A5091154136- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Black Holes and Theoretical Physics
- Atomic and Subatomic Physics Research
- Superconducting Materials and Applications
- Computational Physics and Python Applications
- Cosmology and Gravitation Theories
- Nuclear physics research studies
- Medical Imaging Techniques and Applications
- Analytical Chemistry and Chromatography
- Quantum Mechanics and Applications
- Particle Accelerators and Free-Electron Lasers
- Neutrino Physics Research
- Opinion Dynamics and Social Influence
- Solar and Space Plasma Dynamics
- Spectral Theory in Mathematical Physics
- Distributed and Parallel Computing Systems
- Contact Mechanics and Variational Inequalities
- Numerical methods for differential equations
- Simulation Techniques and Applications
- Electromagnetic Simulation and Numerical Methods
- Quantum Computing Algorithms and Architecture
- Dark Matter and Cosmic Phenomena
- International Science and Diplomacy
University of Southampton
2014-2024
Columbia University
2014-2024
University of Connecticut
2014-2024
Brookhaven National Laboratory
2014-2024
Peking University
2016-2024
Collaborative Innovation Center of Quantum Matter
2016-2024
Istituto Nazionale di Fisica Nucleare, Sezione di Roma Tre
2019-2022
Istituto Nazionale di Fisica Nucleare, Sezione di Roma I
1993-2019
University of Rome Tor Vergata
2019
Roma Tre University
2019
We show that, in the heavy quark limit, hadronic matrix elements that enter $B$ meson decays into two light mesons can be computed from first principles, including ``nonfactorizable'' strong interaction corrections, and expressed terms of form factors light-cone distribution amplitudes. The conventional factorization result follows limit when both power corrections $1/{m}_{b}$ radiative ${\ensuremath{\alpha}}_{s}$ are neglected. compute order- to...
In this paper, for the first time to our knowledge, a method is proposed compute electromagnetic effects in hadronic processes, such as decays, using lattice simulations. The can be applied, example, leptonic and semileptonic decays of light or heavy pseudoscalar mesons. For these quantities presence infrared divergences intermediate stages calculation makes procedure much more complicated than case spectrum, which calculations already exist. order physical widths, diagrams with virtual...
The leading electromagnetic (e.m.) and strong isospin-breaking corrections to the $\pi^+ \to \mu^+ \nu[\gamma]$ $K^+ leptonic decay rates are evaluated for first time on lattice. results obtained using gauge ensembles produced by European Twisted Mass Collaboration with $N_f = 2 + 1 1$ dynamical quarks. relative leading-order e.m.~and 1.53(19)\% $\pi_{\mu 2}$ decays 0.24(10)\% $K_{\mu decays. Using experimental values of updated lattice QCD pion kaon constants in isosymmetric QCD, we find...
Abstract Kaon physics is at a turning point – while the rare-kaon experiments NA62 and KOTO are in full swing, end of their lifetime approaching future experimental landscape needs to be defined. With HIKE, KOTO-II LHCb-Phase-II on table under scrutiny, it very good moment time take stock contemplate about opportunities these theoretical developments provide for particle coming decade beyond. This paper provides compact summary talks discussions from Kaons@CERN 2023 workshop, held September CERN.
We develop and demonstrate techniques needed to compute the long distance contribution ${K}_{L}\ensuremath{-}{K}_{S}$ mass difference, $\ensuremath{\Delta}{M}_{K}$, in lattice QCD carry out a first, exploratory calculation of this fundamental quantity. The is performed on $2+1$ flavor, domain wall fermion, ${16}^{3}\ifmmode\times\else\texttimes\fi{}32$ configurations with 421 MeV pion an inverse spacing $1/a=1.73\text{ }\text{ }\mathrm{GeV}$. include only current-current operators drop all...
We present a non-perturbative lattice calculation of the form factors which contribute to amplitudes for radiative decays $P\to \ell \bar \nu_\ell \gamma$, where $P$ is pseudoscalar meson and $\ell$ charged lepton. Together with determination corrections processes \nu_\ell$ due exchange virtual photon, this allows accurate predictions at $O(\alpha_{em})$ be made leptonic decay rates mesons ranging from pion $D_s$ meson. are able separate unambiguously non-pertubatively point-like...
We present the first results for ${K}_{l3}$ form factor from simulations with $2+1$ flavors of dynamical domain wall quarks. Combining our result, namely, ${f}_{+}(0)=0.964(5)$ latest experimental decays leads to $|{V}_{us}|=0.2249(14)$, reducing uncertaintity in this important parameter. For $O({p}^{6})$ term chiral expansion we obtain $\ensuremath{\Delta}f=\ensuremath{-}0.013(5)$.
We report a direct lattice calculation of the $K$ to $\ensuremath{\pi}\ensuremath{\pi}$ decay matrix elements for both $\ensuremath{\Delta}I=1/2$ and $3/2$ amplitudes ${A}_{0}$ ${A}_{2}$ on $2+1$ flavor, domain wall fermion, ${16}^{3}\ifmmode\times\else\texttimes\fi{}32\ifmmode\times\else\texttimes\fi{}16$ lattices. This is complete in which all contractions required ten, four-quark operators are evaluated, including disconnected graphs no quark line connects initial kaon final two-pion...
We report a first, complete lattice QCD calculation of the long-distance contribution to K^{+}→π^{+}νν[over ¯] decay within standard model. This is second-order weak process involving two four-Fermi operators that highly sensitive new physics and being studied by NA62 experiment at CERN. While much this comes from perturbative, short-distance physics, there part, perhaps as large planned experimental error, which involves nonperturbative phenomena. The presented here, with unphysical quark...
We review the status of RBC-UKQCD collaborations’ computations K L - S mass difference. After a brief discussion theoretical framework which had been developed previously by collaboration, we describe our latest computation, performed at physical quark masses, and present preliminary result m = (5.5 ± 1.70) × 10 -12 MeV.
We determine, by means of lattice QCD calculations, the local form factors describing <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:msub><a:mi>B</a:mi><a:mi>s</a:mi></a:msub><a:mo stretchy="false">→</a:mo><a:msup><a:mi>μ</a:mi><a:mo>+</a:mo></a:msup><a:msup><a:mi>μ</a:mi><a:mo>−</a:mo></a:msup><a:mi>γ</a:mi></a:math> decay, in so-called electroquenched approximation. For this analysis we make use gauge configurations produced ETM Collaboration with <d:math...
The rare kaon decays $K\ensuremath{\rightarrow}\ensuremath{\pi}{\ensuremath{\ell}}^{+}{\ensuremath{\ell}}^{\ensuremath{-}}$ and $K\ensuremath{\rightarrow}\ensuremath{\pi}\ensuremath{\nu}\overline{\ensuremath{\nu}}$ are flavor changing neutral current (FCNC) processes hence promising channels with which to probe the limits of standard model look for signs new physics. In this paper we demonstrate feasibility lattice calculations decay amplitudes long-distance contributions very significant....
The rare kaon decays $K\to\pi\nu\bar{\nu}$ are strongly suppressed in the standard model and widely regarded as processes which new phenomena, not predicted by model, may be observed. Recognizing such phenomena requires precise prediction for braching ratio of with controlled uncertainty both short-distance long-distance contributions. In this work we demonstrate feasibility lattice QCD calculation contribution to emphasis on $K^+\to\pi^+\nu\bar{\nu}$. Our methodology covers $W$-$W$...