Strange b baryon production and lifetime in Z decays

D. Buskulic; I. de Bonis; D. Decamp; P. Ghez; C. Goy; J. P. Lees; A. Lucotte; M. N. Minard; J. Y. Nief; P. Odier; B. Pietrzyk; M. P. Casado; M. Chmeissani; J. M. Crespo; M. Delfino; I. Efthymiopoulos; E. Fernandez; M. Fernandez-Bosman; LI Garrido; A. Juste; M. Martinez; S. Orteu; C. Padilla; I. C. Park; A. Pascual; J. A. Perlas; I. Riu; F. Sanchez; F. Teubert; A. Colaleo; D. Creanza; M. de Palma; G. Gelao; M. Girone; G. Iaselli; G. Maggi; M. Maggi; N. Marinelli; S. Nuzzo; A. Ranieri; G. Raso; F. Ruggieri; G. Selvaggi; L. Silvestris; P. Tempesta; G. Zito; X. Huang; J. Lin; Q. Ouyang; T. Wang; Y. Xie; R. Xu; S. Xue; J. Zhang; L. Zhang; W. Zhao; R. Alemany; A. O. Bazarko; G. Bonvicini; M. Cattaneo; P. Comas; P. Coyle; H. Drevermann; R. W. Forty; M. Frank; R. Hagelberg; J. Harvey; P. Janot; B. Jost; E. Kneringer; J. Knobloch; I. Lehraus; G. Lutters; E. B. Martin; P. Mato; A. Minten; R. Miquel; L. M. Mir; L. Moneta; T. Oest; A. Pacheco; J. F. Pusztaszeri; F. Ranjard; P. Rensing; L. Rolandi; D. Schlatter; M. Schmelling; M. Schmitt; O. Schneider; W. Tejessy; I. R. Tomalin; A. Venturi; H. Wachsmuth; A. Wagner; Z. Ajaltouni; A. Barrès; C. Boyer; A. Falvard; P. Gay; C. Guicheney

doi:10.1016/0370-2693(96)00925-2

Strange b baryon production and lifetime in Z decays

D. Buskulic, I. de Bonis, D. Decamp, P. Ghez, C. Goy, J. P. Lees, A. Lucotte, M. N. Minard, J. Y. Nief, P. Odier, B. Pietrzyk, M. P. Casado, M. Chmeissani, J. M. Crespo, M. Delfino, I. Efthymiopoulos, E. Fernandez, M. Fernandez-Bosman, LI Garrido, A. JusteM. Martinez, S. Orteu, C. Padilla, I. C. Park, A. Pascual, J. A. Perlas, I. Riu, F. Sanchez, F. Teubert, A. Colaleo, D. Creanza, M. de Palma, G. Gelao, M. Girone, G. Iaselli, G. Maggi, M. Maggi, N. Marinelli, S. Nuzzo, A. Ranieri, G. Raso, F. Ruggieri, G. Selvaggi, L. Silvestris, P. Tempesta, G. Zito, X. Huang, J. Lin, Q. Ouyang, T. Wang, Y. Xie, R. Xu, S. Xue, J. Zhang, L. Zhang, W. Zhao, R. Alemany, A. O. Bazarko, G. Bonvicini, M. Cattaneo, P. Comas, P. Coyle, H. Drevermann, R. W. Forty, M. Frank, R. Hagelberg, J. Harvey, P. Janot, B. Jost, E. Kneringer, J. Knobloch, I. Lehraus, G. Lutters, E. B. Martin, P. Mato, A. Minten, R. Miquel, L. M. Mir, L. Moneta, T. Oest, A. Pacheco, J. F. Pusztaszeri, F. Ranjard, P. Rensing, L. Rolandi, D. Schlatter, M. Schmelling, M. Schmitt, O. Schneider, W. Tejessy, I. R. Tomalin, A. Venturi, H. Wachsmuth, A. Wagner, Z. Ajaltouni, A. Barrès, C. Boyer, A. Falvard, P. Gay, C. Guicheney

