2017:groups:higgs:lsp
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2017:groups:higgs:lsp [2017/06/18 02:59] grgory.moreau |
2017:groups:higgs:lsp [2017/10/01 11:20] (current) jonathan.butterworth |
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| - | __Interested people:__ //Jose Miguel No, Jose Zurita, Stefania Gori, Ken Mimasu, Linda Finco, Sijing Zhang, Susan Gascon-Shotkin, Grégory Moreau, 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// |
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| 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. | 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 $\phi \to \gamma \gamma$ ($B_\gamma$). | Two other effective parameters: $\phi$ mass ($m_\phi$) and Branching for $\phi \to \gamma \gamma$ ($B_\gamma$). | ||
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| A first work Plan: | A first work Plan: | ||
| (1) implement the effective model into FeynRules | (1) implement the effective model into FeynRules | ||
| - | (2) interface the DELPHES detector response simulator (at the MadGRAPH level) | + | (2) produce kinematical distributions for the signal with MadGRAPH (directly from the LHE files with madAnalysis for example) |
| - | (3) produce kinematical distributions for the signal with MadGRAPH | + | (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 ?) | (5) simulate SM background events as well (main physical one: Drell-Yan + double ISR/FSR ?) | ||
| (6) optimise a set of selection cuts | (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. | 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]]. | ||
| - | **2. Complementarity with "single" phi production** [same context / strategy as in point **1.**] | + | **2. Complementarity with "single" scalar production** [same context / strategy as in point **1.**] |
| * VBF(+ISR/FSR): q q → q q $\phi$ [for low $m_\phi$, possible tag on the 2 jets?] | * VBF(+ISR/FSR): q q → q q $\phi$ [for low $m_\phi$, possible tag on the 2 jets?] | ||
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| - | **3. Exotic Higgs decays: What are the holes?** //[contact: Stefania Gori]// | + | **3. Exotic Higgs decays: What are the holes?** //[contact: Stefania Gori, Jose Miguel No]// |
| h → a a, Z a, a a' with a, a' scalar/pseudoscalar (for Z a, a is pseudoscalar) | h → a a, Z a, a a' with a, a' scalar/pseudoscalar (for Z a, a is pseudoscalar) | ||
2017/groups/higgs/lsp.1497747585.txt.gz · Last modified: 2017/06/18 02:59 by grgory.moreau
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