First measurement of beam-recoil observables<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>C</mml:mi><mml:mrow><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>C</mml:mi><mml:mrow><mml:mi>z</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>in hyperon photoproduction

Bradford, R.; Schumacher, R. A.; Adams, G. S.; Amaryan, M. J.; Ambrozewicz, P.; Anciant, E.; Anghinolfi, M.; Asavapibhop, B.; Asryan, G.; Audit, G.; Avakian, H.; Bagdasaryan, H.; Baillie, N.; Ball, J.; Baltzell, N. A.; Barrow, S.; Batourine, V.; Battaglieri, M.; Beard, K.; Bedlinskiy, I.; Bektasoglu, M.; Bellis, M.; Benmouna, N.; Berman, B. L.; Bianchi, N.; Biselli, A.; Bonner, B. E.; Bouchigny, S.; Boiarinov, S.; Branford, D.; Briscoe, W. J.; Brooks, W. K.; Bültmann, S.; Burkert, Volker; Butuceanu, C.; Calarco, J. R.; Careccia, S. L.; Carman, D. S.; Carnahan, B.; Chen, S.; Cole, P. L.; Coleman, Alan; Collins, P.; Coltharp, P.; Cords, D.; Corvisiero, P.; Crabb, D.; Crannell, H.; Credé, V.; Cummings, J. P.; Masi, R. De; Sanctis, E. De; Vita, R. De; Degtyarenko, P. V.; Denizli, H.; Dennis, L.; Deur, A.; Dharmawardane, K. V.; Dickson, R.; Djalali, C.; Dodge, G. E.; Donnelly, J.; Doughty, D.; Dragovitsch, P.; Dugger, M.; Dytman, S.; Dzyubak, O. P.; Egiyan, H.; Egiyan, K. S.; Fassi, L. El; Elouadrhiri, L.; Empl, A.; Eugenio, P.; Fatemi, R.; Fedotov, G.; Feldman, G.; Feuerbach, R. J.; Forest, T. A.; Funsten, H. O.; Garçon, M.; Gavalian, G.; Gilfoyle, G. P.; Giovanetti, K. L.; Girod, F. X.; Goetz, J. T.; Gönenç, A.; Gothe, R. W.; Griffioen, K. A.; Guidal, M.; Guillo, M.; Guler, N.; Guo, L.; Gyurjyan, V.; Hadjidakis, C.; Hafidi, K.; Hakobyan, H.; Hakobyan, R.; Hardie, J.; Heddle, D.; Hersman, F. W.; Hicks, K.; Hleiqawi, I.; Holtrop, M.; Hu, J. F.; Huertas, M.; Hyde-Wright, C. E.; Ilieva, Y.; Ireland, D. G.; Ishkhanov, B. S.; Isupov, E. L.; Ito, M. M.; Jenkins, D.; Jo, H. S.; Joo, K.; Juengst, H. G.; Kalantarians, N.; Kellie, J. D.; Khandaker, M.; Kim, K. Y.; Kim, K.; Kim, W.; Klein, A.; Klein, F. J.; Klusman, M.; Kossov, M.; Kramer, L.; Kubarovsky, V.; Kühn, J.; Kuhn, S. E.; Kuleshov, S.; Lachniet, J.; Laget, J. M.; Langheinrich, J.; Lawrence, D.; Lima, A. C S; Livingston, K.; Lu, H. Y.; Lukashin, K.; MacCormick, M.; Manak, J. J.; Marchand, Claude; Markov, N.; McAleer, S.; McKinnon, B.; McNabb, J. W.; Mecking, B. A.; Mestayer, M. D.; Meyer, C. A.; Mibe, T.; Mikhailov, K.; Mirazita, M.; Miskimen, R.; Mokeev, V.; Moriya, K.; Morrow, S. A.; Moteabbed, M.; Muccifora, V.; Muêller, J.; Mutchler, G. S.; Nadel-Turoński, P.; Napolitano, J.; Nasseripour, R.; Natasha, N.; Niccolai, S.; Niculescu, G.; Niculescu, I.; Niczyporuk, B.; Niroula, M. R.; Niyazov, R. A.; Nozar, M.; O’Rielly, G. V.; Osipenko, M.; Ostrovidov, A. I.; Park, K.; Pasyuk, E.; Paterson, C.; Philips, S. A.; Pierce, J.; Pivnyuk, N.; Počanić, D.; Pogorelko, O.; Polli, E.; Popa, I.; Pozdniakov, S.; Preedom, B. M.; Price, J. W.; Prok, Y.; Protopopescu, D.; Qin, L. M.; Quinn, B.; Raue, B. A.; Riccardi, G.; Ricco, G.; Ripani, M.; Ritchie, Barry; Ronchetti, F.; Rosner, G.; Rossi, P.; Rowntree, D.; Rubin, P. D.; Sabatiã, F.; Salamanca, J.; Salgado, C.; Santoro, J. P.; Sapunenko, V.; Serov, V. S.; Shafi, A.; Sharabian, Y. G.; Shaw, J.; Shvedunov, N. V.; Simionatto, S.; Skabelin, A. V.; Smith, E. S.; Smith, L. C.; Sober, D. I.; Sokhan, D.; Spraker, M.; Stavinsky, A.; Stepanyan, S.; Stepanyan, S.; Stokes, B. E.; Stoler, P.; Strakovsky, I. I.; Strauch, S.; Taiuti, M.; Taylor, S.; Tedeschi, D. J.; Thoma, U.; Thompson, R.; Tkabladze, A.; Tkachenko, S.; Todor, L.; Tur, C.; Ungaro, M.; Vineyard, M. F.; Vlassov, A. V.; Wang, K.; Watts, D. P.; Weinstein, L. B.; Weller, H.R.; Weygand, D. P.; Williams, M.; Wolin, E.; Wood, M. H.; Yegneswaran, A.; Yun, Jaeseok; Zana, L.; Zhang, J.; Zhao, B.; Zhao, Z. W.

