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Dear Colleagues,</div>
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Please find below the information for the KaonLT pi+ BSA paper now posted on the arXiv.</div>
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Cheers,</div>
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Alicia</div>
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<b>From:</b> e-prints@arxiv.org <e-prints@arxiv.org><br>
<b>Sent:</b> December 1, 2025 8:54 PM<br>
<b>To:</b> Alicia Postuma <acp548@uregina.ca><br>
<b>Subject:</b> arXiv New submission -> 2512.01928 in nucl-ex from acp548@uregina.ca</div>
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<div style="font-size: 11pt;">Your submission submit/7006450 has been assigned the permanent arXiv<br>
identifier 2512.01928 and is available at:<br>
<br>
<a data-auth="NotApplicable" class="OWAAutoLink" id="OWAaefd8fd3-91d8-0b91-e823-45be1466e537" href="https://urldefense.proofpoint.com/v2/url?u=http-3A__arxiv.org_abs_2512.01928&d=DwMFAw&c=CJqEzB1piLOyyvZjb8YUQw&r=YtQMiwW7spOwhRsHGV2LDYtPiNvAO4j1mNjikf5Ejik&m=7U6pNP3ylOJeEahG0RiQyw2L8zaWO85-1NsxjAtDnbtYHHBtkb4WHD0mhAhhPTWm&s=bfHuQ7VtEajLk46Jc9SgPhDnlHRWu-sKFD6IojXlpRk&e=">http://arxiv.org/abs/2512.01928</a><br>
<br>
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The paper password for this article is: rw7rd<br>
Please share this with your co-authors. They may use it to claim<br>
ownership.<br>
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Abstract will appear in today's mailing as:<br>
------------------------------------------------------------------------------<br>
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arXiv:2512.01928<br>
From: Alicia Postuma <acp548@uregina.ca><br>
Date: Mon, 1 Dec 2025 17:44:36 GMT (1126kb)<br>
<br>
Title: Probing hard/soft factorization via beam-spin asymmetry in exclusive<br>
pion electroproduction from the proton<br>
Authors: Alicia C. Postuma (1), Garth M. Huber (1), D.J. Gaskell (2), N.<br>
Heinrich (1), T. Horn (3 and 2), M. Junaid (1), S.J.D. Kay (1 and 4), V.<br>
Kumar (1), P. Markowitz (5), J. Roche (6), R. Trotta (3), A. Usman (1), B.-G.<br>
Yu (7), T.K. Choi (8), K.-J. Kong (7), S. Ali (3), R. Ambrose (1), D. Androic<br>
(9), W. Armstrong (10 and 11), A. Bandari (12), V. Berdnikov (3), H. Bhatt<br>
(13), D. Bhetuwal (13), D. Biswas (14), M. Boer (10), P. Bosted (12), E.<br>
Brash (15), A. Camsonne (2), J.P. Chen (2), J. Chen (12), M. Chen (16), M.E.<br>
Christy (14), S. Covrig (2), M. M. Dalton (2), W. Deconinck (17), M.<br>
Diefenthaler (2), B. Duran (10), D. Dutta (13), M. Elaasar (18), R. Ent (2),<br>
H. Fenker (2), E. Fuchey (19), D. Hamilton (20), J.-O. Hansen (2), F.<br>
Hauenstein (21), S. Jia (10), M.K. Jones (2), S. Joosten (11), M.L. Kabir<br>
(13), A. Karki (13), C. Keppel (2), E. Kinney (22), N. Lashley-Colthirst<br>
(14), W.B. Li (12 and 23), D. Mack (2), S. Malace (2), M. McCaughan (2), Z.E.<br>
Meziani (11 and 10), R. Michaels (2), R. Montgomery (20), M. Muhoza (3), C.<br>
Munoz Camacho (24), G. Niculescu (25), I. Niculescu (25), Z. Papandreou (1),<br>
S. Park (23), E. Pooser (2), M. Rehfuss (10), B. Sawatzky (2), G.R. Smith<br>
(2), H. Szumila-Vance (2), A. Teymurazyan (1), H. Voskanyan (26), B.<br>
Wojtsekhowski (2), S.A. Wood (2), Z. Ye (11), C. Yero (5), J. Zhang (16), X.<br>
Zheng (16) ((1) University of Regina, (2) Thomas Jefferson National<br>
Accelerator Facility, (3) Catholic University of America, (4) University of<br>
York, (5) Florida International University, (6) Ohio University, (7) Korea<br>
