New upper limit on the decay η → e + e Gollin, G. D.; Marsh, M. A.; Palmer, M. ...
Physical review. D, Particles and fields,
11/1997, Letnik:
56, Številka:
9
Journal Article
Using the CLEO II detector, we have obtained evidence for a new meson decaying to ital Dsup 0ital Ksup +. Its mass is 2573.2sub minus1.6sup +1.7plus minus0.8plus minus0.5 MeV/ital csup 2 and its ...width is 16sub minus4sup +5plus minus3 MeV/ital csup 2. Although we do not establish its spin and parity, the new meson is consistent with predictions for an ital L=1, ital S=1, ital Jsup ital P=2sup + charmed strange state.
Using the CLEO detector at the Cornell Electron Storage Ring, we have performed a direct measurement of the ratio of {ital D}{sup 0} semileptonic branching fractions into vector and pseudoscalar ...final states. We find {ital B}({ital D}{sup 0}{r arrow}{ital K}{sup *{minus}}{ital e+}{nu}{sub {ital e}})/{ital B}({ital D}{sup 0}{r arrow}{ital K}{sup {minus}}{ital e+}{nu}{sub {ital e}})=0.51{plus minus} 0.18{plus minus}0.06, in agreement with the ratio derived by the E691 experiment which compares {ital D}{sup +} and {ital D}{sup 0} final states. We also set an upper limit on the ratio {ital B}({ital D}{sup 0}{r arrow}{ital {bar K}}{sup *0}{pi}{sup {minus}}{ital e+}{nu}{sub {ital e}})/{ital B}({ital D}{sup 0}{r arrow}{ital K}{sup *{minus}}{ital e}{nu}{sub {ital e}}){lt}0.64 at 90% confidence level.
Inclusive decay B--> eta X Kubota, Y; Lattery, M; Momayezi, M ...
Physical review. D, Particles and fields,
06/1996, Letnik:
53, Številka:
11
Journal Article
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