Study of the decay ϕ→f0(980)γ→π+π−γ with the KLOE detector

Autor: Juliet Lee-Franzini, P. Beltrame, Andrea Ferrari, Paolo Valente, S. Fiore, E. Graziani, Francesco Lacava, Vincenzo Patera, W. Kluge, A. Sciubba, S. Giovannella, M. Testa, A. Denig, Margherita Primavera, E. De Lucia, T. Spadaro, Alessandra Doria, T. Capussela, F. Perfetto, B. Valeriani, S. Chi, G. Capon, Paolo Santangelo, Pierluigi Campana, F. Murtas, M. Incagli, F. Nguyen, P. Gauzzi, R. Versaci, D. Leone, Ludovico Pontecorvo, G. Lanfranchi, Fabrizio Scuri, B. Di Micco, Stefan E. Müller, Enrico Pasqualucci, P. Branchini, M. Dreucci, V. V. Kulikov, A. Antonelli, P. De Simone, V. Bocci, E. Santovetti, M. Palutan, G. De Zorzi, C. Forti, Luca Tortora, F. Ambrosino, D. Bowring, M. Napolitano, Filippo Ceradini, S. Conetti, G. Felici, S. Dell'Agnello, Paolo Ciambrone, M. Moulson, G. Saracino, A. De Santis, G. Chiefari, C. Di Donato, Edoardo Gorini, Igor Sfiligoi, G. Finocchiaro, S. Ventura, P. Franzini, Stefano Veneziano, G. Bencivenni, A. Passeri, C. Bacci, Cesare Bini, R. Caloi, G. Venanzoni, M. L. Ferrer, F. Bossi, S. Miscetti, W. Mei, S. Meola, G. F. Xu, P. Massarotti, Barbara Sciascia, Andrea Ventura, M. Martini, Claudio Gatti, C. Bloise, Massimo Antonelli, S. Di Falco, A. Di Domenico, S. Bertolucci
Rok vydání: 2006
Předmět:
Zdroj: Physics Letters B. 634:148-154
ISSN: 0370-2693
DOI: 10.1016/j.physletb.2006.01.016
Popis: We measured, with the KLOE detector, the spectrum of π + π − invariant mass in a sample of 6.7 × 10 5 e + e − → π + π − γ events with the photon at large polar angle ( θ γ > 45 ° ) at a centre of mass energy s around the ϕ mass. We observe in this spectrum a clear contribution from the intermediate process ϕ → f 0 ( 980 ) γ . A sizeable effect is also observed in the distribution of the pion forward–backward asymmetry. We use different theoretical models to fit the spectrum and we determine the f0 mass and coupling constants to the ϕ, to π + π − and to K K ¯ .
Databáze: OpenAIRE
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