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Please use this identifier to cite or link to this item: http://hdl.handle.net/2307/358

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
Dipartimento di Fisica 'Edoardo Amaldi'

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