In this study, predictions obtained in the four and in the five flavour schemes are compared for two important processes involving heavy flavours at the LHC: the production of a Z or a Higgs boson in association with b quarks. In particular we obtain predictions with SHERPA's MC@NLO implementation for the four-flavour scheme, treating the b's as massive, and with multijet merging at leading and next-to leading order for the five-flavour scheme. While differences between the two schemes, at the inclusive level, are well understood from resummation of possibly large logs into the b-PDFs, differences in shape present a major problem for experimental measurements. We make use of data for Z+b(b) production at the 7 TeV LHC to exhibit strengths and weaknesses of the different approaches and we use these results to validate predictions for b-associated Higgs-boson production at the 13 TeV Run II.
Napoletano, D., Krauss, F., Schumann, S. (2017). Bottom-quark mass effects in associated production with Z and H bosons. Intervento presentato a: 25th International Workshop on Deep-Inelastic Scattering and Related Subjects, DIS 2017, University of Birmingham, gbr [10.22323/1.297.0172].
Bottom-quark mass effects in associated production with Z and H bosons
Napoletano, D
;
2017
Abstract
In this study, predictions obtained in the four and in the five flavour schemes are compared for two important processes involving heavy flavours at the LHC: the production of a Z or a Higgs boson in association with b quarks. In particular we obtain predictions with SHERPA's MC@NLO implementation for the four-flavour scheme, treating the b's as massive, and with multijet merging at leading and next-to leading order for the five-flavour scheme. While differences between the two schemes, at the inclusive level, are well understood from resummation of possibly large logs into the b-PDFs, differences in shape present a major problem for experimental measurements. We make use of data for Z+b(b) production at the 7 TeV LHC to exhibit strengths and weaknesses of the different approaches and we use these results to validate predictions for b-associated Higgs-boson production at the 13 TeV Run II.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.