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Korover, I.; Pybus, J. R.; Schmidt, A.; Duer, M.; Hen, O.; Piasetzky, E.; Weinstein, L. B.; Higinbotham, D. W.; Adhikari, S.; Adhikari, K.; Amaryan, M.J.; Angelini, Giovanni; Atac, H.; Barion, L.; Battaglieri, M.; Beck, A.; Bedlinskiy, I.; Benmokhtar, Fatiha; Bianconi, A.; Biselli, A.S.; Boiarinov, S.; Briscoe, W.J.; Brooks, W.K.; Bulumulla, D.; Burkert, V.D.; Carman, D.S.; Celentano, A.; Chatagnon, P.; Chetry, T.; Clark, L.; Clary, B.; Cole, P.L.; Contalbrigo, M.; Crede, V.; D’angelo, A.; Vita, R. De; Defurne, M.; Denniston, A.; Deur, A.; Diehl, S.; Djalali, C.; Dupre, R.; Egiyan, H.; Ehrhart, M.; Alaoui, A. El; Fassi, L. El; Elouadrhiri, L.; Eugenio, P.; Fersch, R.; Filippi, A.; Forest, T.; Gavalian, G.; Girod, F.X.; Golovatch, E.; Gothe, R.W.; Griffioen, K.A.; Guidal, M.; Hafidi, K.; Hakobyan, H.; Harrison, N.; Hattawy, M.; Hauenstein, F.; Hayward, T.B.; Heddle, D.; Hicks, K.; Holtrop, M.; Ilieva, Y.; Ireland, D.G.; Isupov, E.L.; Jenkins, D.; Jo, H.S.; Joo, K.; Joosten, S.; Keller, D.; Khachatryan, M.; Khanal, A.; Khandaker, 7m.; Kim, A.; Kim, C.W.; Klein, F.J.; Kubarovsky, V.; Lanza, L.; Leali, M.; Lenisa, P.; Livingston, K.; Lucherini, V.; Macgregor, I .J .D.; Marchand, D.; Markov, N.; Marsicano, L.; Mascagna, V.; Mckinnon, B.; Beck, S. Mey-Tal; Mirazita, M.; Movsisyan, A; Camacho, C. Munoz; Mustapha, B.; Nadel-Turonski, P.; Neupane, K.; Niculescu, G.
Physics letters. B, 09/2021, Volume: 820Journal Article
The strong nuclear interaction is probed at short-distance and high-momenta using new measurements of the $^{12}$C$(e,e'p)$ and $^{12}$C$(e,e'pn)$ reactions, at high-$Q^2$ and $x_B>1$. The data span a missing-momentum range of 300-850 MeV/c and is predominantly sensitive to the dominant proton-neutron short-range correlated (SRC) pairs and complements previous $^{12}$C$(e,e'pp)$ measurements. 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, observed here for the first time, suggests that the measured high missing-momentum protons up to $850$ MeV/c belonged to SRC pairs. The measured $^{12}$C$(e,e'pn)$ / $^{12}$C$(e,e'p)$ ratio is consistent with a decrease in the fraction of proton-neutron SRC pairs with increasing missing-momentum. This confirms the transition from an isospin-dependent tensor $NN$ interaction at $\sim 400$ MeV/c to an isospin-independent scalar interaction at high-momentum around $\sim 800$ MeV/c.
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