We present a measurement of the ratio R=Gamma(K(e3 gamma)(0);E*(gamma) > 30 MeV, theta*(gamma)> 20 degrees)/Gamma(K(e3)(0)) and a first measurement of the direct emission contribution in semileptonic K(L) decays. The measurement was performed at the DA NE phi factory by selecting phi -> K(L)K(S) decays with the KLOE detector. We use 328 pb(-1) of data, corresponding to about 3.5 million K(e3)(0) events and about 9000 K(e3 gamma)(0) radiative events. Our result is R=(924 +/- 23(stat) +/- 16(syst))x10(-5) for the branching ratio and < X > = -2.3 +/- 1.3(stat) +/- 1.4(syst) for the effective strength parameter describing direct emission.

Ambrosino, F., Antonelli, A., Antonelli, M., Archilli, F., Bacci, C., Beltrame, P., et al. (2008). A study of the radiative K(L) -> pi(+/-)e(-/+)nu gamma decay and search for direct photon emission with the KLOE detector. THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS, 55(4), 539-546 [10.1140/epjc/s10052-008-0634-2].

A study of the radiative K(L) -> pi(+/-)e(-/+)nu gamma decay and search for direct photon emission with the KLOE detector

CERADINI, Filippo;DI MICCO, Biagio;
2008-01-01

Abstract

We present a measurement of the ratio R=Gamma(K(e3 gamma)(0);E*(gamma) > 30 MeV, theta*(gamma)> 20 degrees)/Gamma(K(e3)(0)) and a first measurement of the direct emission contribution in semileptonic K(L) decays. The measurement was performed at the DA NE phi factory by selecting phi -> K(L)K(S) decays with the KLOE detector. We use 328 pb(-1) of data, corresponding to about 3.5 million K(e3)(0) events and about 9000 K(e3 gamma)(0) radiative events. Our result is R=(924 +/- 23(stat) +/- 16(syst))x10(-5) for the branching ratio and < X > = -2.3 +/- 1.3(stat) +/- 1.4(syst) for the effective strength parameter describing direct emission.
Ambrosino, F., Antonelli, A., Antonelli, M., Archilli, F., Bacci, C., Beltrame, P., et al. (2008). A study of the radiative K(L) -> pi(+/-)e(-/+)nu gamma decay and search for direct photon emission with the KLOE detector. THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS, 55(4), 539-546 [10.1140/epjc/s10052-008-0634-2].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11590/114155
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