      HadronPhysics2, Grant Agreement No. 227431) under the
                      Seventh Framework Program of the EU. U.-G. M. also thanks
                      the BMBF for support (Grant No. 06BN9006). Q.Z. and G. L.
                      acknowledge the support, in part, from the National Natural
                      Science Foundation of China (Grants No. 10675131, No.
                      10491306, and No. 10947007), Chinese Academy of Sciences
                      (No. KJCX3-SYW-N2), and Ministry of Science and Technology
                      of China (No. 2009CB825200). G. L. thanks the partial
                      support from Shandong Province (Grant No. ZR2010AM011).},
      abstract     = {The effects of intermediate charmed mesons on charmonium
                      transitions with the emission of one pion or eta are studied
                      systematically. Based on a nonrelativistic effective field
                      theory we show that charmed meson loops are enhanced
                      compared to the corresponding tree-level contributions for
                      transitions between two S-wave charmonia as well as for
                      transitions between two P-wave charmonia. On the contrary,
                      for the transitions between one S-wave and one P-wave
                      charmonium state, the loops need to be analyzed case by case
                      and often appear to be suppressed. The relation to and
                      possible implications for an effective Lagrangian approach
                      are also discussed. This study at the same time provides a
                      cross-check for the numerical evaluations.},
      keywords     = {effective field theory: nonrelativistic (INSPIRE) / charmed
                      meson: intermediate state (INSPIRE) / charmonium: hadronic
                      decay (INSPIRE) / effective Lagrangian: chiral (INSPIRE) /
                      pi0: production (INSPIRE) / eta: production (INSPIRE) /
                      Feynman graph: higher-order (INSPIRE) / tree approximation
                      (INSPIRE) / ground state (INSPIRE) / excited state (INSPIRE)
                      / charmonium: width (INSPIRE) / amplitude analysis (INSPIRE)
                      / numerical calculations (INSPIRE) / bibliography (INSPIRE)},
      cin          = {IKP-3},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IKP-3-20111104},
      pnm          = {Physik der Hadronen und Kerne / EU: 227431},
      pid          = {G:(DE-Juel1)FUEK413 / G:(EU-Grant)227431},
      shelfmark    = {Astronomy $\&$ Astrophysics / Physics, Particles $\&$
                      Fields / 13.25.Gv / 12.39.Fe / 12.39.Hg / 14.40.Pq},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000287368200004},
      eprint       = {1008.3632},
      howpublished = {arXiv:1008.3632},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:1008.3632;\%\%$},
      doi          = {10.1103/PhysRevD.83.034013},
      url          = {https://juser.fz-juelich.de/record/18594},
}