Changes between Version 1 and Version 2 of FourFermionFCNCtqll

Timestamp:

Mar 24, 2021, 1:00:56 PM (4 years ago)

Author:

Yoav Afik

Comment:

--

FourFermionFCNCtqll

@@ +1 @@
+== 4-fermion EFT bbll including interference with the SM
+
+== Authors:
+* Yoav Afik (yoavafik@campus.technion.ac.il) (1)
+* Shaouly Bar-Shalom (shaouly@physics.technion.ac.il) (1)
+* Amarjit Soni (2)
+* Jose Wudka (3)
+
+(1) Department of Physics, Technion: Israel Institute of Technology Haifa, Israel
+(2) Department of Physics, Brookhaven National Laboratory, Upton, NY, US
+(3) Department of Physics, University of California, Riverside, CA, US
+
+== Description of the model:
+This is a Contact Interaction model with t-u-l-l and t-c-l-l terms, for scalar, vector and tensor couplings. The effective Lagrangian of the model is described by:
+
+{{{ 
+#!latex 
+\begin{align*}
+{\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}~
+\end{align*}
+}}} 
+
+
+
+
+
+== Model Files:
+* [https://feynrules.irmp.ucl.ac.be/attachment/wiki/FourFermionbbll/bbll_UFO.zip bbll_UFO.zip] : the full model.
+
+== Commands for MadGraph5_aMC@NLO, for a production of an electron and a positron with jets:
+{{{
+define p = g u c d s b u~ c~ d~ s~ b~ 
+define j = g u c d s b u~ c~ d~ s~ b~ 
+generate p p > e+ e- NP^2>0
+add process p p > e+ e- j NP^2>0
+add process p p > e+ e- j j NP^2>0
 ...
+set LambdaS ...
+set Celbbll ...
+set Celbblr ...
+set Celbbrr ...
+set Celbbrl ...
+}}}
+
+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.
+
+== Similarly, commands for MadGraph5_aMC@NLO, for a production of a muon and an anti-muon with jets:
+{{{
+define p = g u c d s b u~ c~ d~ s~ b~ 
+define j = g u c d s b u~ c~ d~ s~ b~ 
+generate p p > mu+ mu- NP^2>0
+add process p p > mu+ mu- j NP^2>0
+add process p p > mu+ mu- j j NP^2>0
+...
+set LambdaS ...
+set Cmubbll ...
+set Cmubblr ...
+set Cmubbrr ...
+set Cmubbrl ...
+}}}
+
+
+
+== References:
+[1] Afik, Yoav and Bar-Shalom, Shaouly and Cohen, Jonathan and Rozen, Yoram. Phys. Lett. B. 807:135541, 2020, 1912.00425.
+ * Link to paper: https://www.sciencedirect.com/science/article/pii/S0370269320303452?via%3Dihub