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Probing hard/soft factorization via beam-spin asymmetry in exclusive pion electroproduction from the proton

Fuente: arXiv

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Autori principali:	Postuma, Alicia C., Huber, Garth M., Gaskell, D. J., Heinrich, N., Horn, T., Junaid, M., Kay, S. J. D., Kumar, V., Markowitz, P., Roche, J., Trotta, R., Usman, A., Yu, B. -G., Choi, T. K., Kong, K. -J., Ali, S., Ambrose, R., Androic, D., Armstrong, W., Bandari, A., Berdnikov, V., Bhatt, H., Bhetuwal, D., Biswas, D., Boer, M., Bosted, P., Brash, E., Camsonne, A., Chen, J. P., Chen, J., Chen, M., Christy, M. E., Covrig, S., Dalton, M. M., Deconinck, W., Diefenthaler, M., Duran, B., Dutta, D., Elaasar, M., Ent, R., Fenker, H., Fuchey, E., Hamilton, D., Hansen, J. -O., Hauenstein, F., Jia, S., Jones, M. K., Joosten, S., Kabir, M. L., Karki, A., Keppel, C., Kinney, E., Lashley-Colthirst, N., Li, W. B., Mack, D., Malace, S., McCaughan, M., Meziani, Z. E., Michaels, R., Montgomery, R., Muhoza, M., Camacho, C. Munoz, Niculescu, G., Niculescu, I., Papandreou, Z., Park, S., Pooser, E., Rehfuss, M., Sawatzky, B., Smith, G. R., Szumila-Vance, H., Teymurazyan, A., Voskanyan, H., Wojtsekhowski, B., Wood, S. A., Ye, Z., Yero, C., Zhang, J., Zheng, X.
Natura:	Preprint
Pubblicazione:	2025
Soggetti:	Nuclear Experiment High Energy Physics - Experiment High Energy Physics - Phenomenology
Accesso online:	Acceder al recurso
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_version_	1866912913335255040
author	Postuma, Alicia C. Huber, Garth M. Gaskell, D. J. Heinrich, N. Horn, T. Junaid, M. Kay, S. J. D. Kumar, V. Markowitz, P. Roche, J. Trotta, R. Usman, A. Yu, B. -G. Choi, T. K. Kong, K. -J. Ali, S. Ambrose, R. Androic, D. Armstrong, W. Bandari, A. Berdnikov, V. Bhatt, H. Bhetuwal, D. Biswas, D. Boer, M. Bosted, P. Brash, E. Camsonne, A. Chen, J. P. Chen, J. Chen, M. Christy, M. E. Covrig, S. Dalton, M. M. Deconinck, W. Diefenthaler, M. Duran, B. Dutta, D. Elaasar, M. Ent, R. Fenker, H. Fuchey, E. Hamilton, D. Hansen, J. -O. Hauenstein, F. Jia, S. Jones, M. K. Joosten, S. Kabir, M. L. Karki, A. Keppel, C. Kinney, E. Lashley-Colthirst, N. Li, W. B. Mack, D. Malace, S. McCaughan, M. Meziani, Z. E. Michaels, R. Montgomery, R. Muhoza, M. Camacho, C. Munoz Niculescu, G. Niculescu, I. Papandreou, Z. Park, S. Pooser, E. Rehfuss, M. Sawatzky, B. Smith, G. R. Szumila-Vance, H. Teymurazyan, A. Voskanyan, H. Wojtsekhowski, B. Wood, S. A. Ye, Z. Yero, C. Zhang, J. Zheng, X.
author_facet	Postuma, Alicia C. Huber, Garth M. Gaskell, D. J. Heinrich, N. Horn, T. Junaid, M. Kay, S. J. D. Kumar, V. Markowitz, P. Roche, J. Trotta, R. Usman, A. Yu, B. -G. Choi, T. K. Kong, K. -J. Ali, S. Ambrose, R. Androic, D. Armstrong, W. Bandari, A. Berdnikov, V. Bhatt, H. Bhetuwal, D. Biswas, D. Boer, M. Bosted, P. Brash, E. Camsonne, A. Chen, J. P. Chen, J. Chen, M. Christy, M. E. Covrig, S. Dalton, M. M. Deconinck, W. Diefenthaler, M. Duran, B. Dutta, D. Elaasar, M. Ent, R. Fenker, H. Fuchey, E. Hamilton, D. Hansen, J. -O. Hauenstein, F. Jia, S. Jones, M. K. Joosten, S. Kabir, M. L. Karki, A. Keppel, C. Kinney, E. Lashley-Colthirst, N. Li, W. B. Mack, D. Malace, S. McCaughan, M. Meziani, Z. E. Michaels, R. Montgomery, R. Muhoza, M. Camacho, C. Munoz Niculescu, G. Niculescu, I. Papandreou, Z. Park, S. Pooser, E. Rehfuss, M. Sawatzky, B. Smith, G. R. Szumila-Vance, H. Teymurazyan, A. Voskanyan, H. Wojtsekhowski, B. Wood, S. A. Ye, Z. Yero, C. Zhang, J. Zheng, X.
