We have studied the eta -> pi(+)pi(-)e(+)e(-)(gamma) decay using about 1.7 fb(-1) collected by the KLOE experiment at the DA Phi NE phi-factory. This corresponds to about 72 millions eta mesons produced in phi radiative decays. We have measured the branching ratio, inclusive of radiative effects, with 4% accuracy: BR(eta -> pi(+)pi(-)e(+)e(-)(gamma)) = (26.8 +/- 0.9(stat.)+/- 0.7(syst.)) x 10(-5). We have obtained the first measurement of the CP-odd pi pi-ee decay planes angular asymmetry, A(phi) = (-0.6 +/- 2.5(Stat.)+/- 1.8(Syst.)) x 10(-2). (C) 2009 Elsevier B.V. All rights reserved.

Ambrosino, F., Antonelli, A., Antonelli, M., Archilli, F., Beltrame, P., Bencivenni, G., et al. (2009). Measurement of the branching ratio and search for a CP-violating asymmetry in the eta -> pi(+)pi(-)e(+)e(-)(gamma) decay at KLOE. PHYSICS LETTERS. SECTION B, 675(3-4), 283-288 [10.1016/j.physletb.2009.04.013].

Measurement of the branching ratio and search for a CP-violating asymmetry in the eta -> pi(+)pi(-)e(+)e(-)(gamma) decay at KLOE

CERADINI, Filippo;DI MICCO, Biagio;
2009-01-01

Abstract

We have studied the eta -> pi(+)pi(-)e(+)e(-)(gamma) decay using about 1.7 fb(-1) collected by the KLOE experiment at the DA Phi NE phi-factory. This corresponds to about 72 millions eta mesons produced in phi radiative decays. We have measured the branching ratio, inclusive of radiative effects, with 4% accuracy: BR(eta -> pi(+)pi(-)e(+)e(-)(gamma)) = (26.8 +/- 0.9(stat.)+/- 0.7(syst.)) x 10(-5). We have obtained the first measurement of the CP-odd pi pi-ee decay planes angular asymmetry, A(phi) = (-0.6 +/- 2.5(Stat.)+/- 1.8(Syst.)) x 10(-2). (C) 2009 Elsevier B.V. All rights reserved.
2009
Ambrosino, F., Antonelli, A., Antonelli, M., Archilli, F., Beltrame, P., Bencivenni, G., et al. (2009). Measurement of the branching ratio and search for a CP-violating asymmetry in the eta -> pi(+)pi(-)e(+)e(-)(gamma) decay at KLOE. PHYSICS LETTERS. SECTION B, 675(3-4), 283-288 [10.1016/j.physletb.2009.04.013].
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11590/120395
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 49
  • ???jsp.display-item.citation.isi??? 37
social impact