| Title: | Measurement of the branching ratio and search for a CP violating asymmetry in the η→π+π−e+e− (γ ) decay at KLOE |
Authors: | Ambrosino, F.
Antonelli, A.
Antonelli, M.
Archilli, F.
Beltrame, P.
Bencivenni, G.
Bertolucci, S.
Bini, C.
Bloise, C.
Bocchetta, Simona
Bossi, F.
Branchini, Paolo
Capon, G.
Capussela, T.
Ceradini, Filippo
Ciambrone, P.
Crucianelli, F.
De Lucia, E.
De Santis, A.
De Simone, P.
De Zorzi, G.
Denig, A.
Di Domenico, A.
Di Donato, C.
Di Micco, Biagio
Dreucci, M.
Felici, G.
Fiore, S.
Franzini, P.
Gatti, C.
Gauzzi, P.
Giovannella, S.
Graziani, Enrico
Lanfranchi, G.
Lee-Franzini, J.
Leone, D.
Martini, M.
Massarotti, P.
Meola, S.
Miscetti, S.
Moulson, M.
Mueller, S.
Murtas, F.
Napolitano, M.
Nguyen, Federico
Palutan, M.
Pasqualucci, E.
Passeri, Antonio
Patera, V.
Perfetto, F.
Santangelo, P.
Sciascia, B.
Spadaro, T.
Testa, M.
Tortora, Ludovico
Valente, P.
Venanzoni, G.
Versaci, R.
Xu, G. |
Keywords: | MONTE-CARLO
ETA-&
gt
PI(+)PI(-)E(+)E(-)
DETECTOR
PHOTOS |
Issue Date: | 18-May-2009 |
Publisher: | Elsevier |
Abstract: | We have studied the η→π+π−e+e− (γ ) decay using about 1.7 fb−1 collected by the KLOE experiment at the DA NE φ-factory. This corresponds to about 72 millions η mesons produced in φ radiative decays. We have measured the branching ratio, inclusive of radiative effects, with 4% accuracy: BR(η→
π+π−e+e− (γ )) = (26.8 ± 0.9Stat. ± 0.7Syst.) × 10−5. We have obtained the first measurement of the CPodd ππ–ee decay planes angular asymmetry, Aφ = (−0.6±2.5Stat. ±1.8Syst.)×10−2. |
URI: | http://hdl.handle.net/2307/358 |
ISSN: | 0370-2693 |
DOI: | 10.1016/j.physletb.2009.04.013 |
| Appears in Collections: | A - Articolo su rivista
X_Dipartimento di Fisica 'Edoardo Amaldi'
|
