A5008261031- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Physics of Superconductivity and Magnetism
- Black Holes and Theoretical Physics
- Particle Accelerators and Free-Electron Lasers
- Quantum Computing Algorithms and Architecture
- Medical Imaging Techniques and Applications
- Quantum and electron transport phenomena
- Superconducting Materials and Applications
- Magnetic confinement fusion research
- Matrix Theory and Algorithms
- Theoretical and Computational Physics
- Parallel Computing and Optimization Techniques
- Bayesian Methods and Mixture Models
- Markov Chains and Monte Carlo Methods
- Statistical Methods and Inference
- Approximation Theory and Sequence Spaces
- Spectroscopy and Quantum Chemical Studies
- Spectroscopy and Laser Applications
- Superconductivity in MgB2 and Alloys
- Advanced Numerical Methods in Computational Mathematics
- Ionosphere and magnetosphere dynamics
- IgG4-Related and Inflammatory Diseases
- Holomorphic and Operator Theory
Istituto Nazionale di Fisica Nucleare, Sezione di Roma I
2019-2024
European Organization for Nuclear Research
2022-2024
University of Rome Tor Vergata
2022-2024
University of Illinois Urbana-Champaign
2021-2024
University of Illinois System
2021-2024
Urbana University
2024
Instituto de Física de Cantabria
2022-2024
University of Utah
2024
Universidad de Granada
2024
Indiana University Bloomington
2024
We present a lattice-QCD calculation of the light-quark connected contribution to window observables associated with leading-order hadronic vacuum polarization anomalous magnetic moment muon, $a_\mu^{\mathrm{HVP,LO}}$. employ MILC Collaboration's isospin-symmetric QCD gauge-field ensembles, which contain four flavors dynamical highly-improved-staggered quarks lattice spacings between $a\approx 0.06$-$0.15$~fm and close-to-physical quark masses. consider several effective-field-theory-based...
We present new results for the amplitude ${A}_{2}$ a kaon to decay into two pions with isospin $I=2$: $\mathrm{Re}{A}_{2}=1.50(4{)}_{\text{stat}}(14{)}_{\text{syst}}\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}8}\text{ }\text{ }\mathrm{GeV}$; $\mathrm{Im}{A}_{2}=\ensuremath{-}6.99(20{)}_{\text{stat}}(84{)}_{\text{syst}}\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}13}\text{ }\mathrm{GeV}$. These were obtained from ensembles generated at physical quark masses (in limit)...
We extend the picture of $B$-meson decay constants obtained in lattice QCD beyond those $B$, ${B}_{s}$ and ${B}_{c}$ to give first full results for ${B}^{*}$, ${B}_{s}^{*}$ ${B}_{c}^{*}$. use improved nonrelativistic valence $b$ quark highly staggered (HISQ) action lighter quarks on gluon field configurations that include effect $u/d$, $s$ $c$ sea with $u/d$ masses going down physical values. For ratio vector pseudoscalar constants, we find ${f}_{{B}^{*}}/{f}_{B}=0.941(26)$,...
We present physical results for a variety of light hadronic quantities obtained via combined analysis three $2+1$ flavour domain wall fermion ensemble sets. For two our sets we used the Iwasaki gauge action with $\ensuremath{\beta}=2.13$ (${a}^{\ensuremath{-}1}=1.75(4)\text{ }\text{ }\mathrm{GeV}$) and $\ensuremath{\beta}=2.25$ (${a}^{\ensuremath{-}1}=2.31(4)\text{ lattice sizes ${24}^{3}\ifmmode\times\else\texttimes\fi{}64$ ${32}^{3}\ifmmode\times\else\texttimes\fi{}64$ respectively,...
We present a lattice QCD determination of the ${B}_{s}\ensuremath{\rightarrow}{D}_{s}\ensuremath{\ell}\ensuremath{\nu}$ scalar and vector form factors over full physical range momentum transfer. The result is derived from correlation functions computed using highly improved staggered quark (HISQ) formalism, on second generation MILC gluon ensembles accounting for up, down, strange charm contributions sea. calculate three spacing values an array unphysically light $b$-quark masses,...
