Title

Measurement of B→Ds(*)+D*(*) branching fractions

Document Type

Article

Publication Date

12-1-2000

Abstract

This article describes improved measurements by CLEO of the B →D D* and B →D * D* branching fractions, and first evidence for the decay B →D (*) D̄** , where D̄** represents the sum of the D̄ (2420) , D̄ *(2460) , and D̄ (j = 1/2) L = 1 charm meson states. Also reported is the first measurement of the D * polarization in the decay B →D * D* . A partial reconstruction technique, employing only the fully reconstructed D and slow pion π from the D* →D̄ π decay, enhances sensitivity. The observed branching fractions are B(B →D D* ) = (1.10±0.18±0.10±0.28)%, B(B →D * D* ) = (1.82±0.37±0.24 ±0.46)% , and B(B →D (*) D̄** ) = (2.73±0.78±0.48±0.68)%, where the first error is statistical, the second systematic, and the third is the uncertainty in the D →φπ branching fraction. The measured D * longitudinal polarization, Γ /Γ = (50.6±13.9±3.6)%, is consistent with the factorization prediction of 54%. 0 + - 0 + - + + 0 0 0 0 0 + 0 + - + - - 0 - 0 + - 0 + - + + 0 + + + s s s 1 2 1 s s s s s s s s s s L

Publication Name

Physical Review D - Particles, Fields, Gravitation and Cosmology

Volume Number

62

First Page

1

Last Page

13

Issue Number

11

Article

112003

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