https://doi.org/10.1140/epja/i2013-13122-8
Regular Article - Theoretical Physics
The longitudinal response function of the deuteron in chiral effective field theory
1
Department of Physics, University of Arizona, 85721, Tucson, AZ, USA
2
Department of Physics and Astronomy and Institute of Nuclear and Particle Physics, Ohio University, 45701, Athens, OH, USA
* e-mail: cjyang@email.arizona.edu
Received:
30
May
2013
Revised:
23
August
2013
Accepted:
1
September
2013
Published online:
15
October
2013
We use chiral effective field theory (χEFT) to make predictions for the longitudinal electromagnetic response function of the deuteron, f
L
, which is measured in d(e, e′N) reactions. In this case the impulse approximation gives the full χEFT result up to 
relative to leading order. By varying the cutoff in the χEFT calculation between 0.6 and 1 GeV we conclude that the calculation is accurate to better than 10% for values of q
2 within 4 fm−2 of the quasi-free peak, up to final-state energies E
np
= 60 MeV. In these regions χEFT is in reasonable agreement with predictions for f
L
obtained using the Bonn potential. We also find good agreement with existing experimental data on f
L
, albeit in a more restricted kinematic domain.
© SIF, Springer-Verlag Berlin Heidelberg, 2013
