Measurement of B(D{sub s}{sup +}{yields}l{sup +}{nu}) and the decay constant f{sub D{sub s}{sup +}} from 600 pb{sup -1} of e{sup +}e{sup -} annihilation data near 4170 MeV
- Cornell University, Ithaca, New York 14853 (United States)
We examine e{sup +}e{sup -}{yields}D{sub s}{sup -}D{sub s}*{sup +} and D{sub s}*{sup -}D{sub s}{sup +} interactions at 4170 MeV using the CLEO-c detector in order to measure the decay constant f{sub D{sub s}{sup +}} with good precision. Previously our measurements were substantially higher than the most precise lattice based QCD calculation of (241{+-}3) MeV. Here we use the D{sub s}{sup +}{yields}l{sup +}{nu} channel, where the l{sup +} designates either a {mu}{sup +} or a {tau}{sup +}, when the {tau}{sup +}{yields}{pi}{sup +}{nu}. Analyzing both modes independently, we determine B(D{sub s}{sup +}{yields}{mu}{sup +}{nu})=(0.565{+-}0.045{+-}0.017)%, and B(D{sub s}{sup +}{yields}{tau}{sup +}{nu})=(6.42{+-}0.81{+-}0.18)%. We also analyze them simultaneously to find an effective value of B{sup eff}(D{sub s}{sup +}{yields}{mu}{sup +}{nu})=(0.591{+-}0.037{+-}0.018)% and f{sub D{sub s}{sup +}}=(263.3{+-}8.2{+-}3.9) MeV. Combining with the CLEO-c value determined independently using D{sub s}{sup +}{yields}{tau}{sup +}{nu}, {tau}{sup +}{yields}e{sup +}{nu}{nu} decays, we extract f{sub D{sub s}{sup +}}=(259.5{+-}6.6{+-}3.1) MeV. Combining with our previous determination of B(D{sup +}{yields}{mu}{sup +}{nu}), we extract the ratio f{sub D{sub s}{sup +}}/f{sub D{sup +}}=1.26{+-}0.06{+-}0.02. No evidence is found for a CP asymmetry between {gamma}(D{sub s}{sup +}{yields}{mu}{sup +}{nu}) and {gamma}(D{sub s}{sup -}{yields}{mu}{sup -}{nu}); specifically the fractional difference in rates is measured to be (4.8{+-}6.1)%. Finally, we find B(D{sub s}{sup +}{yields}e{sup +}{nu})<1.2x10{sup -4} at 90% confidence level.
- OSTI ID:
- 21260053
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 79, Issue 5; Other Information: DOI: 10.1103/PhysRevD.79.052001; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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