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Measurements of Beam Spin Asymmetries of $π^\pmπ^0$ dihadrons at CLAS12

Fuente: arXiv

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Detalles Bibliográficos
Autores principales:	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.
Formato:	Preprint
Publicado:	2026
Materias:	High Energy Physics - Experiment Nuclear Experiment
Acceso en línea:	Acceder al recurso
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_version_	1866914331392737280
author	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.
author_facet	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.
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.
format	Preprint
id	arxiv_https___arxiv_org_abs_2602_14271
institution	arXiv
publishDate	2026
record_format	arxiv
spellingShingle	Measurements of Beam Spin Asymmetries of $π^\pmπ^0$ dihadrons at CLAS12 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. High Energy Physics - Experiment Nuclear Experiment 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.
title	Measurements of Beam Spin Asymmetries of $π^\pmπ^0$ dihadrons at CLAS12
topic	High Energy Physics - Experiment Nuclear Experiment
url	https://arxiv.org/abs/2602.14271