The PR follows #1268 and has a more general syntax. Most of the madgraph samples in Summer20UL18 (at least H->gg samples) are assumed with a new PDF recipe called "NNPDF31_nnlo_as_0118_mc_hessian_pdfas" with id = 325300. The information is given by LHAPDF as the following :
<weightgroup combine="symmhessian+as" name="NNPDF31_nnlo_as_0118_mc_hessian_pdfas"> # 325300: NNPDF3.1 NNLO global fit, alphas(MZ)=0.118. mem=0 ; average on replicas (setting negative replicas to zero); mem=1-100 ; PDF eig.; mem=101 ; central value (forced positive definite) Alphas(MZ)=0.116; mem=102 ; central value (forced positive definite) Alphas(MZ)=0.120
Since it is symmhessian, maybe the additional hessian calculation is no long nesserary?
As for Powheg is assigned as "NNPDF31_nnlo_hessian_pdfas" with id = 306000.
The PR was tested using Powheg and Madgraph generator (the majority of the Higgs boson production) for Summer20UL18 samples. All can work well.
The PR follows #1268 and has a more general syntax. Most of the madgraph samples in Summer20UL18 (at least H->gg samples) are assumed with a new PDF recipe called "NNPDF31_nnlo_as_0118_mc_hessian_pdfas" with id = 325300. The information is given by LHAPDF as the following :
Since it is symmhessian, maybe the additional hessian calculation is no long nesserary?
As for Powheg is assigned as "NNPDF31_nnlo_hessian_pdfas" with id = 306000.
The PR was tested using Powheg and Madgraph generator (the majority of the Higgs boson production) for Summer20UL18 samples. All can work well.