Document type
ArticleVersion
Published versionPublication date
Publication license
Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/186517
First observation of forward Z→bb¯ production in pp collisions at s=8 TeV
Journal Title
Director/Tutor
Additional contribution
Journal ISSN
Volume Title
Abstract
The decay Z → b¯ b 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 → b¯ b 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 < m jj < 165 GeV. From a signal yield of 5462 ± 763 Z → b¯ b 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 → b¯ b production in the forward region of pp collisions.
Related resource
Subject (English)
Citation
Citation
ALFONSO ALBERO, Alejandro, et al. First observation of forward Z→bb¯ production in pp collisions at s=8 TeV. Physics Letters B. 2018. Vol. 776, num. 2018, pags. 430-439. ISSN 0370-2693. [consulted: 18 of October of 2026]. Available at: https://hdl.handle.net/2445/186517