Loading...
The Dirac form factor predicts the Pauli form factor in the Endpoint Model
Dagaonkar, Sumeet K. Jain, Pankaj Ralston, John P.
Dagaonkar, Sumeet K.
Jain, Pankaj
Ralston, John P.
Citations
Altmetric:
Abstract
We compute the momentum-transfer dependence of the proton Pauli form factor ๐น2 in the Endpoint overlap Model. We find the model correctly reproduces the scaling of the ratio of ๐น2 with the Dirac form factor ๐น1 observed at the Jefferson Laboratory. The calculation uses the leading-power, leading-twist Dirac structure of the quark light-cone wave function and the same endpoint dependence previously determined from the Dirac form factor ๐น1. There are no parameters and no adjustable functions in the Endpoint Modelโs prediction for the scaling behavior of ๐น2. The modelโs predicted momentum dependence of the ratio ๐น2(๐2) ๐น1(๐2) is quite insensitive to the endpoint wave function, which explains why the observed ratio scales like 1 / Q down to rather low momentum transfers. We also fit the magnitude of this ratio by adjusting the parameters of the wave function. The Endpoint Model appears to be the only comprehensive model consistent with all form factor information as well as reproducing fixed-angle protonโproton scattering at large momentum transfer. Any one of the processes is capable of predicting the others.
Description
Date
2016-07-04
Journal Title
Journal ISSN
Volume Title
Publisher
SpringerOpen
Collections
Research Projects
Organizational Units
Journal Issue
Keywords
Wave Function, Form Factor, Nucleon Form Factor, High Momentum Transfer, Soft Collinear Effective Theory
Citation
Dagaonkar, S.K., Jain, P. & Ralston, J.P. The Dirac form factor predicts the Pauli form factor in the Endpoint Model. Eur. Phys. J. C 76, 368 (2016). https://doi.org/10.1140/epjc/s10052-016-4224-4