check whether phase space finds poles
Hi
is there a way to check whether the phase space integrator misses some narrow resonances in the decay chain ? I.e. if I have e.g. a 6 particle final state from pair-production and subsequent onshell resonant decays, with e.g. width/mass ~ permill for intermediate particles, is the phase space integrator supposed to correctly identify these resonances ? I am asking because the naive factorization result (production times decay) renders a result very different from the actual madgraph result. Things are OK if I e.g. force ma~ mb+mc for an intermediate a-> b c. ? Maybe its also a feature of the process, but I want to make sure it does not come from suboptimal phase space parametrization resulting in missed resonances, and if so, whether there is a way to improve this (other than artifically enhancing the width and rescaling the final result)
Thanks a lot in advance !!
Best Tania
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