Changes between Version 11 and Version 12 of dim6top


Ignore:
Timestamp:
10/14/19 11:46:48 (9 months ago)
Author:
gdurieux
Comment:

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  • dim6top

    v11 v12  
    5454- [wiki:SMEFTatNLO SMEFT@NLO] normalizes the top dipole operator (with coefficient {{{ctG}}}) with a factor of the strong coupling constant {{{G}}} for compatibility with MG 2.x series at NLO in QCD. The 3.x series does not require it. This implies that {{{ctG_dim6top = G * ctG_SMEFTatNLO}}}. Note that {{{G}}} runs.
    5555
    56 Altogether, due to the enhanced quark flavour symmetry and to CP-conservation, [wiki:SMEFTatNLO SMEFT@NLO] only includes a subset of 45 top-quark operator coefficients:
    57 cQQ1, cQQ8, cQd1, cQd8, cQe1, cQe2, cQe3, cQl31, cQl32, cQl33, cQlM1, cQlM2, cQlM3, cQq11, cQq13, cQq81, cQq83, cQt1, cQt8, cQu1, cQu8, cblS3, cdp, cpQ3, cpQM, cpt, ctG, ctW, ctZ, ctd1, ctd8, cte1, cte2, cte3, ctl1, ctl2, ctl3, ctlS3, ctlT3, ctp, ctq1, ctq8, ctt1, ctu1, ctu8
    58 and equates cQb1=cQd1, cQb8=cQd8, ctb1=ctd1, ctb8=ctd8.
     56Altogether, due to the enhanced quark flavour symmetry and to CP-conservation, [wiki:SMEFTatNLO SMEFT@NLO] only includes a subset of 45 top-quark operator coefficients:[[br]]
     57cQQ1, cQQ8, cQd1, cQd8, cQe1, cQe2, cQe3, cQl31, cQl32, cQl33, cQlM1, cQlM2, cQlM3, cQq11, cQq13, cQq81, cQq83, cQt1, cQt8, cQu1, cQu8, cblS3, cdp, cpQ3, cpQM, cpt, ctG, ctW, ctZ, ctd1, ctd8, cte1, cte2, cte3, ctl1, ctl2, ctl3, ctlS3, ctlT3, ctp, ctq1, ctq8, ctt1, ctu1, ctu8[[br]]
     58and equates cQb1=cQd1, cQb8=cQd8, ctb1=ctd1, ctb8=ctd8. The chirality flipping and charged right-handed currents involving a bottom quark are in particular forbidden.
     59[[br]]
     60(Altogether, among the non-FCNC couplings, [wiki:SMEFTatNLO SMEFT@NLO] does not include:
     61ctpI, cpb, cptb, cptbI, ctWI, ctZI, cbW, cbWI, ctGI, ctlS1, ctlSI1, ctlS2, ctlSI2, ctlSI3, ctlT1, ctlTI1, ctlT2, ctlTI2, ctlTI3, cblS1, cblSI1, cblS2, cblSI2, cblSI3, ctQqu1, ctQqu1I, ctQqu8, ctQqu8I, cbQqd1, cbQqd1I, cbQqd8, cbQqd8I, cQtqd1, cQtqd1I, cQtqd8, cQtqd8I, cQbqu1, cQbqu1I, cQbqu8, cQbqu8I, ctQqu1T, ctQqu1TI, ctQqu8T, ctQqu8TI, cbQqd1T, cbQqd1TI, cbQqd8T, cbQqd8TI, cQtqd1T, cQtqd1TI, cQtqd8T, cQtqd8TI, cQbqu1T, cQbqu1TI, cQbqu8T, cQbqu8TI, cbtud1, cbtud1I, cbtud8, cbtud8I, cQtQb1, cQtQb8, cQtQb1I, cQtQb8I.)
    5962
    6063A high-precision comparison with [wiki:dim6top dim6top] has been performed at leading order following the prescription of [https://arxiv.org/abs/1906.12310 1906.12310], with the [https://bazaar.launchpad.net/~rwgtdim6/mg5amcnlo/plugin_eft_contrib/revision/ plugin_eft_contrib] of MG. More details are found in the arxiv note and in the {{{example}}} directory of the plugin.