Discussing quantum theory foundations, von Neumann noted that the measurement process should not be regarded in terms of a time evolution [1]. The reason for such a claim is the insurmountability of a gap between reversibly and irreversibly evolving systems in physics. The time operator formalism that goes beyond the gap is an adequate framework for elucudation of the measurement problem [2]....
We consider new instantons that appear as a result of accounting for quantum fluctuations. These fluctuations naturally regularize the O(4) singular solutions abandoned in Coleman's theory. In the previous works we showed how new instantons modify the widely accepted picture of false vacuum decay in two particular examples of exactly solvable potentials. Here we generalize our consideration to...
The status of experimental hints for sterile neutrinos is discussed. In particular, a critical analysis is presented of the Neutrino-4 claim of the observation of sterile neutrinos with a very large difference in the mass square with the known neutrinos. The consequences of the new measurements at Kurchatov Institute of beta spectra from 235U and 239Pu isotopes undergoing...
NUSES is a new space mission project promoted by the Gran Sasso Science Institute (GSSI) in collaboration with Thales Alenia Space and the italian Istituto Nazionale Fisica Nucleare (INFN). The NUSES satellite will host two payloads, Terzina and Zirè, aiming to explore new technological and observational approaches in the study of cosmic radiation spanning from very low to high energies. ...
The Solenoidal Tracker at RHIC (STAR) experiment utilizes its excellent mid-rapidity tracking and particle identification capabilities, and the fine granularity of its electromagnetic calorimeter, to study the emergent properties of Quantum Chromodynamics (QCD). The STAR heavy-ion program at vanishingly small baryon density is aimed to address questions about the quantitative properties of the...
A puzzling enhancement of soft photons has been observed since the 80s in data for small-$k_T$ direct photons, associated with multi-particle hadron production and with jets in $e^+$-$e^-$ annihilation. As a reference for comparison was used the "bremsstrahlung" mechanism, assuming radiation of photons by the produced charged particles.
This model usually presented as a generalization of the...
The worldline formalism provides an alternative to Feynman diagrams that allows one to derive integral representations for effective actions and amplitudes in field theory that to some extent share the superior organzation of string amplitudes. After a general discussion of the advantages of the formalism with respect to gauge invariance and its ability to combine contributions from...
Machine learning (ML) is pushing through boundaries in computational physics.
Jet physics, with it's large and detailed dataset, is particularly well suited.
In this talk will cover the work done in https://arxiv.org/abs/2104.01972
on the application of an unusual ML technique, Spectral Clustering, to jet formation.
Spectral clustering differers from much of ML as it has no "black-box"...
The PiHe collaboration of the Paul Scherrer Institute (PSI) have carried out laser spectroscopy of long-lived three-body pionic helium atoms made of a $^4$He nucleus, an electron, and a negative pion. Sub-nanosecond laser pulses excited a transition between a pionic state of principal and orbital angular momentum quantum number combinations $(n,\ell)=(17,16)$$\rightarrow$$(17,15)$. This may...
While the field of nuclear astrophysics has recently been a burgeoning area of study and research, there is still a significant portion of information regarding the topic that is not known to science. In particular, while certain foundations of the subject area seem plausible, there is not currently any proof that helium fusion is a key component that drives nuclear astrophysics. In this work,...
Model-independent searches for physics beyond the Standard Model typically focus on invariant masses of two objects (jets, leptons or photons). In this study we explore opportunities for similar model-agnostic searches in multi-body invariant masses. In particular, we focus on the situations when new physics can be observed in a model-independent way in three- and four-body invariant masses...
We examine nature of longitudinal electrical conductivity in magnetized plasma considering dynamical screening in the context of binary neutron star merger (BNS). We consider strongly quantizing domain for significant thermodynamic contribution in the calculation of transport coefficient. We solve Boltzmann equation in presence of magnetic field to obtain dissipative component of the...
This talk will be focused on the latest B-physics results from the CMS experiment at the LHC at CERN.
