[Kaon-LT] [EXTERNAL] Fw: arXiv New submission -> 2512.01928 in nucl-ex from acp548 at uregina.ca

Tue Dec 2 15:25:12 EST 2025

Dear Colleagues,

Please find below the information for the KaonLT pi+ BSA paper now posted on the arXiv.

Cheers,
Alicia

________________________________
From: e-prints at arxiv.org <e-prints at arxiv.org>
Sent: December 1, 2025 8:54 PM
To: Alicia Postuma <acp548 at uregina.ca>
Subject: arXiv New submission -> 2512.01928 in nucl-ex from acp548 at uregina.ca

Your submission submit/7006450 has been assigned the permanent arXiv
identifier 2512.01928 and is available at:

https://urldefense.proofpoint.com/v2/url?u=http-3A__arxiv.org_abs_2512.01928&d=DwIFAw&c=CJqEzB1piLOyyvZjb8YUQw&r=YtQMiwW7spOwhRsHGV2LDYtPiNvAO4j1mNjikf5Ejik&m=7U6pNP3ylOJeEahG0RiQyw2L8zaWO85-1NsxjAtDnbtYHHBtkb4WHD0mhAhhPTWm&s=bfHuQ7VtEajLk46Jc9SgPhDnlHRWu-sKFD6IojXlpRk&e= 

The paper password for this article is: rw7rd
Please share this with your co-authors. They may use it to claim
ownership.

Abstract will appear in today's mailing as:
------------------------------------------------------------------------------
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arXiv:2512.01928
From: Alicia Postuma <acp548 at uregina.ca>
Date: Mon, 1 Dec 2025 17:44:36 GMT   (1126kb)

Title: Probing hard/soft factorization via beam-spin asymmetry in exclusive
  pion electroproduction from the proton
Authors: Alicia C. Postuma (1), Garth M. Huber (1), D.J. Gaskell (2), N.
  Heinrich (1), T. Horn (3 and 2), M. Junaid (1), S.J.D. Kay (1 and 4), V.
  Kumar (1), P. Markowitz (5), J. Roche (6), R. Trotta (3), A. Usman (1), B.-G.
  Yu (7), T.K. Choi (8), K.-J. Kong (7), S. Ali (3), R. Ambrose (1), D. Androic
  (9), W. Armstrong (10 and 11), A. Bandari (12), V. Berdnikov (3), H. Bhatt
  (13), D. Bhetuwal (13), D. Biswas (14), M. Boer (10), P. Bosted (12), E.
  Brash (15), A. Camsonne (2), J.P. Chen (2), J. Chen (12), M. Chen (16), M.E.
  Christy (14), S. Covrig (2), M. M. Dalton (2), W. Deconinck (17), M.
  Diefenthaler (2), B. Duran (10), D. Dutta (13), M. Elaasar (18), R. Ent (2),
  H. Fenker (2), E. Fuchey (19), D. Hamilton (20), J.-O. Hansen (2), F.
  Hauenstein (21), S. Jia (10), M.K. Jones (2), S. Joosten (11), M.L. Kabir
  (13), A. Karki (13), C. Keppel (2), E. Kinney (22), N. Lashley-Colthirst
  (14), W.B. Li (12 and 23), D. Mack (2), S. Malace (2), M. McCaughan (2), Z.E.
  Meziani (11 and 10), R. Michaels (2), R. Montgomery (20), M. Muhoza (3), C.
  Munoz Camacho (24), G. Niculescu (25), I. Niculescu (25), Z. Papandreou (1),
  S. Park (23), E. Pooser (2), M. Rehfuss (10), B. Sawatzky (2), G.R. Smith
  (2), H. Szumila-Vance (2), A. Teymurazyan (1), H. Voskanyan (26), B.
  Wojtsekhowski (2), S.A. Wood (2), Z. Ye (11), C. Yero (5), J. Zhang (16), X.
  Zheng (16) ((1) University of Regina, (2) Thomas Jefferson National
  Accelerator Facility, (3) Catholic University of America, (4) University of
  York, (5) Florida International University, (6) Ohio University, (7) Korea
  Aerospace University, (8) Yonsei University, (9) University of Zagreb, (10)
  Temple University, (11) Argonne National Laboratory, (12) College of William
  and Mary, (13) Mississippi State University, (14) Hampton University, (15)
  Christopher Newport University, (16) University of Virginia, (17) University
  of Manitoba, (18) Southern University at New Orleans, (19) University of
  Connecticut, (20) University of Glasgow, (21) Old Dominion University, (22)
  University of Colorado Boulder, (23) Stony Brook University, (24) University
  Paris-Saclay, (25) James Madison University, (26) Yerevan Physics Institute)
Categories: nucl-ex hep-ex hep-ph
Comments: 9 pages, 7 figures, 2 tables (main text) plus 3 pages, 6 figures, 1
  table (supplemental material / appendices)
License: https://urldefense.proofpoint.com/v2/url?u=http-3A__creativecommons.org_licenses_by-2Dnc-2Dnd_4.0_&d=DwIFAw&c=CJqEzB1piLOyyvZjb8YUQw&r=YtQMiwW7spOwhRsHGV2LDYtPiNvAO4j1mNjikf5Ejik&m=7U6pNP3ylOJeEahG0RiQyw2L8zaWO85-1NsxjAtDnbtYHHBtkb4WHD0mhAhhPTWm&s=ik9zq_vAn3MhDy4fpM-7VTg0X9C5u-EoTGLUJgM7CPY&e= 
\\
  Deep exclusive meson production (DEMP) reactions, such as
$p(\vec{e},e'\pi^+)n$, 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 $p(\vec{e},e'\pi^+)n$
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 $\sigma_{LT'}/\sigma_0$ was
extracted from the beam-spin asymmetry $A_{LU}$. The $t$-dependence of
$\sigma_{LT'}/\sigma_0$ 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 $\sigma_{LT'}/\sigma_0$ at two ($x_B$, $t$)
settings. This was fairly flat, with $Q^2$ not having a measurable effect on
the value of $\sigma_{LT'}/\sigma_0$ 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 $\sigma_{LT'}/\sigma_0$, which
suggests that the factorization regime is not yet reached.
\\

Contains:
 00README.json: 219 bytes
 asym_q2p1.pdf: 87624 bytes
 asym_q3w2.pdf: 87411 bytes
 asym_q3w3.pdf: 87406 bytes
 asym_q4p4.pdf: 48483 bytes
 asym_q5p5.pdf: 48313 bytes
 elsarticle.cls: 44541 bytes
 fig1_phi.png: 48312 bytes
 fig2_gpdregge.png: 34551 bytes
 fig3_coinmx.pdf: 72869 bytes
 fig4_phasespace.png: 46013 bytes
 fig5_asym.pdf: 73132 bytes
 fig6_sigLTp.pdf: 73135 bytes
 fig7_q2scan.pdf: 23320 bytes
 kaonlt-bsa.tex: 52413 bytes
 klt-asym.bbl: 11492 bytes
 suppl.tex: 6621 bytes
 tphi-polar.png: 452300 bytes

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