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arXiv 0707.4130hep-ex
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用KLOE探测器研究e+e- -> omega p0过程

Study of the process e+e- -> omega p0 with the KLOE detector

KLOE collaboration, F. Ambrosino, A. Antonelli, M. Antonelli, F. Archilli, C. Bacci, P. Beltrame, G. Bencivenni, S. Bertolucci, C. Bini, C. Bloise, S. Bocchetta… 展开作者

KLOE collaboration, F. Ambrosino, A. Antonelli, M. Antonelli, F. Archilli, C. Bacci, P. Beltrame, G. Bencivenni, S. Bertolucci, C. Bini, C. Bloise, S. Bocchetta, V. Bocci, F. Bossi, P. Branchini, R. Caloi, P. Campana, G. Capon, T. Capussela, F. Ceradini, S. Chi, G. Chiefari, P. Ciambrone, E. De Lucia, A. De Santis, P. De Simone, G. De Zorzi, A. Denig, A. Di Domenico, C. Di Donato, S. Di Falco, B. Di Micco, A. Doria, M. Dreucci, G. Felici, A. Ferrari, M. L. Ferrer, G. Finocchiaro, S. Fiore, C. Forti, P. Franzini, C. Gatti, P. Gauzzi, S. Giovannella, E. Gorini, E. Graziani, M. Incagli, W. Kluge, V. Kulikov, F. Lacava, G. Lanfranchi, J. Lee-Franzini, D. Leone, M. Martini, P. Massarotti, W. Mei, S. Meola, S. Miscetti, M. Moulson, S. Müller, F. Murtas, M. Napolitano, F. Nguyen, M. Palutan, E. Pasqualucci, A. Passeri, V. Patera a, f, F. Perfetto, M. Primavera, P. Santangelo, G. Saracino, B. Sciascia, A. Sciubba, F. Scuri, I. Sfiligoi, T. Spadaro, M. Testa, L. Tortora, P. Valente, B. Valeriani, G. Venanzoni, R. Versaci, G. Xu

摘要:

利用DAPhiNE的KLOE探测器收集的~600 pb ~(-1),研究了质心能量在1000 - 1030 MeV之间的e+e碰撞中π + π-π 0 π 0和p 0 p 0 γ末态的产生截面。通过对两个最终状态的Mphi周围的观测到的干涉图案进行拟合,我们提取了比率Gamma(omega -> pi 0 gamma)/Gamma(omega -> pi+ pi-pi 0)= 0.0934 +-0.0022的测量(初步)。由于这两个最终状态代表了98%的ω衰变通道,我们使用么正性来推导BR(ω-> pi+ pi-pi 0)=(89.94 +- 0.23)%和BR(ω-> pi 0 gamma)=(8.40 +- 0.19)%。此外,描述围绕Mphi的e+e-> pi+ pi-pi 0 pi 0反应的参数被用来提取OZI和G宇称违反phi -> omega pi 0衰变的分支分数:BR(phi -> omega pi 0)=(5.63 +- 0.70)x 10^-5。

英文摘要:

Using ~600 pb-1 collected with the KLOE detector at DAPhiNE, we have studied the production cross section of pi+ pi- pi0 pi0 and p0p0 gamma final states in e+e- collisions at center of mass energies between 1000 and 1030 MeV. By fitting the observed interference pattern around Mphi for both final states, we extract a measurement (preliminary) for the ratio Gamma(omega -> pi0 gamma)/Gamma(omega -> pi+ pi- pi0) = 0.0934 +- 0.0022. Since these two final states represent the 98% of the omega decay channels, we use unitarity to derive BR(omega -> pi+pi-pi0)= (89.94 +- 0.23)% and BR(omega -> pi0 gamma) = (8.40 +- 0.19)%. Moreover, the parameters describing the e+e- -> pi+ pi- pi0 pi0 reaction around Mphi are used to extract the branching fraction for the OZI and G-parity violating phi -> omega pi0 decay: BR(phi -> omega pi0) = (5.63 +- 0.70) x 10^-5.

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