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Concept of Very-Asymmetric lepton Collider for dark matter search
Accelerator-based searches for dark matter are aiming for high sensitivity and need an experimental setup with high luminosity. This field of research is often called intensity frontier physics. One of the best motivated portals of interaction between dark matter and ordinary matter is a dark photon which could be observed as a resonance in the invariant mass of the decay products. Electron–positron collisions are known to be the cleanest interaction for such a study. In this paper we propose a scheme for a collider which allows for a luminosity of a few orders of magnitude higher than could be obtained in a conventional symmetric collider and with a few times higher accessible mass than is possible using a positron beam and a fixed target approach. The key concept is based on asymmetric energies: a high-energy circulating positron beam and a low-energy high-intensity electron beam, and optimization of the beam interaction region. We present here a configuration of a collision region of 10 MeV electron and 4 GeV positron beams.
Scattering Rates For Leptogenesis: Damping of Lepton Flavour Coherence and Production of Singlet Neutrinos
Abstract not provided
Alternative [SU(3)]4 model of leptonic color and dark matter
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Searches for supersymmetry with the ATLAS detector using final states with two leptons and missing transverse momentum in s = 7 TeV proton–proton collisions
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Search for pair produced fourth-generation up-type quarks in pp collisions at s = 7 TeV with a lepton in the final state
The results of a search for the pair production of a fourth-generation up-type quark (t') in proton-proton collisions at sqrt(s) = 7 TeV are presented, using data corresponding to an integrated luminosity of about 5.0 inverse femtobarns collected by the Compact Muon Solenoid experiment at the LHC. The t' quark is assumed to decay exclusively to a W boson and a b quark. Events with a single isolated electron or muon, missing transverse momentum, and at least four hadronic jets, of which at least one must be identified as a b jet, are selected. No significant excess of events over standard model expectations is observed. Upper limits for the t' anti-t' production cross section at 95% confidence level are set as a function of t' mass, and t'-quark production for masses below 570 GeV is excluded. The search is equally sensitive to nonchiral heavy quarks decaying to Wb. In this case, the results can be interpreted as upper limits on the production cross section times the branching fraction to Wb.
Forward–backward asymmetry of Drell–Yan lepton pairs in pp collisions at s = 7 TeV
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Measurement of the t t ¯ production cross section in pp collisions at s = 8 TeV in dilepton final states containing one τ lepton
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Search for new resonances decaying via WZ to leptons in proton–proton collisions at s = 8 TeV
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Measurement of the pp → ZZ production cross section and constraints on anomalous triple gauge couplings in four-lepton final states at s = 8 TeV
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