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--- 2017:groups:higgs:lsp [2017/06/20 15:43]
haiying.cai
+++ 2017:groups:higgs:lsp [2017/10/01 11:20] (current)
jonathan.butterworth
@@ Line 1: / Line 1: @@
-__Interested people:__ //Jose Miguel No, Jose Zurita, Stefania Gori, Ken Mimasu, Linda Finco, Sijing Zhang, Susan Gascon-Shotkin, Grégory Moreau, Haiying Cai, Sylvain Fichet, Thomas Flacke, Stefan Liebler, //
+__Interested people:__ //Jose Miguel No, Jose Zurita, Stefania Gori, Ken Mimasu, Linda Finco, Sijing Zhang, Susan Gascon-Shotkin, Grégory Moreau, Haiying Cai, Sylvain Fichet, Thomas Flacke, Stefan Liebler, Daniele Barducci, Andrei Angelescu, Jon Butterworth//
@@ Line 15: / Line 15: @@
 Looking at scalar couplings to fermions, other production and decay modes ( $\phi \to \tau \tau$  or  $\phi \to b \bar b$  [reconstructing the invariant scalar mass]) could be studied as well.
-Gauge invariant (pseudo-)scalar couplings to ZZ, WW,  $\gamma\gamma$ ,  $\gamma$ Z, gluon-gluon: $$\frac{\phi}{\Lambda_1}\vert D_\mu H\vert^2 \ \ (for \ scalars \ only) \ \ and \ \ \frac{\phi}{\Lambda_2} Tr[V_{\mu\nu} \tilde V^{\mu\nu}] \ .$$
+Gauge invariant (pseudo-)scalar couplings to ZZ, WW,  $\gamma\gamma$ ,  $\gamma$ Z, gluon-gluon: $$\frac{\phi}{f_H}\vert D_\mu H\vert^2
+\ , \ \ \frac{\phi}{f_Z} Tr[V_{\mu\nu} V^{\mu\nu}]
+\ \ and \ \ \frac{\phi}{\tilde f_Z} Tr[V_{\mu\nu} \tilde V^{\mu\nu}] \ .$$
 Two other effective parameters:  $\phi$  mass ( $m_\phi$ ) and Branching for  $\phi \to \gamma \gamma$  ( $B_\gamma$ ).
@@ Line 30: / Line 32: @@
 (2) produce kinematical distributions for the signal with MadGRAPH (directly from the LHE files with madAnalysis for example)
 (3) interface the DELPHES detector response simulator (at the MadGRAPH level)
-(4) compare distributions for SM-like couplings ($1/\Lambda_1 $) and kinetic-like couplings ($ 1/\Lambda_2$) [also to develop a discrimination test between e.g. a light Higgs and a radion]
+(4) compare distributions for SM-like couplings ($1/f_H$) and kinetic-like couplings ( $1/​f_Z$ , $1/\tilde f_Z$) [also to develop a discrimination test between e.g. a light Higgs and a radion]
 (5) simulate SM background events as well (main physical one: Drell-Yan + double ISR/FSR ?)
 (6) optimise a set of selection cuts
-(7) obtain a sensitivity plot (prospective for Run 2) in the 3-dimension parameter space:  $m_\phi$ , $1/\Lambda_1 $,$ 1/\Lambda_2 $[=couplings for the considered gauge bosons] for$ B_\gamma $=100% (plot to be simply rescaled accordingly to the wanted$ B_\gamma$ value then). (+motivate EXP analysis of exclusion limits from Run 1 data?).
+(7) obtain a sensitivity plot (prospective for Run 2) in the parameter space:  $m_\phi$ , $1/f_H $,$ 1/f_Z $,$ 1/\tilde f_Z $[=couplings for the considered gauge bosons] for$ B_\gamma $=100% (plot to be simply rescaled accordingly to the wanted$ B_\gamma$ value then). (+motivate EXP analysis of exclusion limits from Run 1 data?).
 Goal: derive a generic plot that can be recast to any specific theoretical scenario with a light (pseudo-)scalar, and, determine its complementarity with LEP(,EWPT) bounds.
+Tools: Some of us are looking at this using [[2017:groups:tools:contur_for_light_scalar_particles|Contur]].

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