Alberto Ramos

High-precision calculation of the quark–gluon coupling from lattice QCD

Mattia Dalla Brida, Roman Höllwieser, Francesco Knechtli, Tomasz Korzec et autres

Abstract The outcomes of modern particle physics experiments, such as proton–proton collisions at the Large Hadron Collider at CERN (European Organization for Nuclear Research), depend crucially on the precise description of the scattering processes in terms of the fundamental forces. Among all …

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Lattice investigation of custodial two-Higgs-doublet model at weak quartic couplings

Guilherme Catumba, Atsuki Hiraguchi, George Wei-Shu Hou, Karl Jansen et autres

A bstract The SU(2)–gauged custodial two-Higgs-doublet model, which shares the same global-symmetry properties with the standard model, is studied non-perturbatively on the lattice. The additional Higgs doublet enlarges the scalar spectrum and opens the possibility for spontaneous breaking of the global symmetry. …

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Stochastic automatic differentiation and the signal to noise problem

Guilherme Catumba, Alberto Ramos

Abstract Lattice Field theory allows to extract properties of particles in strongly coupled quantum field theories by studying Euclidean vacuum expectation values. When estimated from numerical Monte Carlo simulations these are typically affected by the so called Signal to Noise problem: both …

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The strength of the interaction between quarks and gluons

Alberto Ramos, Mattia Dalla Brida, Roman Höellwieser, Francesco Knechtli et autres

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Lattice study of SU(2) gauge theory coupled to four adjoint Higgs fields

Guilherme Catumba, Atsuki Hiraguchi, George Wei-Shu Hou, Karl Jansen et autres

Gauge theories with matter fields in various representations play an important role in different branches of physics. Recently, it was proposed that several aspects of the pseudogap phase of cuprate superconductors near optimal doping may be explained by an emergent SU ( …

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Strong C P problem in the quantum rotor

David Albandea, Guilherme Catumba, Alberto Ramos

Recent studies have claimed that the strong C P problem does not occur in QCD, proposing a new order of limits in volume and topological sectors when studying observables on the lattice. In order to shed light on this issue, we study …

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FLAG Review 2024

Yasumichi Aoki, Thomas Blum, Sara Collins, Luigi Del Debbio et autres

The proton-to-electron mass ratio μ is one of the most precisely measured dimensionless constants, yet the Standard Model provides no structural explanation for its value. Version 4 is fully grounded in the Operatiology axiom system {A1, A2, A4}, under which the unique …

Stochastic automatic differentiation for Monte Carlo processes

Guilherme Catumba, Alberto Ramos, Bryan Zaldívar

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The strong coupling constant: state of the art and the decade ahead

D. d’Enterria, S. Kluth, G Zanderighi, César Ayala et autres

Abstract Theoretical predictions for particle production cross sections and decays at colliders rely heavily on perturbative Quantum Chromodynamics (QCD) calculations, expressed as an expansion in powers of the strong coupling constant α S . The current O ( 1 % ) uncertainty …

The dependence of observables on action parameters

Guilherme Catumba, Alberto Ramos, Bryan Zaldívar

Many applications in Lattice field theory require to determine the Taylor series of observables with respect to action parameters. A primary example is the determination of electromagnetic corrections to hadronic processes. We show two possible solutions to this general problem, one based …

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A non-perturbative determination of $b_{\rm g}$

Stefan Sint, Mattia Dalla Brida, Francesco Knechtli, Tomasz Korzec et autres

Close to the continuum limit, lattice QCD with mass-degenerate Wilson quarks can be described by Symanzik's effective continuum action, which contains the dimension 5 operator, $m {\rm tr}(F_{\mu\nu}F_{\mu\nu})$. Its effect can be eliminated by an O($a m_{\rm q}$) rescaling of the bare …

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Strong CP problem in the quantum rotor

David Albandea, Guilherme Catumba, Alberto Ramos

Recent studies have claimed that the strong $CP$ problem does not occur in QCD, proposing a new order of limits in volume and topological sectors when studying observables on the lattice. In order to shed light on this issue, we study the …