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arXiv 1409.4582hep-ex
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用KLOE探测器研究Dalitz衰变φ-> eta e+e-

Study of Dalitz decay phi -> eta e+e- with KLOE detector

D. Babusci, I. Balwierz-Pytko, G. Bencivenni, C. Bloise, F. Bossi, P. Branchini, A. Budano, L. Caldeira Balkestahl, F. Ceradini, P. Ciambrone, F. Curciarello, E… 展开作者

D. Babusci, I. Balwierz-Pytko, G. Bencivenni, C. Bloise, F. Bossi, P. Branchini, A. Budano, L. Caldeira Balkestahl, F. Ceradini, P. Ciambrone, F. Curciarello, E. Czerwinski, E. Dane', V. De Leo, E. De Lucia, G. De Robertis, A. De Santis, P. De Simone, A. Di Cicco, A. Di Domenico, R. Di Salvo, D. Domenici, O. Erriquez, G. Fanizzi, A. Fantini, G. Felici, S. Fiore, P. Franzini, A. Gajos, P. Gauzzi, G. Giardina, S. Giovannella, E. Graziani, F. Happacher, L. Heijkenskjold, B. Hoistad, T. Johansson, D. Kaminska, W. Krzemien, A. Kupsc, J. Lee-Franzini, F. Loddo, S. Loffredo, G. Mandaglio, M. Martemianov, M. Martini, M. Mascolo, R. Messi, S. Miscetti, G. Morello, D. Moricciani, P. Moskal, A. Palladino, A. Passeri, V. Patera. Prado Longhi, A. Ranieri, P. Santangelo, I. Sarra, M. Schioppa, B. Sciascia, M. Silarski, L. Tortora, G. Venanzoni, W. Wislicki, M. Wolke

摘要:

我们用DAPHNE的KLOE探测器研究了矢量到赝标转换衰变phi -> eta e+e-,其中eta -> pi 0 pi 0 pi 0。在sqrt(s)~Mphi处的1.7 fb-1的e+e-碰撞数据集包含约31,000个事件的清晰转换衰减信号,我们从中测量了BR(phi -> eta e+e-)=(1.075+-0.007+-0.038 x10 -4)的值。使用相同的样品通过拟合e+e不变质谱来确定跃迁形状因子,得到b(phi eta)=(1.17 +-0.10 + 0.07)GeV-2,这将先前测量的精度提高了五倍,并且与VMD预期非常一致。

英文摘要:

We have studied the vector to pseudoscalar conversion decay phi -> eta e+e-, with eta -> pi0pi0pi0, with the KLOE detector at DAPHNE. The data set of 1.7 fb-1 of e+e- collisions at sqrt(s)~Mphi contains a clear conversion decay signal of ~31,000 events from which we measured a value of BR(phi -> eta e+e-)=(1.075+-0.007+-0.038)x10-4. The same sample is used to determine the transition form factor by a fit to the e+e- invariant mass spectrum, obtaining b(phi eta) =(1.17 +- 0.10 + 0.07) GeV-2, that improves by a factor of five the precision of the previous measurement and is in good agreement with VMD expectations.

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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