First observation of forward Z→bb¯ production in pp collisions at s=8 TeV

R. Aaij; B. Adeva; M. Adinolfi; Z. Ajaltouni; S. Akar; J. Albrecht; F. Alessio; M. Alexander; A. Alfonso Albero; S. Ali; G. Alkhazov; P. Alvarez Cartelle; A. A. Alves; S. Amato; S. Amerio; Y. Amhis; L. An; L. Anderlini; G. Andreassi; M. Andreotti; J. E. Andrews; R. B. Appleby; F. Archilli; P. d'Argent; J. Arnau Romeu; A. Artamonov; M. Artuso; I. Babuschkin; W. Barter; A. Bitadze; S. Borghi; J. Brodzicka; C. Burr; L. Capriotti; S. De Capua; G. Dujany; E. Gersabeck; M. Gersabeck; L. Grillo; J. Harrison; C. Hombach; S. Klaver; G. Lafferty; K. Maguire; A. McNab; C. Parkes; A. Pearce; E. Rodrigues; P. Rodriguez Perez; G. Sarpis; LHCb Collaboration

doi:10.1016/j.physletb.2017.11.066

First observation of forward Z→bb¯ production in pp collisions at s=8 TeV

R. Aaij, B. Adeva, M. Adinolfi, Z. Ajaltouni, S. Akar, J. Albrecht, F. Alessio, M. Alexander, A. Alfonso Albero, S. Ali, G. Alkhazov, P. Alvarez Cartelle, A. A. Alves, S. Amato, S. Amerio, Y. Amhis, L. An, L. Anderlini, G. Andreassi, M. AndreottiJ. E. Andrews, R. B. Appleby, F. Archilli, P. d'Argent, J. Arnau Romeu, A. Artamonov, M. Artuso, I. Babuschkin, W. Barter, A. Bitadze, S. Borghi, J. Brodzicka, C. Burr, L. Capriotti, S. De Capua, G. Dujany, E. Gersabeck, M. Gersabeck, L. Grillo, J. Harrison, C. Hombach, S. Klaver, G. Lafferty, K. Maguire, A. McNab, C. Parkes, A. Pearce, E. Rodrigues, P. Rodriguez Perez, G. Sarpis, LHCb Collaboration

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Abstract

The decay Z→bb¯ is reconstructed in pp collision data, corresponding to 2 fb⁻¹ of integrated luminosity, collected by the LHCb experiment at a centre-of-mass energy of s=8 TeV. The product of the Z production cross-section and the Z→bb¯ branching fraction is measured for candidates in the fiducial region defined by two particle-level b-quark jets with pseudorapidities in the range 2.2<η<4.2, with transverse momenta p_T>20 GeV and dijet invariant mass in the range 45<m_jj<165 GeV. From a signal yield of 5462±763 Z→bb¯ events, where the uncertainty is statistical, a production cross-section times branching fraction of 332±46±59 pb is obtained, where the first uncertainty is statistical and the second systematic. The measured significance of the signal yield is 6.0 standard deviations. This measurement represents the first observation of the Z→bb¯ production in the forward region of pp collisions.

Original language	English
Pages (from-to)	430-439
Number of pages	10
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	776
Early online date	5 Dec 2017
DOIs	https://doi.org/10.1016/j.physletb.2017.11.066
Publication status	Published - 10 Jan 2018

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10.1016/j.physletb.2017.11.066

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Aaij, R., Adeva, B., Adinolfi, M., Ajaltouni, Z., Akar, S., Albrecht, J., Alessio, F., Alexander, M., Alfonso Albero, A., Ali, S., Alkhazov, G., Alvarez Cartelle, P., Alves, A. A., Amato, S., Amerio, S., Amhis, Y., An, L., Anderlini, L., Andreassi, G., ... LHCb Collaboration (2018). First observation of forward Z→bb¯ production in pp collisions at s=8 TeV. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 776, 430-439. https://doi.org/10.1016/j.physletb.2017.11.066

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title = "First observation of forward Z→bb¯ production in pp collisions at s=8 TeV",

abstract = "The decay Z→bb¯ is reconstructed in pp collision data, corresponding to 2 fb−1 of integrated luminosity, collected by the LHCb experiment at a centre-of-mass energy of s=8 TeV. The product of the Z production cross-section and the Z→bb¯ branching fraction is measured for candidates in the fiducial region defined by two particle-level b-quark jets with pseudorapidities in the range 2.2<η<4.2, with transverse momenta pT>20 GeV and dijet invariant mass in the range 45jj<165 GeV. From a signal yield of 5462±763 Z→bb¯ events, where the uncertainty is statistical, a production cross-section times branching fraction of 332±46±59 pb is obtained, where the first uncertainty is statistical and the second systematic. The measured significance of the signal yield is 6.0 standard deviations. This measurement represents the first observation of the Z→bb¯ production in the forward region of pp collisions.",

author = "R. Aaij and B. Adeva and M. Adinolfi and Z. Ajaltouni and S. Akar and J. Albrecht and F. Alessio and M. Alexander and {Alfonso Albero}, A. 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 G. Andreassi and M. Andreotti and Andrews, {J. E.} and Appleby, {R. B.} and F. Archilli and P. d'Argent and {Arnau Romeu}, J. and A. Artamonov and M. Artuso and I. Babuschkin and W. Barter and A. Bitadze and S. Borghi and J. Brodzicka and C. Burr and L. Capriotti and {De Capua}, S. and G. Dujany and E. Gersabeck and M. Gersabeck and L. Grillo and J. Harrison and C. Hombach and S. Klaver and G. Lafferty and K. Maguire and A. McNab and C. Parkes and A. Pearce and E. Rodrigues and {Rodriguez Perez}, P. and G. Sarpis and {LHCb Collaboration}",