We report on the first realistic ab initio calculation of a hadronic weak decay, that amplitude A(2) for kaon to decay into two π mesons with isospin 2. find ReA(2)=(1.436±0.063(stat)±0.258(syst))10(-8) GeV in good agreement experimental result and hitherto unknown imaginary part we ImA(2)=-(6.83±0.51(stat)±1.30(syst))10(-13) GeV. Moreover combining our ImA(2) values ReA(2), ReA(0), ε'/ε, obtain following value ratio ImA(0)/ReA(0) within standard model:...
We describe the computation of amplitude ${A}_{2}$ for a kaon to decay into two pions with isospin $I=2$. The results presented in [T. Blum et al., Phys. Rev. Lett. 108, 141601 (2012)] from an analysis 63 gluon configurations are updated 146 giving $\mathrm{Re}{A}_{2}=1.381(46{)}_{\mathrm{stat}}(258{)}_{\mathrm{syst}}{10}^{\ensuremath{-}8}\text{ }\text{ }\mathrm{GeV}$ and $\mathrm{Im}{A}_{2}=\ensuremath{-}6.54(46{)}_{\mathrm{stat}}(120{)}_{\mathrm{syst}}{10}^{\ensuremath{-}13}\text{...
There has been much speculation as to the origin of ΔI=1/2 rule (ReA0/ReA2≃22.5). We find that two dominant contributions ΔI=3/2, K→ππ correlation functions have opposite signs, leading a significant cancelation. This partial cancelation occurs in our computation ReA2 with physical quark masses and kinematics (where we reproduce experimental value A2) also for heavier pions at threshold. For ReA0, although do not results kinematics, zero momentum mπ≃420 MeV [ReA0/ReA2=9.1(2.1)] mπ≃330...
We compute the hadronic matrix elements of four-quark operators relevant for $$ {K}^0-{\overline{K}}^0 mixing beyond Standard Model. Our results are from lattice QCD simulations with n f = 2 + 1 flavours domain-wall fermion, which exhibit continuum-like chiral-flavour symmetry. The performed at two different values spacing (a ∼ 0.08 and a 0.11 fm) lightest unitary pion mass 300 MeV. For first time, full set is renormalised non-perturbatively through RI-SMOM schemes; detailed description...
We have performed the first $n_f = 2+1+1$ lattice QCD computations of properties (masses and decay constants) ground-state charmonium mesons. Our calculation uses HISQ action to generate quark-line connected two-point correlation functions on MILC gluon field configurations that include $u/d$ quark masses going down physical point, tuning $c$ mass from $M_{J/\psi}$ including effect quark's electric charge through quenched QED. obtain $M_{J/\psi}-M_{\eta_c}$ (connected) 120.3(1.1) MeV...
We use our lattice QCD computation of the $B_c\rightarrow J/\psi$ form factors to determine differential decay rate for semitauonic channel and construct ratio branching fractions $R(J/\psi) = \mathcal{B}(B_c^- \rightarrow J/\psi \tau^-\bar{\nu}_\tau)/\mathcal{B}(B_c^- \mu^-\bar{\nu}_\mu)$. find 0.2582(38)$ give an error budget. also extend relevant angular observables, which were recently suggested study lepton flavor universality violating effects in $B\rightarrow D^*\ell\nu$, $B_c...
We present the first lattice QCD determination of ${B}_{c}\ensuremath{\rightarrow}J/\ensuremath{\psi}$ vector and axial-vector form factors. These will enable experimental information on rate for ${B}_{c}$ semileptonic decays to $J/\ensuremath{\psi}$ be converted into a value ${V}_{cb}$. Our calculation covers full physical ${q}^{2}$ range decay uses nonperturbatively renormalized currents. use highly improved staggered quark (HISQ) action all valence quarks second generation MILC ensembles...
The Pauli strings appearing in the decomposition of an operator can be grouped into commuting families, reducing number quantum circuits needed to measure expectation value operator. We detail algorithm completely partition full set acting on any qubits minimal sets and we provide python code perform partitioning. partitioning method scales linearly with size it naturally provides a fast diagonalizing families gates. package that integrates qiskit, use this benchmark dense Hamiltonians, such...
