A consistent description of rho0 -> pi pi gamma decays including sigma(500) meson effects
Bramon Planas, Albert (Universitat Autònoma de Barcelona. Departament de Física)
Escribano, Rafel (Institut de Física d'Altes Energies)

Data:	2004
Resum:	A consistent description of σ(500) meson effects in ρ0→π0π0γ and π+π−γ decays is proposed in terms of reasonably simple amplitudes which reproduce the expected chiral-loop behaviour for large mσ values. For the neutral case, in addition to the well known ω exchange, there is an important contribution from the σ(500) meson that is in agreement with recent experimental data. For the charged case, where the dominant contribution comes from bremsstrahlung, the effects of the σ(500) meson are relevant only at high values of the photon energy and compatible with present data. A combined analysis of both processes with moderately improved experimental information should contribute decisively to clarify the status of this controversial σ(500) meson.
Ajuts:	Ministerio de Ciencia y Tecnología FPA2002-00748EU
Nota:	Altres ajuts: work partially suportted by EU, HPRN-CT-2002-00311, EURIDICE network
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Matèria:	Sig ; Pmo ; Chl
Publicat a:	Journal of high energy physics, Vol. 2004 (Feb. 2004), art. 048, ISSN 1029-8479

DOI: 10.1088/1126-6708/2004/02/048

Postprint 12 p, 296.8 KB

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