利用KLOE探测器初态辐射测量从阈值到0.85 GeV^2的sigma(e+ e- -> pi+ pi-)
高能物理 - 实验
2011-06-15 v2
摘要
我们在Frascati的phi工厂DAPHNE上，利用KLOE探测器在质心能量 W=1 GeV 下获取的事件，测量了辐射过程 e+e- -> pi+pi-gamma 的截面。初态辐射使我们能够获得 e+e- -> pi+pi- 的截面、介子形状因子 |F_pi|^2 以及双介子对μ子磁矩反常的贡献，在 0.1 < M_{pipi}^2 < 0.85 GeV^2 范围内，Delta a_mu^{pipi} = (478.5+-2.0_{stat}+-5.0_{syst}+-4.5_{th}) x 10^{-10}，其中理论误差包含了对来自末态介子辐射光子的不确定度的 SU(3) ChPT 估计。标准模型对 a_mu 的计算值与BNL Muon g-2 合作组测量值之间的差异得到了证实。
引用
@article{arxiv.1006.5313,
title = {Measurement of sigma(e+ e- -> pi+ pi-) from threshold to 0.85 GeV^2 using Initial State Radiation with the KLOE detector},
author = {KLOE Collaboration and F. Ambrosino and F. Archilli and P. Beltrame and G. Bencivenni and C. Bini and C. Bloise and S. Bocchetta and F. Bossi and P. Branchini and G. Capon and T. Capussela and F. Ceradini and P. Ciambrone and E. De Lucia and A. De Santis and P. De Simone and G. De Zorzi and A. Denig and A. Di Domenico and C. Di Donato and B. Di Micco and M. Dreucci and G. Felici and S. Fiore and P. Franzini and C. Gatti and P. Gauzzi and S. Giovannella and E. Graziani and M. Jacewicz and W. Kluge and J. Lee-Franzini and D. Leone and P. Massarotti and S. Meola and S. Miscetti and S. Müller and F. Murtas and M. Napolitano and F. Nguyen and A. Passeri and V. Patera and P. Santangelo and C. Taccini and L. Tortora and G. Venanzoni and R. Versaci},
journal= {arXiv preprint arXiv:1006.5313},
year = {2011}
}
备注
17 pages, 11 figures, revised treatment of FSR uncertainty, version to appear on Physics Letters B