59 research outputs found
L1 Muon Trigger at the HL-LHC: the INFN community view of the Atlas and CMS perspectives
No full textA proposed Drift Tubes-seeded muon track trigger for the CMS experiment at the High Luminosity-LHC
No full textThe LHC program at 13 and 14 TeV, after the observation of the candidate SM Higgs boson, will help clarify future subjects of study and shape the needed tools. Any upgrade of the LHC experiments for unprecedented luminosities, such as the High Luminosity-LHC ones, must then maintain the acceptance on electroweak processes that can lead to a detailed study of the properties of the candidate Higgs boson. The acceptance of the key lepton, photon and hadron triggers should be kept such that the overall physics acceptance, in particular for low-mass scale processes, can be the same as the one the experiments featured in 2012.In such a scenario, a new approach to early trigger implementation is needed. One of the major steps will be the inclusion of high-granularity tracking sub-detectors, such as the CMS Silicon Tracker, in taking the early trigger decision. This contribution can be crucial in several tasks, including the confirmation of triggers in other subsystems, and the improvement of the on-line momentum measurement resolution.A muon track-trigger for the CMS experiment at the HL-LHC is presented. A back-extrapolation of Drift Tubes trigger primitives is proposed to match tracks found at Level 1 with muon candidates.The main figures-of-merit are presented, featuring sharp thresholds and less contamination from lower momentum muons, and an expected rate reduction of a factor 5 to 10 at typical thresholds with respect to an upgrade-less scenario
Residual Gauge Freedom And Brst Conditions In A Hamiltonian Formulation Of Algebraic Noncovariant Gauges
No full textA series of delicate points occurring in the quantization of Yang-Mills theories in algebraic non-covariant gauges is discussed. In particular the relation between subsidiary conditions and the seeming breakdown of the Lorentz covariance, the role of the residual gauge freedom and the relevance of the BRST procedure are focussed in the framework of the hamiltonian formulation
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High statistics measurement of the positron fraction in primary cosmic rays of 0.5-500 GeV with the alpha magnetic spectrometer on the international space station
No full textA precision measurement by AMS of the positron fraction in primary cosmic rays in the energy range from 0.5 to 500 GeV based on 10.9 million positron and electron events is presented. This measurement extends the energy range of our previous observation and increases its precision. The new results show, for the first time, that above similar to 200 GeV the positron fraction no longer exhibits an increase with energy.</p
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