Publications (29)
Relativistic covariance of quasipotential equations
V. Pascalutsa, J. A. Tjon
We argue that most of the relativistic 3-D (quasipotential) equations used in hadron physics are inconsistent with the discrete symmetries like charge conjugation and CPT, yielding…
Delta-baryon electromagnetic form factors in lattice QCD
C. Alexandrou, T. Korzec, G. Koutsou +6
We develop techniques to calculate the four Delta electromagnetic form factors using lattice QCD, with particular emphasis on the sub-dominant electric quadrupole form factor that…
Predictive powers of chiral perturbation theory in Compton scattering off protons
V. Lensky, V. Pascalutsa
We study low-energy nucleon Compton scattering in the framework of baryon chiral perturbation theory (BPT) with pion, nucleon, and (1232) degrees of freedom, up to and incl…
Magnetic Moments of Delta and Omega^- Baryons with Dynamical Clover Fermions
C. Aubin, K. Orginos, V. Pascalutsa +1
We calculate the magnetic dipole moment of the Delta(1232) and Omega^- baryons with 2+1-flavors of clover fermions on anisotropic lattices using a background magnetic field. This i…
Electromagnetic properties of baryons
T. Ledwig, J. Martin-Camalich, V. Pascalutsa +1
We discuss the chiral behavior of nucleon and Delta(1232) electromagnetic properties within the framework of a SU(2) covariant baryon chiral perturbation theory. Our one-loop calcu…
Quantization of an interacting spin-3/2 field and the Delta isobar
V. Pascalutsa
Quantization of the free and interacting Rarita-Schwinger field is considered using the Hamiltonian path-integral formulation. The particular interaction we study in detail is the…
Field theory of nucleon to higher-spin baryon transitions
V. Pascalutsa, R. G. E. Timmermans
We discuss the nucleon to higher-spin - and -resonance transitions by pions and photons. The higher-spin baryons are described by Rarita-Schwinger fields and, as we argue, t…
$γ^{*}NÎ$ Form Factors from a Relativistic Dynamical Model of Pion Electroproduction
G. L. Caia, V. Pascalutsa, J. A. Tjon +1
We obtain the electromagnetic form factors of the transition by analyzing recent pion-electroproduction data using a fully relativistic dynamical model. Special care is tak…
Predictions of chiral perturbation theory for Compton scattering off protons
V. Lensky, V. Pascalutsa
We compute the Compton scattering off the nucleons in the framework of manifestly covariant baryon chiral perturbation theory (BPT). The results for observables differ substant…
Chiral effective field theory of Delta(1232) and Compton scattering
V. Pascalutsa, D. R. Phillips
A new power-counting scheme for a chiral effective field theory that includes Delta degrees of freedom is briefly described and applied to the nucleon Compton scattering.
On the interaction of spin 3/2 particles
V. Pascalutsa
Lagrangian of a massive particle with spin 3/2 is considered in the Rarita-Schwinger formalism. We discuss implications of the contact- and the gauge-transformation on the physical…
Hadron structure and the limitations of phenomenological models in electromagnetic reactions
J. H. Koch, V. Pascalutsa, S. Scherer
The description of electromagnetic reactions at intermediate energies, such as pion electroproduction or (virtual) Compton scattering, traditionally starts from covariant tree-leve…
Relativistic quasipotential equations with u-channel exchange interactions
V. Pascalutsa, J. A. Tjon
Various quasipotential two-body scattering equations are studied at the one-loop level for the case of - and -channel exchange potentials. We find that the quasipotential equ…
Finite Volume Study of the Delta Magnetic Moments Using Dynamical Clover Fermions
C. Aubin, K. Orginos, V. Pascalutsa +1
We calculate the magnetic dipole moment of the Delta baryon using a background magnetic field on 2+1-flavors of clover fermions on anisotropic lattices. We focus on the finite volu…
A relativistic dynamical model for pi-N scattering
V. Pascalutsa, J. A. Tjon
We present a unitary relativistic quasi-potential model for describing the low-energy pion-nucleon interaction, based on the equal time Bethe-Salpeter equation. It preserves the co…
