We measured, with the KLOE detector, the spectrum of π+π−invariant mass in a sample of 6.7 × 105 e+e− →π+π−γevents with thephoton at large polar angle (θγ > 45◦) at a centre of mass energy√s around the φ mass. We observe in this spectrum a clear contribution fromthe intermediate process φ→ f0(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 KK¯ . © 2006 Elsevier B.V. All rights reserved.
Study of the decay phi --->f0(980) gamma ---> pi+ pi- gamma with the KLOE detector / Ambrosino, Fabio; Napolitano, Marco; Chiefari, Giovanni; Saracino, Giulio; Massarotti, Paolo. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 634:2-3(2006), pp. 148-154. [10.1016/j.physletb.2006.01.016]
Study of the decay phi --->f0(980) gamma ---> pi+ pi- gamma with the KLOE detector.
AMBROSINO, FABIO;NAPOLITANO, MARCO;CHIEFARI, GIOVANNI;SARACINO, GIULIO;MASSAROTTI, PAOLO
2006
Abstract
We measured, with the KLOE detector, the spectrum of π+π−invariant mass in a sample of 6.7 × 105 e+e− →π+π−γevents with thephoton at large polar angle (θγ > 45◦) at a centre of mass energy√s around the φ mass. We observe in this spectrum a clear contribution fromthe intermediate process φ→ f0(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 KK¯ . © 2006 Elsevier B.V. All rights reserved.| File | Dimensione | Formato | |
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