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Main Authors: Paul, S. J., Arratia, M., Hakobyan, H., Brooks, W., Acar, A., Achenbach, P., Alvarado, J. S., Armstrong, W. R., Baltzell, N. A., Barion, L., Bashkanov, M., Battaglieri, M., Benmokhtar, F., Bianconi, A., Biselli, A. S., Bossù, F., Boiarinov, S., Brinkmann, K. -T., Briscoe, W. J., Burkert, V., Cao, T., Carman, D. S., Chatagnon, P., Chinchay, H., Ciullo, G., Cole, P. L., D'Angelo, A., Dashyan, N., De Vita, R., Deur, A., Diehl, S., Djalali, C., Dupre, R., Egiyan, H., Alaoui, A. El, Elouadrhiri, L., Eugenio, P., Farooq, M., Fegan, S., Filippi, A., Fogler, C., Gavalian, G., Gilfoyle, G. P., Gothe, R. W., Gualtieri, B., Hattawy, M., Hauenstein, F., Hayward, T. B., Hoballah, M., Holtrop, M., Hung, Yu-Chun, Ilieva, Y., Ireland, D. G., Isupov, E. L., Jenkins, D., Jo, H. S., Keller, D., Khandaker, M., Kim, A., Klimenko, V., Korover, I., Kripko, A., Kubarovsky, V., Lanza, L., Lee, S., Lenisa, P., Li, X., Marchand, D., Mascagna, V., McKinnon, B., Mineeva, T., Mokeev, V., Cardenas, E. F. Molina, Camacho, C. Munoz, Nadel-Turonski, P., Nagorna, T., Neupane, K., Niccolai, S., Niculescu, G., Osipenko, M., Ostrovidov, A. I., Ouillon, M., Pandey, P., Paolone, M., Pappalardo, L. L., Paremuzyan, R., Pasyuk, E., Paudel, C., Phelps, W., Pilleux, N., Vaishnavi, P. S. H., Rafael, S. Polcher, Polizzi, L., Price, J. W., Prok, Y., Radic, A., Reed, T., Richards, J., Ripani, M., Ritman, J., Rosner, G., Schadmand, S., Schmidt, A., Schumacher, R. A., Sharabian, Y., Shrestha, S., Sidoretti, E., Sokhan, D., Sparveris, N., Spreafico, M., Stepanyan, S., Strakovsky, I. I., Strauch, S., Tenorio, M., Codjo, F. Touchte, Tyson, R., Ungaro, M., Vallarino, S., Velasquez, C., Venturelli, L., Voskanyan, H., Voutier, E., Wang, Y., Watts, D. P., Weerasinghe, U., Wei, X., Wood, M. H., Xu, L., Xu, Z., Zurek, M.
Format: Preprint
Published: 2025
Subjects:
Nuclear Experiment
Online Access:https://arxiv.org/abs/2512.05083
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Table of Contents:
  • We report on the first measurement of angular correlations between high-energy pions and slow protons in electron-nucleus ($eA$) scattering, providing a new probe of how a nucleus responds to a fast-moving quark. The experiment employed the CLAS detector with a 5-GeV electron beam incident on deuterium, carbon, iron, and lead targets. For heavier nuclei, the pion-proton correlation function is more spread-out in azimuth than for lighter ones, and this effect is more pronounced in the $πp$ channel than in earlier $ππ$ studies. The proton-to-pion yield ratio likewise rises with nuclear mass, although the increase appears to saturate for the heaviest targets. These trends are qualitatively reproduced by state-of-the-art $eA$ event generators, including BeAGLE, eHIJING, and GiBUU, indicating that current descriptions of target fragmentation rest on sound theoretical footing. At the same time, the precision of our data exposes model-dependent discrepancies, delineating a clear path for future improvements in the treatment of cold-nuclear matter effects in $eA$ scattering.

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