Measurement of the two photon decay of the χc0(1 3P0) state of charmonium

M. Andreotti, S. Bagnasco, W. Baldini, D. Bettoni, G. Borreani, A. Buzzo, R. Calabrese, R. Cester, G. Cibinetto, P. Dalpiaz, G. Garzoglio, K. E. Gollwitzer, M. Graham, M. Hu, D. Joffe, J. Kasper, G. Lasio, M. Lo Vetere, E. Luppi, M. MacrìM. Mandelkern, F. Marchetto, M. Marinelli, E. Menichetti, Z. Metreveli, R. Mussa, M. Negrini, M. M. Obertino, M. Pallavicini, N. Pastrone, C. Patrignani, T. K. Pedlar, S. Pordes, E. Robutti, W. Roethel, J. L. Rosen, P. Rumerio, R. Rusack, A. Santroni, J. Schultz, S. H. Seo, K. K. Seth, G. Stancari, M. Stancari, A. Tomaradze, I. Uman, T. Vidnovic, S. Werkema, P. Zweber

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7 Scopus citations


We report on the decay to two photons of the χc0(1 3P0) charmonium resonance formed in p̄p interactions at Fermilab experiment E835. We have measured the product of branching ratios BR(χc0→p̄p) x BR(χc0 →γγ)=(6.52±1.18(stat)-0.72 +0.48(sys))×10-8. Using values from the 2002 PDG, this measurement leads to the partial width Γ(χc0 →γγ)=2.9±0.9 keV.

Original languageEnglish (US)
Pages (from-to)16-21
Number of pages6
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number1-2
StatePublished - Mar 25 2004

Bibliographical note

Funding Information:
We are grateful for the technical support provided by Fermilab, in particular the Beams Division's Antiproton Source Department, and by the staffs of our institutions. This research is supported by the US Department of Energy and the Italian Istituto Nazionale di Fisica Nucleare.


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