Abstract
Abstract We present a general method that allows one to decay narrow resonances in Les Houches Monte Carlo events in an efficient and accurate way. The procedure preserves both spin correlation and finite width effects to a very good accuracy, and is therefore particularly suited for the decay of resonances in production events generated at next-to-leading-order accuracy. The method is implemented as a generic tool in the Mad-Graph5 framework, giving access to a very large set of possible applications. We illustrate the validity of the method and the code by applying it to the case of single top and top quark pair production, and show its capabilities on the case of top quark pair production in association with a Higgs boson.
Highlights
Signatures characterized by a large particle multiplicity in the final state
We present a general method that allows one to decay narrow resonances in Les Houches Monte Carlo events in an efficient and accurate way
For the decay of Les Houches Events generated at next-to-leading-order accuracy, the procedure in MadSpin retains spin correlation effects at tree-level accuracy, i.e. no information from the virtual amplitude is used in calculating the weight of a specific decay configuration
Summary
Frixione et al recognized that, in the narrow width approximation, the maximum weight Wmax(X) can be expressed as a product of the differential cross section for the undecayed process dσno-dk/dx evaluated at X and a constant factor W dk that is independent of the undecayed event EX : Wmax (X ). They provided analytical formulae for the constants W dk’s associated with top quark and vector boson (W ±, Z) decays. We present our solutions for these problems in the two sections, respectively
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