Results 1 - 10 of 5432
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[en] We analyze the Bethe-Heitler production of muon and heavy-lepton pairs using high-energy muon beams on a variety of targets. We give results for coherent production from a nucleus, for incoherent production from individual protons and neutrons, and for deep-inelastic production. Differential distributions are presented for the final leptons and the effects of experimental cuts are considered. This work complements our previous study of trimuon production via muon radiation, Compton radiation, and hadronic final-state interactions
[en] We discuss new physics in top-quark interactions, using an effective-field-theory approach. We consider top-quark decay, single top production, and top-quark pair production. We identify 15 dimension-six operators that contribute to these processes, and we compute the deviation from the standard model induced by these operators. The results provide a systematic way of searching for (or obtaining bounds on) physics beyond the standard model.
[en] A new theory of particle production in background gravitational fields is presented as an alternative to Hamiltonian diagonalization. We calculate a vacuum-vacumm transition amplitude and identify the expected pair creation rate in terms of the amount by which the modulus of this amplitude differs from unity. The method is applied to some Robertson--Walker cosmological models and is shown to give results differing from those obtained by Hamiltonian diagonalization