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Title: Observation of B ¯ D ( * ) π + π - - ν ¯ Decays in e + e - Collisions at the Υ ( 4 S ) Resonance

Journal Article · · Physical Review Letters
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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
Citation Metrics:
Cited by: 14 works
Citation information provided by
Web of Science

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