Data di Pubblicazione:
2003
Abstract:
The resonance parameters of the charmonium ground state, eta(c)(1(l)S(0)), have been measured by means of the reaction (p) over barp --> eta(c) --> gammagamma. The mass and total width are determined to be 2984.1 +/- 2.1 +/- 1.0 MeV/c(2) and 20.4(-6.7)(+7.7) +/- 2.0 Mev, respectively. The product of branching ratios B((p) over barp --> eta(c))B(eta(c) --> gammagamma) is determined to be (22.4(-3.7)(+3.8) +/- 2.0) x 10(-8), from which B(eta(c) --> gammagamma) = (1.87(-0.31-0.50)(+0.32+0.95)) x 10(-4), and Gamma(eta(c) --> gammagamma) = 3.8(-1.0-1.0)(+1.1+1-9) keV are derived using B(eta(c) --> (p) over barp) (12 +/- 4) x 10(-4) from the literature. (C) 2003 Published by Elsevier B.V.
Tipologia CRIS:
03A-Articolo su Rivista
Elenco autori:
M. Ambrogiani;A. Andreotti;S. Argiro;S. Bagnasco;W. Baldini;D. Bettoni;G. Borreani;A. Buzzo;R. Calabrese;R. Cester;G. Cibinetto;P. Dalpiaz;X. Fan;G. Garzoglio;K. E. Gollwitzer;M. Graham;A. Hahn;S. Jin;D. Joffe;J. Kasper;G. Lasio;M. L. Vetere;E. Luppi;P. Maas;M. Macri;M. Mandelkern;F. Marchetto;M. Marinelli;W. Marsh;M. Martini;E. Menichetti;Z. Metreveli;R. Mussa;M. Negrini;M. M. Obertino;M. Pallavicini;N. Pastrone;C. Patrignani;T. K. Pedlar;J. Peoples;S. Pordes;E. Robutti;W. Roethel;J. Rosen;P. Rumerio;R. Rusack;A. Santroni;M. Savrie;J. Schultz;S. H. Seo;K. K. Seth;G. Stancari;M. Stancari;J. Streets;A. Tomaradze;I. Uman;T. Vidnovic;S. Werkema;G. Zioulas
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