Particle Theory Seminar

It is organized by the Theory Group of the Laboratory for Particle Physics (LTP) at PSI.

Contact: Giovanni Marco Pruna,, WHGA/132, Tel +41 56 310 3660.

The next seminar will take place on

Friday, 22 September 2017 at 15:00 in room WHGA/121

Lorenzo Calibbi (ITP Beijing)

Two ways of connecting flavour to Dark Matter: flavour portals and axiflavon

Abstract: In this seminar, I will first review the main features of models of fermion masses and mixing based on new symmetries of flavour. I will then introduce dark matter (DM) as a fermion singlet under the Standard Model (SM) gauge group that is however charged under the flavour symmetry. Interactions between DM and SM particles are then only mediated by the scalar fields that spontaneously break the flavour symmetry, the so-called flavons. In the case of gauged flavour symmetries, the interactions are also mediated by the new flavour gauge bosons. I will discuss the construction and the generic features of this class of models, as well as the phenomenology of an explicit example. In the second part of the seminar, I will show that solving the flavour problem of the SM with a simple U(1) flavour symmetry naturally leads to an axion that solves the strong CP problem and constitutes a viable DM candidate. In this framework, the ratio of the axion mass and its coupling to photons is related to the SM fermion masses and predicted within a small range, as a direct result of the observed hierarchies in quark and charged lepton masses. The same hierarchies determine the axion couplings to fermions, making the framework very predictive and experimentally testable by future axion and precision flavour experiments.

The following list contains the talks scheduled in the past five years:
Date Speaker Title Institute Place
07.09.17 R. Mandal Rare B decays and new physics IMS Chennai Thursday 15:00, WHGA/121
11.07.17 M. Blanke Simplified models of quark-flavoured dark matter beyond MFV ITP Karlsruhe Tuesday 15:00, WHGA/121
12.06.17 C. Frugiuele Atomic probes of new physics Weizmann Inst. Monday 16:00, WBWA/210
26.01.17 D. Stöckinger Higgs boson mass: the quest for precise predictions in SUSY models TU Dresden Thursday 11:30, WBGB/021
16.12.16 T. Geib Conversion of Bound Muons: Lepton Flavour and Number Violation MPI Munich Friday 11:00, WHGA/121
28.11.16 O. Fischer Testing the origin of neutrino masses at future high-energy colliders Basel Monday 11:00, WBGB/21
14.11.16 A. Greljo R(D*) anomaly and its implications for LHC UZH Monday 11:00, WHGA/121
19.11.14 G. Luisoni NLO Computations with GoSam: from LHC to muon decay MPI Munich Wednesday 10:30, WBGB/020
11.02.14 C. Ji Nuclear polarization effects in muonic atoms TRIUMF Tuesday 11:30, WBGB/021
03.12.13 M. Pruna The impact of dimension 6 effective vertices in LFV muonic transitions PSI Tuesday 11:30, WBGB/021
26.11.13 T. Robens Higgs Singlet extension in the light of the LHC discovery TU Dresden Tuesday 11:30, WBGB/021
15.10.13 R. Gröber Vector-like fermions in Composite Higgs Models ITP Karlsruhe Thursday 11:30, WBGB/020
17.09.13 J. Diaz Lorentz symmetry breaking: phenomenology and experiments Indiana Tuesday 11:30, WBGB/019
30.07.13 M. Pospelov Low-energy constraints on muon and tau neutral current parity-violating processes Perimeter Tuesday 11:30, WBGB/019
13.12.12 S. Plätzer Matching, merging and all that DESY Thursday 11:30, WBGB/021
06.12.12 A. Carmona New Production Mechanism for Composite Higgs at the LHC ETHZ Thursday 11:30, WBGB/021
22.10.12 E. Popenda Korrekturen nächst-führender Ordnung in supersymmetrischer QCD zur Squark-Paarproduktion am LHC Karlsruhe/PSI Monday 14:30, WBGB/021
11.09.12 L. Hosekova Corrections to the Production of Two Leptons Pairs via Vector-Boson Fusion at LHC Valencia Tuesday 11:30, WBGA/B16