First measurement of the charge asymmetry in beauty-quark pair production

LHCb Collaboration; R. Aaij; B. Adeva; M. Adinolfi; A. Affolder; Z. Ajaltouni; S. Akar; J. Albrecht; F. Alessio; M. Alexander; S. Ali; G. Alkhazov; P. Alvarez Cartelle; A. A. Alves; S. Amato; S. Amerio; Y. Amhis; L. An; L. Anderlini; J. Anderson; R. Andreassen; M. Andreotti; J. E. Andrews; R. B. Appleby; O. Aquines Gutierrez; F. Archilli; A. Artamonov; M. Artuso; E. Aslanides; G. Auriemma; M. Baalouch; S. Bachmann; J. J. Back; A. Badalov; V. Balagura; W. Baldini; R. J. Barlow; C. Barschel; S. Barsuk; S. Bifani; N. Farley; P. Griffith; P. Ilten; I. R. Kenyon; C. Lazzeroni; A. Mazurov; J. McCarthy; C. J. Parkinson; L. Pescatore; D. Popov; N. K. Watson

doi:10.1103/PhysRevLett.113.082003

First measurement of the charge asymmetry in beauty-quark pair production

LHCb Collaboration, R. Aaij, B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, S. Akar, J. Albrecht, F. Alessio, M. Alexander, S. Ali, G. Alkhazov, P. Alvarez Cartelle, A. A. Alves, S. Amato, S. Amerio, Y. Amhis, L. An, L. Anderlini, J. AndersonR. Andreassen, M. Andreotti, J. E. Andrews, R. B. Appleby, O. Aquines Gutierrez, F. Archilli, A. Artamonov, M. Artuso, E. Aslanides, G. Auriemma, M. Baalouch, S. Bachmann, J. J. Back, A. Badalov, V. Balagura, W. Baldini, R. J. Barlow, C. Barschel, S. Barsuk, S. Bifani, N. Farley, P. Griffith, P. Ilten, I. R. Kenyon, C. Lazzeroni, A. Mazurov, J. McCarthy, C. J. Parkinson, L. Pescatore, D. Popov, N. K. Watson

Physics and Astronomy

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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 1.0 fb^-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 A^bb̄_C(40<M_bb̄<75GeV/c²)=0.4±0.4±0.3%, A^bb̄_C(75<M_bb̄<105GeV/c²)=2.0±0.9±0.6%, A^bb̄_C(M_bb̄>105GeV/c²)=1.6±1.7±0.6%, where A^bb̄_C 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, E_T>20GeV, and have an opening angle in the transverse plane Δφ>2.6rad. These measurements are consistent with the predictions of the standard model.

Original language	English
Article number	082003
Number of pages	9
Journal	Physical Review Letters
Volume	113
Issue number	8
DOIs	https://doi.org/10.1103/PhysRevLett.113.082003
Publication status	Published - 20 Aug 2014

ASJC Scopus subject areas

General Physics and Astronomy

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https://doi.org/10.1103/PhysRevLett.113.082003Licence: Creative Commons: Attribution (CC BY)

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LHCb Collaboration, Aaij, R., Adeva, B., Adinolfi, M., Affolder, A., Ajaltouni, Z., Akar, S., Albrecht, J., Alessio, F., Alexander, M., Ali, S., Alkhazov, G., Alvarez Cartelle, P., Alves, A. A., Amato, S., Amerio, S., Amhis, Y., An, L., Anderlini, L., ... Watson, N. K. (2014). First measurement of the charge asymmetry in beauty-quark pair production. Physical Review Letters, 113(8), Article 082003. https://doi.org/10.1103/PhysRevLett.113.082003

@article{6d099597d5ff47c9b8b23cbb95079dc1,

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 1.0 fb-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 Ab{\=b}C(40<Mb{\=b}<75GeV/c2)=0.4±0.4±0.3%, Ab{\=b}C(75<Mb{\=b}<105GeV/c2)=2.0±0.9±0.6%, Ab{\=b}C(Mb{\=b}>105GeV/c2)=1.6±1.7±0.6%, where Ab{\=b}C 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.",

author = "{LHCb Collaboration} and R. Aaij and B. Adeva and M. Adinolfi and A. Affolder and Z. Ajaltouni and S. Akar and J. Albrecht and F. Alessio and M. Alexander and S. Ali and G. Alkhazov and {Alvarez Cartelle}, P. and Alves, {A. A.} and S. Amato and S. Amerio and Y. Amhis and L. An and L. Anderlini and J. Anderson and R. Andreassen and M. Andreotti and Andrews, {J. E.} and Appleby, {R. B.} and {Aquines Gutierrez}, O. and F. Archilli and A. Artamonov and M. Artuso and E. Aslanides and G. Auriemma and M. Baalouch and S. Bachmann and Back, {J. J.} and A. Badalov and V. Balagura and W. Baldini and Barlow, {R. J.} and C. Barschel and S. Barsuk and S. Bifani and N. Farley and P. Griffith and P. Ilten and Kenyon, {I. R.} and C. Lazzeroni and A. Mazurov and J. McCarthy and Parkinson, {C. J.} and L. Pescatore and D. Popov and Watson, {N. K.}",

