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:20260624T154057Z UID:bd3f343c-f241-4ee0-8554-0c9987032f02 SEQUENCE:1 CREATED:20250915T145332Z DESCRIPTION: After the observation in 2012 of a new scalar particle closel y resembling the Higgs boson of the Standard Model of particle physics\, t here is a general consensus that there must be Physics Beyond the Standard Model\, with present experiments now dedicated to its discovery. Extendin g the scalar sector is motivated by key unresolved issues in particle phys ics including the need of new sources of Charge Parity violation\, providi ng an explanation of the baryon asymmetry in the universe\, or to explain Dark Matter\, which comprises of order 85% of the matter content of the Un iverse. In this thesis\, we focus on three Higgs doublets models (3HDM) an d the constraints that need to be imposed. We add theoretical contribution s for the consistency of the scalar potential\, with boundedness from belo w and the global minimum. We consider all constraints for full phenomenolo gical studies in models with different symmetries\, studying their individ ual impact and attempting to distinguish the models based on data. We prop ose a model with Charge Parity violating coefficients\, leading to Higgs c ouplings that significantly deviate from Standard Model values and remain allowed. To explore the parameter space of the model\, we employ an effici ent Machine Learning algorithm that finds new regions of parameter space a nd observable consequences\, not found with previous techniques we develop ed and applied. The new techniques are applicable to any Physics Beyond th e Standard Model scenario. We connect the scalar extensions with experimen tally viable solutions to the Dark Matter problem. When building Dark Matt er models\, one often imposes conserved discrete symmetries to stabilize D M candidates. We consider a possibility with two DM candidates\, and an al ternative 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 acc ommodate. LAST-MODIFIED:20250915T145332Z LOCATION:Sala 02.1 do Centro de Congressos (Piso -2 do Pavilhão de Civil) do IST URL:http://df.vps.tecnico.ulisboa.pt/en/events/constraining-multi-scalars- models-with-colliders-and-dark-matter/ X-ALT-DESC;FMTTYPE=text/html:

After the observat ion in 2012 of a new scalar particle closely resembling the Higgs boson of the Standard Model of particle physics\, there is a general consensus tha t there must be Physics Beyond the Standard Model\, with present experimen ts now dedicated to its discovery.

Extending the scalar sector i s motivated by key unresolved issues in particle physics including the nee d of new sources of Charge Parity violation\, providing an explanation of the baryon asymmetry in the universe\, or to explain Dark Matter\, which c omprises of order 85% of the matter content of the Universe. In this thesi s\, we focus on three Higgs doublets models (3HDM) and the constraints tha t need to be imposed. We add theoretical contributions for the consistency of the scalar potential\, with boundedness from below and the global mini mum.

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

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.

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