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Measurement of Semileptonic B Decays into Orbitally-Excited Charmed Mesons

Collaboration
Aug, 2008
7 pages
Published in:
  • Phys.Rev.Lett. 103 (2009) 051803
e-Print:
DOI:
Report number:
  • BABAR-PUB-08-043,
  • SLAC-PUB-13348
Experiments:
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Abstract: (arXiv)
We present a study of B decays into semileptonic final states containing charged and neutral D1(2420)D_1(2420) and D2∗(2460)D_2^*(2460). The analysis is based on a data sample of 208fb−1208 fb^{-1} collected at the Υ(4S)\Upsilon(4S) resonance with the BaBar detector at the PEP-II asymmetric-energy BB Factory at SLAC. With a simultaneous fit to four different decay chains, the semileptonic branching fractions are extracted from measurements of the mass difference Δm=m(D∗∗)−m(D)\Delta m=m(D**)-m(D) distributions. Product branching fractions are determined to be BR(B+−>D10ℓ+νℓ)xBR(D10−>D∗+π−)=(2.97+/−0.17+/−0.17)x10−3BR(B^+ -> D_1^0 \ell^+ \nu_{\ell}) x BR(D_1^0 -> D*^+ \pi^-) = (2.97 +/- 0.17 +/- 0.17) x 10^{-3}, BR(B+−>D2∗0ℓ+νℓ)xBR(D2∗0−>D(∗)+π−)=(2.29+/−0.23+/−0.21)x10−3BR(B^+ -> D_2^{*0} \ell^+ \nu_{\ell}) x BR(D_2^{*0} -> D^{(*)+} \pi^-) = (2.29 +/- 0.23 +/- 0.21) x 10^{-3}, BR(B0−>D1−ℓ+νℓ)xBR(D1−−>D∗0π−)=(2.78+/−0.24+/−0.25)10−3BR(B^0 -> D_1^- \ell^+ \nu_{\ell}) x BR(D_1^- -> D*^0 \pi^-) = (2.78 +/- 0.24 +/- 0.25) 10^{-3} and BR(B0−>D2∗−ℓ+νℓ)xBR(D2∗−−>D(∗)0π−)=(1.77+/−0.26+−/0.11)10−3BR(B^0 -> D_2^{*-} \ell^+ \nu_{\ell}) x BR(D_2^{*-} -> D^{(*)0} \pi^-) = (1.77 +/- 0.26 +-/ 0.11) 10^{-3}. In addition we measure the branching ratio Γ(D2∗−>Dπ−)/Γ(D2∗−>D(∗)π−)=0.62+/−0.03+/−0.02\Gamma(D_2^* -> D \pi^-)/\Gamma(D_2^* -> D^{(*)} \pi^-) = 0.62 +/- 0.03 +/- 0.02.
Note:
  • 7 pages, 1 figure v2: synchronized to version published
  • 13.20.He
  • 13.25.Ft
  • 14.40.Lb
  • electron positron: annihilation
  • B: pair production
  • B: semileptonic decay
  • B+: branching ratio
  • B0: branching ratio
  • D1(2420): hadronic decay
  • D*2(2460): hadronic decay