scholarly journals Pion loop contribution to the electromagnetic pion charge radius

1995 ◽  
Author(s):  
C D Roberts ◽  
A Bender ◽  
R Alkofer
Keyword(s):  
Charge Radius ◽  
Loop Contribution ◽  
Pion Loop

scholarly journals PION LOOP CONTRIBUTION TO THE ELECTROMAGNETIC PION CHARGE RADIUS

1995 ◽  
Vol 10 (23) ◽  
pp. 3319-3342 ◽  
Author(s):  
REINHARD ALKOFER ◽  
AXEL BENDER ◽  
CRAIG D. ROBERTS
Keyword(s):  
Field Theory ◽  
Charge Radius ◽  
Chiral Limit ◽  
Equation Approach ◽  
Loop Contribution ◽  
Quark Core ◽  
Model Field ◽  
The Core ◽  
Pion Loop

A phenomenological Dyson-Schwinger equation approach to QCD, formalized in terms of a QCD-based model field theory, is used to calculate the electromagnetic charge radius of the pion. The contributions from the core of dressed quarks and the pion loop are identified and compared. It is shown explicitly that the divergence of the charge radius in the chiral limit is due to the pion loop but that at mπ=0.14 GeV this loop contributes less than 15% to [Formula: see text], i.e. the dressed quark core is the dominant determining characteristic for the pion.

scholarly journals On the Hadronic light-by-light contribution to the muon g – 2

2018 ◽  
Vol 179 ◽  
pp. 01001 ◽  
Author(s):  
Johan Bijnens
Keyword(s):  
Magnetic Moment ◽  
Anomalous Magnetic Moment ◽  
Muon Anomalous Magnetic Moment ◽  
Model Calculations ◽  
Loop Contribution ◽  
Pion Loop ◽  
Pseudo Scalar

This talk is about the hadronic light-by-light contribution to the muon anomalous magnetic moment, mainly our old work but including some newer results as well. It concentrates on the model calculations. Most attention is paid to pseudo-scalar exchange and the pion loop contribution. Scalar, a1-exchange and other contributions are shortly discussed as well. For the π0-exchange a possible large cancellation between connected and disconnected diagrams is expected.

scholarly journals Pion loop contribution toρ-ωmixing and mass splitting

1997 ◽  
Vol 55 (3) ◽  
pp. 1477-1491 ◽  
Author(s):  
K. L. Mitchell ◽  
P. C. Tandy
Keyword(s):  
Mass Splitting ◽  
Loop Contribution ◽  
Pion Loop

The sign and value of the neutron mean squared intrinsic charge radius

1999 ◽  
Vol 30 (1) ◽  
pp. 29 ◽  
Author(s):  
Yu. A. Aleksandrov
Keyword(s):  
Charge Radius

Infrared finiteness of the two-loop correction to the Chern–Simons term in the Yang–Mills–Chern–Simons theory

1995 ◽  
Vol 73 (5-6) ◽  
pp. 344-348 ◽  
Author(s):  
Yeong-Chuan Kao ◽  
Hsiang-Nan Li
Keyword(s):  
Effective Action ◽  
Background Field ◽  
Landau Gauge ◽  
Quantum Corrections ◽  
Simons Theory ◽  
Loop Correction ◽  
Loop Contribution ◽  
Yang Mills ◽  
Chern Simons ◽  
Chern Simons Theory

We show that the two-loop contribution to the coefficient of the Chern–Simons term in the effective action of the Yang–Mills–Chern–Simons theory is infrared finite in the background field Landau gauge. We also discuss the difficulties in verifying the conjecture, due to topological considerations, that there are no more quantum corrections to the Chern–Simons term other than the well-known one-loop shift of the coefficient.

scholarly journals Author Correction: Measurement of the neutron charge radius and the role of its constituents

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
H. Atac ◽  
M. Constantinou ◽  
Z.-E. Meziani ◽  
M. Paolone ◽  
N. Sparveris
Keyword(s):  
Charge Radius

scholarly journals Evidence of a sudden increase in the nuclear size of proton-rich silver-96

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
M. Reponen ◽  
R. P. de Groote ◽  
L. Al Ayoubi ◽  
O. Beliuskina ◽  
M. L. Bissell ◽  
...  
Keyword(s):  
Charge Radius ◽  
Density Functional ◽  
Theory Development ◽  
Density Functional Theory Calculations ◽  
Neutron Number ◽  
Nuclear Charge Radius ◽  
Sudden Increase ◽  
Nuclear Theory ◽  
Charge Radii ◽  
Proton Pairing

AbstractUnderstanding the evolution of the nuclear charge radius is one of the long-standing challenges for nuclear theory. Recently, density functional theory calculations utilizing Fayans functionals have successfully reproduced the charge radii of a variety of exotic isotopes. However, difficulties in the isotope production have hindered testing these models in the immediate region of the nuclear chart below the heaviest self-conjugate doubly-magic nucleus 100Sn, where the near-equal number of protons (Z) and neutrons (N) lead to enhanced neutron-proton pairing. Here, we present an optical excursion into this region by crossing the N = 50 magic neutron number in the silver isotopic chain with the measurement of the charge radius of 96Ag (N = 49). The results provide a challenge for nuclear theory: calculations are unable to reproduce the pronounced discontinuity in the charge radii as one moves below N = 50. The technical advancements in this work open the N = Z region below 100Sn for further optical studies, which will lead to more comprehensive input for nuclear theory development.

Compilation of recent nuclear ground state charge radius measurements and tests for models

2021 ◽  
pp. 101440
Author(s):  
Tao Li ◽  
Yani Luo ◽  
Ning Wang
Keyword(s):  
Ground State ◽  
Charge Radius ◽  
Nuclear Ground State ◽  
State Charge

scholarly journals The effective neutrino charge radius

2003 ◽  
Vol 33 (S1) ◽  
pp. s865-s867 ◽  
Author(s):  
J. Papavassiliou ◽  
J. Bernabéu ◽  
D. Binosi ◽  
J. Vidal
Keyword(s):  
Charge Radius
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