First observation of forward Z→bb[bar] production in pp collisions at √s=8TeV

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 r...

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Hauptverfasser: Aaij, Roel (VerfasserIn) , D'Argent, Philippe (VerfasserIn) , Bachmann, Sebastian (VerfasserIn) , Berninghoff, Daniel (VerfasserIn) , Braun, Svende (VerfasserIn) , Comerma-Montells, Albert (VerfasserIn) , De Cian, Michel (VerfasserIn) , Dziewiecki, Michal (VerfasserIn) , Esen, Sevda (VerfasserIn) , Gerick, David (VerfasserIn) , Grabowski, Jascha (VerfasserIn) , Han, Xiaoxue (VerfasserIn) , Hansmann-Menzemer, Stephanie (VerfasserIn) , Kecke, Matthieu (VerfasserIn) , Khanji, Basem (VerfasserIn) , Kolpin, Michael (VerfasserIn) , Kopecná, Renata (VerfasserIn) , Leverington, Blake (VerfasserIn) , Marks, Jörg (VerfasserIn) , Mitzel, Dominik (VerfasserIn) , Neubert, Sebastian (VerfasserIn) , Neuner, Max (VerfasserIn) , Nikodem, Thomas (VerfasserIn) , Piucci, Alessio (VerfasserIn) , Stahl, Marian (VerfasserIn) , Stemmle, Simon (VerfasserIn) , Uwer, Ulrich (VerfasserIn) , Zhelezov, Alexey (VerfasserIn)
Körperschaft: LHCb Collaboration (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 2018
In: Physics letters
Year: 2017, Jahrgang: 776, Pages: 430-439
ISSN:1873-2445
DOI:10.1016/j.physletb.2017.11.066
Online-Zugang:Verlag, Volltext: https://doi.org/10.1016/j.physletb.2017.11.066
Verlag, Volltext: http://www.sciencedirect.com/science/article/pii/S0370269317309589
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Verfasserangaben:LHCb Collaboration
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Zusammenfassung: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 45<mjj<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.
Beschreibung:Available online 5 December 2017
The LHCb Collaboration: R. Aaij, P. d'Argent, S. Bachmann, D.Berninghoff, S. Braun, A. Comerma-Montells, M. De Cian, M. Dziewieck, S. Esen, D. Gerick, J.P Grabowski, X. Han, S. Hansmann-Menzemer, M. Kecke, B. Khanji, M. Kolpin, R. Kopecná, B. Leverington, J. Marks, D.S. Mitzel, S. Neubert, M. Neuner, T. Nikodem, A. Piucci, M. Stahl, S. Stemmle, U. Uwer, A. Zhelezov [und weitere]
Gesehen am 16.07.2019
Beschreibung:Online Resource
ISSN:1873-2445
DOI:10.1016/j.physletb.2017.11.066