Observation of Beam Spin Asymmetries in the Process 
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 with CLAS12

Hayward, T. B.; Dilks, C.; Vossen, A.; Avakian, H.; Adhikari, S.; Angelini, G.; Arratia, M.; Atac, H.; Gayoso, C. Ayerbe; Baltzell, N. A.; Barion, L.; Battaglieri, M.; Bedlinskiy, I.; Benmokhtar, F.; Bianconi, A.; Biselli, A.; Bondí, M.; Bossù, F.; Boiarinov, S.; Briscoe, W. J.; Brooks, W. K.; Bulumulla, D.; Burkert, V. D.; Carman, D. S.; Carvajal, J.; Celentano, A.; Chatagnon, P.; Chetry, T.; Ciullo, G.; Clary, B. A.; Cole, P. L.; Contalbrigo, M.; Costantini, G.; Credé, V.; D’Angelo, A.; Dashyan, N.; Vita, R. De; Defurne, M.; Deur, A.; Diehl, Stefan; Djalali, C.; Dupré, R.; Dugger, M.; Egiyan, H.; Ehrhart, M.; Alaoui, A. El; Fassi, L. El; Elouadrhiri, L.; Fegan, S.; Filippi, A.; Forest, T. A.; Gavalian, G.; Gilfoyle, G. P.; Girod, F. X.; Glazier, D. I.; Golubenko, A. A.; Gothe, R. W.; Gotra, Y.; Griffioen, K. A.; Guidal, M.; Hafidi, K.; Hakobyan, H.; Hattawy, M.; Hauenstein, F.; Hicks, K.; Hobart, A.; Holtrop, M.; Ireland, D. G.; Isupov, E. L.; Jo, H. S.; Joo, K.; Joosten, S.; Keller, D.; Khachatryan, M.; Khanal, A.; Kim, A.; Kim, W.; Kripkó, Á.; Kubarovsky, V.; Kuhn, S. E.; Lanza, L.; Leali, M.; Lee, S.; Lenisa, P.; Livingston, K.; MacGregor, I. J. D.; Marchand, D.; Markov, N.; Marsicano, L.; Mascagna, V.; McKinnon, B.; Meziani, Z. E.; Mirazita, M.; Mokeev, V.; Movsisyan, A.; Camacho, C. Muñoz; Nadel-Turoński, P.; Naidoo, P.; Nanda, S.; Neupane, K.; Niccolai, S.; Niculescu, G.; O’Connell, T.; Osipenko, M.; Paolone, M.; Pappalardo, L. L.; Paremuzyan, R.; Pasyuk, E.; Phelps, W.; Pogorelko, O.; Prok, Y.; Raue, B. A.; Ripani, M.; Ritman, J.; Rizzo, A.; Rossi, P.; Rowley, J.; Sabatié, F.; Salgado, C.; Schmidt, Axel; Segarra, E.P.; Sharabian, Y. G.; Shrestha, Uttam; Sokhan, D.; Soto, Orlando; Sparveris, N.; Stepanyan, S.; Strakovsky, I. I.; Strauch, S.; Thornton, Adam; Tyler, N. J. C.; Tyson, R.; Ungaro, M.; Venturelli, L.; Voskanyan, H.; Voutier, E.; Watts, D. P.; Wei, K.; Wei, X.; Wood, M. H.; Yale, B.; Zachariou, N.; Zhang, J.

doi:10.1103/physrevlett.126.152501

Cited by 22 publications

(18 citation statements)

References 32 publications

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“…It is important to have a simulation model of quark fragmentation, implemented in a Monte Carlo (MC) program, reproducing the Collins effect as well as other effects like the dihadron asymmetry [12][13][14] in the fragmentation of transversely polarized quarks and the jet handedness [15][16][17] in the fragmentation of longitudinally polarized quarks. A promising model for the polarized quark fragmentation is the recursive String+ 3 P 0 model [18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Production of vector mesons in the String+${}^3P_0$ model of polarized quark fragmentation

Kerbizi,

Artru,

Martin

2021

Preprint

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Section: Introductionmentioning

confidence: 99%

Production of vector mesons in the String+${}^3P_0$ model of polarized quark fragmentation

Kerbizi,

Artru,

Martin

2021

Preprint

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“…where P 2 b is the luminosity-averaged squared beam polarization, which was (89.22 ± 2.51)% for our data [11]. The advantage of this method is that no acceptance correction is needed.…”

Section: Determination Of D Llmentioning

confidence: 75%

Longitudinal Spin Transfer to $Λ$ Hyperons in CLAS12

McEneaney¹

2022

Preprint

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Using the self-analyzing decay of the Λ, the longitudinal spin transfer D LL to the hyperon from a polarized electron beam scattering off an unpolarized proton target can be determined. For Λs produced in the current fragmentation region, this quantity is proportional to the helicity dependent fragmentation function G Λ 1 and can provide insight into the spin structure of the Λ. Currently, limited experimental data on D LL cannot discriminate between different models of Λ spin structure. This contribution reports on the status of the ongoing analysis of the longitudinal spin transfer using data taken by the CLAS12 spectrometer at Jefferson Lab with a 10.6 GeV polarized electron beam. We also report on the novel use of Graph Neural Networks (GNNs) to identify signal events.

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“…Studies of correlations of final state hadrons are crucial for understanding of the hadronization process in general, and the TMD FFs, in particular. First publication of CLAS12, dedicated to correlations in two hadron production in SIDIS [168], revealed significant correlations between hadrons produced in the current fragmentation region. Significant single-spin asymmetry has been measured, which can be related to higher twist PDF e, interpreted in terms of the average transverse forces acting on a quark after it absorbs the virtual photon [169].…”

Section: Momentum Tomography Of the Nucleonmentioning

confidence: 99%

“…Figure10: The new CLAS12 results on beam helicity asymmetry in two-pion semi-inclusive deep inelastic electroproduction[168]. The asymmetry as a function of x (left) and the invariant mass of pion pairs (right).…”

mentioning

confidence: 99%

Physics with CEBAF at 12 GeV and Future Opportunities

Arrington¹,

Battaglieri²,

Boehnlein³

et al. 2021

Preprint

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We summarize the ongoing scientific program of the 12 GeV Continuous Electron Beam Accelerator Facility (CE-BAF) and give an outlook into future scientific opportunities. The program addresses important topics in nuclear, hadronic, and electroweak physics including nuclear femtography, meson and baryon spectroscopy, quarks and gluons in nuclei, precision tests of the standard model, and dark sector searches. Potential upgrades of CEBAF are considered, such as higher luminosity, polarized and unpolarized positron beams, and doubling the beam energy.

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Observation of Beam Spin Asymmetries in the Process ep→e′π+π−X with CLAS12

Cited by 22 publications

References 32 publications

Production of vector mesons in the String+${}^3P_0$ model of polarized quark fragmentation

Production of vector mesons in the String+${}^3P_0$ model of polarized quark fragmentation

Longitudinal Spin Transfer to $Λ$ Hyperons in CLAS12

Physics with CEBAF at 12 GeV and Future Opportunities

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