Progetti di ricerca

Quantum Chromodynamics (QCD) is the fundamental field theory governing the strong interactions among particles. Understanding its non-perturbative dynamics from first principles necessitates numerical simulations on the lattice. This project seeks to measure the mesonic non-singlet screening masses projected onto the first… Leggi tutto non-zero Matsubara frequency across a previously-unexplored temperature range, from 1 GeV to 160 GeV, with sub-percent accuracy in the continuum limit. Besides its intrinsic physics significance, this endeavour will offer additional insights into the reliability of next-to-leading order perturbation theory up to the electroweak scale. In this initiative, we use the formulation of a thermal quantum theory in a moving reference frame. This approach has been extensively employed in recent publications that are setting the standard for Monte Carlo studies at very high temperatures. The outcomes of this study will illuminate various properties of the quark-gluon plasma. It expands the work of some of us on the static sector of mesonic screening masses [1] and the ongoing work on baryonic screening masses. Together with these works it will broaden our understanding of the hadronic screening spectrum in the high-temperature realm of QCD.

This project makes use of a novel approach for numerical lattice simulations of the strong nuclear force. Such simulations support an extensive experimental program in the search for new physics, and, as these searches continue, increased precision is required. Our approach… Leggi tutto of master field simulations enables larger volumes and finer lattice spacings, crucial for next-generation precision. The novelty is to employ a smaller number of significantly larger-volume quantum gauge fields, using spatial averaging of local observables. Accumulating statistics in this manner circumvents the infamous topology-freezing problem of conventional simulations and can further reduce the critical slowing down of algorithms near the continuum limit. With the 120 Mch requested here, we will generate data needed for the first master field calculations with varying lattice spacing. The fields will enable us to calculate the neutron electric dipole moment, charm-to-light semileptonic decays, and the inclusive rate R(e^+ e^- !’hadrons), each of which profit from the master field approach and are of direct importance for new physics searches. The approach is uniquely suited to exploit the full potential of large-scale HPC facilities as the huge problem size allows for tuning of the computational density to mask network communication and achieve excellent scaling performance.