BEGIN:VCALENDAR VERSION:2.0 PRODID:-//linuxsoftware.nz//NONSGML Joyous v1.4//EN BEGIN:VEVENT SUMMARY:Constraining Multi-scalars models with colliders and Dark Matter DTSTART:20250917T093000Z DTEND:20250917T110000Z DTSTAMP:20260612T152557Z UID:bd3f343c-f241-4ee0-8554-0c9987032f02 SEQUENCE:2 CREATED:20250915T145342Z DESCRIPTION:After the observation in 2012 of a new scalar particle closely resembling the Higgs boson of the Standard Model of particle physics\, th ere is a general consensus that there must be Physics Beyond the Standard Model\, with present experiments now dedicated to its discovery. Extending the scalar sector is motivated by key unresolved issues in particle physi cs including the need of new sources of Charge Parity violation\, providin g an explanation of the baryon asymmetry in the universe\, or to explain D ark Matter\, which comprises of order 85% of the matter content of the Uni verse. In this thesis\, we focus on three Higgs doublets models (3HDM) and the constraints that need to be imposed. We add theoretical contributions for the consistency of the scalar potential\, with boundedness from below and the global minimum. We consider all constraints for full phenomenolog ical studies in models with different symmetries\, studying their individu al impact and attempting to distinguish the models based on data. We propo se a model with Charge Parity violating coefficients\, leading to Higgs co uplings that significantly deviate from Standard Model values and remain a llowed. To explore the parameter space of the model\, we employ an efficie nt Machine Learning algorithm that finds new regions of parameter space an d observable consequences\, not found with previous techniques we develope d and applied. The new techniques are applicable to any Physics Beyond the Standard Model scenario. We connect the scalar extensions with experiment ally viable solutions to the Dark Matter problem. When building Dark Matte r models\, one often imposes conserved discrete symmetries to stabilize DM candidates. We consider a possibility with two DM candidates\, and an alt ernative possibility of a conserved non-Abelian group leading to a viable DM\, in an attempt to chart the limits of what Multi-Higgs Models can acco mmodate. LAST-MODIFIED:20250915T145354Z LOCATION:Sala 02.1 do Centro de Congressos (Piso -2 do Pavilhão de Civil) do IST URL:http://df.vps.tecnico.ulisboa.pt/pt/eventos/constraining-multi-scalars -models-with-colliders-and-dark-matter/ X-ALT-DESC;FMTTYPE=text/html:

After the observati on in 2012 of a new scalar particle closely resembling the Higgs boson of the Standard Model of particle physics\, there is a general consensus that there must be Physics Beyond the Standard Model\, with present experiment s now dedicated to its discovery.

Extending the scalar sector is motivated by key unresolved issues in particle physics including the need of new sources of Charge Parity violation\, providing an explanation of t he baryon asymmetry in the universe\, or to explain Dark Matter\, which co mprises of order 85% of the matter content of the Universe. In this thesis \, we focus on three Higgs doublets models (3HDM) and the constraints that need to be imposed. We add theoretical contributions for the consistency of the scalar potential\, with boundedness from below and the global minim um.

We consider all constraints for full phenomenological studie s in models with different symmetries\, studying their individual impact a nd attempting to distinguish the models based on data. We propose a model with Charge Parity violating coefficients\, leading to Higgs couplings tha t significantly deviate from Standard Model values and remain allowed.

To explore the parameter space of the model\, we employ an efficien t Machine Learning algorithm that finds new regions of parameter space and observable consequences\, not found with previous techniques we developed and applied. The new techniques are applicable to any Physics Beyond the Standard Model scenario. We connect the scalar extensions with experimenta lly viable solutions to the Dark Matter problem. When building Dark Matter models\, one often imposes conserved discrete symmetries to stabilize DM candidates. We consider a possibility with two DM candidates\, and an alte rnative possibility of a conserved non-Abelian group leading to a viable D M\, in an attempt to chart the limits of what Multi-Higgs Models can accom modate.

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