Study of the η c (1 1 </mml:…
1995; American Physical Society; Volume: 52; Issue: 9 Linguagem: Inglês
10.1103/physrevd.52.4839
ISSN1538-4500
AutoresT. A. Armstrong, D. Bettoni, V. Bharadwaj, C. Biino, G. Blanford, G. Borreani, D. Broemmelsiek, A. Buzzo, R. Calabrese, A. Ceccucci, R. Cester, M. Church, P. Dalpiaz, P. Dalpiaz, D. Dimitroyannis, M. Fabbri, J. Fast, A. Gianoli, C. M. Ginsburg, K. Gollwitzer, G. Govi, A. Hahn, M. Hasan, S. Hsueh, R. Lewis, E. Luppi, M. Macrı́, A. M. Majewska, M. Mandelkern, F. Marchetto, M. Marinelli, J. Marques, W. Marsh, M. Martini, M. Masuzawa, E. Menichetti, A. Migliori, R. Mussa, S. Palestini, M. Pallavicini, S. Passaggio, N. Pastrone, C. Patrignani, J. Peoples, F. Petrucci, Maria Grazia Pia, S. Pordes, P. A. Rapidis, R. Ray, John D. Reid, G. Rinaudo, B. Roccuzzo, J. Rosen, A. Santroni, M. Sarmiento, M. Savrré, J. Schultz, K. K. Seth, A. Smith, G. A. Smith, M. Sozzi, S. Trokenheim, Martin Weber, S. Werkema, Y. Zhang, Jing Zhao, G. Zioulas,
Tópico(s)High-Energy Particle Collisions Research
ResumoThe E760 Collaboration performed an experiment in the Antiproton Accumulator at Fermilab to study the two photon decay of the ηc(1 1S0) charmonium state formed in p¯p annihilations. This resulted in a new measurement of the mass Mηc=2988.3+3.3−3.1 MeV/c2 and of the product B(ηc→p¯p)×Γ(ηc→γγ) =(8.1+2.9−2.0) eV. We performed a search for the process p¯p→η′c(2 1S0)→γγ over a limited range of center-of-mass energies. Since no signal was observed, we derived upper limits on the product of branching ratios B(η′c→p¯p)×B(η′c→γγ) in the center-of-mass energy range 3584≤ √s ≤3624 MeV. We observed no signal for the nonresonant process p¯+p→γ+γ and obtain upper limits.Received 20 April 1995DOI:https://doi.org/10.1103/PhysRevD.52.4839©1995 American Physical Society
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