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arXiv 1107.5733hep-ex
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用KLOE实验测量$Γ(η\to π^+π^-γ)/Γ(η\to π^+π^-π^0)$

Measurement of $Γ(η\to π^+π^-γ)/Γ(η\to π^+π^-π^0)$ with KLOE experiment

The KLOE Collaboration, F. Ambrosino, A. Antonelli, M. Antonelli, F. Archilli, I. Balwierz, G. Bencivenni, C. Bini, C. Bloise, S. Bocchetta, F. Bossi, P. Branch… 展开作者

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

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摘要：

我们报告的比率$Γ(η\to π^+π^-γ)/Γ(η\to π^+π^-π^0)$的测量分析的大样本的$ϕ\to ηγ$衰变记录与KLOE实验在DA $Φ$ NE $e^+ e^-$对撞机，对应于558 pb的积分光度$^{-1}$。假设$η\to π^+π^-γ$过程通过由$ρ$介子介导的共振贡献和连接到盒异常的非共振直接项进行。直接项的存在影响部分宽度值。我们的结果$R_η=Γ(η\to π^+ π^- γ)/Γ(η\to π^+ π^- π^0)= 0.1838\pm 0.0005_{stat} \pm 0.0030_{syst}$与最近的CLEO测量结果一致，与以前的结果的平均值相差3个$σ$以上。

英文摘要：

We report the measurement of the ratio $Γ(η\to π^+π^-γ)/Γ(η\to π^+π^-π^0)$ analyzing a large sample of $ϕ\to ηγ$ decays recorded with the KLOE experiment at the DA$Φ$NE $e^+ e^-$ collider, corresponding to an integrated luminosity of 558 pb$^{-1}$. The $η\to π^+π^-γ$ process is supposed to proceed both via a resonant contribution, mediated by the $ρ$ 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 $R_η=Γ(η\to π^+ π^- γ)/Γ(η\to π^+ π^- π^0)= 0.1838\pm 0.0005_{stat} \pm 0.0030_{syst}$ is in agreement with a recent CLEO measurement, which differs by more 3 $σ$ from the average of previous results.

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