First Measurement of the Charge Asymmetry in Beauty-Quark Pair Production

R. Aaij; J.F.J. van den Brand; L.C. Garcia; K. De Bruyn; C. Farinelli; V.A.M. Heijne; T.J. Ketel; R. Koopman; D.M. Lambert; R.W. Lambert; J. van Leerdam; Y.J. Li; M.H.M. Merk; S. Oggero; H.G. Raven; M. Schiller; V. Syropoulos; S. Tolk; M. Garcia; S. Wu

doi:10.1103/PhysRevLett.113.082003

First Measurement of the Charge Asymmetry in Beauty-Quark Pair Production

R. Aaij, J.F.J. van den Brand, L.C. Garcia, K. De Bruyn, C. Farinelli, V.A.M. Heijne, T.J. Ketel, R. Koopman, D.M. Lambert, R.W. Lambert, J. van Leerdam, Y.J. Li, M.H.M. Merk, S. Oggero, H.G. Raven, M. Schiller, V. Syropoulos, S. Tolk, M. Garcia, S. Wu

(Astro)-Particles Physics

Research output: Contribution to Journal › Article › Academic › peer-review

Abstract

The difference in the angular distributions between beauty quarks and antiquarks, referred to as the charge asymmetry, is measured for the first time in bb̄ pair production at a hadron collider. The data used correspond to an integrated luminosity of 1.0fb-1 collected at 7 TeV center-of-mass energy in proton-proton collisions with the LHCb detector. The measurement is performed in three regions of the invariant mass of the bb̄ system. The results obtained are ACbb̄(40<Mbb̄<75GeV/c2)=0.4±0.4±0.3%, ACbb̄(75<Mbb̄<105GeV/c2)=2.0±0.9±0.6%, ACbb̄(Mbb̄>105GeV/c2)=1.6±1.7±0.6%, where ACbb̄ is defined as the asymmetry in the difference in rapidity between jets formed from the beauty quark and antiquark, where in each case the first uncertainty is statistical and the second systematic. The beauty jets are required to satisfy 2<η<4, ET>20GeV, and have an opening angle in the transverse plane Δφ>2.6rad. These measurements are consistent with the predictions of the standard model. © Published by the American Physical Society.

Original language	English
Pages (from-to)	082003-082003
Journal	Physical Review Letters
Volume	113
Issue number	8
DOIs	https://doi.org/10.1103/PhysRevLett.113.082003
Publication status	Published - 2014

Bibliographical note

PT: J; NR: 38; TC: 1; J9: PHYS REV LETT; PG: 9; GA: AW8IF; UT: WOS:000346504200005

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10.1103/PhysRevLett.113.082003

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Aaij, R., van den Brand, J. F. J., Garcia, L. C., De Bruyn, K., Farinelli, C., Heijne, V. A. M., Ketel, T. J., Koopman, R., Lambert, D. M., Lambert, R. W., van Leerdam, J., Li, Y. J., Merk, M. H. M., Oggero, S., Raven, H. G., Schiller, M., Syropoulos, V., Tolk, S., Garcia, M., & Wu, S. (2014). First Measurement of the Charge Asymmetry in Beauty-Quark Pair Production. Physical Review Letters, 113(8), 082003-082003. https://doi.org/10.1103/PhysRevLett.113.082003

@article{f0386936ad214c92beea6879072628be,

title = "First Measurement of the Charge Asymmetry in Beauty-Quark Pair Production",

abstract = "The difference in the angular distributions between beauty quarks and antiquarks, referred to as the charge asymmetry, is measured for the first time in b{\=b} pair production at a hadron collider. The data used correspond to an integrated luminosity of 1.0fb-1 collected at 7 TeV center-of-mass energy in proton-proton collisions with the LHCb detector. The measurement is performed in three regions of the invariant mass of the b{\=b} system. The results obtained are ACb{\=b}(40105GeV/c2)=1.6±1.7±0.6\%, where ACb{\=b} is defined as the asymmetry in the difference in rapidity between jets formed from the beauty quark and antiquark, where in each case the first uncertainty is statistical and the second systematic. The beauty jets are required to satisfy 2<η<4, ET>20GeV, and have an opening angle in the transverse plane Δφ>2.6rad. These measurements are consistent with the predictions of the standard model. {\textcopyright} Published by the American Physical Society.",

