Beam-recoil transferred polarization in 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msup><mml:mi>K</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:mi>Y</mml:mi></mml:mrow></mml:math>
 electroproduction in the nucleon resonance region with CLAS12

Carman, D. S.; D’Angelo, A.; Lanza, L.; Mokeev, V.; Adhikari, K. P.; Amaryan, M. J.; Armstrong, W.; Atac, H.; Avakian, H.; Gayoso, C. Ayerbe; Baltzell, N. A.; Barion, L.; Battaglieri, M.; Bedlinskiy, I.; Benkel, B.; Bianconi, A.; Biselli, A.; Bondí, M.; Boiarinov, S.; Bossù, F.; Briscoe, W. J.; Bueltmann, S.; Bulumulla, D.; Burkert, Volker; Capobianco, R.; Carvajal, J.; Celentano, A.; Chatagnon, P.; Chesnokov, V.; Chetry, T.; Ciullo, G.; Clark, L.; Cole, P. L.; Contalbrigo, M.; Costantini, G.; Credé, V.; Dashyan, N.; Vita, R. De; Defurne, M.; Deur, A.; Diehl, Stefan; Djalali, C.; Dupré, R.; Ehrhart, M.; Alaoui, A. El; Fassi, L. El; Elouadrhiri, L.; Fegan, S.; Filippi, A.; Gavalian, G.; Ghandilyan, Y.; Gilfoyle, G. P.; Girod, F. X.; Glazier, D. I.; Golubenko, A. A.; Gothe, R. W.; Gotra, Y.; Griffioen, K. A.; Hafidi, K.; Hakobyan, H.; Hattawy, M.; Hauenstein, F.; Hayward, T. B.; Hobart, A.; Holtrop, M.; Ilieva, Y.; Ireland, D. G.; Isupov, E. L.; Jo, H. S.; Joo, K. S.; Keller, D.; Khanal, A.; Kim, A.; Kim, W.; Klimenko, V.; Kripkó, Á.; Kubarovsky, V.; Leali, M.; Lee, S.; Lenisa, P.; Livingston, K.; MacGregor, I. J. D.; Marchand, D.; Marsicano, L.; Mascagna, V.; Mayer, Martin; McKinnon, B.; Migliorati, S.; Mineeva, T.; Mirazita, M.; Montgomery, R. A.; Camacho, C. Muñoz; Nadel-Turoński, P.; Neupane, K.; Newton, Joseph; Niccolai, S.; Osipenko, M.; Pandey, P.; Paolone, M.; Pappalardo, L. L.; Paremuzyan, R.; Pasyuk, E.; Paul, S.; Pilleux, N.; Pogorelko, O.; Price, J. W.; Prok, Y.; Raue, B. A.; Reed, Trevor; Ripani, M.; Ritman, J.; Rizzo, A.; Rossi, P.; Sabatié, F.; Salgado, C.; Schmidt, A.; Sharabian, Y. G.; Shirokov, E. V.; Shrestha, Uttam; Simmerling, P.; Sokhan, D.; Sparveris, N.; Stepanyan, S.; Strakovsky, I. I.; Strauch, S.; Tyler, N. J. C.; Tyson, R.; Ungaro, M.; Vallarino, S.; Venturelli, L.; Voskanyan, H.; Voutier, E.; Watts, D. P.; Wei, K.; Wei, X.; Wishart, R.; Wood, M. H.; Yale, B.; Zachariou, N.; Zhang, J.; Ziegler, V.

doi:10.1103/physrevc.105.065201

Cited by 5 publications

(3 citation statements)

References 69 publications

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“…In contrast to this, the CLAS12 experiment is more focused on electroproduction measurements of different final states. Analyses are currently ongoing and first data sets have been published [24].…”

Section: Discussionmentioning

confidence: 99%

“…Several different observables have been extracted for the first time in a wide energy range, which provides crucial new information for the different partialwave analyses [35]. Recently, first measurements of observables for similar final states using electroproduction and the CLAS12 detector have been published by the CLAS collaboration [24].…”

Section: Recent Progress In Different Reactionsmentioning

confidence: 99%

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Light Baryon Spectroscopy

Thiel

2023

J. Phys.: Conf. Ser.

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The precise understanding of the interaction inside the nucleons is still an open question in hadron spectroscopy. To tackle this issue, nucleons are excited by photons and their excitation spectra are determined. This effort is addressed by several different experiments worldwide, where different polarization observables are extracted for various reactions. This proceeding will give a short overview about the current status in Light Baryon Spectroscopy.