year = "2018",

month = jan,

day = "10",

doi = "10.1016/j.physletb.2017.11.066",

language = "English",

volume = "776",

pages = "430--439",

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

issn = "0370-2693",

publisher = "Elsevier BV",

}

Aaij, R, Adeva, B, Adinolfi, M, Ajaltouni, Z, Akar, S, Albrecht, J, Alessio, F, Alexander, M, Alfonso Albero, A, Ali, S, Alkhazov, G, Alvarez Cartelle, P, Alves, AA, Amato, S, Amerio, S, Amhis, Y, An, L, Anderlini, L, Andreassi, G, Andreotti, M, Andrews, JE, Appleby, RB, Archilli, F, d'Argent, P, Arnau Romeu, J, Artamonov, A, Artuso, M, Babuschkin, I, Barter, W, Bitadze, A, Borghi, S, Brodzicka, J, Burr, C, Capriotti, L, De Capua, S, Dujany, G, Gersabeck, E , Gersabeck, M, Grillo, L, Harrison, J, Hombach, C, Klaver, S, Lafferty, G, Maguire, K, McNab, A, Parkes, C, Pearce, A, Rodrigues, E, Rodriguez Perez, P, Sarpis, G & LHCb Collaboration 2018, 'First observation of forward Z→bb¯ production in pp collisions at s=8 TeV', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 776, pp. 430-439. https://doi.org/10.1016/j.physletb.2017.11.066

TY - JOUR

T1 - First observation of forward Z→bb¯ production in pp collisions at s=8 TeV

AU - Aaij, R.

AU - Adeva, B.

AU - Adinolfi, M.

AU - Ajaltouni, Z.

AU - Akar, S.

AU - Albrecht, J.

AU - Alessio, F.

AU - Alexander, M.

AU - Alfonso Albero, A.

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 - Andreassi, G.

AU - Andreotti, M.

AU - Andrews, J. E.

AU - Appleby, R. B.

AU - Archilli, F.

AU - d'Argent, P.

AU - Arnau Romeu, J.

AU - Artamonov, A.

AU - Artuso, M.

AU - Babuschkin, I.

AU - Barter, W.

AU - Bitadze, A.

AU - Borghi, S.

AU - Brodzicka, J.

AU - Burr, C.

AU - Capriotti, L.

AU - De Capua, S.

AU - Dujany, G.

AU - Gersabeck, E.

AU - Gersabeck, M.

AU - Grillo, L.

AU - Harrison, J.

AU - Hombach, C.

AU - Klaver, S.

AU - Lafferty, G.

AU - Maguire, K.

AU - McNab, A.

AU - Parkes, C.

AU - Pearce, A.

AU - Rodrigues, E.

AU - Rodriguez Perez, P.

AU - Sarpis, G.

AU - LHCb Collaboration

PY - 2018/1/10

Y1 - 2018/1/10

N2 - The decay Z→bb¯ is reconstructed in pp collision data, corresponding to 2 fb−1 of integrated luminosity, collected by the LHCb experiment at a centre-of-mass energy of s=8 TeV. The product of the Z production cross-section and the Z→bb¯ branching fraction is measured for candidates in the fiducial region defined by two particle-level b-quark jets with pseudorapidities in the range 2.2<η<4.2, with transverse momenta pT>20 GeV and dijet invariant mass in the range 45jj<165 GeV. From a signal yield of 5462±763 Z→bb¯ events, where the uncertainty is statistical, a production cross-section times branching fraction of 332±46±59 pb is obtained, where the first uncertainty is statistical and the second systematic. The measured significance of the signal yield is 6.0 standard deviations. This measurement represents the first observation of the Z→bb¯ production in the forward region of pp collisions.

AB - The decay Z→bb¯ is reconstructed in pp collision data, corresponding to 2 fb−1 of integrated luminosity, collected by the LHCb experiment at a centre-of-mass energy of s=8 TeV. The product of the Z production cross-section and the Z→bb¯ branching fraction is measured for candidates in the fiducial region defined by two particle-level b-quark jets with pseudorapidities in the range 2.2<η<4.2, with transverse momenta pT>20 GeV and dijet invariant mass in the range 45jj<165 GeV. From a signal yield of 5462±763 Z→bb¯ events, where the uncertainty is statistical, a production cross-section times branching fraction of 332±46±59 pb is obtained, where the first uncertainty is statistical and the second systematic. The measured significance of the signal yield is 6.0 standard deviations. This measurement represents the first observation of the Z→bb¯ production in the forward region of pp collisions.

UR - http://www.scopus.com/inward/record.url?scp=85037055831&partnerID=8YFLogxK

U2 - 10.1016/j.physletb.2017.11.066

DO - 10.1016/j.physletb.2017.11.066

M3 - Article

AN - SCOPUS:85037055831

SN - 0370-2693

VL - 776

SP - 430

EP - 439

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

ER -

First observation of forward Z→bb¯ production in pp collisions at s=8 TeV

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