12C(e,e'pN) measurements of short range correlations in the tensor-to-scalar interaction transition region
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,eâ€²p) and 12C(e,eâ€²pN) reactions (where N is either n or p), at high-Q2 and xB>1.1. The data span a missing-momentum range of 300â€“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,eâ€²pN) / 12C(e,eâ€²p) and 12C(e,eâ€²pp) / 12C(e,eâ€²pn) 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 âˆ¼400 MeV/c to an isospin-independent scalar interaction at high-momentum around âˆ¼800 MeV/c as predicted by theoretical calculation.
Korover, I., Pybus, J., Schmidt, A., Hauenstein, F., Duer, M., Hen, O., Piasetzky, E., Weinstein, L., Higinbotham, D., Adhikari, S., Adhikari, K., Amaryan, M., Angelini, G., Atac, H., Barion, L., Battaglieri, M., Beck, A., Bedlinskiy, I., Benmokhtar, F., Bianconi, A., Biselli, A., Boiarinov, S., Briscoe, W., Brooks, W., Bulumulla, D., Burkert, V., Carman, D., Celentano, A., Chatagnon, P., Chetry, T., & Clark, L. (2021). 12C(e,e'pN) measurements of short range correlations in the tensor-to-scalar interaction transition region. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 820. https://doi.org/10.1016/j.physletb.2021.136523