Aerospace University, (8) Yonsei University, (9) University of Zagreb, (10)<br>
Temple University, (11) Argonne National Laboratory, (12) College of William<br>
and Mary, (13) Mississippi State University, (14) Hampton University, (15)<br>
Christopher Newport University, (16) University of Virginia, (17) University<br>
of Manitoba, (18) Southern University at New Orleans, (19) University of<br>
Connecticut, (20) University of Glasgow, (21) Old Dominion University, (22)<br>
University of Colorado Boulder, (23) Stony Brook University, (24) University<br>
Paris-Saclay, (25) James Madison University, (26) Yerevan Physics Institute)<br>
Categories: nucl-ex hep-ex hep-ph<br>
Comments: 9 pages, 7 figures, 2 tables (main text) plus 3 pages, 6 figures, 1<br>
table (supplemental material / appendices)<br>
License: <a data-auth="NotApplicable" class="OWAAutoLink" id="OWAec4d1c22-30d6-ebdd-28b1-20571307db24" href="https://urldefense.proofpoint.com/v2/url?u=http-3A__creativecommons.org_licenses_by-2Dnc-2Dnd_4.0_&d=DwMFAw&c=CJqEzB1piLOyyvZjb8YUQw&r=YtQMiwW7spOwhRsHGV2LDYtPiNvAO4j1mNjikf5Ejik&m=7U6pNP3ylOJeEahG0RiQyw2L8zaWO85-1NsxjAtDnbtYHHBtkb4WHD0mhAhhPTWm&s=ik9zq_vAn3MhDy4fpM-7VTg0X9C5u-EoTGLUJgM7CPY&e=">
http://creativecommons.org/licenses/by-nc-nd/4.0/</a><br>
\\<br>
Deep exclusive meson production (DEMP) reactions, such as<br>
$p(\vec{e},e'\pi^+)n$, provide opportunities to study the three-dimensional<br>
structure of the nucleon through differential cross section and beam- and<br>
target-spin asymmetry measurements. This work aims to probe the onset of the<br>
hard/soft factorization regime through the exclusive $p(\vec{e},e'\pi^+)n$<br>
reaction, as measured in the KaonLT experiment at Jefferson Lab Hall C. A 10.6<br>
GeV longitudinally polarized electron beam was incident on an unpolarized<br>
liquid hydrogen target, and the scattered electron and produced meson were<br>
detected in two magnetic focusing spectrometers, enabling precision cross<br>
section measurements. The cross section ratio $\sigma_{LT'}/\sigma_0$ was<br>
extracted from the beam-spin asymmetry $A_{LU}$. The $t$-dependence of<br>
$\sigma_{LT'}/\sigma_0$ was determined at fixed $Q^2$ and $x_B$ over a range of<br>
kinematics from $2<Q^2<6$ GeV$^2$ above the resonance region ($W>2$ GeV).<br>
Furthermore, these data are combined with recent results from CLAS/CLAS12 to<br>
determine the $Q^2$-dependence of $\sigma_{LT'}/\sigma_0$ at two ($x_B$, $t$)<br>
settings. This was fairly flat, with $Q^2$ not having a measurable effect on<br>
the value of $\sigma_{LT'}/\sigma_0$ in the range explored. Results are<br>
compared to predictions from the generalized parton distribution (GPD)<br>
formalism, which relies explicitly on hard/soft factorization, and Regge<br>
formalism. The Regge models better predict $\sigma_{LT'}/\sigma_0$, which<br>
suggests that the factorization regime is not yet reached.<br>
\\<br>
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Contains:<br>
00README.json: 219 bytes<br>
asym_q2p1.pdf: 87624 bytes<br>
asym_q3w2.pdf: 87411 bytes<br>
asym_q3w3.pdf: 87406 bytes<br>
asym_q4p4.pdf: 48483 bytes<br>
asym_q5p5.pdf: 48313 bytes<br>
elsarticle.cls: 44541 bytes<br>
fig1_phi.png: 48312 bytes<br>
fig2_gpdregge.png: 34551 bytes<br>
fig3_coinmx.pdf: 72869 bytes<br>
fig4_phasespace.png: 46013 bytes<br>
fig5_asym.pdf: 73132 bytes<br>
fig6_sigLTp.pdf: 73135 bytes<br>
fig7_q2scan.pdf: 23320 bytes<br>
kaonlt-bsa.tex: 52413 bytes<br>
klt-asym.bbl: 11492 bytes<br>
suppl.tex: 6621 bytes<br>
tphi-polar.png: 452300 bytes<br>
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