author = "R. Aaij and \{van den Brand\}, J.F.J. and L.C. Garcia and \{De Bruyn\}, K. and C. Farinelli and V.A.M. Heijne and T.J. Ketel and R. Koopman and D.M. Lambert and R.W. Lambert and \{van Leerdam\}, J. and Y.J. Li and M.H.M. Merk and S. Oggero and H.G. Raven and M. Schiller and V. Syropoulos and S. Tolk and M. Garcia and S. Wu",

note = "PT: J; NR: 38; TC: 1; J9: PHYS REV LETT; PG: 9; GA: AW8IF; UT: WOS:000346504200005",

year = "2014",

doi = "10.1103/PhysRevLett.113.082003",

language = "English",

volume = "113",

pages = "082003--082003",

journal = "Physical Review Letters",

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Aaij, R, van den Brand, JFJ, Garcia, LC, De Bruyn, K, Farinelli, C, Heijne, VAM, Ketel, TJ, Koopman, R, Lambert, DM, Lambert, RW, van Leerdam, J, Li, YJ, Merk, MHM, Oggero, S, Raven, HG, Schiller, M, Syropoulos, V, Tolk, S, Garcia, M & Wu, S 2014, 'First Measurement of the Charge Asymmetry in Beauty-Quark Pair Production', Physical Review Letters, vol. 113, no. 8, pp. 082003-082003. https://doi.org/10.1103/PhysRevLett.113.082003

TY - JOUR

T1 - First Measurement of the Charge Asymmetry in Beauty-Quark Pair Production

AU - Aaij, R.

AU - van den Brand, J.F.J.

AU - Garcia, L.C.

AU - De Bruyn, K.

AU - Farinelli, C.

AU - Heijne, V.A.M.

AU - Ketel, T.J.

AU - Koopman, R.

AU - Lambert, D.M.

AU - Lambert, R.W.

AU - van Leerdam, J.

AU - Li, Y.J.

AU - Merk, M.H.M.

AU - Oggero, S.

AU - Raven, H.G.

AU - Schiller, M.

AU - Syropoulos, V.

AU - Tolk, S.

AU - Garcia, M.

AU - Wu, S.

N1 - PT: J; NR: 38; TC: 1; J9: PHYS REV LETT; PG: 9; GA: AW8IF; UT: WOS:000346504200005

PY - 2014

Y1 - 2014

N2 - The difference in the angular distributions between beauty quarks and antiquarks, referred to as the charge asymmetry, is measured for the first time in bb̄ pair production at a hadron collider. The data used correspond to an integrated luminosity of 1.0fb-1 collected at 7 TeV center-of-mass energy in proton-proton collisions with the LHCb detector. The measurement is performed in three regions of the invariant mass of the bb̄ system. The results obtained are ACbb̄(40105GeV/c2)=1.6±1.7±0.6%, where ACbb̄ is defined as the asymmetry in the difference in rapidity between jets formed from the beauty quark and antiquark, where in each case the first uncertainty is statistical and the second systematic. The beauty jets are required to satisfy 2<η<4, ET>20GeV, and have an opening angle in the transverse plane Δφ>2.6rad. These measurements are consistent with the predictions of the standard model. © Published by the American Physical Society.

AB - The difference in the angular distributions between beauty quarks and antiquarks, referred to as the charge asymmetry, is measured for the first time in bb̄ pair production at a hadron collider. The data used correspond to an integrated luminosity of 1.0fb-1 collected at 7 TeV center-of-mass energy in proton-proton collisions with the LHCb detector. The measurement is performed in three regions of the invariant mass of the bb̄ system. The results obtained are ACbb̄(40105GeV/c2)=1.6±1.7±0.6%, where ACbb̄ is defined as the asymmetry in the difference in rapidity between jets formed from the beauty quark and antiquark, where in each case the first uncertainty is statistical and the second systematic. The beauty jets are required to satisfy 2<η<4, ET>20GeV, and have an opening angle in the transverse plane Δφ>2.6rad. These measurements are consistent with the predictions of the standard model. © Published by the American Physical Society.

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U2 - 10.1103/PhysRevLett.113.082003

DO - 10.1103/PhysRevLett.113.082003

M3 - Article

SN - 0031-9007

VL - 113

SP - 82003

EP - 82003

JO - Physical Review Letters

JF - Physical Review Letters

IS - 8

ER -

First Measurement of the Charge Asymmetry in Beauty-Quark Pair Production

Abstract

Bibliographical note

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