Measuremént of the b baryon lifetime and branching fractions in Z decays

R. Barate; D. Buskulic; D. Decamp; P. Ghez; C. Goy; J. P. Lees; A. Lucotte; M. N. Minard; J. Y. Nief; B. Pietrzyk; M. P. Casado; M. Chmeissani; P. Comas; J. M. Crespo; M. Delfino; E. Fernandez; M. Fernandez-Bosman; Ll Garrido; A. Juste; M. Martinez; G. Merino; R. Miquel; Ll M. Mir; C. Padilla; I. C. Park; A. Pascual; J. A. Perlas; I. Riu; F. Sanchez; A. Colaleo; D. Creanza; M. De Palma; G. Gelao; G. Iaselli; G. Maggi; M. Maggi; N. Marinelli; 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; R. Alemany; U. Becker; A. O. Bazarko; P. Bright-Thomas; M. Cattaneo; F. Cerutti; G. Dissertori; H. Drevermann; R. W. Forty; M. Frank; R. Hagelberg; J. B. Hansen; J. Harvey; P. Janot; B. Jost; E. Kneringer; J. Knobloch; I. Lehraus; P. Mato; A. Minten; L. Moneta; A. Pacheco; J. F. Pusztaszeri; F. Ranjard; G. Rizzo; L. Rolandi; D. Rousseau; D. Schlatter; M. Schmitt; O. Schneider; W. Tejessy; F. Teubert; I. R. Tomalin; H. Wachsmuth; A. Wagner; T. Fearnley; J. D. Hansen; J. R. Hansen; P. H. Hansen; B. S. Nilsson; B. Rensch; A. Wäänänen

doi:10.1007/s100529800837

Measuremént of the b baryon lifetime and branching fractions in Z decays

R. Barate^*, D. Buskulic, D. Decamp, P. Ghez, C. Goy, J. P. Lees, A. Lucotte, M. N. Minard, J. Y. Nief, B. Pietrzyk, M. P. Casado, M. Chmeissani, P. Comas, J. M. Crespo, M. Delfino, E. Fernandez, M. Fernandez-Bosman, Ll Garrido, A. Juste, M. MartinezG. Merino, R. Miquel, Ll M. Mir, C. Padilla, I. C. Park, A. Pascual, J. A. Perlas, I. Riu, F. Sanchez, A. Colaleo, D. Creanza, M. De Palma, G. Gelao, G. Iaselli, G. Maggi, M. Maggi, N. Marinelli, 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, R. Alemany, U. Becker, A. O. Bazarko, P. Bright-Thomas, M. Cattaneo, F. Cerutti, G. Dissertori, H. Drevermann, R. W. Forty, M. Frank, R. Hagelberg, J. B. Hansen, J. Harvey, P. Janot, B. Jost, E. Kneringer, J. Knobloch, I. Lehraus, P. Mato, A. Minten, L. Moneta, A. Pacheco, J. F. Pusztaszeri, F. Ranjard, G. Rizzo, L. Rolandi, D. Rousseau, D. Schlatter, M. Schmitt, O. Schneider, W. Tejessy, F. Teubert, I. R. Tomalin, H. Wachsmuth, A. Wagner, T. Fearnley, J. D. Hansen, J. R. Hansen, P. H. Hansen, B. S. Nilsson, B. Rensch, A. Wäänänen

^*Corresponding author for this work

Physics and Astronomy

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

29 Scopus citations

Abstract

Using approximately 4 million hadronic Ζ decays recorded with the ALEPH detector from 1991 through 1995, the lifetime of the b baryon is measured with three independent methods. From the impact parameter distribution of candidate leptons in 1063 events with Λℓ^- combinations, the average b baryon lifetime is measured to be 1.20 ± 0.08 ± 0.06 ps. From a sample of 193 fully reconstructed Λ⁺ _c candidates correlated with a lepton and a sample of 46 Λℓ⁺ℓ^- combinations, the Λ_b lifetime is measured to be 1.21 ± 0.11 ps. The product branching fractions to these final states are Br(b → Λ_bb) · Br(Λ_b → Λℓ^-v̄X) = 0.326 ± 0.016 ± 0.039% for the first sample and Br(b → Λ_b) · Br(Λ_b → Λ⁺ _cℓ^-v̄X) = 0.86 ± 0.07 ± 0.14% for the second and third samples combined.