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Abstract

In a data sample of approximately four million hadronic Z decays recorded with the ALEPH detector from 1990 to 1995, a search for the strange b baryon Ξb is performed with a study of Ξ-lepton correlations. Forty-four events with same sign Ξ-ℓ- combinations are found whereas 8.4 are expected based on the rate of opposite sign Ξ-ℓ+ combinations. This significant excess is interpreted as evidence for Ξb semileptonic decays. The measured product branching ratio is Br(b → Ξb) × Br(Ξb → ΧcΧℓ-νl) × Br(XΧc → Ξ-Χ′) = (5.4±1.1(stat)±0.8(syst)) × 10-4 per lepton species, averaged over electrons and muons, with Χc a charmed baryon. The Ξb lifetime is measured to be τΞb = 1.35-0.28+0.37 (stat) 0.17+0.15 (syst) ps.

Original language	English
Pages (from-to)	449-460
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	384
Issue number	1-4
DOIs	https://doi.org/10.1016/0370-2693(96)00925-2
Publication status	Published - 19 Sept 1996

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10.1016/0370-2693(96)00925-2

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Buskulic, D., de Bonis, I., Decamp, D., Ghez, P., Goy, C., Lees, J. P., Lucotte, A., Minard, M. N., Nief, J. Y., Odier, P., Pietrzyk, B., Casado, M. P., Chmeissani, M., Crespo, J. M., Delfino, M., Efthymiopoulos, I., Fernandez, E., Fernandez-Bosman, M., Garrido, LI., ... Guicheney, C. (1996). Strange b baryon production and lifetime in Z decays. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 384(1-4), 449-460. https://doi.org/10.1016/0370-2693(96)00925-2

@article{a72dba795091423f9bed1750faf80cee,

title = "Strange b baryon production and lifetime in Z decays",

abstract = "In a data sample of approximately four million hadronic Z decays recorded with the ALEPH detector from 1990 to 1995, a search for the strange b baryon Ξb is performed with a study of Ξ-lepton correlations. Forty-four events with same sign Ξ-ℓ- combinations are found whereas 8.4 are expected based on the rate of opposite sign Ξ-ℓ+ combinations. This significant excess is interpreted as evidence for Ξb semileptonic decays. The measured product branching ratio is Br(b → Ξb) × Br(Ξb → ΧcΧℓ-νl) × Br(XΧc → Ξ-Χ′) = (5.4±1.1(stat)±0.8(syst)) × 10-4 per lepton species, averaged over electrons and muons, with Χc a charmed baryon. The Ξb lifetime is measured to be τΞb = 1.35-0.28+0.37 (stat) 0.17+0.15 (syst) ps.",

author = "D. Buskulic and {de Bonis}, I. and D. Decamp and P. Ghez and C. Goy and Lees, {J. P.} and A. Lucotte and Minard, {M. N.} and Nief, {J. Y.} and P. Odier and B. Pietrzyk and Casado, {M. P.} and M. Chmeissani and Crespo, {J. M.} and M. Delfino and I. Efthymiopoulos and E. Fernandez and M. Fernandez-Bosman and LI Garrido and A. Juste and M. Martinez and S. Orteu and C. Padilla and Park, {I. C.} and A. Pascual and Perlas, {J. A.} and I. Riu and F. Sanchez and F. Teubert and A. Colaleo and D. Creanza and {de Palma}, M. and G. Gelao and M. Girone and G. Iaselli and G. Maggi and M. Maggi and N. Marinelli and S. Nuzzo and A. Ranieri and G. Raso and F. Ruggieri and G. Selvaggi and L. Silvestris and P. Tempesta 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 R. Alemany and Bazarko, {A. O.} and G. Bonvicini and M. Cattaneo and P. Comas and P. Coyle and H. Drevermann and Forty, {R. W.} and M. Frank and R. Hagelberg and J. Harvey and P. Janot and B. Jost and E. Kneringer and J. Knobloch and I. Lehraus and G. Lutters and Martin, {E. B.} and P. Mato and A. Minten and R. Miquel and Mir, {L. M.} and L. Moneta and T. Oest and A. Pacheco and Pusztaszeri, {J. F.} and F. Ranjard and P. Rensing and L. Rolandi and D. Schlatter and M. Schmelling and M. Schmitt and O. Schneider and W. Tejessy and Tomalin, {I. R.} and A. Venturi and H. Wachsmuth and A. Wagner and Z. Ajaltouni and A. Barr{\`e}s and C. Boyer and A. Falvard and P. Gay and C. Guicheney",

