Determination of |V(ub)|/|V(cb)| with DELPHI at LEP

Christopher Parkes; R. Barate; D. Decamp; P. Ghez; C. Goy; S. Jezequel; J. P. Lees; F. Martin; E. Merle; M. N. Minard; B. Pietrzyk; R. Alemany; S. Bravo; M. P. Casado; M. Chmeissani; J. M. Crespo; E. Fernandez; M. Fernandez-Bosman; Ll Garrido; E. Graugés; A. Juste; M. Martinez; G. Merino; R. Miquel; Ll M. Mir; P. Morawitz; A. Pacheco; I. Riu; H. Ruiz; A. Colaleo; D. Creanza; M. De Palma; G. Iaselli; G. Maggi; M. Maggi; S. Nuzzo; A. Ranieri; G. Raso; F. Ruggieri; G. Selvaggi; L. Silvestris; P. Tempesta; A. Tricomi; G. Zito; X. Huang; J. Lin; Q. Ouyang; T. Wang; Y. Xie; R. Xu; S. Xue; J. Zhang; L. Zhang; W. Zhao; D. Abbaneo; G. Boix; O. Buchmüller; M. Cattaneo; F. Cerutti; V. Ciulli

doi:10.1016/S0370-2693(00)00281-1

Determination of |V(ub)|/|V(cb)| with DELPHI at LEP

Christopher Parkes
, R. Barate
, D. Decamp
, P. Ghez
, C. Goy
, S. Jezequel
, J. P. Lees
, F. Martin
, E. Merle
, M. N. Minard
, B. Pietrzyk
, R. Alemany
, S. Bravo
, M. P. Casado
, M. Chmeissani
, J. M. Crespo
, E. Fernandez
, M. Fernandez-Bosman
, Ll Garrido
, E. Graugés

A. Juste, M. Martinez, G. Merino, R. Miquel, Ll M. Mir, P. Morawitz, A. Pacheco, I. Riu, H. Ruiz, A. Colaleo, D. Creanza, M. De Palma, G. Iaselli, G. Maggi, M. Maggi, S. Nuzzo, A. Ranieri, G. Raso, F. Ruggieri, G. Selvaggi, L. Silvestris, P. Tempesta, A. Tricomi, G. Zito, X. Huang, J. Lin, Q. Ouyang, T. Wang, Y. Xie, R. Xu, S. Xue, J. Zhang, L. Zhang, W. Zhao, D. Abbaneo, G. Boix, O. Buchmüller, M. Cattaneo, F. Cerutti, V. Ciulli

Research output: Contribution to journal › Article › peer-review

Abstract

The ratio of the CKM quark-mixing matrix elements |V(ub)|/|V(cb)| has been measured using B hadron semileptonic decays. The analysis uses the reconstructed mass M(x) of the secondary hadronic system produced in association with an identified lepton. Since B → X(u)lv̄ transitions are characterised by hadronic masses below those of the D mesons produced in B → X(c)lv̄ transitions, events with a reconstructed value of M(x) significantly below the D mass are selected. Further signal enrichments are obtained using the topology of reconstructed decays and hadron identification. A fit to the numbers of decays in the b → u enriched and depleted samples with M(x) above and below 1.6 GeV/c2 and to the shapes of the lepton energy distribution in the B rest frame gives |V(ub)|/|V(cb)| = 0.103 (-0.012)/(+0.011)(stat.) ± 0.016(syst.) ± 0.010(model) and, correspondingly, a charmless semileptonic B decay branching fraction of BR(B → X(u)lv̄= (1.57 ± 0.35 (stat.) ± 0.48 (syst.) ± 0.27 (model)) x 10-3. (C) 2000 Published by Elsevier Science B.V.

Original language	English
Pages (from-to)	14-30
Number of pages	16
Journal	Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	478
Issue number	1-3
DOIs	https://doi.org/10.1016/S0370-2693(00)00281-1
Publication status	Published - 6 Apr 2000

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10.1016/S0370-2693(00)00281-1

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Parkes, C., Barate, R., Decamp, D., Ghez, P., Goy, C., Jezequel, S., Lees, J. P., Martin, F., Merle, E., Minard, M. N., Pietrzyk, B., Alemany, R., Bravo, S., Casado, M. P., Chmeissani, M., Crespo, J. M., Fernandez, E., Fernandez-Bosman, M., Garrido, L., ... Ciulli, V. (2000). Determination of |V(ub)|/|V(cb)| with DELPHI at LEP. Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics, 478(1-3), 14-30. https://doi.org/10.1016/S0370-2693(00)00281-1

