Fri·Nov 11, 2022Friday·November 11, 2022

1. 01*

   Three-body resonances in the ${\phi }^4$ theory

   Marco Garofalo🇩🇪 · Maxim Mai🇺🇸 · Fernando Romero-López🇺🇸 · Akaki Rusetsky🇩🇪 · Carsten Urbach🇩🇪

   We study the properties of three-body resonances using a lattice complex scalar ${\phi }^4$ theory with two scalars, with parameters chosen such that one heavy particle can decay into three light ones. We determine the two- and three-body spectra for several lattice volumes using variational techniques, and then analyze them with two versions of the three-particle finite-volume formalism: the Relativistic Field Theory approach and the Finite-Volume Unitarity approach. We find that both methods provide an equivalent description of the energy levels, and we are able to fit the spectra using simple parametrizations of the scattering quantities. By solving the integral equations of the corresponding three-particle formalisms, we determine the pole position of the resonance in the complex energy-plane and thereby its mass and width. We find very good agreement between the two methods at different values of the coupling of the theory.

   hep-latJHEP(2023)·35 citations
2. 02*

   Stout Smearing on a Quantum Computer

   Erik J. Gustafson🇺🇸

   Smearing of gauge-field configurations in lattice field theory improves the results of lattice simulations by suppressing high energy modes from correlation functions. In quantum simulations, high kinetic energy eigenstates are introduced when the time evolution operator is approximated such as Trotterization. While improved Trotter product formulae exist to reduce the errors, they have diminishing accuracy returns with respect to resource costs. Therefore having an algorithm that has fewer resources than an improved Trotter formula is desirable. In this work I develop a representation agnostic method for quantum smearing and show that it reduces the coupling to high energy modes in the discrete nonabelian gauge theory $D_4$

   hep-latquant-ph8 citations
3. 03*

   The proton radius and its relatives -- much ado about nothing?

   Ulf-G. Meißner🇩🇪

   I summarize the dispersion-theoretical analysis of the nucleon electromagnetic form factors. Special emphasis is given on the extraction of the proton charge radius and its relatives, the proton magnetic radius as well as the neutron magnetic radius. Some recent work on the hyperfine splitting in leptonic hydrogen and on radiative corrections to muon-proton scattering is also discussed. Some views on future studies are given.

   ↳ hep-phhep-exhep-latnucl-ex+1J.Phys.Conf.Ser.(2023)·9 citations
4. 04*

   Snowmass Theory Frontier Report

   N. Craig · C. Csáki · A. X. El-Khadra · Z. Bern · R. Boughezal · S. Catterall · Z. Davoudi · A. de Gouvêa · P. Draper · P. J. Fox · D. Green · D. Harlow and 29 other authors

   This report summarizes the recent progress and promising future directions in theoretical high-energy physics (HEP) identified within the Theory Frontier of the 2021 Snowmass Process.

   ↳ hep-phastro-ph.COgr-qchep-lat+114 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.