K- -> pi0 e- nu衰变形状因子的高统计测量
高能物理 - 实验
2008-11-26 v1
摘要
利用ISTRA+谱仪探测到的飞行中衰变研究了K- -> pi0 e- nu衰变。分析中收集了约92万事件。在线性近似下测量了衰变形状因子f+(t)的lambda+斜率参数(平均斜率)：lambda+(lin)= 0.02774 +- 0.00047(stat) +- 0.00032(syst)。形状因子的二次项贡献估计为lambda'+ = 0.00084 +- 0.00027(stat) +- 0.00031(syst)。对于此拟合，具有df+(t)/dt|_{t=0}意义的线性斜率为lambda+ = 0.02324 +- 0.00152(stat) +- 0.00032(syst)。推导了可能的张量和标量耦合的上限：f_{T}/f_{+}(0)=-0.012 +- 0.021(stat) +- 0.011(syst)，f_{S}/f_{+}(0)=-0.0037^{+0.0066}_{-0.0056}(stat) +- 0.0041(syst)。
引用
@article{arxiv.hep-ex/0404030,
title = {High statistic measurement of the K- -> pi0 e- nu decay form-factors},
author = {O. P. Yushchenko and S. A. Akimenko and G. I. Britvich and K. V. Datsko and A. P. Filin and A. V. Inyakin and A. S. Konstantinov and V. F. Konstantinov and I. Y. Korolkov and V. A. Khmelnikov and V. M. Leontiev and V. P. Novikov and V. F. Obraztsov and V. A. Polyakov and V. I. Romanovsky and V. M. Ronjin and V. I. Shelikhov and N. E. Smirnov and O. G. Tchikilev and V. A. Uvarov and V. N. Bolotov and S. V. Laptev and A. Yu. Polyarush},
journal= {arXiv preprint arXiv:hep-ex/0404030},
year = {2008}
}
备注
11 pages, 8 figures. Accepted by Phys.Lett. B