@article{db193b9825ed40428c32d8a9a8bd78c6,

title = "Determination of |V(ub)|/|V(cb)| with DELPHI at LEP",

abstract = "The ratio of the CKM quark-mixing matrix elements |V(ub)|/|V(cb)| has been measured using B hadron semileptonic decays. The analysis uses the reconstructed mass M(x) of the secondary hadronic system produced in association with an identified lepton. Since B → X(u)l{\=v} transitions are characterised by hadronic masses below those of the D mesons produced in B → X(c)l{\=v} transitions, events with a reconstructed value of M(x) significantly below the D mass are selected. Further signal enrichments are obtained using the topology of reconstructed decays and hadron identification. A fit to the numbers of decays in the b → u enriched and depleted samples with M(x) above and below 1.6 GeV/c2 and to the shapes of the lepton energy distribution in the B rest frame gives |V(ub)|/|V(cb)| = 0.103 (-0.012)/(+0.011)(stat.) ± 0.016(syst.) ± 0.010(model) and, correspondingly, a charmless semileptonic B decay branching fraction of BR(B → X(u)l{\=v}= (1.57 ± 0.35 (stat.) ± 0.48 (syst.) ± 0.27 (model)) x 10-3. (C) 2000 Published by Elsevier Science B.V.",

author = "Christopher Parkes and R. Barate and D. Decamp and P. Ghez and C. Goy and S. Jezequel and Lees, \{J. P.\} and F. Martin and E. Merle and Minard, \{M. N.\} and B. Pietrzyk and R. Alemany and S. Bravo and Casado, \{M. P.\} and M. Chmeissani and Crespo, \{J. M.\} and E. Fernandez and M. Fernandez-Bosman and Ll Garrido and E. Graug{\'e}s and A. Juste and M. Martinez and G. Merino and R. Miquel and Mir, \{Ll M.\} and P. Morawitz and A. Pacheco and I. Riu and H. Ruiz and A. Colaleo and D. Creanza and \{De Palma\}, M. and G. Iaselli and G. Maggi and M. Maggi and S. Nuzzo and A. Ranieri and G. Raso and F. Ruggieri and G. Selvaggi and L. Silvestris and P. Tempesta and A. Tricomi and G. Zito and X. Huang and J. Lin and Q. Ouyang and T. Wang and Y. Xie and R. Xu and S. Xue and J. Zhang and L. Zhang and W. Zhao and D. Abbaneo and G. Boix and O. Buchm{\"u}ller and M. Cattaneo and F. Cerutti and V. Ciulli",

year = "2000",

month = apr,

day = "6",

doi = "10.1016/S0370-2693(00)00281-1",

language = "English",

volume = "478",

pages = "14--30",

journal = "Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier BV",

number = "1-3",

}

Parkes, C, Barate, R, Decamp, D, Ghez, P, Goy, C, Jezequel, S, Lees, JP, Martin, F, Merle, E, Minard, MN, Pietrzyk, B, Alemany, R, Bravo, S, Casado, MP, Chmeissani, M, Crespo, JM, Fernandez, E, Fernandez-Bosman, M, Garrido, L, Graugés, E, Juste, A, Martinez, M, Merino, G, Miquel, R, Mir, LM, Morawitz, P, Pacheco, A, Riu, I, Ruiz, H, Colaleo, A, Creanza, D, De Palma, M, Iaselli, G, Maggi, G, Maggi, M, Nuzzo, S, Ranieri, A, Raso, G, Ruggieri, F, Selvaggi, G, Silvestris, L, Tempesta, P, Tricomi, A, Zito, G, Huang, X, Lin, J, Ouyang, Q, Wang, T, Xie, Y, Xu, R, Xue, S, Zhang, J, Zhang, L, Zhao, W, Abbaneo, D, Boix, G, Buchmüller, O, Cattaneo, M, Cerutti, F & Ciulli, V 2000, 'Determination of |V(ub)|/|V(cb)| with DELPHI at LEP', Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 478, no. 1-3, pp. 14-30. https://doi.org/10.1016/S0370-2693(00)00281-1

TY - JOUR

T1 - Determination of |V(ub)|/|V(cb)| with DELPHI at LEP

AU - Parkes, Christopher

AU - Barate, R.