Original language	English (US)
Pages (from-to)	197-211
Number of pages	15
Journal	European Physical Journal C
Volume	2
Issue number	2
DOIs	https://doi.org/10.1007/s100529800837
State	Published - 1998

ASJC Scopus subject areas

Engineering (miscellaneous)
Physics and Astronomy (miscellaneous)

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10.1007/s100529800837

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Barate, R., Buskulic, D., Decamp, D., Ghez, P., Goy, C., Lees, J. P., Lucotte, A., Minard, M. N., Nief, J. Y., Pietrzyk, B., Casado, M. P., Chmeissani, M., Comas, P., Crespo, J. M., Delfino, M., Fernandez, E., Fernandez-Bosman, M., Garrido, L., Juste, A., ... Wäänänen, A. (1998). Measuremént of the b baryon lifetime and branching fractions in Z decays. European Physical Journal C, 2(2), 197-211. https://doi.org/10.1007/s100529800837

@article{472a7cc9950e412f9ac608a647c46017,

title = "Measurem{\'e}nt of the b baryon lifetime and branching fractions in Z decays",

abstract = "Using approximately 4 million hadronic Ζ decays recorded with the ALEPH detector from 1991 through 1995, the lifetime of the b baryon is measured with three independent methods. From the impact parameter distribution of candidate leptons in 1063 events with Λℓ- combinations, the average b baryon lifetime is measured to be 1.20 ± 0.08 ± 0.06 ps. From a sample of 193 fully reconstructed Λ+ c candidates correlated with a lepton and a sample of 46 Λℓ+ℓ- combinations, the Λb lifetime is measured to be 1.21 ± 0.11 ps. The product branching fractions to these final states are Br(b → Λbb) · Br(Λb → Λℓ-{\=v}X) = 0.326 ± 0.016 ± 0.039% for the first sample and Br(b → Λb) · Br(Λb → Λ+ cℓ-{\=v}X) = 0.86 ± 0.07 ± 0.14% for the second and third samples combined.",

author = "R. Barate and D. Buskulic 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 B. Pietrzyk and Casado, {M. P.} and M. Chmeissani and P. Comas and Crespo, {J. M.} and M. Delfino and E. Fernandez and M. Fernandez-Bosman and Ll Garrido and A. Juste and M. Martinez and G. Merino and R. Miquel and Mir, {Ll M.} and C. Padilla and Park, {I. C.} and A. Pascual and Perlas, {J. A.} and I. Riu and F. Sanchez and A. Colaleo and D. Creanza and {De Palma}, M. and G. Gelao 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 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 R. Alemany and U. Becker and Bazarko, {A. O.} and P. Bright-Thomas and M. Cattaneo and F. Cerutti and G. Dissertori and H. Drevermann and Forty, {R. W.} and M. Frank and R. Hagelberg and Hansen, {J. B.} and J. Harvey and P. Janot and B. Jost and E. Kneringer and J. Knobloch and I. Lehraus and P. Mato and A. Minten and L. Moneta and A. Pacheco and Pusztaszeri, {J. F.} and F. Ranjard and G. Rizzo and L. Rolandi and D. Rousseau and D. Schlatter and M. Schmitt and O. Schneider and W. Tejessy and F. Teubert and Tomalin, {I. R.} and H. Wachsmuth and A. Wagner and T. Fearnley and Hansen, {J. D.} and Hansen, {J. R.} and Hansen, {P. H.} and Nilsson, {B. S.} and B. Rensch and A. W{\"a}{\"a}n{\"a}nen",

year = "1998",

doi = "10.1007/s100529800837",

language = "English (US)",

volume = "2",

pages = "197--211",

journal = "European Physical Journal C",

issn = "1434-6044",

publisher = "Springer New York",

number = "2",

}

Barate, R, Buskulic, D, Decamp, D, Ghez, P, Goy, C, Lees, JP, Lucotte, A, Minard, MN, Nief, JY, Pietrzyk, B, Casado, MP, Chmeissani, M, Comas, P, Crespo, JM, Delfino, M, Fernandez, E, Fernandez-Bosman, M, Garrido, L, Juste, A, Martinez, M, Merino, G, Miquel, R, Mir, LM, Padilla, C, Park, IC, Pascual, A, Perlas, JA, Riu, I, Sanchez, F, Colaleo, A, Creanza, D, De Palma, M, Gelao, G, Iaselli, G, Maggi, G, Maggi, M, Marinelli, N, 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, Alemany, R, Becker, U, Bazarko, AO, Bright-Thomas, P, Cattaneo, M, Cerutti, F, Dissertori, G, Drevermann, H, Forty, RW, Frank, M, Hagelberg, R, Hansen, JB, Harvey, J, Janot, P, Jost, B, Kneringer, E, Knobloch, J, Lehraus, I, Mato, P, Minten, A, Moneta, L, Pacheco, A, Pusztaszeri, JF, Ranjard, F, Rizzo, G, Rolandi, L, Rousseau, D, Schlatter, D, Schmitt, M, Schneider, O, Tejessy, W, Teubert, F, Tomalin, IR, Wachsmuth, H, Wagner, A, Fearnley, T, Hansen, JD, Hansen, JR, Hansen, PH, Nilsson, BS, Rensch, B & Wäänänen, A 1998, 'Measuremént of the b baryon lifetime and branching fractions in Z decays', European Physical Journal C, vol. 2, no. 2, pp. 197-211. https://doi.org/10.1007/s100529800837

TY - JOUR

T1 - Measuremént of the b baryon lifetime and branching fractions in Z decays

AU - Barate, R.

