Study of the decay phi -> f(0)(980)gamma -> pi (+) pi(-) gamma with the KLOE detector
- F. AMBROSINO
- A. ANTONELLI
- M. ANTONELLI
- C. BACCI
- P. BELTRAME
- G. BENCIVENNI
- S. BERTOLUCCI
- C. BINI
- C. BLOISE
- V. BOCCI
- F. BOSSI
- D. BOWRING
- P. BRANCHINI
- R. CALOI
- P. CAMPANA
- G. CAPON
- T. CAPUSSELA
- F. CERADINI
- S. CHI
- G. CHIEFARI
- P. CIAMBRONE
- S. CONETTI
- E. DE LUCIA
- P. DE SIMONE
- G. DE ZORZI
- S. DELL'AGNELLO
- A. DENIG
- A. DI DOMENICO
- C. DI DONATO
- S. DI FALCO
- B. DI MICCO
- A. DORIA
- M. DREUCCI
- G. FELICI
- A. FERRARI
- M. L. FERRER
- G. FINOCCHIARO
- S. FIORE
- C. FORTI
- P. FRANZINI
- C. GATTI
- P. GAUZZI
- S. GIOVANNELLA
- E. GRAZIANI
- M. INCAGLI
- W. KLUGE
- V. KULIKOV
- F. LACAVA
- G. LANFRANCHI
- J. LEE FRANZINI
- D. LEONE
- M. MARTINI
- P. MASSAROTTI
- W. MEI
- S. MEOLA
- S. MISCETTI
- M. MOULSON
- S. MULLER
- F. MURTAS
- M. NAPOLITANO
- F. NGUYEN
- M. PALUTAN
- E. PASQUALUCCI
- A. PASSERI
- V. PATERA
- F. PERFETTO
- L. PONTECORVO
- P. SANTANGELO
- E. SANTOVETTI
- G. SARACINO
- B. SCIASCIA
- A. SCIUBBA
- F. SCURI
- I. SFILIGOI
- T. SPADARO
- M. TESTA
- L. TORTORA
- P. VALENTE
- B. VALERIANI
- G. VENANZONI
- S. VENEZIANO
- S. VENTURA
- R. VERSACI
- G. XU
- GORINI, Edoardo
- PRIMAVERA, Margherita
- VENTURA, Andrea
DOIAbstract
We measured, with the KLOE detector, the spectrum of pi(+)pi(-) invariant mass in a sample of 6.7 x 10(5) e(+)e(-) -> pi(+)pi(-)gamma events with the photon at large polar angle (theta(gamma) > 45 degrees) at a centre of mass energy root s around the phi mass. We observe in this spectrum a clear contribution from the intermediate process phi -> f(0)(980)gamma. 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 to mass and coupling constants to the phi, to pi(+)pi(-) and to KK