The ratio R-eta = Gamma(eta -> pi(+)pi(-)gamma)/Gamma(eta -> pi(+)pi(-)pi(0)) has been measured by analysing 22 million phi -> eta gamma decays collected by the KLOE experiment at DANE, corresponding to an integrated luminosity of 558 pb(-1). The eta -> pi(+)pi(-)gamma proceeds both via the rho resonant contribution, and possibly a non-resonant direct term, connected to the box anomaly. Our result, R-eta = 0.1856 +/- 0.0005(stat)+/- 0.0028(syst), points out a sizable contribution of the direct term to the total width. The di-pion invariant mass for the eta -> pi(+)pi(-)gamma decay could be described in a model-independent approach in terms of a(-) single free parameter, alpha. The determined value of the parameter alpha is alpha = (1.32 +/- 0.08(stat-0.09syst)(+0.10) +/- 0.02(theo)) GeV-2. 2012 Elsevier B.V. All rights reserved.

Measurement of Gamma(eta -> pi(+)pi(-)gamma)/Gamma(eta -> pi(+)pi(-)pi(0)) with the KLOE detector / D., B., D., B., I., B.P., G., B., Bini, C., C., B., V., B., F., B., R., B., P., B., A., B., L., C.B., L. C., B., G., C., F., C., P., C., E., C., E., D., E., D.L., G., D.R., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 718:3(2013), pp. 910-914. [10.1016/j.physletb.2012.11.032]

Measurement of Gamma(eta -> pi(+)pi(-)gamma)/Gamma(eta -> pi(+)pi(-)pi(0)) with the KLOE detector

BINI, Cesare;DE SANTIS, ANTONIO;DI DOMENICO, Antonio;FIORE, SALVATORE;FRANZINI, Paolo;GAUZZI, Paolo;PATERA, Vincenzo;
2013

Abstract

The ratio R-eta = Gamma(eta -> pi(+)pi(-)gamma)/Gamma(eta -> pi(+)pi(-)pi(0)) has been measured by analysing 22 million phi -> eta gamma decays collected by the KLOE experiment at DANE, corresponding to an integrated luminosity of 558 pb(-1). The eta -> pi(+)pi(-)gamma proceeds both via the rho resonant contribution, and possibly a non-resonant direct term, connected to the box anomaly. Our result, R-eta = 0.1856 +/- 0.0005(stat)+/- 0.0028(syst), points out a sizable contribution of the direct term to the total width. The di-pion invariant mass for the eta -> pi(+)pi(-)gamma decay could be described in a model-independent approach in terms of a(-) single free parameter, alpha. The determined value of the parameter alpha is alpha = (1.32 +/- 0.08(stat-0.09syst)(+0.10) +/- 0.02(theo)) GeV-2. 2012 Elsevier B.V. All rights reserved.
2013
chiral perturbation theory; e(+)e(-) collisions; e+e- collisions; eta decays; light mesons; η decays
01 Pubblicazione su rivista::01a Articolo in rivista
Measurement of Gamma(eta -> pi(+)pi(-)gamma)/Gamma(eta -> pi(+)pi(-)pi(0)) with the KLOE detector / D., B., D., B., I., B.P., G., B., Bini, C., C., B., V., B., F., B., R., B., P., B., A., B., L., C.B., L. C., B., G., C., F., C., P., C., E., C., E., D., E., D.L., G., D.R., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 718:3(2013), pp. 910-914. [10.1016/j.physletb.2012.11.032]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/503322
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