Exclusive and inclusive semileptonic decays of B mesons to D mesons
We report new measurements of the branching fractions B ( B − → D 0 l − ¯ ν ) , B ( ¯ B 0 → D + l − ¯ ν ) , and B ( B − → D * 0 l − ¯ ν ) . Combining these results with our previous measurement of B ( ¯ B 0 → D * + l − ¯ ν ) , we find that the ratio of semileptonic widths for final states with a vec...
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| 格式: | text |
| 語言: | English |
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Institutional Knowledge at Singapore Management University
1991
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| 在線閱讀: | https://ink.library.smu.edu.sg/sis_research/5812 https://ink.library.smu.edu.sg/context/sis_research/article/6815/viewcontent/Baringer_2_1_1991.pdf |
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| 總結: | We report new measurements of the branching fractions B ( B − → D 0 l − ¯ ν ) , B ( ¯ B 0 → D + l − ¯ ν ) , and B ( B − → D * 0 l − ¯ ν ) . Combining these results with our previous measurement of B ( ¯ B 0 → D * + l − ¯ ν ) , we find that the ratio of semileptonic widths for final states with a vector meson and pseudoscalar meson is ( 2.6 + 1.1 + 1.0 − 0.6 − 0.8 ) and the ratio of charged- to neutral- B -meson lifetimes is ( 0.89 ± 0.19 ± 0 . 1 3 ) ( f 00 f + − ) where ( f 00 f + − ) is the ratio of neutral- to charged- B -meson production at the Υ ( 4 S ) . From the ¯ B → D l − ¯ ν branching fraction, we calculate | V cb | = 0.040 ± 0.006 ± 0.006 , where the first error is statistical and the second is systematic and dominated by the uncertainty in the B -meson lifetime. |
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