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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/186517
First observation of forward Z→bb¯ production in pp collisions at s=8 TeV
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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.
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ALFONSO ALBERO, Alejandro, CALVO GOMEZ, M., CAMBONI, Alessandro, COQUEREAU, Samuel, GARRIDO BELTRÁN, Lluís, GASCÓN FORA, David, GIRONELLA GIRONELL, Pere, GRACIANI DÍAZ, Ricardo, GRAUGÉS POUS, Eugeni, VAZQUEZ GOMEZ, R., LHCb collaboration. First observation of forward Z→bb¯ production in pp collisions at s=8 TeV. _Physics Letters B_. 2018. Vol. 776, núm. 2018, pàgs. 430-439. [consulta: 24 de gener de 2026]. ISSN: 0370-2693. [Disponible a: https://hdl.handle.net/2445/186517]