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arXiv 0811.1007hep-ex
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用KLOE探测器寻找K_S -> e+e-衰变

Search for the K_S -> e+e- decay with the KLOE detector

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

The KLOE Collaboration, F. Ambrosino, A. Antonelli, M. Antonelli, F. Archilli, P. Beltrame, G. Bencivenni, S. Bertolucci, C. Bini, C. Bloise, S. Bocchetta, F. Bossi, P. Branchini, P. Campana, G. Capon, D. Capriotti, T. Capussela, F. Ceradini, P. Ciambrone, F. Crucianelli, 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, M. L. Ferrer, S. Fiore, P. Franzini, C. Gatti, P. Gauzzi, S. Giovannella, E. Graziani, W. Kluge, V. Kulikov, G. Lanfranchi, J. Lee-Franzini, D. Leone, M. Martini, P. Massarotti, S. Meola, S. Miscetti, M. Moulson, S. Mueller, F. Murtas, M. Napolitano, F. Nguyen, M. Palutan, E. Pasqualucci, A. Passeri, V. Patera, F. Perfetto, P. Santangelo, B. Sciascia, A. Sciubba, A. Sibidanov, T. Spadaro, M. Testa, L. Tortora, P. Valente, G. Venanzoni, R. Versaci

摘要:

我们给出了对衰变K_S -> e+e-的直接搜索结果,该结果是用在弗拉斯卡蒂φ工厂DAFNE产生的e+e- -> phi -> K_S K_L事件的样本获得的,其积分亮度为1.9 fb^-1。我们用一束纯K_S光束在量热计中同时探测到K_L相互作用来进行搜索。背景拒绝已被优化,通过使用运动学和粒子识别削减。我们发现,在90% CL时,BR(K_S -> e+e-)<9 × 10 ^-9,比之前的最佳极限提高了一个数量级。

英文摘要:

We present the result of a direct search for the decay K_S -> e+e-, obtained with a sample of e+e- -> phi -> K_S K_L events produced at DAFNE, the Frascati phi-factory, for an integrated luminosity of 1.9 fb^-1. The search has been performed using a pure K_S beam tagged by the simultaneous detection of a K_L interaction in the calorimeter. Background rejection has been optimized by using both kinematic and particle identification cuts. We find BR(K_S -> e+e-) < 9x10^-9 at 90% CL, which improves by an order of magnitude on the previous best limit.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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