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arXiv 1302.1907hep-ex
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e+e-来自BABAR的结果和对g-2的影响

e+e- results from BABAR and implications for g-2

Michel Davier

摘要:

BABAR合作组已基本完成了用初态辐射(ISR)方法精确测量阈能到3-5 GeV的e+e->强子主要通道的截面的计划,即用与束成大角度的高能光子测量e+e-> γ强子的截面。这些数据被用来作为输入真空极化色散积分,特别是强子贡献μ介子g-2异常。除了最近测得的π + π-截面外,许多多强子通道也被研究过,并给出了一些最近的例子。利用BABAR探测器在e+e-质心能量接近10.6 GeV时收集的232 fb-1数据,给出了e+e-> K+K-(γ)过程的初步结果。在这个通道中,得到了μ子磁异常中强子真空极化项的最低阶贡献:amu-KK-LO=(22.95 +-0.14(stat)+-0.22(syst))10^-10,这比以前的世界平均值精确了大约三倍。

英文摘要:

The BABAR collaboration has nearly completed a program of precise measurements of the cross sections for the dominant channels of e+e- --> hadrons from threshold to an energy of 3-5 GeV using the initial-state radiation (ISR) method, i.e. the measurement of the cross sections e+e- --> gamma hadrons with the energetic photon detected at large angle to the beams. These data are used as input to vacuum polarization dispersion integrals, in particular the hadronic contribution to the muon g-2 anomaly. In addition to the recently measured pi+pi- cross section, giving the dominant contibution, many multihadronic channels have been investigated, with some recent examples presented here. We give preliminary results for the process e+e- --> K+K-(gamma) using 232 fb-1 of data collected with the BABAR detector at e+e- center-of-mass energies near 10.6 GeV. The lowest-order contribution to the hadronic vacuum polarization term in the muon magnetic anomaly is obtained for this channel: amu-KK-LO=(22.95 +-0.14(stat) +-0.22(syst)) 10^-10, which is about a factor of three more precise than the previous world average value.

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