arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0708.2874hep-ex
收藏

寻找稀有衰变K_{L} \to π ^{0} π ^{0} γ

Search for the Rare Decay K_{L}\toπ^{0}π^{0}γ

KTeV Collaboration, E. Abouzaid, M. Arenton, A. R. Barker, L. Bellantoni, E. Blucher, G. J. Bock, E. Cheu, R. Coleman, M. D. Corcoran, G. Corti, B. Cox, A. R. E… 展开作者

KTeV Collaboration, E. Abouzaid, M. Arenton, A. R. Barker, L. Bellantoni, E. Blucher, G. J. Bock, E. Cheu, R. Coleman, M. D. Corcoran, G. Corti, B. Cox, A. R. Erwin, C. O. Escobar, A. Glazov, A. Golossanov, R. A. Gomes, P. Gouffon, Y. B. Hsiung, D. A. Jensen, R. Kessler, K. Kotera, A. Ledovskoy, P. L. McBride, E. Monnier, H. Nguyen, R. Niclasen, D. G. Phillips, H. Ping, E. J. Ramberg, R. E. Ray, M. Ronquest, E. Santos, J. Shields, W. Slater, D. Smith, N. Solomey, E. C. Swallow, P. A. Toale, R. Tschirhart, C. Velissaris, Y. W. Wah, J. Wang, H. B. White, J. Whitmore, M. Wilking, R. Winston, E. T. Worcester, M. Worcester, T. Yamanaka, E. D. Zimmerman, R. F. Zukanovich

备注：
six pages and six figures in the submission. Reformatted for Physics Review D
发表信息：
Phys.Rev.D78:032014,2008
阅读 PDF
arXiv 页面 ↗HTML 原文 ↗

摘要：

KTeV E799实验通过拓扑结构$K_{L}\toπ^{0}π^{0}_Dγ$（其中$π^0_D\toγe^+e^-$）对稀有衰变$K_{L}\toπ^{0}π^{0}γ$进行了搜索。由于$π^0$对的玻色统计和光子的真实性质，$K_{L}\toπ^{0}π^{0}γ$衰减被限制为在最低阶由E2电四极子光子的CP守恒直接发射（DE）进行。这种衰变的速率在理论上是有趣的，因为手征微扰理论预测这种过程在$O(p^4)$能级消失。因此，该模式在$O(p^6)$上探索手征微扰理论。本文报道了$K_{L}\toπ^{0}π^{0}γ$的$2.43\times 10^{-7}$上限（90% CL）的测定。这比以前的结果大约低20倍。

英文摘要：

The KTeV E799 experiment has conducted a search for the rare decay $K_{L}\toπ^{0}π^{0}γ$ via the topology $K_{L}\toπ^{0}π^{0}_Dγ$ (where $π^0_D\toγe^+e^-$). Due to Bose statistics of the $π^0$ pair and the real nature of the photon, the $K_{L}\toπ^{0}π^{0}γ$ decay is restricted to proceed at lowest order by the CP conserving direct emission (DE) of an E2 electric quadrupole photon. The rate of this decay is interesting theoretically since chiral perturbation theory predicts that this process vanishes at level $O(p^4)$. Therefore, this mode probes chiral perturbation theory at $O(p^6)$. In this paper we report a determination of an upper limit of $2.43\times 10^{-7}$ (90% CL) for $K_{L}\toπ^{0}π^{0}γ$. This is approximately a factor of 20 lower than previous results.

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。

↑