phi(1020) 夸克分支比直接测量
高能物理 - 实验
2008-11-26 v1
摘要
SND 检测器在 phi(1020) 共振能区对 e+e-->mu+mu- 过程进行研究。测得的有效 phi 介子夸克分支比：B(phi->l+l-)=sqrt{B(phi->e+e-)*B(phi->mu+mu-)}=(2.89+-0.10+-0.06)*10^{-4}，与 PDG 值 B(phi->e+e-)=(2.91+-0.07)*10^{-4} 良好一致，确认了 mu-e 普适性。若不假设 mu-e 普适性，得到的分支比 B(phi->mu+mu-)=(2.87+-0.20+-0.14)*10^{-4}。
引用
@article{arxiv.hep-ex/0102029,
title = {Direct measurement of the phi(1020) leptonic branching ratio},
author = {M. N. Achasov and K. I. Beloborodov and A. V. Berdyugin and A. G. Bogdanchikov and A. V. Bozhenok and A. D. Bukin and D. A. Bukin and S. V. Burdin and T. V. Dimova and A. A. Drozdetsky and V. P. Druzhinin and M. S. Dubrovin and I. A. Gaponenko and V. B. Golubev and V. N. Ivanchenko and P. M. Ivanov and A. A. Korol and S. V. Koshuba and A. P. Lysenko and I. N. Nesterenko and E. V. Pakhtusova and E. A. Perevedentsev and A. A. Salnikov and S. I. Serednyakov and V. V. Shary and Yu. M. Shatunov and V. A. Sidorov and Z. K. Silagadze and A. N. Skrinsky and Yu. V. Usov and A. V. Vasiljev},
journal= {arXiv preprint arXiv:hep-ex/0102029},
year = {2008}
}
备注
RevTeX, 5 pages, 3 figures. To be published in Phys. Rev. Lett