In this talk, I'll cover recent experimental highlights from ATLAS and CMS, with an emphasis on the topics related to the physics of flavor and tests of violations of fundamental symmetries.
We study perturbative unitarity constraints on generic Yukawa interactions where the involved fields have arbitrary quantum numbers under an $\prod_i SU(N_i) \otimes U(1)$ group. We derive compact expressions for the bounds on the Yukawa couplings for the cases where the fields transform under the trivial, fundamental or adjoint representation of the various $SU(N)$ factors. We apply our...
The hints of Lepton Flavor Universality violation observed in semi-leptonic B decays, often referred to as the B-physics anomalies, are among the most interesting results reported by experiments in the last years. In this talk, I will discuss possible New Physics explanations of these phenomena, which generically imply large effects also in other observables, both at low and high energy. In...
I will discuss how the framework of asymptotic safety above the Planck scale can be employed to derive specific predictions for scalar leptoquark solution to the b to s flavor anomalies. The presence of an interactive UV fixed point in the system of gauge and Yukawa couplings imposes a set of boundary conditions at the Planck scale, which allows one to determine low-energy values of the...
I will talk about the possibility to address the recent result for the muon (g-2) with an axion-like particle (ALP) at the MeV scale. This particle promptly decays to electrons, which permits to account for the XENON1T excess as in arXiv:2011.08919 and to identify the ALP with the QCD axion of arXiv:1710.03764.
In the context of the recently measured non-leptonic decays $B_{d}\to K^{*0}\bar{K}^{*0}$ and $B_{s}\to K^{*0}\bar{K}^{*0}$ we analyse the anatomy of the $L_{K^{*0}\bar{K}^{*0}}$ observable that compares the longitudinal components of both decays. This observable is cleaner than the longitudinal polarisation fraction as it is afflicted only at subleading order in a $1/m_b$ expansion by the...
I will present the most minimal realistic SU(5) unification model to date and discuss its main predictions. The particle content of the model is built entirely out of the first five non-trivial representations of the lowest dimensionality. It consequentially connects the neutrino mass generation mechanism to the experimentally observed mass disparity between the down-type quarks and charged...
Hidden valley models are motivated by open questions in particle physics, notably the electroweak hierarchy and dark matter problems. They generically lead to “dark shower” signatures at the LHC, for which the effort to understand the hidden sector phenomenology and expand the experimental coverage is underway. For this purpose I present a complete theory of dark pions, broadly motivated by...
I'll describe how to use on-shell methods to calculate EFT Wilson coefficients, for example, those important for lepton violations. These methods allow to understand when these Wilson coefficients can be zero.
The ‘4321’ models are promising extensions of the SM that give rise to the $U_1$ vector leptoquark solution to the $B$-physics anomalies. Both the gauge and fermion sectors of these UV-constructions lead to a rich phenomenology currently accessible at high-energy colliders. In this talk we describe some of the main LHC signatures and extract exclusion limits using run-ll data. In addition, we...
Title: Light scalars from triplet Higgs fields: neutrinos, cosmology,
and colliders
Content:
SU(2) triplet Higgs fields coupling to leptons are a means to generate
Majorana masses for neutrinos. A priori the neutral scalar and
pseudoscalar components S and A could be light, as e.g. realised in
majoron models in which A is the Goldstone boson of spontaneously broken
lepton number....
Recent precise measurement of the electron anomalous magnetic moment (AMM) adds to the longstanding tension of the muon AMM and together strongly point towards physics beyond the Standard Model. An overview of new physics solutions to AMMs and their possible experimental probes will be presented.
We shall present a brand new study of the minimal renormalizable SO(10) Higgs model focusing on its perturbativity aspects. With an essentially complete grip on the one-loop corrections to its scalar spectrum one can identify the symmetry breaking chains featuring an intermediate SU(4)xSU(2)xU(1) symmetry as a practically unique option for a potentially realistic model building.
Flavour effects play an important role for leptogenesis in the type-I seesaw model with Majorana masses below the TeV scale. The requirement to simultaneously explain the light neutrino oscillation data and the baryon asymmetry of the universe impose constraints on the neutrino Yukawa couplings that can be probed at accelerator experiments. These predictions depend on the number of heavy...
I will start with a brief pedagogic review of the semiclassical method for determining the scaling dimensions of fixed-charge operators in conformal field theory with global symmetries and then introduce a general strategy to determine the relation between a given charge configuration and the associated operators for a given global symmetry group. I will demonstrate how, by varying the charge...
Ratios of nucleon decay rates between different channels can provide rich information about the specific GUT model realization in nature. To investigate this fingerprint in the context of SUSY GUTs and D=5 proton decay, we developed the software package SusyTCProton, which is an extension of the module SusyTC, itself to be used as a package of REAP. It takes the effective dimension 5 operators...
I shall discuss a possibility that dark matter is
a matter of parallel mirror sector which has the particle physics
identical to our particles. I discuss the possible interactions
between the ordinary and mirror particles, and in particular
baryon and lepton violating interactions and their role in
co-baryogenesis of matter and dark matter. I briefly discuss
also implications for neutron...
The increasing number of observed flavour anomalies claims for the investigation of different processes and the identification of suitable observables that can lead us to indirect discovery of NP. To this aim, I discuss a number of recent proposal of modes and observables that can discriminate SM from NP.