year = "1996",

month = sep,

day = "19",

doi = "10.1016/0370-2693(96)00925-2",

language = "English",

volume = "384",

pages = "449--460",

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

issn = "0370-2693",

publisher = "Elsevier",

number = "1-4",

}

Buskulic, D, de Bonis, I, Decamp, D, Ghez, P, Goy, C, Lees, JP, Lucotte, A, Minard, MN, Nief, JY, Odier, P, Pietrzyk, B, Casado, MP, Chmeissani, M, Crespo, JM , Delfino, M, Efthymiopoulos, I, Fernandez, E, Fernandez-Bosman, M, Garrido, LI, Juste, A, Martinez, M, Orteu, S, Padilla, C, Park, IC, Pascual, A, Perlas, JA, Riu, I, Sanchez, F, Teubert, F, Colaleo, A, Creanza, D, de Palma, M, Gelao, G, Girone, M, Iaselli, G, Maggi, G, Maggi, M, Marinelli, N, Nuzzo, S, Ranieri, A, Raso, G, Ruggieri, F, Selvaggi, G, Silvestris, L, Tempesta, P, Zito, G, Huang, X, Lin, J, Ouyang, Q, Wang, T, Xie, Y, Xu, R, Xue, S, Zhang, J, Zhang, L, Zhao, W, Alemany, R, Bazarko, AO, Bonvicini, G, Cattaneo, M, Comas, P, Coyle, P, Drevermann, H, Forty, RW, Frank, M, Hagelberg, R, Harvey, J, Janot, P, Jost, B, Kneringer, E, Knobloch, J, Lehraus, I, Lutters, G, Martin, EB, Mato, P, Minten, A, Miquel, R, Mir, LM, Moneta, L, Oest, T, Pacheco, A, Pusztaszeri, JF, Ranjard, F, Rensing, P, Rolandi, L, Schlatter, D, Schmelling, M, Schmitt, M, Schneider, O, Tejessy, W, Tomalin, IR, Venturi, A, Wachsmuth, H, Wagner, A, Ajaltouni, Z, Barrès, A, Boyer, C, Falvard, A, Gay, P & Guicheney, C 1996, 'Strange b baryon production and lifetime in Z decays', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 384, no. 1-4, pp. 449-460. https://doi.org/10.1016/0370-2693(96)00925-2

TY - JOUR

T1 - Strange b baryon production and lifetime in Z decays

AU - Buskulic, D.

AU - de Bonis, I.

AU - Decamp, D.

AU - Ghez, P.

AU - Goy, C.

AU - Lees, J. P.

AU - Lucotte, A.

AU - Minard, M. N.

AU - Nief, J. Y.

AU - Odier, P.

AU - Pietrzyk, B.

AU - Casado, M. P.

AU - Chmeissani, M.

AU - Crespo, J. M.

AU - Delfino, M.

AU - Efthymiopoulos, I.

AU - Fernandez, E.

AU - Fernandez-Bosman, M.

AU - Garrido, LI

AU - Juste, A.

AU - Martinez, M.

AU - Orteu, S.

AU - Padilla, C.

AU - Park, I. C.

AU - Pascual, A.

AU - Perlas, J. A.