Lattice QCD is notorious for its computational expense. Modern lattice simulations require large-scale resources to handle the high number of Dirac operator inversions used construct correlation functions. Machine learning (ML) techniques that can increase, at analysis level, information inferred from functions would therefore be beneficial. We apply supervised infer two-point different target masses. Our work proposes a new method separating data into training and bias correction subsets...
We present an update on the analysis of semileptonic $B\rightarrow D^{(*)}$ decays at non-zero recoil. Our computation employs $2 + 1 1$ FNAL-MILC ensembles with highly improved staggered quark (HISQ) action for sea and light valence quarks, while bottom is treated using clover in Fermilab interpretation. Simulations are performed across several lattice spacings, ranging approximately from $\sim 0.15$ fm to 0.06$ fm, various masses. will overview show some preliminary results form factors.
We compute the renormalisation factors (Z-matrices) of $\Delta F=2$ four-quark operators needed for Beyond Standard Model (BSM) kaon mixing. work with nf=2+1 flavours Domain-Wall fermions whose chiral-flavour properties are essential to maintain a continuum-like mixing pattern. introduce new RI-SMOM schemes, which we argue better behaved compared commonly-used corresponding RI-MOM one. find that, once converted MS, Z-factors computed through these schemes in good agreement but differ...
We determine the charm and strange quark masses in $\overline{\text{MS}}$ scheme, using $n_f=2+1+1$ lattice QCD calculations with highly improved staggered quarks (HISQ) RI-SMOM intermediate scheme to connect bare continuum renormalisation schemes. Our study covers analysis of systematic uncertainties from this method, including nonperturbative artefacts impact non-zero physical sea masses. find $m_c^{\overline{\text{MS}}}(3 \text{GeV}) = 0.9896(61)$ GeV $m_s^{\overline{\text{MS}}}(3...
We present lattice-QCD calculations of the hadronic form factors for semileptonic decays $D\to\pi\ell\nu$, $D\to K\ell\nu$, and $D_s\to K\ell\nu$. Our calculation uses highly improved staggered quark (HISQ) action all valence sea quarks includes $N_f=2+1+1$ MILC ensembles with lattice spacings ranging from $a\approx0.12$ fm down to $0.042$ fm. At most spacings, an ensemble physical-mass light is included. The HISQ allows be treated same relativistic light-quark action, allowing...
We calculate semileptonic form factors for the decays $B_c \to \eta_c \, l \nu$ and J/\psi over entire $q^2$ range, using a highly improved lattice quark action charm at several spacings down to $a=0.045~$fm. have two ways of treating $b$ quark: either with an $\cal O(\alpha_s)$ NRQCD formalism or by extrapolating heavy mass $m_h$ $m_b$ in relativistic formalism. Comparison approaches provides important cross-check methodologies QCD. Nonperturbative renormalisation currents theory also...
We give an accurate determination of the vector (electromagnetic) form factor, $F({Q}^{2})$, for a light pseudoscalar meson up to squared momentum transfer ${Q}^{2}$ values $6\text{ }\text{ }{\mathrm{GeV}}^{2}$ first time from full lattice QCD, including $u$, $d$, $s$ and $c$ quarks in sea at multiple spacing. Our results show good control discretization quark mass effects. study made valence but qualitative picture obtained applies also $\ensuremath{\pi}$ meson, relevant upcoming...
We show that the running of operators which mix under renormalization can be computed fully nonperturbatively as a product continuum step-scaling matrices. These matrices are obtained by taking ``ratio'' $Z$ at different energies in an RI-MOM type scheme for twisted boundary conditions essential ingredient. Our method allows us to relax bounds Rome-Southampton window. also explain why such is important view light quark physics program RBC-UKQCD Collaborations. To illustrate our method, using...
We compute the hadronic matrix elements of four-quark operators needed for study $K^0-{\bar K^0}$ mixing beyond Standard Model. have used $n_f=2+1$ flavours domain wall fermion (DWF) at two values lattice spacing ($a\approx0.08$ and $a\approx0.11\text{fm}$) with lightest unitary pion mass $\approx300\,\text{MeV}$. Renormalisation is performed non-perturbatively impact different intermediate momentum schemes investigated.
HPQCD Collaboration