BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CERN//INDICO//EN BEGIN:VEVENT SUMMARY:Pseudo-Nambu-Goldstone dark matter: Examples of vanishing direct d etection cross section DTSTART;VALUE=DATE-TIME:20190913T130000Z DTEND;VALUE=DATE-TIME:20190913T131500Z DTSTAMP;VALUE=DATE-TIME:20260613T105710Z UID:indico-contribution-1-17@cern.ch DESCRIPTION:Speakers: KARAMITROS\, Dimitrios (NCBJ)\nWe consider cases whe re the dark matter-nucleon interaction is naturally suppressed. We explici tly show that extending the standard model scalar sector by a number of si nglets can lead to a vanishing direct detection cross section\, if some so ftly broken symmetries are imposed in the dark sector. In particular\, it is shown that if said symmetries are SU(2) [SU(N)] or U(1)×SN\, then the resulting Pseudo-Nambu-Goldstone bosons can constitute the dark matter of the Universe while naturally explaining the missing signal in nuclear reco il experiments.\n\nhttp://indico.fuw.edu.pl/contributionDisplay.py?contrib Id=17&sessionId=1&confId=59 LOCATION:University of Warsaw 0.06 URL:http://indico.fuw.edu.pl/contributionDisplay.py?contribId=17&sessionId =1&confId=59 END:VEVENT BEGIN:VEVENT SUMMARY:Possibility of dark matter detection at future e+e- colliders DTSTART;VALUE=DATE-TIME:20190913T124500Z DTEND;VALUE=DATE-TIME:20190913T130000Z DTSTAMP;VALUE=DATE-TIME:20260613T105710Z UID:indico-contribution-1-49@cern.ch DESCRIPTION:Speakers: Mr. IGLICKI\, Michał (University of Warsaw)\nI am g oing to discuss possibility of discovering dark matter particles at future e+e- colliders such as CLIC\, ILC or CEPC.\n Within several simple models \, I will try to answer the following questions:\n (1) Where\, in the para meter space\, is the region allowed by current experimental constraints\, that maximizes\n cross section for DM production at the colliders?\n ( 2) Could the signal of DM be statistically significant?\n (3) Would it be possible to determine the mass and spin of detected dark particle?\n\nhttp ://indico.fuw.edu.pl/contributionDisplay.py?contribId=49&sessionId=1&confI d=59 LOCATION:University of Warsaw 0.06 URL:http://indico.fuw.edu.pl/contributionDisplay.py?contribId=49&sessionId =1&confId=59 END:VEVENT BEGIN:VEVENT SUMMARY:Probing short-lifetime regime in FASER and SHiP detectors DTSTART;VALUE=DATE-TIME:20190913T131500Z DTEND;VALUE=DATE-TIME:20190913T133000Z DTSTAMP;VALUE=DATE-TIME:20260613T105710Z UID:indico-contribution-1-47@cern.ch DESCRIPTION:Speakers: Mr. JODŁOWSKI\, Krzysztof (National Centre for Nucl ear Research)\nOne of the most rapidly developing areas of research in par ticle physics nowadays is to look for new\, light\, extremely weakly-inter acting particles that could have escaped detection so far due to the lack of sufficient luminosity. A particularly promising experimental strategy i n these\, so-called\, intensity-frontier searches is to look for highly-di splaced decay signatures of light long-lived particles (LLPs) in a distant detector that is well-shielded from SM background. This approach is\, how ever\, limited to a certain lifetime regime of new particles that must rea ch the detector before decaying. In this talk\, we will discuss how this b asic constraint can be overcome in BSM models that go beyond the simplest scenarios. If more than one light new particle is present in the model\, a n additional secondary production of LLPs can happen right in front of the detector\, opening this way a new lifetime regime to be probed. We illust rate the prospects of such searches in future experiments\, including FASE R and proposed SHiP for a representative model with inelastic dark matter. \n\nhttp://indico.fuw.edu.pl/contributionDisplay.py?contribId=47&sessionId =1&confId=59 LOCATION:University of Warsaw 0.06 URL:http://indico.fuw.edu.pl/contributionDisplay.py?contribId=47&sessionId =1&confId=59 END:VEVENT BEGIN:VEVENT SUMMARY:Higgs LFV decays in the model for Dirac neutrino masses and dark m atter DTSTART;VALUE=DATE-TIME:20190913T123000Z DTEND;VALUE=DATE-TIME:20190913T124500Z DTSTAMP;VALUE=DATE-TIME:20260613T105710Z UID:indico-contribution-1-44@cern.ch DESCRIPTION:Speakers: ENOMOTO\, Kazuki (Osaka University)\nObserved tiny m asses of neutrinos suggest the existence of physics beyond the standard mo del. Many models and mechanisms are proposed to explain their smallness na turally. Some of them generate tiny neutrino masses by the effect of very heavy particles (seesaw mechanism)\, and