A possible signature of new physics at BES-Ⅲ

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ZOU Jia-Heng, LI Hai-Bo and ZHANG Xue-Yao. A possible signature of new physics at BES-Ⅲ[J]. Chinese Physics C, 2009, 33(1): 1-5. doi: 10.1088/1674-1137/33/1/001
ZOU Jia-Heng, LI Hai-Bo and ZHANG Xue-Yao. A possible signature of new physics at BES-Ⅲ[J]. Chinese Physics C, 2009, 33(1): 1-5.  doi: 10.1088/1674-1137/33/1/001 shu
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Received: 2008-06-30
Revised: 2008-08-04
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A possible signature of new physics at BES-Ⅲ

Abstract: 

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 fDs differs from the most precise unquenched lattice QCD calculation by a level of 4σ. 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.

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