BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CERN//INDICO//EN BEGIN:VEVENT SUMMARY:Systematic construction of basis invariants for the most general t wo Higgs doublet model DTSTART;VALUE=DATE-TIME:20190913T140000Z DTEND;VALUE=DATE-TIME:20190913T141500Z DTSTAMP;VALUE=DATE-TIME:20260518T130805Z UID:indico-contribution-5-39@cern.ch DESCRIPTION:Speakers: Dr. TRAUTNER\, Andreas (MPIK Heidelberg)\nI introduc e generally applicable strategies for the construction of basis invariants in multi-Higgs models. Applied to the two Higgs doublet model (2HDM)\, th is allows us to find the full set of generating (CP-even and CP-odd) basis invariants. The complete ring of basis invariants is constructed\, and no vel relations between the CP-odd basis invariants emerge. This allows to d erive the basis invariant necessary and sufficient conditions for explicit CP (non-)conservation in the 2HDM.\n\nhttp://indico.fuw.edu.pl/contributi onDisplay.py?contribId=39&sessionId=5&confId=59 LOCATION:University of Warsaw 1.40 URL:http://indico.fuw.edu.pl/contributionDisplay.py?contribId=39&sessionId =5&confId=59 END:VEVENT BEGIN:VEVENT SUMMARY:Non-standard spontaneous symmetry breaking in the scalar sector at eV and TeV scales DTSTART;VALUE=DATE-TIME:20190913T144500Z DTEND;VALUE=DATE-TIME:20190913T150000Z DTSTAMP;VALUE=DATE-TIME:20260518T130805Z UID:indico-contribution-5-59@cern.ch DESCRIPTION:Speakers: KORDIACZYNSKA\, Magdalena (University of Silesia)\nI n my presentation I will be considering non-standard models with additiona l scalar triplets: without modification of the gauge group (Higgs Triplet Model - HTM) and with extended gauge group $SU(2)_R x SU(2)_L x U(1)$ (Lef t Right Symmetric Model - LRSM). Those two models vary in the triplet vacu um expectation value (VEV). Within the HTM we have to keep the triplet VEV at most at the range of GeV due to the $rho$ parameter\, and down to elec tronvolts due to the low energy constraints on lepton flavour violating pr ocesses and neutrino oscillation parameters. For LRSM\, relevant is the s cale connected with the $SU(2)_R$ triplet and VEV at least at the range of TeV\, to provide proper masses of non-standard gauge bosons. Both models predict existence of doubly charged scalar particles. Their production and decay channels will be checked for making a distinction between the two m odels in scenarios when masses of doubly charged scalars are the same.\n\n http://indico.fuw.edu.pl/contributionDisplay.py?contribId=59&sessionId=5&c onfId=59 LOCATION:University of Warsaw 1.40 URL:http://indico.fuw.edu.pl/contributionDisplay.py?contribId=59&sessionId =5&confId=59 END:VEVENT BEGIN:VEVENT SUMMARY:Geometry of Flat Directions in Scale-Invariant Potentials DTSTART;VALUE=DATE-TIME:20190913T150000Z DTEND;VALUE=DATE-TIME:20190913T151500Z DTSTAMP;VALUE=DATE-TIME:20260518T130805Z UID:indico-contribution-5-16@cern.ch DESCRIPTION:Speakers: Dr. KANNIKE\, Kristjan (National Institute of Chemic al Physics and Biophysics)\nWe show that biquadratic potentials admit nont rivial flat directions when the determinant of the quartic coupling matrix of the scalar fields vanishes. This consideration suggests a new approach to the problem of finding flat directions in scale-invariant theories\, n oticeably simplifying the study of scalar potentials involving many fields . The method generalizes to arbitrary quartic potentials by requiring that the hyperdeterminant of the tensor of scalar couplings be zero. We demons trate our approach with detailed examples pertaining to common scalar exte nsions of the Standard Model.