Multiplicative-accumulative matching of NLO calculations with parton showers

Paolo Nason, Gavin P. Salam
2022 Journal of High Energy Physics  
We propose a new approach for combining next-to-leading order (NLO) and parton shower (PS) calculations so as to obtain three core features: (a) applicability to general showers, as with the MC@NLO and POWHEG methods; (b) positive-weight events, as with the KrkNLO and POWHEG methods; and (c) all showering attributed to the parton shower code, as with the MC@NLO and KrkNLO methods. This is achieved by using multiplicative matching in phase space regions where the shower overestimates the matrix
more » ... lement and accumulative (additive) matching in regions where the shower underestimates the matrix element, an approach that can be viewed as a combination of the MC@NLO and KrkNLO methods.
doi:10.1007/jhep01(2022)067 fatcat:irup6ifgpjerbc5fqro6hnf2ym