Observation of Decays in Collisions at the Resonance
We report on measurements of the decays of $$\bar{B}$$ mesons into the semileptonic final states $$\bar{B}$$→D(*)π+π-l-$$\bar{v}$$, where D(*) represents a D or D* meson and l- is an electron or a muon. These measurements are based on 471×106 B$$\bar{B}$$ pairs recorded with the BABAR detector at the SLAC asymmetric B factory PEP-II. We determine the branching fraction ratios R$$(*)\atop{π+π-}$$ = B($$\bar{B}$$→D(*)π+π-l-$$\bar{v}$$)/B($$\bar{B}$$→D(*)l-$$\bar{v}$$) using events in which the second B meson is fully reconstructed. We find Rπ+π-=0.067 ± 0.010 ± 0.008 and R$$*\atop{π+π-}$$ = 0.019 ± 0.005 ± 0.004, where the first uncertainty is statistical and the second is systematic. Lastly, based on these results and assuming isospin invariance, we estimate that $$\bar{B}$$→D(*)ππl-$$\bar{v}$$ decays, where π denotes either a π± and π0 meson, account for up to half the difference between the measured inclusive semileptonic branching fraction to charm hadrons and the corresponding sum of previously measured exclusive branching fractions.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- Contributing Organization:
- BABAR Collaboration
- Grant/Contract Number:
- AC02-05CH11231
- OSTI ID:
- 1393014
- Alternate ID(s):
- OSTI ID: 1236087
- Journal Information:
- Physical Review Letters, Vol. 116, Issue 4; ISSN 0031-9007
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Measurement of the branching fraction of at Belle using hadronic tagging in fully reconstructed events
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journal | July 2018 |
Measurement of the branching fraction of $B → D ^{(*)} π ℓ ν$ at Belle using hadronic tagging in fully reconstructed events
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text | January 2018 |
Measurement of the branching fraction of $B → D ^{(*)} π ℓ ν$ at Belle using hadronic tagging in fully reconstructed events
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text | January 2018 |
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