Changes between Version 3 and Version 4 of dim6top
 Timestamp:
 02/16/18 13:42:05 (2 years ago)
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dim6top
v3 v4 1 1 = A complete topquark EFT implementation 2 2 3 Under the umbrella of the LHC TOP WG, common standards and prescriptions were established for the EFT interpretation of topquark measurements at the LHC. They are summarize in the note at [https://arxiv.org/abs/1802.xxxxx]. Details concerning the present UFO model implementation are provided in Appendix B.1.3 Under the umbrella of the LHC TOP WG, common standards and prescriptions were established for the EFT interpretation of topquark measurements at the LHC. They are summarized in the note at [https://arxiv.org/abs/1802.xxxxx]. Details concerning the present UFO model implementation are provided in Appendix B.1. 4 4 5 5 EFT degrees of freedom that are natural for the description of topquark processes were defined as linear combinations of Warsaw basis operator coefficients. They match the interference structure of the EFT with SM amplitudes and give a direct parametrization of the topquark couplings to physical W and Z gauge bosons. 6 6 7 The CKM matrix is approximated as a unit matrix. Masses and Yukawa couplings of all fermions except edfor the top and bottom quarks are neglected by default. A U(2)q+u+d flavour symmetry is imposed on the first two generations of quarks. All operators of the Warsaw basis involving a top quark and satisfying this flavour assumption are included (fourquark, twoquark, and twoquarktwolepton operators). Baryon and lepton number violating operators are not included. In total the model includes O(90) flavourconserving degrees of freedom which have a {{{DIM6=1}}} coupling order.7 The CKM matrix is approximated as a unit matrix. Masses and Yukawa couplings of all fermions except for the top and bottom quarks are neglected by default. A U(2)q+u+d flavour symmetry is imposed on the first two generations of quarks. All operators of the Warsaw basis involving a top quark and satisfying this flavour assumption are included (fourquark, twoquark, and twoquarktwolepton operators). Baryon and lepton number violating operators are not included. In total the model includes O(90) flavourconserving degrees of freedom which have a {{{DIM6=1}}} coupling order. 8 8 9 9 Enhancing the U(2)q+u+d flavour symmetry to U(2)q×U(2)u×U(2)d (the baseline scenario considered as prescription) is done by neglecting the 10+10 CPV supplementary degrees of freedom. A further restriction to the ''topphilic'' can also be obtained following the constraints given in the note.