Changes between Version 2 and Version 3 of FourFermionFCNCtqll
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- Mar 24, 2021, 1:20:35 PM (4 years ago)
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FourFermionFCNCtqll
v2 v3 8 8 9 9 (1) Department of Physics, Technion: Israel Institute of Technology Haifa, Israel 10 10 11 (2) Department of Physics, Brookhaven National Laboratory, Upton, NY, US 12 11 13 (3) Department of Physics, University of California, Riverside, CA, US 12 14 … … 17 19 #!latex 18 20 \begin{align*} 19 {\cal L}_{tu\ell \ell} = {1\over\Lambda^2} \sum_{i,j=L,R} \biggl[ V_{ij}^\ell \left({\bar \ell} \gamma_\mu P_i \ell \right) \left( \bar t \gamma^\mu P_j u \right) + S_{ij}^\ell \left( {\bar \ell} P_i \ell \right) \left( \bar t P_j u \right) + T_{ij}^\ell \left( {\bar \ell} \sigma_{\mu \nu} P_i \ell \right) \left( \bar t \sigma_{\mu \nu} P_j u \right) \biggr] \label{4fermimatrix}~21 {\cal L}_{tu\ell \ell} = {1\over\Lambda^2} \sum_{i,j=L,R} \biggl[ V_{ij}^\ell \left({\bar \ell} \gamma_\mu P_i \ell \right) \left( \bar t \gamma^\mu P_j u \right) + S_{ij}^\ell \left( {\bar \ell} P_i \ell \right) \left( \bar t P_j u \right) + T_{ij}^\ell \left( {\bar \ell} \sigma_{\mu \nu} P_i \ell \right) \left( \bar t \sigma_{\mu \nu} P_j u \right) \biggr]~ 20 22 \end{align*} 21 23 }}} … … 26 28 27 29 == Model Files: 28 * [https://feynrules.irmp.ucl.ac.be/attachment/wiki/FourFermionbbll/bbll_UFO.zip bbll_UFO.zip] : the full model. 30 * [https://feynrules.irmp.ucl.ac.be/attachment/wiki/FourFermionFCNCtqll/4fermion-tqll-models.zip 4fermion-tqll-models.zip] : the full model. 31 * Please note there are two models, one for t-u-l-l, and one for t-c-l-l Contact Interactions. 29 32 30 == Commands for MadGraph5_aMC@NLO, for a production of a n electron and a positron withjets:33 == Commands for MadGraph5_aMC@NLO, for a production of a muon and an anti-muon with a top quark and up to one more jets: 31 34 {{{ 32 35 define p = g u c d s b u~ c~ d~ s~ b~ 33 36 define j = g u c d s b u~ c~ d~ s~ b~ 34 generate p p > e+ e- NP^2>0 35 add process p p > e+ e- j NP^2>0 36 add process p p > e+ e- j j NP^2>0 37 generate p p > mu+ mu- t NP^2==4 38 add process p p > mu+ mu- t~ NP^2==4 39 add process p p > mu+ mu- t j NP^2==4 40 add process p p > mu+ mu- t~ j NP^2==4 37 41 ... 38 set LambdaS ... 39 set Celbbll ... 40 set Celbblr ... 41 set Celbbrr ... 42 set Celbbrl ... 42 set lambdas... 43 set fSrr ... 44 set fTrr ... 45 set fVlr ... 46 set fVrl ... 47 set fVrr ... 48 set fVll ... 43 49 }}} 44 50 45 Where LambdaS is the scale of new physics in GeV, Celbbll is the bbee coupling with left-left chirality, etc. Note especially that the sign of Celbbll / Celbblr / Celbbrr / Celbbrl determines if the interference with the SM is constructive or destructive. 46 47 == Similarly, commands for MadGraph5_aMC@NLO, for a production of a muon and an anti-muon with jets: 48 {{{ 49 define p = g u c d s b u~ c~ d~ s~ b~ 50 define j = g u c d s b u~ c~ d~ s~ b~ 51 generate p p > mu+ mu- NP^2>0 52 add process p p > mu+ mu- j NP^2>0 53 add process p p > mu+ mu- j j NP^2>0 54 ... 55 set LambdaS ... 56 set Cmubbll ... 57 set Cmubblr ... 58 set Cmubbrr ... 59 set Cmubbrl ... 60 }}} 51 Where lambdas is the scale of new physics in GeV, fSrr is the coupling of t-u-l-l with scalar operator and right-right chirality of the fermions, etc. 61 52 62 53 63 54 64 55 == References: 65 [1] Afik, Yoav and Bar-Shalom, Shaouly and Cohen, Jonathan and Rozen, Yoram. Phys. Lett. B. 807:135541, 2020, 1912.00425.66 * Link to paper: https:// www.sciencedirect.com/science/article/pii/S0370269320303452?via%3Dihub56 [1] Afik, Yoav and Bar-Shalom, Shaouly and Soni, Amarjit and Wudka, Jose. 2101.05286. 57 * Link to paper: https://arxiv.org/abs/2101.05286
