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We report evidence for the hc state of charmonium in its ηcγ decay mode and lack of evidence in the J/ψπ0 mode. We studied these channels in p̄p annihilations near the center of gravity of the PJ3 states, where the hc was reported in the J/ψπ0 mode by E760, our previous experiment, at 3526.2±0.15±0.2MeV, with ΓR≤1MeV. We observe an event excess in the ηcγ 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∼0.001. The resonance mass is 3525.8±0.2±0. 2MeV and the resonance width ≤1MeV. We estimate 10.0±3. 5<Γp̄pBηcγ<12.0±4.5eV, corresponding to fixed values 0.5<ΓR<1.0MeV. We find no event excess within the search region in the J/ψπ0 mode. © 2005 The American Physical Society.

Results of a search for the hc(1P1) state of charmonium in the ηcγ and J/ψπ0 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.; Macrì, 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.. - In: PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY. - ISSN 1550-7998. - STAMPA. - 72:3(2005), pp. 032001.1-032001.11. [10.1103/PhysRevD.72.032001]

Results of a search for the hc(1P1) state of charmonium in the ηcγ and J/ψπ0 decay modes

PATRIGNANI, CLAUDIA;
2005

Abstract

We report evidence for the hc state of charmonium in its ηcγ decay mode and lack of evidence in the J/ψπ0 mode. We studied these channels in p̄p annihilations near the center of gravity of the PJ3 states, where the hc was reported in the J/ψπ0 mode by E760, our previous experiment, at 3526.2±0.15±0.2MeV, with ΓR≤1MeV. We observe an event excess in the ηcγ 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∼0.001. The resonance mass is 3525.8±0.2±0. 2MeV and the resonance width ≤1MeV. We estimate 10.0±3. 5<Γp̄pBηcγ<12.0±4.5eV, corresponding to fixed values 0.5<ΓR<1.0MeV. We find no event excess within the search region in the J/ψπ0 mode. © 2005 The American Physical Society.
2005
Results of a search for the hc(1P1) state of charmonium in the ηcγ and J/ψπ0 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.; Macrì, 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.. - In: PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY. - ISSN 1550-7998. - STAMPA. - 72:3(2005), pp. 032001.1-032001.11. [10.1103/PhysRevD.72.032001]
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.; Macrì, 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.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/551921
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