Delta electromagnetic form factors and quark transverse charge densities from lattice QCD
C. Alexandrou, T. Korzec, G. Koutsou +5
We discuss the techniques to extract the electromagnetic Delta form factors in Lattice QCD. We evaluate these form factors using dynamical fermions with smallest pion mass of about…
Limitations of the heavy-baryon expansion as revealed by a pion-mass dispersion relation
J. M. M. Hall, V. Pascalutsa
The chiral expansion of nucleon properties such as mass, magnetic moment, and magnetic polarizability are investigated in the framework of chiral perturbation theory, with and with…
Sum Rules for Magnetic Moments and Polarizabilities in QED and Chiral Effective-Field Theory
B. R. Holstein, V. Pascalutsa, M. Vanderhaeghen
We elaborate on a recently proposed extension of the Gerasimov-Drell-Hearn (GDH) sum rule which is achieved by taking derivatives with respect to the anomalous magnetic moment. The…
Pion-nucleon interaction in a covariant hadron-exchange model
V. Pascalutsa, J. A. Tjon
We develop a relativistic covariant and unitary description of the pion-nucleon interaction in a hadron-exchange model. The model is based on the solution of a dimensionally reduce…
The anomalous magnetic moment of the muon in the Standard Model: an update
R. Aliberti, T. Aoyama, E. Balzani +232
We present the current Standard Model (SM) prediction for the muon anomalous magnetic moment, , updating the first White Paper (WP20) [1]. The pure QED and electroweak contri…
Massive Spin 3/2 Electrodynamics
S. Deser, V. Pascalutsa, A. Waldron
We study the general non-minimally coupled charged massive spin 3/2 model both for its low energy phenomenological properties and for its unitarity, causality and degrees of freedo…
Electromagnetic moments of relativistic higher spin baryons
V. Pascalutsa
We point out a source of ambiguities in the measurements of the electromagnetic moments of spin-3/2 baryons which rely on relativistic Lagrangian models. An anambiguous relation be…
Electromagnetic moments of quasi-stable baryons
T. Ledwig, J. Martin-Camalich, V. Pascalutsa +1
We address electromagnetic properties of quasi-stable baryons in the context of chiral extrapolations of lattice QCD results. For particles near their decay threshold we show that…
Pion and photon induced reactions on the nucleon in a unitary model
O. Scholten, A. Yu. Korchin, V. Pascalutsa +1
We present a relativistic calculation of pion scattering, pion photoproduction and Compton scattering on the nucleon in the energy region of the \Del-resonance (upto 450 MeV photon…
The anomalous magnetic moment of the muon in the Standard Model
T. Aoyama, N. Asmussen, M. Benayoun +129
We review the present status of the Standard Model calculation of the anomalous magnetic moment of the muon. This is performed in a perturbative expansion in the fine-structure con…
The nucleon and Delta(1232) form factors at low momentum-transfer and small pion masses
T. Ledwig, J. Martin-Camalich, V. Pascalutsa +1
An expansion of the electromagnetic form factors of the nucleon and Delta(1232) in small momentum transfer and pion mass is performed in a manifestly-covariant EFT framework consis…
Correspondence of consistent and inconsistent spin-3/2 couplings via the equivalence theorem
V. Pascalutsa
The Rarita-Schwinger theory of free massive spin-3/2 field obeys the physical degrees of freedom counting, and one can distinguish ``consistent'' couplings which maintain this prop…
Analytic structure of theory using light-by-light sum rules
V. Pauk, V. Pascalutsa, M. Vanderhaeghen
We apply a sum rule for the forward light-by-light scattering process within the context of the quantum field theory. As a consequence of the sum rule a stringent causality…
Lorentz covariance of three-dimensional equations
V. Pascalutsa, J. A. Tjon
We show how the invariance under the charge conjugation and CPT symmetry, present in the Bethe-Salpeter equation, is lost in the reduction to certain relativistic three-dimensional…