Andrew Pochinsky
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View article: <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>B</mml:mi><mml:mo stretchy="false">→</mml:mo><mml:mi>ρ</mml:mi><mml:mo>ℓ</mml:mo><mml:mover accent="true"><mml:mrow><mml:mi>ν</mml:mi></mml:mrow><mml:mrow><mml:mo stretchy="false">¯</mml:mo></mml:mrow></mml:mover></mml:mrow></mml:math> Resonance Form Factors from <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>B</mml:mi><mml:mo stretchy="false">→</mml:mo><mml:mi>π</mml:mi><mml:mi>π</mml:mi><mml:mo>ℓ</mml:mo><mml:mover accent="true"><mml:mrow><mml:mi>ν</mml:mi></mml:mrow><mml:mrow><mml:mo stretchy="false">¯</mml:mo></mml:mrow></mml:mover></mml:mrow></mml:math> in Lattice QCD
Resonance Form Factors from in Lattice QCD Open
The decay B→ρℓν¯ is an attractive process for determining the magnitude of the smallest Cabibbo-Kobayashi-Maskawa matrix element, |Vub|, and can provide new insights into the origin of the long-standing exclusive-inclusive discrepancy in d…
View article: Nucleon electromagnetic form factors at large momentum from Lattice QCD
Nucleon electromagnetic form factors at large momentum from Lattice QCD Open
Proton and neutron electric and magnetic form factors are the primary characteristics of their spatial structure and have been studied extensively over the past half-century. At large values of the momentum transfer $Q^2$ they should revea…
View article: $B \to ρ\ell \barν$ resonance form factors from $B \to ππ\ell \barν$ in lattice QCD
$B \to ρ\ell \barν$ resonance form factors from $B \to ππ\ell \barν$ in lattice QCD Open
The decay $B \to ρ\ell \barν$ is an attractive process for determining the magnitude of the smallest CKM matrix element, $|V_{ub}|$, and can provide new insights into the origin of the long-standing exclusive-inclusive discrepancy in deter…
View article: Erratum: Variational study of two-nucleon systems with lattice QCD [Phys. Rev. D <b>107</b>, 094508 (2023)]
Erratum: Variational study of two-nucleon systems with lattice QCD [Phys. Rev. D <b>107</b>, 094508 (2023)] Open
View article: Quark orbital angular momentum in the proton from a twist-3 generalized parton distribution
Quark orbital angular momentum in the proton from a twist-3 generalized parton distribution Open
Quark orbital angular momentum in the proton is evaluated via a Lattice QCD calculation of the second Mellin moment of the twist-3 generalized parton distribution $\widetilde{E}_{2T} $ in the forward limit. The connection between this appr…
View article: The $B \rightarrow \pi \pi \ell \bar{\nu}$ transition
The $B \rightarrow \pi \pi \ell \bar{\nu}$ transition Open
$V_{ub}$ is the smallest and least known of all CKM matrix elements; it is currently determined primarily through the exclusive process $B\\to\\pi\\ell\\bar{\\nu}$, and additional channels to determine it are welcomed by the community. We …
View article: Quark orbital angular momentum in the proton from a twist-3 generalized parton distribution
Quark orbital angular momentum in the proton from a twist-3 generalized parton distribution Open
Quark orbital angular momentum in the proton is evaluated via a Lattice QCD calculation of the second Mellin moment of the twist-3 generalized parton distribution $\widetilde{E}_{2T} $ in the forward limit. The connection between this appr…
View article: Moments of nucleon unpolarized, polarized, and transversity parton distribution functions from lattice QCD at the physical point
Moments of nucleon unpolarized, polarized, and transversity parton distribution functions from lattice QCD at the physical point Open
The second Mellin moments ⟨x⟩ of the nucleon’s unpolarized, polarized, and transversity parton distribution functions are computed. Two lattice QCD ensembles at the physical pion mass are used: these were generated using a tree-level Syman…
View article: Lattice outlook on $B\toρ\ell\barν$ and $B\to K^\star \ell \ell$
Lattice outlook on $B\toρ\ell\barν$ and $B\to K^\star \ell \ell$ Open
Lattice Quantum Chromodynamics (QCD) has significantly contributed to our understanding of the CKM matrix through precise determinations of hadronic matrix elements. With advancements in theoretical methodologies and computational resource…
View article: Second Moments of Nucleon Unpolarized, Polarized, and Transversity Parton Distribution Functions from Lattice QCD at the Physical Point
Second Moments of Nucleon Unpolarized, Polarized, and Transversity Parton Distribution Functions from Lattice QCD at the Physical Point Open
The second Mellin moments $\langle x\rangle$ of the nucleon's unpolarized, polarized, and transversity parton distribution functions are computed. Two lattice QCD ensembles at the physical pion mass are used: these were generated using a t…
