Skip to main content
Location
ZOOM
Speaker
Anish Ghoshal, INFN Rome Tor Vergata, Italy
Host
Raut

Attempts to solve naturalness by having the weak scale as the only breaking of classical scale invariance in 4-dimensional Quantum Field Theories satisfy Total Asymptotic Freedom (TAF): the theory holds up to infinite energy, where all coupling constants flow to zero and is devoid of any Landau poles. Specifically we will discuss a fundamental field theory of the QCD axion in the totally asymptotically free (TAF) scenario, and the dynamics of the Peccei-Quinn (PQ) phase transition there-in.

Event Types
Location
ZOOM
Speaker
Tianjun Li, Texas A&M University
Host
Raut
Gauge coupling unification in the Supersymmetric Standard Models strongly implies the Grand Unified Theories (GUTs). With the grand desert hypothesis, we show that the supersymmetric GUTs can be probed at the future proton-proton (pp) colliders and the Hyper-Kamiokande experiment. For the GUTs with the GUT scale M_{GUT} smaller than 10^{16} GeV, we can probe the dimension-six proton decay via heavy gauge boson exchange at the Hyper-Kamiokande experiment.
Event Types
Location
ZOOM
Speaker
Aditya Hebbar, EPFL, Lausanne, Switzerland
Host
Raut
We review unitarity and crossing constraints on scattering amplitudes for particles with spin in four dimensional quantum field theories. As an application, we study two to two scattering of neutral spin 1/2 fermions in detail. Assuming Mandelstam analyticity of its scattering amplitude, we use the numerical S-matrix bootstrap method to estimate various non-perturbative bounds on quartic and cubic (Yukawa) couplings.
Event Types
Location
ZOOM
Speaker
Anupam Mazumdar, Van Swinderen Institute, University of Groningen Netherlands
Host
Raut
Understanding gravity in the framework of quantum mechanics is one of the great challenges in modern physics. Along this line, a prime question is to find whether gravity is a quantum entity subject to the rules of quantum mechanics. It is fair to say that there are no feasible ideas yet to test the quantum coherent behaviour of gravity directly in a laboratory experiment. Here, I will introduce an idea for such a test based on the principle that two objects cannot be entangled without a quantum mediator.
Event Types
Location
ZOOM
Speaker
Luca Di Luzio, DESY, Hamburg, Germany
Host
Raut
I discuss the construction of Grand Unified Theories (GUTs) featuring an accidental Peccei-Quinn symmetry. The emphasis is put on the possibility of predicting the axion mass.
Event Types
Location
ZOOM
Speaker
Darin E. Acosta, University of Florida and CERN
Host
Raut
Results will be presented on a recent search for the rare Higgs boson decay into a pair of muons by the CMS Collaboration (arXiv:2009.04363), using proton-proton collision data collected from the CERN Large Hadron Collider at a center-of-mass energy of 13 TeV. An excess of events is observed in data with a significance of 3.0 standard deviations compared to the null hypothesis, with an expected significance of 2.5 for the standard model Higgs boson, leading to the first evidence for a coupling of the Higgs boson to second generation fermions.
Event Types
Location
ZOOM
Speaker
Dr. Sudip Jana, Max-Planck Institute, Heidelberg
Host
Raut
The excess in electron recoil events reported recently by the XENON1T experiment may be interpreted as evidence for a sizable transition magnetic moment µeµ of Majorana neutrinos. We show the consistency of this scenario when a single component transition magnetic moment takes values µeµ ϵ (1.65 - 3.42) × 10-11 µB. Such a large value typically leads to unacceptably large neutrino masses. In this paper, we show that new leptonic symmetries can solve this problem and demonstrate this with several examples. We first revive and then propose a simplified model based on SU(2)H horizontal symmetry.
Event Types
Location
ZOOM
Speaker
Dr. Andrew Romero-Wolf, California Institute of Technology (CalTech)
Host
Raut

Cosmic ray nuclei arrive on Earth with energies of up to 3x10^20 eV (~50Joules), a macroscopic energy focused on a single sub-atomic particle. Despite nearly 100 years since their first observations, little is still known about the sources of these particles and the processes by which they acquire such tremendous energies. At rates of < 1 / km^2 / century, detecting these particles and extracting information from them requires detector arrays the size of small nations.

Event Types
Location
ZOOM
Speaker
Dr. Kaori Fuyuto, Los Alamos National Laboratory
Host
Raut
The observation of neutrino oscillation implies that neutrinos have mass. The quest to understand the origin of the neutrino mass lies at the forefront of particle and nuclear physics. Search for neutrinoless double beta decay is one of the primary probes to understand the neutrino nature. Its discovery implies lepton-number violation, confirming the Majorana neutrino mass which is realized by introducing sterile neutrinos. The theoretical approach requires somewhat complicated processes connecting fundamental interactions to those at hadronic and nuclear levels.
Event Types
Location
ZOOM
Speaker
Andreas Trautner, Max-Planck-Institute for Nuclear Physics, Heidelberg
Host
Raut
I will introduce arguably the simplest extension of the Standard Model that leads to renormalizable long-range vector-mediated neutrino self-interactions. Discussing bounds on the parameter space, we will see that there are unconstrained regions with four-neutrino interactions of a strength similar to effective models that have been suggested to resolve the cosmological Hubble tension. In a different region of parameter space, the excess in electron recoil events recently observed by XENON1T could be explained by the solar neutrino flux.
Event Types