\n\nhttp://indico.fuw.edu.pl/contributionDisp lay.py?contribId=16&sessionId=5&confId=59 LOCATION:University of Warsaw 1.40 URL:http://indico.fuw.edu.pl/contributionDisplay.py?contribId=16&sessionId =5&confId=59 END:VEVENT BEGIN:VEVENT SUMMARY:Classifying Continuous Symmetries in n-HDM DTSTART;VALUE=DATE-TIME:20190913T141500Z DTEND;VALUE=DATE-TIME:20190913T143000Z DTSTAMP;VALUE=DATE-TIME:20260518T130805Z UID:indico-contribution-5-55@cern.ch DESCRIPTION:Speakers: Dr. DAVISHI\, Neda (The University of Manchester)\nI n this talk\, I will discuss the construction of the multi-Higgs Doublet M odel (n-HDM) based on the Maximal symmetry Sp(2n$)/Z_2$. The maximal symme try n-HDM provides the natural SM alignment limit which is a phenomenologi cally rich framework with a special feature of unification of all quartic couplings. The list of most possible accidental symmetries as subgroups of symplectic group Sp(2n$)/Z_2$ realizable with n-HDM will be presented. We also introduce the prime invariant and irreducible representation in bili near field space to set up the scalar sector of n-HDMs potential. In parti cular\, will showcase this framework for the Two Higgs Doublet Model (2HDM ) and Three Higgs Doublet Model (3HDM) and present the list of all possibl e symmetries including the parameter spaces allowed by these symmetries in 2HDM and 3HDM.\n\nhttp://indico.fuw.edu.pl/contributionDisplay.py?contrib Id=55&sessionId=5&confId=59 LOCATION:University of Warsaw 1.40 URL:http://indico.fuw.edu.pl/contributionDisplay.py?contribId=55&sessionId =5&confId=59 END:VEVENT BEGIN:VEVENT SUMMARY:Two-loop corrections to the Higgs trilinear coupling in models wit h extended scalar sectors DTSTART;VALUE=DATE-TIME:20190913T151500Z DTEND;VALUE=DATE-TIME:20190913T153000Z DTSTAMP;VALUE=DATE-TIME:20260518T130805Z UID:indico-contribution-5-31@cern.ch DESCRIPTION:Speakers: Dr. BRAATHEN\, Johannes (Osaka University)\nThe prec ise study of the properties of the Higgs boson offers a unique and crucial opportunity to probe Beyond-the-Standard-Model (BSM) Physics indirectly. Among these\, the Higgs trilinear coupling is of particular importance\, b ecause it determines the shape of the Higgs potential and in turn the natu re of the electroweak phase transition (EWPT). It has been known for some time that\, in a variety of BSM models with extended Higgs sectors (e.g. w ith doublets\, singlets\, etc.)\, the value of the Higgs trilinear couplin g can deviate significantly from its Standard-Model (SM) prediction at one -loop order\, because of non-decoupling effects in the radiative correctio ns involving the additional scalar states. Indeed\, deviations from the SM can reach a hundred percent or more without violating perturbative unitar ity. Such effects would ensure that the EWPT is of strong first order\, wh ich is necessary for the success of the scenario of electroweak baryogenes is. It is then natural to ask if two-loop corrections can modify this resu lt\, and whether new large corrections can appear again. \nIn this talk\, I will present new results on dominant two-loop corrections to the Higgs t rilinear coupling in models with extended scalar sectors\, taking the spec ific example of a Two-Higgs-Doublet Model. I will illustrate the analytica l expressions with numerical examples and show that\, while they remain sm aller than their one-loop counterparts and do not modify significantly the non-decoupling effects observed at one loop\, the two-loop corrections ar e not entirely negligible – a typical size being 10-20% of the one-loop corrections.\n\nhttp://indico.fuw.edu.pl/contributionDisplay.py?contribId= 31&sessionId=5&confId=59 LOCATION:University of Warsaw 1.40 URL:http://indico.fuw.edu.pl/contributionDisplay.py?contribId=31&sessionId =5&confId=59 END:VEVENT BEGIN:VEVENT SUMMARY:The scalar potential of the 331 models: overview and prospect DTSTART;VALUE=DATE-TIME:20190913T143000Z DTEND;VALUE=DATE-TIME:20190913T144500Z DTSTAMP;VALUE=DATE-TIME:20260518T130805Z UID:indico-contribution-5-36@cern.ch DESCRIPTION:Speakers: COSTANTINI\, Antonio (INFN - Sezione di Bologna)\nWe discuss the scalar sector of a class of BSM models with enlarged gauge sy mmetry\, the so called 331 models. For all of them the gauge group is $SU( 3)_c\\times SU(3)_L \\times U(1)_X$ but\, depending on a parameter enterin g in the definition of the electric charge operator\, they allow different kind of new particles. Interestingly\, the scalar potential is universal for the 331 models. We give an overview of the analysis done on the scalar sector and some prospects on forthcoming results.\n\nhttp://indico.fuw.ed u.pl/contributionDisplay.py?contribId=36&sessionId=5&confId=59 LOCATION:University of Warsaw 1.40 URL:http://indico.fuw.edu.pl/contributionDisplay.py?contribId=36&sessionId =5&confId=59 END:VEVENT END:VCALENDAR