View article: Variational study of two-nucleon systems with lattice QCD
Variational study of two-nucleon systems with lattice QCD Open
The low-energy spectrum and scattering of two-nucleon systems are studied\nwith lattice quantum chromodynamics using a variational approach. A wide range\nof interpolating operators are used: dibaryon operators built from products of\nplan…
View article: Nucleon electromagnetic form factors at large momentum transfer from lattice QCD
Nucleon electromagnetic form factors at large momentum transfer from lattice QCD Open
Nucleon form factors at large momentum transfer are important for understanding the transition from nonperturbative to perturbative QCD and have been the focus of experiment and phenomenology. We calculate proton and neutron electromagneti…
View article: A lattice QCD study of the $B\to\pi\pi\ell\bar{\nu}$ transition
A lattice QCD study of the $B\to\pi\pi\ell\bar{\nu}$ transition Open
$V_{ub}$ is the smallest and least known of all CKM matrix elements; the community currently determines its magnitude primarily through the exclusive process $B\\to\\pi\\ell\\bar{\\nu}$. Here we present our progress toward a lattice QCD de…
View article: Transverse momentum-dependent parton distributions for longitudinally polarized nucleons from domain wall fermion calculations at the physical pion mass
Transverse momentum-dependent parton distributions for longitudinally polarized nucleons from domain wall fermion calculations at the physical pion mass Open
Previous Lattice QCD calculations of nucleon transverse momentum-dependent parton distributions (TMDs) focused on the case of transversely polarized nucleons, and thus did not encompass two leading-twist TMDs associated with longitudinal p…
View article: Moments of Parton Distributions Functions from Lattice QCD at the Physical Point
Moments of Parton Distributions Functions from Lattice QCD at the Physical Point Open
We present a Lattice QCD calculation of the second Mellin moments of the nucleon axial, vector and tensor parton distribution functions (PDFs). The calculation is performed at the physical pion mass with two different lattice spacings, and…
View article: A lattice QCD study of the $B \to ππ\ell \barν$ transition
A lattice QCD study of the $B \to ππ\ell \barν$ transition Open
$V_{ub}$ is the smallest and least known of all CKM matrix elements; the community currently determines its magnitude primarily through the exclusive process $B\toπ\ell\barν$. Here we present our progress toward a lattice QCD determination…
View article: Quark spin-orbit correlations in the proton
Quark spin-orbit correlations in the proton Open
Generalized transverse momentum-dependent parton distributions (GTMDs) provide a comprehensive framework for imaging the internal structure of the proton. In particular, by encoding the simultaneous distribution of quark transverse positio…
View article: Erratum: <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>π</mml:mi><mml:mi>γ</mml:mi><mml:mo stretchy="false">→</mml:mo><mml:mi>π</mml:mi><mml:mi>π</mml:mi></mml:mrow></mml:math> transition and the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>ρ</mml:mi></mml:math> radiative decay width from lattice QCD [Phys. Rev. D <b>98</b>, 074502 (2018)]
Erratum: transition and the radiative decay width from lattice QCD [Phys. Rev. D <b>98</b>, 074502 (2018)] Open
Received 21 December 2021DOI:https://doi.org/10.1103/PhysRevD.105.019902Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must mainta…
View article: Sparsening algorithm for multihadron lattice QCD correlation functions
Sparsening algorithm for multihadron lattice QCD correlation functions Open
Modern advances in algorithms for lattice QCD calculations have steadily driven down the resources required to generate gauge field ensembles and calculate quark propagators, such that, in cases relevant to nuclear physics, performing quar…
View article: <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>P</mml:mi></mml:math>-wave nucleon-pion scattering amplitude in the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="normal">Δ</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mn>1232</mml:mn><mml:mo stretchy="false">)</mml:mo></mml:math> channel from lattice QCD
-wave nucleon-pion scattering amplitude in the channel from lattice QCD Open
We determine the $\\Delta(1232)$ resonance parameters using lattice QCD and the Lüscher method. The resonance occurs in elastic pion-nucleon scattering with $J^P=3/2^+$ in the isospin $I = 3/2$, $P$-wave channel. Our calculation is perform…
