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Measurement of $��(��\to ��^+��^-��)/��(��\to ��^+��^-��^0)$ with KLOE experiment

Authors :
The KLOE Collaboration
Ambrosino, F.
Antonelli, A.
Antonelli, M.
Archilli, F.
Balwierz, I.
Bencivenni, G.
Bini, C.
Bloise, C.
Bocchetta, S.
Bossi, F.
Branchini, P.
Capon, G.
Capussela, T.
Ceradini, F.
Ciambrone, P.
Czerwiski, E.
De Lucia, E.
De Santis, A.
De Simone, P.
De Zorzi, G.
Denig, A.
Di Domenico, A.
Di Donato, C.
Di Micco, B.
Dreucci, M.
Felici, G.
Fiore, S.
Franzini, P.
Gatti, C.
Gauzzi, P.
Giovannella, S.
Graziani, E.
Jacewicz, M.
Lee-Franzini, J.
Martemianov, M.
Martini, M.
Massarotti, P.
Meola, S.
Miscetti, S.
Morello, G.
Moulson, M.
Muller, S.
Napolitano, M.
Nguyen, F.
Palutan, M.
Passeri, A.
Patera, V.
Longhi, I. Prado
Santangelo, P.
Sciascia, B.
Silarski, M.
Spadaro, T.
Taccini, C.
Tortora, L.
Venanzoni, G.
Versaci, R.
Xu, G.
Zdebik, J.
collaboration, as members of the KLOE-2
Babusci, D.
Badoni, D.
Bocci, V.
Budano, A.
Bulychjev, S. A.
Campana, P.
Dan��, E.
De Robertis, G.
Domenici, D.
Erriquez, O.
Fanizzi, G.
Gonnella, F.
Happacher, F.
H��istad, B.
Iarocci, E.
Johansson, T.
Kulikov, V.
Kupsc, A.
Loddo, F.
Matsyuk, M.
Messi, R.
Moricciani, D.
Moskal, P.
Ranieri, A.
Sarra, I.
Schioppa, M.
Sciubba, A.
Wi��licki, W.
Wolke, M.
Publication Year :
2011
Publisher :
arXiv, 2011.

Abstract

We report the measurement of the ratio $��(��\to ��^+��^-��)/��(��\to ��^+��^-��^0)$ analyzing a large sample of $��\to ����$ decays recorded with the KLOE experiment at the DA$��$NE $e^+ e^-$ collider, corresponding to an integrated luminosity of 558 pb$^{-1}$. The $��\to ��^+��^-��$ process is supposed to proceed both via a resonant contribution, mediated by the $��$ meson, and a non resonant direct term, connected to the box anomaly. The presence of the direct term affects the partial width value. Our result $R_��=��(��\to ��^+ ��^- ��)/��(��\to ��^+ ��^- ��^0)= 0.1838\pm 0.0005_{stat} \pm 0.0030_{syst}$ is in agreement with a recent CLEO measurement, which differs by more 3 $��$ from the average of previous results.

Subjects

Subjects :
High Energy Physics - Experiment (hep-ex)
FOS: Physical sciences

Details

Database :
OpenAIRE
Accession number :
edsair.doi...........8f29dc76c8e90b7de108a3649627c0b1
Full Text :
https://doi.org/10.48550/arxiv.1107.5733
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