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arXiv 0704.2773hep-ex
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Upgraded-> gamma + R衰变上限的测量

Measurement of Upper Limits for Upsilon --> gamma + R Decays

J. L Rosner, CLEO Collaboration

摘要:

出于对最近测量到的包含Uppersons(nS)->gamma+X(n=1,2,3)直接光子谱可能的两体贡献的关注,我们报道了这些窄Uppersons(nS)共振到两体末态R+gamma的排他性辐射衰变的新研究,其中R是一个窄共振强子态,衰变为四个或更多个带电粒子。这样的两体过程没有明确地解决在现有的理论框架用于计算包括直接光子光谱,也必须明确地插入到蒙特卡罗模拟。使用收集的数据从CLEO III探测器在康奈尔电子储存环,我们目前的上限为0.01%,这样的bottomonium两体衰变作为R反冲质量的函数。

英文摘要:

Motivated by concerns regarding possible two-body contributions to the recently-measured inclusive Upsilon(nS)->gamma+X (n=1, 2, 3) direct photon spectra, we report on a new study of exclusive radiative decays of these narrow Upsilon(nS) resonances into two-body final states R+gamma, with R a narrow resonant hadronic state decaying into four or more charged particles. Such two-body processes are not explicitly addressed in the extant theoretical frameworks used to calculate the inclusive direct photon spectra, and must also be explicitly inserted into Monte Carlo simulations. Using data collected from the CLEO III detector at the Cornell Electron Storage Ring, we present upper limits of order 0.01 per cent for such bottomonium two-body decays as a function of the R recoil mass.

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