Measurement of heavy quark forward-backward asymmetries and average B mixing using leptons in multihadronic events

The OPAL Collaboration

doi:10.1007/s002880050114

Measurement of heavy quark forward-backward asymmetries and average B mixing using leptons in multihadronic events

The OPAL Collaboration

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

47 Citations (Scopus)

Abstract

A measurement of the forward-backward asymmetries of e⁺e^-→Z⁰→bb and e⁺e^-->Z°→cc̄ using electrons and muons produced in semileptonic decays of bottom and charm hadrons is presented. Two new variables designed to optimize flavour separation are used in a maximum likelihood fit to a sample of events containing one or two identified leptons, allowing the simultaneous extraction of the b and c quark forward-backward asymmetries as well as the average B°-B° mixing. Using all data collected by OPAL up to the end of 1994, the asymmetries are measured to be: A_FB ^b = ( 5.5±2.4 ±0.3 )% A_FB ^b = (-7.5±3.4 ±0.6 )% at (√s) = 89.52 GeV, A_FB ^b = (9.06±0.51±0.23)% A_FB ^b= ( 6.00±0.67±0.52)7c at (√s) = 91.24 GeV, A_FB ^b =(11.7±2.0 ±0.3 )% A_FB ^b =( 14.l±2.8 ±0.9 )% at (√s) = 92.94 GeV. For the average B°-B° mixing a value of: X = 0.1107 ±0.0062 ±0.0055, is obtained, where in each case the first error is statistical and the second systematic.

Original language	English
Pages (from-to)	357-369
Number of pages	13
Journal	Zeitschrift fur Physik C-Particles and Fields
Volume	70
Issue number	3
DOIs	https://doi.org/10.1007/s002880050114
Publication status	Published - 1996
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1007/s002880050114

Cite this

@article{29b82f8147dd476dabadbd0e0de50ef2,

title = "Measurement of heavy quark forward-backward asymmetries and average B mixing using leptons in multihadronic events",

abstract = "A measurement of the forward-backward asymmetries of e+e-→Z0→bb and e+e-->Z°→c{\=c} using electrons and muons produced in semileptonic decays of bottom and charm hadrons is presented. Two new variables designed to optimize flavour separation are used in a maximum likelihood fit to a sample of events containing one or two identified leptons, allowing the simultaneous extraction of the b and c quark forward-backward asymmetries as well as the average B°-B° mixing. Using all data collected by OPAL up to the end of 1994, the asymmetries are measured to be: AFB b = ( 5.5±2.4 ±0.3 )% AFB b = (-7.5±3.4 ±0.6 )% at (√s) = 89.52 GeV, AFB b = (9.06±0.51±0.23)% AFB b= ( 6.00±0.67±0.52)7c at (√s) = 91.24 GeV, AFB b =(11.7±2.0 ±0.3 )% AFB b =( 14.l±2.8 ±0.9 )% at (√s) = 92.94 GeV. For the average B°-B° mixing a value of: X = 0.1107 ±0.0062 ±0.0055, is obtained, where in each case the first error is statistical and the second systematic.",

author = "{The OPAL Collaboration} and G. Alexander and J. Allison and N. Altekamp and K. Ametewee and Anderson, {K. J.} and S. Anderson and S. Arcelli and S. Asai and D. Axen and G. Azuelos and Ball, {A. H.} and E. Barberio and Barlow, {R. J.} and R. Bartoldus and Batley, {J. R.} and G. Beaudoin and J. Bechtluft and Beck, {G. A.} and C. Beeston and T. Behnke and Bell, {A. N.} and Bell, {K. W.} and G. Bella and S. Bentvelsen and P. Berlich and S. Bethke and O. Biebel and Bloodworth, {I. J.} and Bloomer, {J. E.} and P. Bock and Bosch, {H. M.} and M. Boutemeur and Bouwens, {B. T.} and S. Braibant and P. Bright-Thomas and Brown, {R. M.} and Burckhart, {H. J.} and C. Burgard and R. Burgin and P. Capiluppi and Carnegie, {R. K.} and Carter, {A. A.} and Carter, {J. R.} and Chang, {C. Y.} and C. Charlesworth and Charlton, {D. G.} and D. Chrisman and Chu, {S. L.} and Clarke, {P. E.L.} and S. Komamiya",

year = "1996",

doi = "10.1007/s002880050114",

language = "English",

volume = "70",

pages = "357--369",

journal = "European Physical Journal C",

issn = "1434-6044",

publisher = "Springer New York",

number = "3",

}

TY - JOUR

T1 - Measurement of heavy quark forward-backward asymmetries and average B mixing using leptons in multihadronic events

AU - The OPAL Collaboration

AU - Alexander, G.

