A possible signature of new physics at BES-

• Published in: Chinese physics C Vol. 33; no. 1; pp. 1 - 5
• Main Author: 邹佳恒 李海波 张学尧
• Format: Journal Article
• Language: English
• Published: Physics Department,Shandong University,Jinan 250100,China%Institute of High Energy Physics,CAS,P.O.Box 918,Beijing 100049,China 2009
• Subjects: 物理学; 衰减常数; 高能物理学; decay constant; BES-; QCD; leptonic decay
• ISSN: 1674-1137; 0254-3052

The recent observations of the purely leptonic decay Ds＋→μ＋νμ and τ＋ντ at CLEO-c and B factory may allow a possible contribution from a charged Higgs boson. One such measurement of the decay constant fD. differs from the most precise unquenched lattice QCD calculation by a level of 4 σ. Meanwhile, the measured ratio, BR（Ds＋→μ＋νμ）/BR（D＋→μ＋νμ）, is larger than the standard model prediction at a 2.0σ level. We discuss that the precise measurement of the ratio BR（Ds＋→μ＋νμ）/BR（D＋→μ＋νμ） at BES-Ⅲ will shed light on the presence of new intermediate particles by comparing the data with the theoretical predictions, especially, the predictions of high precise unquenched lattice QCD calculations.