Results of a search for the hc(1P1) state of charmonium in the \u3b7c\u3b3 and J/\u3c8\u3c00 decay modes
- Andreotti, M.
- Bagnasco, S.
- Baldini, W.
- Bettoni, D.
- Borreani, G.
- Buzzo, A.
- Calabrese, R.
- Cester, R.
- Cibinetto, G.
- Dalpiaz, P.
- Garzoglio, G
- Gollwitzer, K.E.
- Graham, M.
- Hu, M.
- Joffe, D.
- Kasper, J.
- Lasio, G.
- Lo Vetere, M.
- Luppi, E.
- Macr\uec, M.
- Mandelkern, M.
- Marchetto, F.
- Marinelli, M.
- Menichetti, E.
- Metreveli, Z.
- Mussa, R.
- Negrini, M.
- Obertino, M.M.
- Pallavicini, M.
- Pastrone, N.
- Patrignani, C.
- Pedlar, T.K.
- Pordes, S.
- Robutti, E.
- Roethel, W.
- Rosen, J.L.
- Rumerio, P.
- Rusack, R.
- Santroni, A.
- Schultz, J.
- Seo, S.H.
- Seth, K.K.
- Stancari, G.
- Stancari, M.
- Tomaradze, A.
- Uman, I.
- Vidnovic, T.
- Werkema, S.
- Zweber, P.
DOIAbstract
We report evidence for the hc state of charmonium in its \u3b7c\u3b3 decay mode and lack of evidence in the J/\u3c8\u3c00 mode. We studied these channels in p\u304p annihilations near the center of gravity of the PJ3 states, where the hc was reported in the J/\u3c8\u3c00 mode by E760, our previous experiment, at 3526.2\ub10.15\ub10.2MeV, with \u393R 641MeV. We observe an event excess in the \u3b7c\u3b3 mode near 3526 MeV. Testing the null hypothesis of a linearly varying background cross section against the alternate hypothesis that includes a resonance near 3526 MeV, we reject the null hypothesis with P 3c0.001. The resonance mass is 3525.8\ub10.2\ub10. 2MeV and the resonance width 641MeV. We estimate 10.0\ub13. 5<\u393p\u304pB\u3b7c\u3b3...
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