doi:10.1103/physrevc.75.035205

Cited by 158 publications

(123 citation statements)

References 84 publications

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“…In addition to the cross section measurements shown in the previous subsection, the same data was used to measure P, C x and C z [16]. The C x and C z measurements for K + Λ are shown in figure 2.5.…”

Section: Polarisation Observables At Clasmentioning

confidence: 99%

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Polarisation observables for strangeness photoproduction on a frozen spin target with CLAS at Jefferson Lab

Fegan¹

2012

AIP Conference Proceedings

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Section: Polarisation Observables At Clasmentioning

confidence: 99%

“…16. The parameter associated with P γ Σ is constrained to the mean value determined by cos(2φ) + sin(2φ) fits to the PARA/PERP beam asymmetries of the generated events for the two target states.…”

Section: The Double Asymmetry Techniquementioning

confidence: 99%

Polarisation observables for strangeness photoproduction on a frozen spin target with CLAS at Jefferson Lab

Fegan¹

2012

AIP Conference Proceedings

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“…[15] regarding the measured Λ polarization in the reaction γp → K + Λ. The spin observables they measured, C x and C z , determined the polarization transfered from the photon-beam, to the recoiling Λ in the x and z directions, respectively.…”

Section: Surprising Experimental Results Have Been Reported By Bradfomentioning

confidence: 99%

“…Although there is still some uncertainty regarding the production mechanism for the Λ, great progress has been made as a result of the aforementioned spin observable measurements. Collectively, cross section and polarization measurements [18,15] were necessary to identify the various mechanisms for Λ production, including the identification of numerous intermediate excited nucleon (N * ) resonances. We seek to make analogous measurements for the Ξ − to explore production and the contributing S = −1 hyperon spectrum.…”

Section: Surprising Experimental Results Have Been Reported By Bradfomentioning

confidence: 99%

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First Time Measurements of Polarization Observables for the Charged Cascade Hyperon in Photoproduction

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Polarization of hyperons in elementary photoproduction

Schumacher

Proceedings of the IX International Conference on Hypernuclear and Strange Particle Physics

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Recent measurements using the CLAS detector at Jefferson Lab of the reactions γ +p → K + +Λ and γ + p → K + + Σ 0 have been used to extract the spin transfer coefficients Cx and Cz for the first time. These observables quantify the degree of the photon circular polarization that is transferred to the recoiling hyperons in the scattering plane. The unexpected result is that Λ hyperons are produced "100% polarized" as seen when combining Cx and Cz with the induced transverse polarization, P . Furthermore, Cx and Cz seem to be linearly related. This paper discusses the experimental results and offers a hypothesis which can explain these observations. We show how the produced strange quark can be subject to a pure spin-orbit type of interaction which preserves its state of polarization throughout the hadronization process. PACS. 25.20.Lj Photoproduction reactions -13.40.-f Electromagnetic processes and properties -13.60.Le Meson production -13.30.Eg Hadronic decays -13.60.-r Photon and charged lepton interactions with hadrons

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First measurement of beam-recoil observablesCxandCzin hyperon photoproduction

Cited by 158 publications

References 84 publications

Polarisation observables for strangeness photoproduction on a frozen spin target with CLAS at Jefferson Lab

Polarisation observables for strangeness photoproduction on a frozen spin target with CLAS at Jefferson Lab

First Time Measurements of Polarization Observables for the Charged Cascade Hyperon in Photoproduction

Polarization of hyperons in elementary photoproduction

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