775 research outputs found

    Precision measurement of the Z invisible width with the CMS experiment

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    A precision measurement of the partial width of the Z boson decay to an invisible final state is reported. Events from proton-proton collisions provided by the Large Hadron Collider at a centre-of-mass energy of 13 TeV are collected by the Compact Muon Solenoid experiment with the invisibly decaying Z bosons inferred from a hadronic recoil. The data collected corresponds to a total integrated luminosity of 35.9 fb−1. The invisible width is measured to be 512+16−15 MeV, consistent with the standard model. This is a competitive result to previous measurements performed at the Large Electron Positron collider. The measurement is systematically dominated by uncertainties associated with the measurement of the energy scale of the recoiling hadronic system.Open Acces

    Pushing the precision frontier at the LHC with V+jets

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    This documents the proceedings from a workshop titled `Illuminating Standard candles at the LHC: V+jets' held at Imperial College London on 25th-26th April 2017. It summarises the numerous contributions to the workshop, from the experimental overview of V+jets measurements at CMS and ATLAS and their role in searching for physics beyond the Standard Model to the status of higher order perturbative calculations to these processes and their inclusion in state of the art Monte Carlo simulations. An executive summary of the ensuing discussions including a list of outcomes and wishlist for future consideration is also presented

    Measurement of t(t)over-bar normalised multi-differential cross sections in pp collisions at root s=13 TeV, and simultaneous determination of the strong coupling strength, top quark pole mass, and parton distribution functions

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    Measurement of the top quark forward-backward production asymmetry and the anomalous chromoelectric and chromomagnetic moments in pp collisions at √s = 13 TeV