12C(e,e'pN) measurements of short range correlations in the tensor-to-scalar interaction transition region




I. Korover, Nuclear Research Center-Negev
J. R. Pybus, Massachusetts Institute of Technology
A. Schmidt, Massachusetts Institute of Technology
F. Hauenstein, Massachusetts Institute of Technology
M. Duer, Tel Aviv University
O. Hen, Massachusetts Institute of Technology
E. Piasetzky, Tel Aviv University
L. B. Weinstein, Old Dominion University
D. W. Higinbotham, Thomas Jefferson National Accelerator Facility
S. Adhikari, Florida International University
K. Adhikari, Mississippi State University
M. J. Amaryan, Old Dominion University
Giovanni Angelini, The George Washington University
H. Atac, Temple University
L. Barion, Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara
M. Battaglieri, Thomas Jefferson National Accelerator Facility
A. Beck, Massachusetts Institute of Technology
I. Bedlinskiy, National Research Centre "Kurchatov Institute"
Fatiha Benmokhtar, Duquesne University
A. Bianconi, Università degli Studi di Brescia
A. S. Biselli, Fairfield University
S. Boiarinov, Thomas Jefferson National Accelerator Facility
W. J. Briscoe, The George Washington University
W. K. Brooks, Thomas Jefferson National Accelerator Facility
D. Bulumulla, Old Dominion University
V. D. Burkert, Thomas Jefferson National Accelerator Facility
D. S. Carman, Thomas Jefferson National Accelerator Facility
A. Celentano, Istituto Nazionale di Fisica Nucleare, Sezione di Genova
P. Chatagnon, IN2P3 - Institut National de Physique Nucléaire et de Physique Des Particules
T. Chetry, Mississippi State University
L. Clark, University of Glasgow

Document Type

Journal Article

Publication Date


Publication Title

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics






High-momentum configurations of nucleon pairs at short-distance are probed using measurements of the 12C(e,e′p) and 12C(e,e′pN) reactions (where N is either n or p), at high-Q2 and xB>1.1. The data span a missing-momentum range of 300–1000 MeV/c and are predominantly sensitive to the transition region of the strong nuclear interaction from a Tensor to Scalar interaction. The data are well reproduced by theoretical calculations using the Generalized Contact Formalism with both chiral and phenomenological nucleon-nucleon (NN) interaction models. This agreement suggests that the measured high missing-momentum protons up to 1000 MeV/c predominantly belong to short-ranged correlated (SRC) pairs. The measured 12C(e,e′pN) / 12C(e,e′p) and 12C(e,e′pp) / 12C(e,e′pn) cross-section ratios are consistent with a decrease in the fraction of proton-neutron SRC pairs and increase in the fraction of proton-proton SRC pairs with increasing missing momentum. This confirms the transition from an isospin-dependent tensor NN interaction at ∼400 MeV/c to an isospin-independent scalar interaction at high-momentum around ∼800 MeV/c as predicted by theoretical calculation.

Open Access