year = "2014",

month = aug,

day = "20",

doi = "10.1103/PhysRevLett.113.082003",

language = "English",

volume = "113",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society (APS)",

number = "8",

}

LHCb Collaboration, Aaij, R, Adeva, B, Adinolfi, M, Affolder, A, Ajaltouni, Z, Akar, S, Albrecht, J, Alessio, F, Alexander, M, Ali, S, Alkhazov, G, Alvarez Cartelle, P, Alves, AA, Amato, S, Amerio, S, Amhis, Y, An, L, Anderlini, L, Anderson, J, Andreassen, R, Andreotti, M, Andrews, JE, Appleby, RB, Aquines Gutierrez, O, Archilli, F, Artamonov, A, Artuso, M, Aslanides, E, Auriemma, G, Baalouch, M, Bachmann, S, Back, JJ, Badalov, A, Balagura, V, Baldini, W, Barlow, RJ, Barschel, C, Barsuk, S, Bifani, S, Farley, N, Griffith, P, Ilten, P, Kenyon, IR, Lazzeroni, C, Mazurov, A, McCarthy, J, Parkinson, CJ, Pescatore, L, Popov, D & Watson, NK 2014, 'First measurement of the charge asymmetry in beauty-quark pair production', Physical Review Letters, vol. 113, no. 8, 082003. https://doi.org/10.1103/PhysRevLett.113.082003

TY - JOUR

T1 - First measurement of the charge asymmetry in beauty-quark pair production

AU - LHCb Collaboration

AU - Aaij, R.

AU - Adeva, B.

AU - Adinolfi, M.

AU - Affolder, A.

AU - Ajaltouni, Z.

AU - Akar, S.

AU - Albrecht, J.

AU - Alessio, F.

AU - Alexander, M.

AU - Ali, S.

AU - Alkhazov, G.

AU - Alvarez Cartelle, P.

AU - Alves, A. A.

AU - Amato, S.

AU - Amerio, S.

AU - Amhis, Y.

AU - An, L.

AU - Anderlini, L.

AU - Anderson, J.

AU - Andreassen, R.

AU - Andreotti, M.

AU - Andrews, J. E.

AU - Appleby, R. B.

AU - Aquines Gutierrez, O.

AU - Archilli, F.

AU - Artamonov, A.

AU - Artuso, M.

AU - Aslanides, E.

AU - Auriemma, G.

AU - Baalouch, M.

AU - Bachmann, S.

AU - Back, J. J.

AU - Badalov, A.

AU - Balagura, V.

AU - Baldini, W.

AU - Barlow, R. J.

AU - Barschel, C.

AU - Barsuk, S.

AU - Bifani, S.

AU - Farley, N.

AU - Griffith, P.

AU - Ilten, P.

AU - Kenyon, I. R.

AU - Lazzeroni, C.

AU - Mazurov, A.

AU - McCarthy, J.

AU - Parkinson, C. J.

AU - Pescatore, L.

AU - Popov, D.

AU - Watson, N. K.

PY - 2014/8/20

Y1 - 2014/8/20

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 1.0 fb-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 Abb̄C(40<Mbb̄<75GeV/c2)=0.4±0.4±0.3%, Abb̄C(75<Mbb̄<105GeV/c2)=2.0±0.9±0.6%, Abb̄C(Mbb̄>105GeV/c2)=1.6±1.7±0.6%, where Abb̄C 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.

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 1.0 fb-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 Abb̄C(40<Mbb̄<75GeV/c2)=0.4±0.4±0.3%, Abb̄C(75<Mbb̄<105GeV/c2)=2.0±0.9±0.6%, Abb̄C(Mbb̄>105GeV/c2)=1.6±1.7±0.6%, where Abb̄C 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.

UR - http://www.scopus.com/inward/record.url?scp=84907358645&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.113.082003

DO - 10.1103/PhysRevLett.113.082003

M3 - Article

AN - SCOPUS:84907358645

SN - 0031-9007

VL - 113

JO - Physical Review Letters

JF - Physical Review Letters

IS - 8

M1 - 082003

ER -

First measurement of the charge asymmetry in beauty-quark pair production

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