AU - Buskulic, D.

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 - Pietrzyk, B.

AU - Casado, M. P.

AU - Chmeissani, M.

AU - Comas, P.

AU - Crespo, J. M.

AU - Delfino, M.

AU - Fernandez, E.

AU - Fernandez-Bosman, M.

AU - Garrido, Ll

AU - Juste, A.

AU - Martinez, M.

AU - Merino, G.

AU - Miquel, R.

AU - Mir, Ll M.

AU - Padilla, C.

AU - Park, I. C.

AU - Pascual, A.

AU - Perlas, J. A.

AU - Riu, I.

AU - Sanchez, F.

AU - Colaleo, A.

AU - Creanza, D.

AU - De Palma, M.

AU - Gelao, G.

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 - 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 - Alemany, R.

AU - Becker, U.

AU - Bazarko, A. O.

AU - Bright-Thomas, P.

AU - Cattaneo, M.

AU - Cerutti, F.

AU - Dissertori, G.

AU - Drevermann, H.

AU - Forty, R. W.

AU - Frank, M.

AU - Hagelberg, R.

AU - Hansen, J. B.

AU - Harvey, J.

AU - Janot, P.

AU - Jost, B.

AU - Kneringer, E.

AU - Knobloch, J.

AU - Lehraus, I.

AU - Mato, P.

AU - Minten, A.

AU - Moneta, L.

AU - Pacheco, A.

AU - Pusztaszeri, J. F.

AU - Ranjard, F.

AU - Rizzo, G.

AU - Rolandi, L.

AU - Rousseau, D.

AU - Schlatter, D.

AU - Schmitt, M.

AU - Schneider, O.

AU - Tejessy, W.

AU - Teubert, F.

AU - Tomalin, I. R.

AU - Wachsmuth, H.

AU - Wagner, A.

AU - Fearnley, T.

AU - Hansen, J. D.

AU - Hansen, J. R.

AU - Hansen, P. H.

AU - Nilsson, B. S.

AU - Rensch, B.

AU - Wäänänen, A.

PY - 1998

Y1 - 1998

N2 - Using approximately 4 million hadronic Ζ decays recorded with the ALEPH detector from 1991 through 1995, the lifetime of the b baryon is measured with three independent methods. From the impact parameter distribution of candidate leptons in 1063 events with Λℓ- combinations, the average b baryon lifetime is measured to be 1.20 ± 0.08 ± 0.06 ps. From a sample of 193 fully reconstructed Λ+ c candidates correlated with a lepton and a sample of 46 Λℓ+ℓ- combinations, the Λb lifetime is measured to be 1.21 ± 0.11 ps. The product branching fractions to these final states are Br(b → Λbb) · Br(Λb → Λℓ-v̄X) = 0.326 ± 0.016 ± 0.039% for the first sample and Br(b → Λb) · Br(Λb → Λ+ cℓ-v̄X) = 0.86 ± 0.07 ± 0.14% for the second and third samples combined.

AB - Using approximately 4 million hadronic Ζ decays recorded with the ALEPH detector from 1991 through 1995, the lifetime of the b baryon is measured with three independent methods. From the impact parameter distribution of candidate leptons in 1063 events with Λℓ- combinations, the average b baryon lifetime is measured to be 1.20 ± 0.08 ± 0.06 ps. From a sample of 193 fully reconstructed Λ+ c candidates correlated with a lepton and a sample of 46 Λℓ+ℓ- combinations, the Λb lifetime is measured to be 1.21 ± 0.11 ps. The product branching fractions to these final states are Br(b → Λbb) · Br(Λb → Λℓ-v̄X) = 0.326 ± 0.016 ± 0.039% for the first sample and Br(b → Λb) · Br(Λb → Λ+ cℓ-v̄X) = 0.86 ± 0.07 ± 0.14% for the second and third samples combined.

UR - http://www.scopus.com/inward/record.url?scp=0032437788&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0032437788&partnerID=8YFLogxK

U2 - 10.1007/s100529800837

DO - 10.1007/s100529800837

M3 - Article

AN - SCOPUS:0032437788

SN - 1434-6044

VL - 2

SP - 197

EP - 211

JO - European Physical Journal C

JF - European Physical Journal C

IS - 2

ER -

Measuremént of the b baryon lifetime and branching fractions in Z decays

Abstract

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