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Two photon width of \(\eta_c\)

  • Theoretical Physics
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The European Physical Journal C - Particles and Fields Aims and scope Submit manuscript

Abstract.

We discuss the measured partial width of the pseudoscalar charmonium state \(\eta_c\) into two photons. Predictions from potential models are examined and compared with experimental values. On including radiative corrections, it is found that present measurements are compatible both with a QCD type potential and with a static Coulomb potential. The latter is then used to give an estimate on the \(\eta_b\) decay into two photons. Results for \(\etac\) are also compared with those from \(J/\psi\) data through the NRQCD model.

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Authors and Affiliations

  1. Perugia University and INFN, via Pascoli 06100, Perugia, Italy , , , , , , IT

    N. Fabiano

  2. INFN National Laboratories, P.O. Box 13, 00044, Frascati, Italy , , , , , , IT

    G. Pancheri

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  1. N. Fabiano
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  2. G. Pancheri
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Received: 25 October 2001 / Revised version: 7 March 2002 Published online: 30 August 2002

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Fabiano, N., Pancheri, G. Two photon width of \(\eta_c\) . Eur. Phys. J. C 25, 421–425 (2002). https://doi.org/10.1007/s10052-002-0974-2

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  • DOI: https://doi.org/10.1007/s10052-002-0974-2

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