AU - Allison, J.

AU - Altekamp, N.

AU - Ametewee, K.

AU - Anderson, K. J.

AU - Anderson, S.

AU - Arcelli, S.

AU - Asai, S.

AU - Axen, D.

AU - Azuelos, G.

AU - Ball, A. H.

AU - Barberio, E.

AU - Barlow, R. J.

AU - Bartoldus, R.

AU - Batley, J. R.

AU - Beaudoin, G.

AU - Bechtluft, J.

AU - Beck, G. A.

AU - Beeston, C.

AU - Behnke, T.

AU - Bell, A. N.

AU - Bell, K. W.

AU - Bella, G.

AU - Bentvelsen, S.

AU - Berlich, P.

AU - Bethke, S.

AU - Biebel, O.

AU - Bloodworth, I. J.

AU - Bloomer, J. E.

AU - Bock, P.

AU - Bosch, H. M.

AU - Boutemeur, M.

AU - Bouwens, B. T.

AU - Braibant, S.

AU - Bright-Thomas, P.

AU - Brown, R. M.

AU - Burckhart, H. J.

AU - Burgard, C.

AU - Burgin, R.

AU - Capiluppi, P.

AU - Carnegie, R. K.

AU - Carter, A. A.

AU - Carter, J. R.

AU - Chang, C. Y.

AU - Charlesworth, C.

AU - Charlton, D. G.

AU - Chrisman, D.

AU - Chu, S. L.

AU - Clarke, P. E.L.

AU - Komamiya, S.

PY - 1996

Y1 - 1996

N2 - A measurement of the forward-backward asymmetries of e+e-→Z0→bb and e+e-->Z°→cc̄ using electrons and muons produced in semileptonic decays of bottom and charm hadrons is presented. Two new variables designed to optimize flavour separation are used in a maximum likelihood fit to a sample of events containing one or two identified leptons, allowing the simultaneous extraction of the b and c quark forward-backward asymmetries as well as the average B°-B° mixing. Using all data collected by OPAL up to the end of 1994, the asymmetries are measured to be: AFB b = ( 5.5±2.4 ±0.3 )% AFB b = (-7.5±3.4 ±0.6 )% at (√s) = 89.52 GeV, AFB b = (9.06±0.51±0.23)% AFB b= ( 6.00±0.67±0.52)7c at (√s) = 91.24 GeV, AFB b =(11.7±2.0 ±0.3 )% AFB b =( 14.l±2.8 ±0.9 )% at (√s) = 92.94 GeV. For the average B°-B° mixing a value of: X = 0.1107 ±0.0062 ±0.0055, is obtained, where in each case the first error is statistical and the second systematic.

AB - A measurement of the forward-backward asymmetries of e+e-→Z0→bb and e+e-->Z°→cc̄ using electrons and muons produced in semileptonic decays of bottom and charm hadrons is presented. Two new variables designed to optimize flavour separation are used in a maximum likelihood fit to a sample of events containing one or two identified leptons, allowing the simultaneous extraction of the b and c quark forward-backward asymmetries as well as the average B°-B° mixing. Using all data collected by OPAL up to the end of 1994, the asymmetries are measured to be: AFB b = ( 5.5±2.4 ±0.3 )% AFB b = (-7.5±3.4 ±0.6 )% at (√s) = 89.52 GeV, AFB b = (9.06±0.51±0.23)% AFB b= ( 6.00±0.67±0.52)7c at (√s) = 91.24 GeV, AFB b =(11.7±2.0 ±0.3 )% AFB b =( 14.l±2.8 ±0.9 )% at (√s) = 92.94 GeV. For the average B°-B° mixing a value of: X = 0.1107 ±0.0062 ±0.0055, is obtained, where in each case the first error is statistical and the second systematic.

UR - http://www.scopus.com/inward/record.url?scp=0000257126&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0000257126&partnerID=8YFLogxK

U2 - 10.1007/s002880050114

DO - 10.1007/s002880050114

M3 - Article

AN - SCOPUS:0000257126

SN - 1434-6044

VL - 70

SP - 357

EP - 369

JO - European Physical Journal C

JF - European Physical Journal C

IS - 3

ER -

Measurement of heavy quark forward-backward asymmetries and average B mixing using leptons in multihadronic events

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