Running with NLO_EW_Mode

[Generic User (don't modify these fields)]

Hi,

I'm unsuccessfully trying to Sherpa in NLO_EW_Mode for the process Process 93 93 -> 13 -13 93; using the run card,

(run){

% general settings EVENTS 0;

% tags and settings for scale definitions FSF:=1.0; RSF:=1.0; QSF:=1.0;

% tags and settings for ME generators ME_SIGNAL_GENERATOR Comix Amegic LHOLE; LHOLE_OLP GoSam;

LHOLE_CONTRACTFILE OLE_order.olc; EVENT_GENERATION_MODE Unweighted; EVENT_OUTPUT HepMC_GenEvent[Zj_highPT]; RESULT_DIRECTORY Results.FSF.RSF.QSF;

% model parameters MODEL SM; MASSIVE[15] 1; % collider setup BEAM_1 2212; BEAM_ENERGY_1 4000; BEAM_2 2212; BEAM_ENERGY_2 4000;

}(run);

(processes){

Process 93 93 -> 13 -13 93; Order (*,*); Integration_Error 0.08; NLO_EW_Mode Fixed_Order; NLO_EW_Part BVIRS; ME_Generator Amegic; RS_ME_Generator Comix; Loop_Generator LHOLE; End process;

}(processes);

(selector){

Mass 13 -13 40. E_CMS.; NJetFinder 1 400. 0. 0.4 -1;

}(selector);

The Run.dat file and Status directory are attached.

When I try this, I get the error, " No such process: (0x7ffec33c3c00){

cls = sum, hls = sum maxcpl = (99,99), mincpl = (0,0) ckkw = 0, nlo = 1, mhv = 1 scale = 'METS{MU_F2}{MU_R2}{MU_Q2}', kfactor = 'NO' megenerator = 'Amegic', loopgenerator = 'LHOLE' selectorfile = , mpi process = 0 gpath = , min t-channels = 0', max t-channels = 99 no_particle (2), NLO{,}: {

j j

} no_particle (3), NLO{,BVI}{3,3}: {

mu- mu+ j

}

} Sherpa: Matrix_Element_Handler::InitializeProcess throws critical error:

Failed to intialize process

"

This doesn't occur and it runs successfully if I alter NLO_EW_Mode and NLO_EW_Part to NLO_QCD_Mode and NLO_QCD_Part.

I don't understand why I get this error or how to correct it. I wonder if it's because Comix and Amegic can't produce the RS part for EW corrections?

There are no NLO_EW_Mode examples in the Manual to direct me. Is this function fully implemented?

Any advice/help regarding this problem would be welcome.

Thank you in advance, Marc

[Generic User (don't modify these fields)]

Run.dat file and Status Directory

[anonymous]

Hi Marc,

the public version does not yet support NLO EW calculations, though some infrastructure and switches for it already exist. This will be available in the next major release. Therefore, there are no examples for it yet. Sorry for not being more clear about that in the Manual.

Cheers, Marek