SMEFT D6 ComparisonΒΆ

The Recola2 model file including the dimension-six operators in the Warsaw basis has been cross-checked against the SMEFTsim_A_U35_MwScheme_UFO_v2_1 UFO model file for the subset of operators that only involve gauge bosons and/or scalars. The numerical results corresponding to the former model have been obtained with the Recola2 matrix-element provider, while Madgraph5_aMC@NLO was used for the latter model. Below a sample output in the LHE format

        <weight id='mod1-cG-sq'>
          <weight_generator>MadGraph5_aMC@NLO_v2.6.3.2</weight_generator>
          <weight_model_version>SMEFTsim_A_U35_MwScheme_UFO_v2_1</weight_model_version>
          <weight_card>
            change model SMEFTsim_A_U35_MwScheme_UFO_v2_1-mod1-cG-sq
            change process  g g > g g  NP<=1 QED<=99 QCD<=99 SMHLOOP==0 NP^2==2 @1
            change process  h h > h h  NP<=1 QED<=99 QCD<=99 SMHLOOP==0 NP^2==2 @2
            change process  g g > h h  NP<=1 QED<=99 QCD<=99 SMHLOOP==0 NP^2==2 @3
            change process  a z > w+ w-  NP<=1 QED<=99 QCD<=99 SMHLOOP==0 NP^2==2 @4
            change process  g g > g g g  NP<=1 QED<=99 QCD<=99 SMHLOOP==0 NP^2==2 @5
            change process  u d~ > e+ ve a  NP<=1 QED<=99 QCD<=99 SMHLOOP==0 NP^2==2 @6
            change process  u u~ > e+ e- H  NP<=1 QED<=99 QCD<=99 SMHLOOP==0 NP^2==2 @7
          </weight_card>
          <weight_slha>
               Block frblock
            18 1.000000e+03 # LambdaSMEFT
            19 1.000000e+03 # cG
          </weight_slha>
        </weight>
        <weight id='mod2-cG-sq'>
          <weight_generator>Recola2 </weight_generator>
          <weight_model_version> eftdim6 </weight_model_version>
          <weight_card>
            change model eftdim6-mod2-cG-sq
            change process  g g -> g g LAM=1 LAM^2=2 @1
            change process  H H -> H H LAM=1 LAM^2=2 @2
            change process  g g -> H H LAM=1 LAM^2=2 @3
            change process  A Z -> W+ W- LAM=1 LAM^2=2 @4
            change process  g g -> g g g LAM=1 LAM^2=2 @5
            change process  u d~ -> e+ nu_e A LAM=1 LAM^2=2 @6
            change process  u u~ -> e+ e- H LAM=1 LAM^2=2 @7
          </weight_card>
          <weight_slha>
               Block EFTblock
            1 1.000000e+03 # CGx
            16 1.000000e-06 # LAM
          </weight_slha>
        </weight>
  <event>
      4      1 -1.00000E+00  9.11876E+01  1.00000E+00  1.18400E-01
      21    -1     0     0     0     0  0.000000000E+00  0.000000000E+00  5.000000000E+02  5.000000000E+02  0.000000000E+00  0.00000E+00  9.000E+00
      21    -1     0     0     0     0  0.000000000E+00  0.000000000E+00 -5.000000000E+02  5.000000000E+02  0.000000000E+00  0.00000E+00  9.000E+00
      21     1     1     2     0     0  1.109242844E+02  4.448307895E+02 -1.995529299E+02  5.000000000E+02  9.725607898E-06  0.00000E+00  9.000E+00
      21     1     1     2     0     0 -1.109242844E+02 -4.448307895E+02  1.995529299E+02  5.000000000E+02  1.009274029E-05  0.00000E+00  9.000E+00
     <rwgt>
        <wgt id='mod1-sm-sq'>  0.555539813E+02 </wgt>
        <wgt id='mod1-cG-sq'>  0.951865237E+08 </wgt>
        <wgt id='mod2-sm-sq'>  0.555539813E+02 </wgt>
        <wgt id='mod2-cG-sq'>  0.951865237E+08 </wgt>
     </rwgt>
  </event>

The full LHE file can be found here. As can be seen from the LHE file, the only differences between the predictions of the two models are some interference matrix-elements that however correspond to numerical zeros. This comparison as performed in [M+19].

References

M+19

Fabio Maltoni and others. Proposal for the validation of Monte Carlo implementations of the standard model effective field theory. 6 2019. arXiv:1906.12310.