contents	Deep exclusive meson production (DEMP) reactions, such as $p(\vec{e},e'π^+)n$, provide opportunities to study the three-dimensional structure of the nucleon through differential cross section and beam- and target-spin asymmetry measurements. This work aims to probe the onset of the hard/soft factorization regime through the exclusive $p(\vec{e},e'π^+)n$ reaction, as measured in the KaonLT experiment at Jefferson Lab Hall C. A 10.6 GeV longitudinally polarized electron beam was incident on an unpolarized liquid hydrogen target, and the scattered electron and produced meson were detected in two magnetic focusing spectrometers, enabling precision cross section measurements. The cross section ratio $σ_{LT'}/σ_0$ was extracted from the beam-spin asymmetry $A_{LU}$. The $t$-dependence of $σ_{LT'}/σ_0$ was determined at fixed $Q^2$ and $x_B$ over a range of kinematics from $2<Q^2<6$ GeV$^2$ above the resonance region ($W>2$ GeV). Furthermore, these data are combined with recent results from CLAS/CLAS12 to determine the $Q^2$-dependence of $σ_{LT'}/σ_0$ at two ($x_B$, $t$) settings. This was fairly flat, with $Q^2$ not having a measurable effect on the value of $σ_{LT'}/σ_0$ in the range explored. Results are compared to predictions from the generalized parton distribution (GPD) formalism, which relies explicitly on hard/soft factorization, and Regge formalism. The Regge models better predict $σ_{LT'}/σ_0$, which suggests that the factorization regime is not yet reached.
format	Preprint
id	arxiv_https___arxiv_org_abs_2512_01928
institution	arXiv
publishDate	2025
record_format	arxiv
spellingShingle	Probing hard/soft factorization via beam-spin asymmetry in exclusive pion electroproduction from the proton Postuma, Alicia C. Huber, Garth M. Gaskell, D. J. Heinrich, N. Horn, T. Junaid, M. Kay, S. J. D. Kumar, V. Markowitz, P. Roche, J. Trotta, R. Usman, A. Yu, B. -G. Choi, T. K. Kong, K. -J. Ali, S. Ambrose, R. Androic, D. Armstrong, W. Bandari, A. Berdnikov, V. Bhatt, H. Bhetuwal, D. Biswas, D. Boer, M. Bosted, P. Brash, E. Camsonne, A. Chen, J. P. Chen, J. Chen, M. Christy, M. E. Covrig, S. Dalton, M. M. Deconinck, W. Diefenthaler, M. Duran, B. Dutta, D. Elaasar, M. Ent, R. Fenker, H. Fuchey, E. Hamilton, D. Hansen, J. -O. Hauenstein, F. Jia, S. Jones, M. K. Joosten, S. Kabir, M. L. Karki, A. Keppel, C. Kinney, E. Lashley-Colthirst, N. Li, W. B. Mack, D. Malace, S. McCaughan, M. Meziani, Z. E. Michaels, R. Montgomery, R. Muhoza, M. Camacho, C. Munoz Niculescu, G. Niculescu, I. Papandreou, Z. Park, S. Pooser, E. Rehfuss, M. Sawatzky, B. Smith, G. R. Szumila-Vance, H. Teymurazyan, A. Voskanyan, H. Wojtsekhowski, B. Wood, S. A. Ye, Z. Yero, C. Zhang, J. Zheng, X. Nuclear Experiment High Energy Physics - Experiment High Energy Physics - Phenomenology Deep exclusive meson production (DEMP) reactions, such as $p(\vec{e},e'π^+)n$, provide opportunities to study the three-dimensional structure of the nucleon through differential cross section and beam- and target-spin asymmetry measurements. This work aims to probe the onset of the hard/soft factorization regime through the exclusive $p(\vec{e},e'π^+)n$ reaction, as measured in the KaonLT experiment at Jefferson Lab Hall C. A 10.6 GeV longitudinally polarized electron beam was incident on an unpolarized liquid hydrogen target, and the scattered electron and produced meson were detected in two magnetic focusing spectrometers, enabling precision cross section measurements. The cross section ratio $σ_{LT'}/σ_0$ was extracted from the beam-spin asymmetry $A_{LU}$. The $t$-dependence of $σ_{LT'}/σ_0$ was determined at fixed $Q^2$ and $x_B$ over a range of kinematics from $2<Q^2<6$ GeV$^2$ above the resonance region ($W>2$ GeV). Furthermore, these data are combined with recent results from CLAS/CLAS12 to determine the $Q^2$-dependence of $σ_{LT'}/σ_0$ at two ($x_B$, $t$) settings. This was fairly flat, with $Q^2$ not having a measurable effect on the value of $σ_{LT'}/σ_0$ in the range explored. Results are compared to predictions from the generalized parton distribution (GPD) formalism, which relies explicitly on hard/soft factorization, and Regge formalism. The Regge models better predict $σ_{LT'}/σ_0$, which suggests that the factorization regime is not yet reached.
title	Probing hard/soft factorization via beam-spin asymmetry in exclusive pion electroproduction from the proton
topic	Nuclear Experiment High Energy Physics - Experiment High Energy Physics - Phenomenology
url	https://arxiv.org/abs/2512.01928