Abstract
A sample of 3.6 million hadronic Z decays recorded between 1991 and 1995 with the ALEPH detector at LEP is used to investigate semileptonic decays of B mesons into final states involving orbitally excited charm mesons. Topological vertex criteria are used to search for decays involving narrow D** states as well as wide D** resonances and non-resonant D(*)π final states. The sum of the branching ratios for these processes is measured to be ${⤪ Br}({⩈erline {⤪ B}}⌝ghtarrow {⤪ D}≪ ⫑l^{-}{⩈erline v}) + {⤪ Br}({⩈erline {⤪ B}}⌝ghtarrow {⤪ D}^{⇒t}≪ ⫑l^{-}{⩈erline v})↦op =(2.26 pm 0.29({⤪ stat}) pm 0.33({⤪ syst}))%,$which accounts for a significant fraction of the deficit between inclusive measurements and the sum of exclusive semileptonic B decay modes.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
M. Voloshin and M. Shifman, Sov. J. Nucl. Phys. 45 (1987) 292; M. Voloshin and M. Shifman, Sov. J. Nucl. Phys. 47 (1988) 511; N. Isgur, D. Scora, B. Grinstein, and M. B. Wise, Phys. Rev. D39 (1989) 799; P. Colangelo, G. Nardulli and N. Paver, Phys. Lett. B293 (1992) 207.
M. Neubert, Phys. Reports 245 (1994) 259.
H. Albrecht et al. (ARGUS Collaboration), Phys. Lett. B221 (1989) 422; H. Albrecht et al. (ARGUS Collaboration), Phys. Lett. B232 (1989) 398; J.C. Anjos etal. (E691 Collaboration), Phys. Rev. Lett. 62 (1989) 1717; P. Avery et al. (CLEO Collaboration), Phys. Rev. D41 (1990) 774; P.L. Frabetti et al. (E687 Collaboration), Phys. Rev. Lett. 72 (1994) 324; P. Avery et al. (CLEO II Collaboration), Phys. Lett. B331 (1994) 236.
H. Albrechtet al. (ARGUS Collaboration), Phys. Lett. B231 (1989) 208; P.L. Frabetti et al. (E687 Collaboration), Phys. Rev. Lett. 72 (1994) 324; T. Bergfeld et al. (CLEO II Collaboration) Phys. Lett. B340 (1994) 194.
L. Montanet et al. (Particle Data Group), Phys. Rev. D50 (1994) 1173; the values of the masses and widths of the D≠≠ states and Br(b→ B̅) are taken from R.M. Barnett et al. (Particle Data Group), Phys. Rev. D54 (1996) 1.
S. Godfrey and N. Isgur, Phys. Rev. D32 (1985) 189; S. Godfrey and R. Kokoski, Phys. Rev. D43 (1991) 1679; A.B. Kaidalov and A.V. Nogteva, Sov. J. Nucl. Phys. 47 (1988) 321; J. Rosner, Comments on Nuclear and Particle Physics 16 (1986) 109.
D. Buskulic et al. (ALEPH Collaboration), Phys. Lett. B345 (1994) 103.
H. Albrecht et al. (ARGUS Collaboration), Z. Phys. C57 (1993) 533.
R. Akers et al. (OPAL Collaboration), Z. Phys. C67 (1995) 57.
J.P. Alexander et al. (CLEO Collaboration), CLEO CONF 95-30, contributed paper to the XXVIII International Conference on High Energy Physics, Bruxelles, Belgium, 1995, reference EPS0168.
P. Abreu et al. (DELPHI Collaboration), CERN-PPE-96-11, submitted to Z. Phys.
D. Decamp et al. (ALEPH Collaboration), Nucl. Instr. Meth. A294 (1990) 121.
D. Buskulic et al. (ALEPH Collaboration), Nucl. Instr. Meth. A360 (1995) 481.
G. Batignani et al., IEEE Trans. Nuc. Sci. 39 (1992) 701.
D. Buskulic et al. (ALEPH Collaboration), Nucl. Instr. Meth. A436 (1994) 461.
D. Buskulic et al. (ALEPH Collaboration), Phys. Lett. B313 (1993) 535.
P. Avery et al. (CLEO II Collaboration), Phys. Lett. B331 (1994) 236; H. Albrecht etal. (ARGUS Collaboration), Phys. Lett. B232 (1989) 398.
D. Buskulic et al. (ALEPH Collaboration), Phys. Lett. B357 (1995) 699.
G. Buchalla, I. Dunietz and H. Yamamoto, Phys. Lett. B364 (1995) 188.
The Four LEP Collaborations and the LEP Heavy-Flavour Electroweak Working Group, Preprint CERN-PPE/95-172.
E.J. Eichten, C.T. Hill and C. Quigg, Phys. Rev. Lett. 71 (1993) 4116; A.F. Falk and M. Luke, Phys. Lett. B292 (1992) 119.
Author information
Consortia
Rights and permissions
About this article
Cite this article
ALEPH Collaboration. Production of orbitally excited charm mesons in semileptonic B decays. Z Phys C - Particles and Fields 73, 601–612 (1997). https://doi.org/10.1007/s002880050351
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s002880050351