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Chinese Physics C> 1996, Vol. 20> Issue(3) : 193-203 

Measurement of Ds Decay Constant

  •  Institute of High Energy Physics, The Chinese Academy of Sciences,Beijing 100039

  • Using the method of tabing a μ first, then checking the recoil side to see if it is a Ds meson, two Ds→μv and three Ds→τv→μvvv candidate events are found from a data sample corresponding to 22.3ph－1, which has been collected at BES at Ecm=4.03GeV.The absolute branching ratio of Ds leptonic decay are determined to be Br(Ds→μv)=(0.72+0.70－0.44)% and Br(Ds→τv)=(14+11－8)%. And the Ds decay constant which is independent of any model is given as fDs=(355+96+28－90－28)MeV.
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  • References

    [1] J.Z.Bai,et al,Nucl.Instr.and Meth.in Phys Res,A344（1994）319.[2] Particle Data Group,Phys Rev,D50（1994）1173.[3] F.J.Gilman,M.B.Wise,Phys Rev.D27（1983）1128;C.Bemald et al,Phys Rev.,D338（1988）3540;M.B.Gavela et al.,Phys Lett.,B206（1988）113;T ADegrand,R.D Loft,Phys Rev,D38（1988）954;H.Krasemann,Phys Lett,B96（1980）397;M.Suzuki,Phys Lett,B162（1985）391;S.N Sinha,Phys.Lett,B178（1986）110;S.Capstick,S.Godfrey,Phys Rev,D41（1990）2856;C.Dominguez,N Paver,Phys Lett.,B197（1987）423;S.Narison,Phys Lett,B198（1987）104;J.L.Rosner,Phys.Rev.,D42（1990）3732.[4] JAdler et al,Phys.Rev Lett,60（1988）1375;A.Aoki et al,Prog.Theo Phys,89（1993）131;D Acosta,et al,Phys. Rev. D49（1993）5690[5]郁忠强等，高能物理与核物理，19（1995）1062.[6]顾建辉等，高能物理与核物理，20（1996）26.[7]陈少敏，中科院高能物理所，B ES内部报告。[8] F James,M.Roos,MINUI,CERN Computer Center Proguam Library Long Writeup[9] J、Z.Bai et al,Phys.Rev.Lett.,74（1995）4599

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BES Collaboration. Measurement of Ds Decay Constant[J]. Chinese Physics C, 1996, 20(3): 193-203.
BES Collaboration. Measurement of Ds Decay Constant[J]. Chinese Physics C, 1996, 20(3): 193-203. shu
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Received: 1900-01-01
Revised: 1900-01-01
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Measurement of Ds Decay Constant

  • Institute of High Energy Physics, The Chinese Academy of Sciences,Beijing 100039
  • Received Date: 1900-01-01
  • Accepted Date: 1900-01-01
  • Available Online: 1996-03-05

Abstract: Using the method of tabing a μ first, then checking the recoil side to see if it is a Ds meson, two Ds→μv and three Ds→τv→μvvv candidate events are found from a data sample corresponding to 22.3ph－1, which has been collected at BES at Ecm=4.03GeV.The absolute branching ratio of Ds leptonic decay are determined to be Br(Ds→μv)=(0.72+0.70－0.44)% and Br(Ds→τv)=(14+11－8)%. And the Ds decay constant which is independent of any model is given as fDs=(355+96+28－90－28)MeV.

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