AU - Riu, I.

AU - Sanchez, F.

AU - Teubert, F.

AU - Colaleo, A.

AU - Creanza, D.

AU - de Palma, M.

AU - Gelao, G.

AU - Girone, M.

AU - Iaselli, G.

AU - Maggi, G.

AU - Maggi, M.

AU - Marinelli, N.

AU - Nuzzo, S.

AU - Ranieri, A.

AU - Raso, G.

AU - Ruggieri, F.

AU - Selvaggi, G.

AU - Silvestris, L.

AU - Tempesta, P.

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 - Alemany, R.

AU - Bazarko, A. O.

AU - Bonvicini, G.

AU - Cattaneo, M.

AU - Comas, P.

AU - Coyle, P.

AU - Drevermann, H.

AU - Forty, R. W.

AU - Frank, M.

AU - Hagelberg, R.

AU - Harvey, J.

AU - Janot, P.

AU - Jost, B.

AU - Kneringer, E.

AU - Knobloch, J.

AU - Lehraus, I.

AU - Lutters, G.

AU - Martin, E. B.

AU - Mato, P.

AU - Minten, A.

AU - Miquel, R.

AU - Mir, L. M.

AU - Moneta, L.

AU - Oest, T.

AU - Pacheco, A.

AU - Pusztaszeri, J. F.

AU - Ranjard, F.

AU - Rensing, P.

AU - Rolandi, L.

AU - Schlatter, D.

AU - Schmelling, M.

AU - Schmitt, M.

AU - Schneider, O.

AU - Tejessy, W.

AU - Tomalin, I. R.

AU - Venturi, A.

AU - Wachsmuth, H.

AU - Wagner, A.

AU - Ajaltouni, Z.

AU - Barrès, A.

AU - Boyer, C.

AU - Falvard, A.

AU - Gay, P.

AU - Guicheney, C.

PY - 1996/9/19

Y1 - 1996/9/19

N2 - In a data sample of approximately four million hadronic Z decays recorded with the ALEPH detector from 1990 to 1995, a search for the strange b baryon Ξb is performed with a study of Ξ-lepton correlations. Forty-four events with same sign Ξ-ℓ- combinations are found whereas 8.4 are expected based on the rate of opposite sign Ξ-ℓ+ combinations. This significant excess is interpreted as evidence for Ξb semileptonic decays. The measured product branching ratio is Br(b → Ξb) × Br(Ξb → ΧcΧℓ-νl) × Br(XΧc → Ξ-Χ′) = (5.4±1.1(stat)±0.8(syst)) × 10-4 per lepton species, averaged over electrons and muons, with Χc a charmed baryon. The Ξb lifetime is measured to be τΞb = 1.35-0.28+0.37 (stat) 0.17+0.15 (syst) ps.

AB - In a data sample of approximately four million hadronic Z decays recorded with the ALEPH detector from 1990 to 1995, a search for the strange b baryon Ξb is performed with a study of Ξ-lepton correlations. Forty-four events with same sign Ξ-ℓ- combinations are found whereas 8.4 are expected based on the rate of opposite sign Ξ-ℓ+ combinations. This significant excess is interpreted as evidence for Ξb semileptonic decays. The measured product branching ratio is Br(b → Ξb) × Br(Ξb → ΧcΧℓ-νl) × Br(XΧc → Ξ-Χ′) = (5.4±1.1(stat)±0.8(syst)) × 10-4 per lepton species, averaged over electrons and muons, with Χc a charmed baryon. The Ξb lifetime is measured to be τΞb = 1.35-0.28+0.37 (stat) 0.17+0.15 (syst) ps.

U2 - 10.1016/0370-2693(96)00925-2

DO - 10.1016/0370-2693(96)00925-2

M3 - Article

SN - 0370-2693

VL - 384

SP - 449

EP - 460

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 - 1-4

ER -

Strange b baryon production and lifetime in Z decays

Abstract

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