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Main Authors:	Acar, A. G., Achenbach, P., Alvarado, J. S., Amaryan, M., Armstrong, W. R., Atac, H., Avakian, H., Baltzell, N. A., Barion, L., Battaglieri, M., Benmokhtar, F., Bianconi, A., Biselli, A. S., Brinkmann, K. -T., Bossù, F., Briscoe, W. J., Bueltmann, S., Burkert, V. D., Carman, D. S., Cao, T., Celentano, A., Chatagnon, P., Chinchay, H., Ciullo, G., Cole, P. L., Contalbrigo, M., D'Angelo, A., Dashyan, N., De Vita, R., Deur, A., Diehl, S., Dilks, C., Djalali, C., Dupre, R., Egiyan, H., Fassi, L. El, Farooq, M., Fegan, S., Ferrand, E., Fernando, I. P., Filippi, A., Fogler, C., Gates, K., Gavalian, G., Gilfoyle, G. P., Glazier, D. I., Gothe, R. W., Gotra, Y., Gualtieri, B., Hattawy, M., Hayward, T. B., Hoballah, M., Holmberg, D., Holtrop, M., Ilieva, Y., Ireland, D. G., Isupov, E. L., Jo, H. S., Joosten, S., Kageya, T., Keller, D., Klest, H., Klimenko, V., Kripko, A., Kubarovsky, V., Kuhn, S. E., Lanza, L., Lenisa, P., Li, X., Marchand, D., Martiryan, D., Mascagna, V., Matousek, G., McKinnon, B., Meziani, Z. E., Milner, R. G., Mineeva, T., Mirazita, M., Mokeev, V., Cardenas, E. F. Molina, Camacho, C. Munoz, Nadel-Turonski, P., Nagorna, T., Neupane, K., Niccolai, S., Niculescu, G., Osipenko, M., Ouillon, M., Pandey, P., Paolone, M., Pappalardo, L. L., Paremuzyan, R., Pasyuk, E., Paudel, C., Paul, S. J., Phelps, W., Pilleux, N., Vaishnavi, P. S. H., Polizzi, L., Poudel, J., Prok, Y., Radic, A., Richards, J., Ripani, M., Ritman, J., Rossi, P., Rusova, A. A., Schadmand, S., Schmidt, A., Sharabian, Y. G., Shirokov, E. V., Shrestha, S., Sidoretti, E., Sokhan, D., Sparveris, N., Spreafico, M., Strakovsky, I. I., Strauch, S., Codjo, F. Touchte, Tyson, R., Ungaro, M., Upton, D. W., Velasquez, C., Venturelli, L., Voskanyan, H., Voutier, E., Vossen, A., Wang, Y., Weerasinghe, U., Wei, X., Wickramaarachchi, N., Xu, L., Xu, Z., Zhao, Z. W.
Format:	Preprint
Published:	2026
Subjects:	High Energy Physics - Experiment Nuclear Experiment
Online Access:	https://arxiv.org/abs/2602.14271
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Table of Contents:

A first measurement of beam spin asymmetries for $π^+π^0$ and $π^-π^0$ pairs in semi-inclusive deep inelastic scattering is reported. The asymmetries in the dihadron angular distributions were measured from the scattering of a 10.6 GeV longitudinally polarized electron beam off a proton target, using the CLAS12 detector at Jefferson Lab. A photon classifier using a Gradient Boosted Trees (GBTs) architecture was trained with Monte Carlo simulations to reduce the amount of false combinatorial background $π^0$s, increasing statistics by up to five-fold compared to previous CLAS12 $π^0$ analyses. A nonzero $\sinϕ_{R_\perp}$ asymmetry is observed. This measurement is sensitive to the underexplored collinear twist-3 PDF $e(x)$, which encodes quark-gluon correlations in the proton, and presents a new avenue for its point-by-point extraction. The asymmetries also provide the first experimental evidence for the isospin-dependence of the helicity-dependent dihadron fragmentation function $G_1^\perp$, revealed by a sign-difference between the $π^+π^0$ and $π^-π^0$ channels in the $\sin(ϕ_h-ϕ_{R_\perp})$ modulation. In contrast, a large, same-sign enhancement near the $ρ$ mass for the $\sin(2ϕ_h-2ϕ_{R_\perp})$ modulation is observed, matching spectator model predictions in $π^+π^-$ pairs.

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