others generate them by quantum e ffect of new particles whose masses are near EW scale. However\, it was sh own that most of these models are excluded if lepton flavor violating deca ys of the Higgs boson are observed in near future collider experiments wit hout observations of lepton flavor violating decays of the charged leptons . We made a new model which generates Dirac neutrino masses by quantum eff ect and is not excluded even if such decays are observed. Our model also h as a candidate of dark matter and can explain the observed relic abundance . In this talk\, I introduce our model and its features. ( arXiv:1904.070 39\, Phys. Rev. D100 (2019) no.1\, 015044)\n\nhttp://indico.fuw.edu.pl/con tributionDisplay.py?contribId=44&sessionId=1&confId=59 LOCATION:University of Warsaw 0.06 URL:http://indico.fuw.edu.pl/contributionDisplay.py?contribId=44&sessionId =1&confId=59 END:VEVENT BEGIN:VEVENT SUMMARY:A 3HDM with possible two dark matter candidates DTSTART;VALUE=DATE-TIME:20190913T120000Z DTEND;VALUE=DATE-TIME:20190913T121500Z DTSTAMP;VALUE=DATE-TIME:20260613T105710Z UID:indico-contribution-1-37@cern.ch DESCRIPTION:Speakers: Dr. ROJAS-CIOFALO\, Diana (University of Southampton )\nWe introduce a 3-Higgs Doublet Model (3HDM) with two Inert (or dark) (p seudo)scalar doublets and an active Higgs one\, hence termed I(2+1)HDM\, i n the presence of a discrete $Z_3$ acting upon the three doublet fields. A ssuming a maximally symmetric configuration of the parameters related to t he two dark doublets\, we show that such a construct yields a two-componen t Dark Matter (DM) model and the two DM candidates have opposite CP parity . Herein\, the most interesting solutions\, those that saturate the relic density and where contributions to the latter from the two DM candidates a re of similar magnitude\, are achieved when there is a high level of degen eracy in the (dark) charged sector. In order to probe this phenomenology\ , we have produced a set of benchmark scenarios in the I(2+1)HDM\, with th e invoked $Z_3$ symmetry\, which are further compliant with (in)direct sea rches for DM as well as other experimental data impinging on both the dark and Higgs sectors of the model\, chiefly\, in the form of Electro-Weak Pr ecision Observables (EWPOs)\, Standard Model (SM)-like Higgs boson measure ments at the Large Hadron Collider (LHC) and void searches for additional (pseudo)scalar states at the CERN machine and previous colliders.\n\nhttp: //indico.fuw.edu.pl/contributionDisplay.py?contribId=37&sessionId=1&confId =59 LOCATION:University of Warsaw 0.06 URL:http://indico.fuw.edu.pl/contributionDisplay.py?contribId=37&sessionId =1&confId=59 END:VEVENT BEGIN:VEVENT SUMMARY:Production of Purely Gravitational Vector Dark Matter DTSTART;VALUE=DATE-TIME:20190913T121500Z DTEND;VALUE=DATE-TIME:20190913T123000Z DTSTAMP;VALUE=DATE-TIME:20260613T105710Z UID:indico-contribution-1-43@cern.ch DESCRIPTION:Speakers: Ms. SOCHA\, Anna (University of Warsaw)\nMotivated b y the fact that so far all evidence for dark matter (DM) has gravitational origin\, we explore the possibility that the dark sector is coupled to th e standard model (SM) only gravitationally. We discuss two mechanisms that can contribute to the DM production - \\textit{non-perturbative} and \\te xtit{perturbative}. The first case refers to the particle production due t o time evolution of the background metric during inflation\, while the lat ter denotes a particle creation during reheating. Due to the fact that gra vitational interactions are extremely weak\, we investigate an option of a freeze-in in which SM particles slowly annihilate and that way produce pa irs of DM particles that never reach thermal equilibrium. The annihilation amplitudes are mediated by a single graviton exchange. Another possibilit y for DM production is annihilation triggered by higher-dimensional effect ive operators suppressed by the Planck mass scale $M_{Pl} $. In the case o f vector DM\, amplitudes generated by graviton exchange and those from eff ective operators are of the same order in powers of $M_{Pl}$. Moreover\, w e also provide for the possibility of the direct inflaton decay into DM an d compare all mentioned mechanisms.\n\nhttp://indico.fuw.edu.pl/contributi onDisplay.py?contribId=43&sessionId=1&confId=59 LOCATION:University of Warsaw 0.06 URL:http://indico.fuw.edu.pl/contributionDisplay.py?contribId=43&sessionId =1&confId=59 END:VEVENT END:VCALENDAR