Conveners
Symmetries and New Physics
- Jens Erler
Symmetries and New Physics
- Misha Gorshteyn (JGU Mainz)
One of the current problems of the Standard Model of Elementary Particle Physics is the about three sigma failure of the first-row unitarity test of the Cabbibo-Kobayashi-Maskawa matrix. A long-standing goal of the study of free neutron beta decay is to better determine its upper left element ("Vud"). That is possible with measurements of the neutron lifetime and a correlation coefficient (the...
I review the current status of CKM unitarity tests in the top row. Recent developments in the SM radiative corrections to decays of free and bound neutrons, pions and kaons led to an apparent 2,5$\,\sigma$ deficit which, if confirmed, could point to the BSM physics.
The electric dipole moment (EDM) of elementary particles, serves as a powerful probe for new physics beyond the Standard Model (SM) and holds the potential to provide novel insights in unraveling the enigma of the matter-dominated universe. Hyperon EDM is a largely unexplored territory. In our recent paper (arxiv:2307.04364), we present a novel method that focuses on entangled...
The fundamental QCD symmetries at low energies and the new physics Beyond the Standard Model (BSM) are two frontiers in the contemporary physics. The Primakoff effect, a process of high-energy photo- or electro-production of mesons in the Coulomb field of a target offers a powerful experimental tool to explore both fundamental issues. A comprehensive Primakoff experimental program has been...
Studying Internal Pair Creation produced in the de-excitation of some light nuclei, the ATOMKI collaboration spotted an anomaly in the opening angle of the outgoing e+e− pair. This anomaly seems not related to any nuclear physics effects but due to the creation and subsequent decay of a new particle of mass approximately 17 MeV (X17). The existence of such state, if confirmed, will represent a...
he BESIII experiment is a symmetric e+e- collider operating at c.m. energy from 2.0 to 4.95 GeV. With the world’s largest data set of J/psi (10 Billion), psi(2S) (2.6 Billion), and about 25 fb-1 scan data from 3.77 to 4.95 GeV, we are able to search various dark sectors produced in e+e- annihilation and meson decay processes. In this talk, we report the search for dark photon candidate in e+e-...
An overview of the latest results from the NA62 experiment at CERN and future prospects will be presented.
The NA62 experiment collected the world's largest dataset of charged kaon decays in 2016-2018, leading to the first measurement of the branching ratio of the ultra-rare $K^+ \rightarrow \pi^+ \nu \bar\nu$ decay, based on 20 candidates. This provides evidence for the very rare $K^+...
on behalf of the NA64 collaboration
The NA64 experiment at CERN searches for dark matter produced in both visible and invisible decays of sub-GeV vector mediators, such as the dark photon $A'$. During the years 2016 – 2022, $A'$ production from electrons impinging on a target $Z$ via the reaction $e^-Z \rightarrow e^-ZA'$ and subsequent decays $A' \rightarrow \chi\chi$, $\chi$ being a dark...
