| 1 | # This is the README file for the HC_NLO_X0 UFO
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| 2 | # Authors: F. Demartin, M. Zaro
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| 3 | # email: federico.demartin@uclouvain.be
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| 4 | # Model version: 1.2
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| 5 |
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| 6 |
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| 7 | ___________________
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| 8 | *** CHANGELOG ***
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| 9 |
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| 10 | 1.2 (2015.06.02)
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| 11 | - Fixed a conflict with MadLoop for loop-induced processes
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| 12 | - Included instructions for single top + higgs production
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| 13 |
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| 14 | 1.1 (2014.04.03)
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| 15 | - Modified loop_particles attributes to be compliant with the new
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| 16 | conventions of UFO@NLO, effective in MG5_aMC starting from v2.1.1.
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| 17 | In particular, use PDG code instead of particle name.
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| 18 | Changes affect the following files: object_library.py, particles.py.
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| 19 | Other minor changes in some files: __init__.py, CT_parameters,
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| 20 | paramcard_heft.dat, restrict_heft.dat.
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| 21 |
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| 22 | 1.0 (2014.01.27)
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| 23 | - Release
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| 24 |
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| 25 | ___________________________
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| 26 | *** IMPORTANT REMARKS ***
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| 27 |
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| 28 | - Use with MG5_aMC 2.1.1 or later
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| 29 | - Only for single X0 production and decay
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| 30 | - 4F scheme with 'HC_NLO_X0' and 'HC_NLO_X0-4Fnoyb'
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| 31 | p,j = g u c d s u~ c~ d~ s~
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| 32 | - 5F scheme with 'HC_NLO_X0-no_b_mass' and 'HC_NLO_X0-heft'
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| 33 | p,j = g u c d s b u~ c~ d~ s~ b~
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| 34 | - Find below the correct instructions to generate a process
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| 35 |
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| 36 | ____________________________________________
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| 37 | *** INSTRUCTIONS TO GENERATE A PROCESS ***
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| 38 |
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| 39 | [1] GLUON FUSION + 0,1,2 JETS (GF) at NLO-QCD [arXiv:1306.6464, arXiv:1407.5089]
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| 40 |
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| 41 | > import model HC_NLO_X0-heft
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| 42 | > generate p p > x0 (j ...) / t [QCD]
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| 43 |
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| 44 | where '/ t' filters out diagrams with top loops, that are already
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| 45 | accounted for by the X0-gluons effective couplings in the limit Mtop->inf.
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| 46 |
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| 47 |
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| 48 | [2] WEAK VECTOR BOSON FUSION (VBF) at NLO-QCD [arXiv:1311.1829]
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| 49 |
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| 50 | > import model HC_NLO_X0(-no_b_mass)
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| 51 | > generate p p > x0 j j $$ w+ w- z / a [QCD]
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| 52 |
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| 53 | where '$$ w+ w- z' removes diagrams with W/Z in the s-channel, which
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| 54 | are included in VH production, and '/ a' removes diagrams with photons.
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| 55 |
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| 56 | Before you 'launch' the process, exit mg5_aMC, go to the output directory and
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| 57 | 1) comment with a hash '#' the line
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| 58 | tests.append('check_poles')
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| 59 | inside the file
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| 60 | bin/internal/amcatnlo_run_interface.py
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| 61 | 2) set to -1 the parameters
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| 62 | 'IRPoleCheckThreshold' and 'PrecisionVirtualAtRunTime'
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| 63 | in the file
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| 64 | Cards/FKSparams.dat .
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| 65 |
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| 66 |
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| 67 | [3] VECTOR BOSON ASSOCIATED PRODUCTION (VH) at NLO-QCD [arXiv:1311.1829]
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| 68 |
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| 69 | > import model HC_NLO_X0(-no_b_mass)
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| 70 | > generate p p > x0 l+ vl [QCD]
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| 71 | > add process p p > x0 l- vl~ [QCD]
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| 72 | > add process p p > x0 l+ l- / a [QCD]
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| 73 |
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| 74 | where '/ a' removes diagrams with photons.
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| 75 |
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| 76 |
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| 77 | [4] TOP PAIR ASSOCIATED PRODUCTION (ttH) at NLO-QCD [arXiv:1407.5089]
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| 78 |
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| 79 | > import model HC_NLO_X0(-no_b_mass)
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| 80 | > generate p p > x0 t t~ [QCD]
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| 81 |
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| 82 |
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| 83 | [5] SINGLE TOP ASSOCIATED PRODUCTION (tH) at NLO-QCD [arXiv:1504.00611]
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| 84 |
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| 85 | t-channel, 4-flavour scheme:
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| 86 | > import model HC_NLO_X0-4Fnoyb
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| 87 | > generate p p > x0 t b~ j $$ w+ w- [QCD]
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| 88 | > add process p p > x0 t~ b j $$ w+ w- [QCD]
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| 89 |
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| 90 | t-channel, 5-flavour scheme:
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| 91 | > import model HC_NLO_X0-no_b_mass
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| 92 | > generate p p > x0 t j $$ w+ w- [QCD]
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| 93 | > add process p p > x0 t~ j $$ w+ w- [QCD]
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| 94 |
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| 95 | s-channel:
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| 96 | > import model HC_NLO_X0(-no_b_mass)
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| 97 | > generate p p > w+ > x0 t b~ [QCD]
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| 98 | > add process p p > w- > x0 t~ b [QCD]
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| 99 |
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| 100 |
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| 101 | __________________________
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| 102 | *** ACKNOWLEDGEMENTS ***
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| 103 |
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| 104 | This UFO model contains parts of the following models:
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| 105 | - loop_sm by V. Hirschi
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| 106 | - heft by N. Christensen, C. Duhr;
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| 107 | - HC (HiggsCharacterisation) by P. de Aquino, K. Mawatari.
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| 108 |
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| 109 | The R2 counterterms for the H-gluons vertices have firstly
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| 110 | been computed by B. J. Page and R. Pittau [arXiv:1307.6142].
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| 111 |
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| 112 | F.D. thanks the following people for their support during the
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| 113 | implementation and validation of this model:
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| 114 | C. Degrande, R. Frederix, V. Hirschi, F. Maltoni, O. Mattelaer,
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| 115 | K. Mawatari, B. J. Page, T. Peraro, R. Pittau, M. Zaro.
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| 116 |
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