Decays of B, B_s and B_c to D-wave heavy-light mesons
release_6v3faahswvcmnfzfzrbpx7ffgu
by
Qiang Li, Tianhong Wang, Yue Jiang, Han Yuan, Tian Zhou, Guo-Li Wang
2016
Abstract
We study the weak decays of B̅_(s) and B_c into D-wave
heavy-light mesons, including J^P=2^- (D_(s)2,D'_(s)2,B_(s)2,
B'_(s)2) and 3^- (D^*_(s)3, B^*_(s)3) states. The weak decay
hadronic matrix elements are achieved based on the instantaneous Bethe-Salpeter
method. The branching ratios for B̅ decays are B[B̅→
D_2eν̅_e] = 1.1^-0.3_+0.3× 10^-3, B[B̅→
D'_2eν̅_e]=4.1^-0.8_+0.9× 10^-4, and
B[B̅→ D^*_3eν̅_e]=1.0^-0.2_+0.2× 10^-3,
respectively. For semi-electronic decays of B̅_s to D_s2, D'_s2,
and D^*_s3, the corresponding branching ratios are 1.7^-0.5_+0.5×
10^-3, 5.2^-1.5_+1.6× 10^-4, and 1.5^-0.4_+0.4×
10^-3, respectively. The branching ratios of semi-electronic decays of B_c
to D-wave D mesons are in the order of 10^-5. We also achieved the
forward-backward asymmetry, angular spectra, and lepton momentum spectra. In
particular the distribution of decay widths for 2^- states D_2 and D'_2
varying along with mixing angle are presented.
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