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Section: Discussionmentioning

confidence: 99%

Section: Recent Progress In Different Reactionsmentioning

confidence: 99%

Light Baryon Spectroscopy

Thiel

2023

J. Phys.: Conf. Ser.

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“…Q 2 versus W event distributions for these exclusive reaction channels measured with CLAS12 at a beam energy of ∼11 GeV are shown in Figure 10 (bottom). The first results from the CLAS12 N * program (at lower beam energies of 6.5/7.5 GeV) have recently been published on the beam-recoil hyperon transferred polarization in K + Y electroproduction [153]. The increase in the Q 2 -coverage for results on the electrocouplings from CLAS12 will enable exploration of the dressed-quark mass within the range of quark momenta where roughly 50% of hadron mass is expected to be generated (see Figure 10 (top)).…”

Section: Studies Of N * Structure In Experiments With Clas12 and Beyondmentioning

confidence: 99%

Nucleon Resonance Electroexcitation Amplitudes and Emergent Hadron Mass

et al. 2023

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Understanding the strong interaction dynamics that govern the emergence of hadron mass (EHM) represents a challenging open problem in the Standard Model. In this paper we describe new opportunities for gaining insight into EHM from results on nucleon resonance (N*) electroexcitation amplitudes (i.e., γvpN* electrocouplings) in the mass range up to 1.8 GeV for virtual photon four-momentum squared (i.e., photon virtualities Q2) up to 7.5 GeV2 available from exclusive meson electroproduction data acquired during the 6-GeV era of experiments at Jefferson Laboratory (JLab). These results, combined with achievements in the use of continuum Schwinger function methods (CSMs), offer new opportunities for charting the momentum dependence of the dressed quark mass from results on the Q2-evolution of the γvpN* electrocouplings. This mass function is one of the three pillars of EHM and its behavior expresses influences of the other two, viz. the running gluon mass and momentum-dependent effective charge. A successful description of the Δ(1232)3/2+ and N(1440)1/2+ electrocouplings has been achieved using CSMs with, in both cases, common momentum-dependent mass functions for the dressed quarks, for the gluons, and the same momentum-dependent strong coupling. The properties of these functions have been inferred from nonperturbative studies of QCD and confirmed, e.g., in the description of nucleon and pion elastic electromagnetic form factors. Parameter-free CSM predictions for the electrocouplings of the Δ(1600)3/2+ became available in 2019. The experimental results obtained in the first half of 2022 have confirmed the CSM predictions. We also discuss prospects for these studies during the 12-GeV era at JLab using the CLAS12 detector, with experiments that are currently in progress, and canvass the physics motivation for continued studies in this area with a possible increase of the JLab electron beam energy up to 22 GeV. Such an upgrade would finally enable mapping of the dressed quark mass over the full range of distances (i.e., quark momenta) where the dominant part of hadron mass and N* structure emerge in the transition from the strongly coupled to perturbative QCD regimes.

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Deep exclusive meson production as a probe to the puzzle of Λ hyperon polarization

2024

Phys. Rev. C

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In the 1970s, an unexpected transverse Λ polarization in unpolarized proton-beryllium collisions was discovered, which initiated extensive studies on spin phenomena in high-energy physics. Over the past five decades, similar transverse Λ polarization has been observed across various collision systems, including lepton-hadron deep-inelastic scattering, hadron-hadron collisions, and electron-positron collisions. Despite numerous promising theoretical models, the fundamental mechanism underlying this polarization phenomenon remains inconclusive to this day. However, in both longitudinally and transversely polarized lepton-hadron and hadron-hadron collisions, it is found that the Λ hyperon is polarized with respect to the initial parton spin direction. How the Λ hyperon acquires its spin has become one of the most crucial questions to address in order to resolve this puzzle. In this paper, I propose to use an exclusive process that can be measured at the Electron-Ion Collider, the deep exclusive meson production, to explicitly test the mechanism of Λ polarization. The outcomes of this experimental measurement are anticipated to unveil the dominant mechanism by which Λ obtains its spin, eliminating many of the ambiguities that have been encountered in previous studies. Finally, experimental challenges and requirements are discussed. Published by the American Physical Society 2024

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Beam-recoil transferred polarization in K+Y electroproduction in the nucleon resonance region with CLAS12

Cited by 5 publications

References 69 publications

Light Baryon Spectroscopy

Light Baryon Spectroscopy

Nucleon Resonance Electroexcitation Amplitudes and Emergent Hadron Mass

Deep exclusive meson production as a probe to the puzzle of Λ hyperon polarization

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