| Autor: |
M. M. Obertino, G. Zioulas, M. Macri, K. K. Seth, J. Streets, D. Bettoni, G. Garzoglio, P. Maas, Nadia Pastrone, M. Lo Vetere, F. Marchetto, S. Pordes, E. Menichetti, D. Joffe, K. Gollwitzer, J. Schultz, J. L. Rosen, T. K. Pedlar, W. Marsh, John Peoples, G. Cibinetto, R. Calabrese, T. Vidnovic, A. Santroni, M. Savrie, P.F. Dalpiaz, M. Mandelkern, Marco Pallavicini, P. Rumerio, Wander Baldini, Marco Martini, M. Negrini, S. H. Seo, I. Uman, S. Bagnasco, S. Jin, R. Mussa, S. J. Werkema, E. Robutti, Eleonora Luppi, Stefano Argiro, A. Buzzo, Matt W. Graham, Z. Metreveli, G. Lasio, J. Kasper, Giulio Stancari, Amiran Tomaradze, X. Fan, R. Cester, Roger Rusack, A. Hahn, M. Marinelli, W. Roethel, M. Ambrogiani, M. Stancari, C. Patrignani, Giorgio Borreani, M. Andreotti |
| Jazyk: |
angličtina |
| Rok vydání: |
2003 |
| Předmět: |
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| Popis: |
The resonance parameters of the charmonium ground state, η c (1 1 S 0 ) , have been measured by means of the reaction p p→η c →γγ . The mass and total width are determined to be 2984.1±2.1±1.0 MeV/ c 2 and 20.4 +7.7 −6.7 ±2.0 MeV, respectively. The product of branching ratios B( p p→η c )B(η c →γγ) is determined to be 22.4 +3.8 −3.7 ±2.0 ×10 −8 , from which B(η c →γγ)= 1.87 +0.32+0.95 −0.31−0.50 ×10 −4 , and Γ ( η c → γγ )=3.8 +1.1+1.9 −1.0−1.0 keV are derived using B(η c → p p)=(12±4)×10 −4 from the literature. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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