5,412 research outputs found

    Measurement of the inelastic proton-proton cross section at s\sqrt{s} = 13 TeV

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    A measurement of the inelastic proton-proton cross section at a centre-of-mass energy of s\sqrt{s} = 13 TeV is presented. The analysis is performed using the CMS detector, in particular with information from forward calorimetry at pseudorapidities of 3.0 < {\eta} < 5.2 and -6.6 < {\eta} < -3.0. A visible cross section is measured in two different detector acceptances and finally extrapolated to the full inelastic phase space domain. The results are compared with those of other experiments, and with models used to describe high-energy hadronic interactions.Comment: 5 pages, 2 figures, proceedings of the XXIV International Workshop on Deep-Inelastic Scattering and Related Subjects, 11-15 April 2016, DESY Hamburg, German

    Treating jet correlations in high pile-up at hadron colliders

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    Experiments in the high-luminosity runs at the Large Hadron Collider face the challenges of very large pile-up. Primary techniques to deal with this are based on precise vertex and track reconstruction. Outside tracker acceptances, however, lie regions of interest for many aspects of the LHC physics program. We explore complementary approaches to pile-up treatment and propose a data-driven jet-mixing method which can be used outside tracker acceptances without depending on Monte Carlo generators. The method can be applied to treat correlation observables and take into account, besides the jet transverse momentum pedestal, effects of hard jets from pile-up.Comment: Latex. 8 pages, 5 figure

    Measurements of the forward energy flow and forward jet production with CMS

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    We present measurements of the forward (3 < |eta| < 5) energy flow in minimum bias events and in events with either hard jets or W and Z bosons produced at central rapidities together with first measurements of the inclusive forward jet cross section and central forward jet correlations. Results are compared to MC models with different parameter tunes for the description of the underlying event.Comment: 8 pages, DPF 2011 conference proceeding

    Higgs boson as a gluon trigger: the study of QCD in high pile-up environments

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    In the forthcoming high-luminosity phase of the LHC many of the most interesting measurements for precision QCD studies are hampered by large pile-up conditions, especially at not very high transverse momenta. However, with the recently discovered Higgs boson, which couples in the heavy top limit directly to gluons, we have access to a novel production process to probe QCD by a colour-singlet current. In this study we compare observables in Higgs boson and Drell-Yan production and investigate whether measuring ratios or subtractions can yield results that are stable in high pile-up environments, and yet sensitive to (small-pTp_{\text{T}}) QCD physics in gluon fusion processes. We present results of Monte Carlo event generator calculations for a few specific examples.Comment: 7 pages, 10 figures, DIS2014 conference proceeding
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