View article: <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>I</mml:mi><mml:mo>=</mml:mo><mml:mn>1</mml:mn><mml:mo stretchy="false">/</mml:mo><mml:mn>2</mml:mn></mml:math> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>S</mml:mi></mml:math>-wave and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>P</mml:mi></mml:math>-wave <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>K</mml:mi><mml:mi>π</mml:mi></mml:math> scattering and the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>κ</mml:mi></mml:math> and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>K</mml:mi><mml:mo>*</mml:mo></mml:msup></mml:math> resonances from lattice QCD
-wave and -wave scattering and the and resonances from lattice QCD Open
We present a lattice-QCD determination of the elastic isospin-1/2 S-wave and P-wave Kπ scattering amplitudes as a function of the center-of-mass energy using L¨uscher's method. We perform global fits of K-matrix parametrizations to the fin…
View article: From Ji to Jaffe-Manohar orbital angular momentum in lattice QCD using a direct derivative method
From Ji to Jaffe-Manohar orbital angular momentum in lattice QCD using a direct derivative method Open
A lattice QCD approach to quark orbital angular momentum in the proton based on generalized transverse momentum-dependent parton distributions (GTMDs) is enhanced methodologically by incorporating a direct derivative technique. This improv…
View article: The rho radiative decay width from lattice QCD
The rho radiative decay width from lattice QCD Open
Pion photoproduction constitutes a prototype process, which allows for the study of the electro-weak decay of a QCD-unstable state, the $\rho$ resonance. It is also the most straightforward process to investigate such ( resonant ) transiti…
View article: Low-energy pion-nucleon scattering and the Δ resonance in lattice QCD
Low-energy pion-nucleon scattering and the Δ resonance in lattice QCD Open
We report on our investigation of low-energy pion-nucleon scattering from lattice QCD with Wilson type fermions. Our focus is on the isospin I = 3/2 channel, which couples to the Delta resonance. We discuss our calculations aiming at the e…
View article: Excited-state effects in nucleon structure on the lattice using hybrid interpolators
Excited-state effects in nucleon structure on the lattice using hybrid interpolators Open
It would be very useful to find a way of reducing excited-state effects in\nlattice QCD calculations of nucleon structure that has a low computational\ncost. We explore the use of hybrid interpolators, which contain a nontrivial\ngluonic e…
View article: Quark orbital angular momentum in the proton evaluated using a direct derivative method
Quark orbital angular momentum in the proton evaluated using a direct derivative method Open
Quark orbital angular momentum (OAM) in the proton can be calculated directly given a Wigner function encoding the simultaneous distribution of quark transverse positions and momenta. This distribution can be accessed via proton matrix ele…
View article: Nucleon axial, scalar, and tensor charges using lattice QCD at the physical pion mass
Nucleon axial, scalar, and tensor charges using lattice QCD at the physical pion mass Open
We report on lattice QCD calculations of the nucleon isovector axial, scalar, and tensor charges. Our calculations are performed on two 2+1-flavor ensembles generated using a 2-HEX-smeared Wilson-clover action at the physical pion mass and…
View article: Quark orbital angular momentum in the proton evaluated using a direct derivative method
Quark orbital angular momentum in the proton evaluated using a direct derivative method Open
Quark orbital angular momentum (OAM) in the proton can be calculated directly given a Wigner function encoding the simultaneous distribution of quark transverse positions and momenta. This distribution can be accessed via proton matrix ele…
View article: Calculating the $\rho$ radiative decay width with lattice QCD
Calculating the $\rho$ radiative decay width with lattice QCD Open
Pion photoproduction constitutes a prototype process, which allows for the study of the electro-weak decay of a QCD-unstable state, the ρ resonance. It is also the most straightforward process to investigate such (resonant) transition matr…
View article: Towards the P-wave nucleon-pion scattering amplitude in the $\Delta$ (1232) channel
Towards the P-wave nucleon-pion scattering amplitude in the $\Delta$ (1232) channel Open
We use lattice QCD and the L\\'uscher method to study elastic pion-nucleon scattering in the isospin $I = 3/2$ channel, which couples to the $\\Delta(1232)$ resonance. Our $N_f=2+1$ flavor lattice setup features a pion mass of $m_\\pi \\ap…