AU - Decamp, D.

AU - Ghez, P.

AU - Goy, C.

AU - Jezequel, S.

AU - Lees, J. P.

AU - Martin, F.

AU - Merle, E.

AU - Minard, M. N.

AU - Pietrzyk, B.

AU - Alemany, R.

AU - Bravo, S.

AU - Casado, M. P.

AU - Chmeissani, M.

AU - Crespo, J. M.

AU - Fernandez, E.

AU - Fernandez-Bosman, M.

AU - Garrido, Ll

AU - Graugés, E.

AU - Juste, A.

AU - Martinez, M.

AU - Merino, G.

AU - Miquel, R.

AU - Mir, Ll M.

AU - Morawitz, P.

AU - Pacheco, A.

AU - Riu, I.

AU - Ruiz, H.

AU - Colaleo, A.

AU - Creanza, D.

AU - De Palma, M.

AU - Iaselli, G.

AU - Maggi, G.

AU - Maggi, M.

AU - Nuzzo, S.

AU - Ranieri, A.

AU - Raso, G.

AU - Ruggieri, F.

AU - Selvaggi, G.

AU - Silvestris, L.

AU - Tempesta, P.

AU - Tricomi, A.

AU - Zito, G.

AU - Huang, X.

AU - Lin, J.

AU - Ouyang, Q.

AU - Wang, T.

AU - Xie, Y.

AU - Xu, R.

AU - Xue, S.

AU - Zhang, J.

AU - Zhang, L.

AU - Zhao, W.

AU - Abbaneo, D.

AU - Boix, G.

AU - Buchmüller, O.

AU - Cattaneo, M.

AU - Cerutti, F.

AU - Ciulli, V.

PY - 2000/4/6

Y1 - 2000/4/6

N2 - The ratio of the CKM quark-mixing matrix elements |V(ub)|/|V(cb)| has been measured using B hadron semileptonic decays. The analysis uses the reconstructed mass M(x) of the secondary hadronic system produced in association with an identified lepton. Since B → X(u)lv̄ transitions are characterised by hadronic masses below those of the D mesons produced in B → X(c)lv̄ transitions, events with a reconstructed value of M(x) significantly below the D mass are selected. Further signal enrichments are obtained using the topology of reconstructed decays and hadron identification. A fit to the numbers of decays in the b → u enriched and depleted samples with M(x) above and below 1.6 GeV/c2 and to the shapes of the lepton energy distribution in the B rest frame gives |V(ub)|/|V(cb)| = 0.103 (-0.012)/(+0.011)(stat.) ± 0.016(syst.) ± 0.010(model) and, correspondingly, a charmless semileptonic B decay branching fraction of BR(B → X(u)lv̄= (1.57 ± 0.35 (stat.) ± 0.48 (syst.) ± 0.27 (model)) x 10-3. (C) 2000 Published by Elsevier Science B.V.

AB - The ratio of the CKM quark-mixing matrix elements |V(ub)|/|V(cb)| has been measured using B hadron semileptonic decays. The analysis uses the reconstructed mass M(x) of the secondary hadronic system produced in association with an identified lepton. Since B → X(u)lv̄ transitions are characterised by hadronic masses below those of the D mesons produced in B → X(c)lv̄ transitions, events with a reconstructed value of M(x) significantly below the D mass are selected. Further signal enrichments are obtained using the topology of reconstructed decays and hadron identification. A fit to the numbers of decays in the b → u enriched and depleted samples with M(x) above and below 1.6 GeV/c2 and to the shapes of the lepton energy distribution in the B rest frame gives |V(ub)|/|V(cb)| = 0.103 (-0.012)/(+0.011)(stat.) ± 0.016(syst.) ± 0.010(model) and, correspondingly, a charmless semileptonic B decay branching fraction of BR(B → X(u)lv̄= (1.57 ± 0.35 (stat.) ± 0.48 (syst.) ± 0.27 (model)) x 10-3. (C) 2000 Published by Elsevier Science B.V.

U2 - 10.1016/S0370-2693(00)00281-1

DO - 10.1016/S0370-2693(00)00281-1

M3 - Article

SN - 0370-2693

VL - 478

SP - 14

EP - 30

JO - Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics

IS - 1-3

ER -

Determination of |V(ub)|/|V(cb)| with DELPHI at LEP

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