Measurement of the beam-helicity asymmetry I⊙ in the photoproduction of $ \pi^{0}$ $ \pi^{\pm}$ pairs off protons and off neutrons

Oberle, M.; Ahrens, J.; Annand, J. R. M.; Arends, H. J.; Bantawa, K.; Bartolome, P. A.; Beck, R.; Bekrenev, V.; Berghäuser, H.; Braghieri, A.; Branford, D.; Briscoe, W. J.; Brudvik, J.; Cherepnya, S.; Demissie, B.; Dieterle, M.; Downie, E. J.; Drexler, P.; Filʼkov, L.V.; Fix, A.; Glazier, D. I.; Heid, E.; Hornidge, D.; Howdle, D.; Huber, G. M.; Jahn, O.; Jaeglé, I.; Jude, T. C.; Käser, A.; Kashevarov, V. L.; Keshelashvili, I.; Kondratiev, R.; Korolija, M.; Kruglov, S. P.; Krusche, B.; Kulbardis, A. A.; Lisin, V.; Livingston, K.; MacGregor, I. J. D.; Maghrbi, Y.; Mancell, J.; Manley, D. M.; Marinides, Z.; Martínez, M.; McGeorge, J. C.; McNicoll, E. F.; Mekterović, D.; Metag, V.; Mićanović, Saša; Middleton, D. G.; Mushkarenkov, A.; Nefkens, B. M. K.; Nikolaev, A.; Novotny, R.; Ostrick, M.; Oussena, B.; Pedroni, P.; Pheron, F.; Polonski, A.; Prakhov, S.; Robinson, J.; Rosner, G.; Rostomyan, T.; Schumann, S.; Sikora, M. H.; Sober, D. I.; Starostin, A.; Supek, I.; Thiel, M.; Thomas, A.; Unverzagt, M.; Watts, D. P.; Werthmüller, D.; Witthauer, L.; Zehr, F.

doi:10.1140/epja/i2014-14054-5

Cited by 21 publications

(45 citation statements)

References 65 publications

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“…The data analysis was based on the methods developed for the reaction identification of meson pairs (ππ and πη) described in detail in [7,23,24,27,28] for measurements with unpolarized liquid deuterium targets. The treatment of the unpolarized background from 'heavy' nuclei (carbon, oxygen), present in the butanol target, is described in [33,34,37] for photoproduction of η and π 0 mesons.…”

Section: Discussionmentioning

confidence: 99%

“…However, polarization observables seem to be effected in a completely different way. We have previously tested this for the polarization observable I ⊙ measured with a circularly polarized photon beam on unpolarized target for the production of meson pairs [24,27,28]. No significant effects were found for ππ and πη pairs.…”

Section: Complications For Quasi-free Production Off Bound Nucleonsmentioning

confidence: 99%

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First measurement of helicity-dependent cross sections in π0η photoproduction from quasi-free nucleons

et al. 2018

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Section: Discussionmentioning

confidence: 99%

Section: Complications For Quasi-free Production Off Bound Nucleonsmentioning

confidence: 99%

First measurement of helicity-dependent cross sections in π0η photoproduction from quasi-free nucleons

et al. 2018

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“…This property for c 1 does not occur for the other coefficients and was also observed for double-pion production in reference [52]. In order to fully make sense of the results shown, a better theoretical understanding of the reactions is needed.…”

Section: Discussionmentioning

confidence: 52%

“…The beam-helicity asymmetry, I , arising from a circularly polarized photon beam, can be chosen to be an independent quantity yielding to a component of the eight complex amplitudes mentioned. This particular observable has previously been studied for double pion photoproduction in references [49,50,52,56] up to center-of-mass energy W < 2.3 GeV. The region with W > 2.3 GeV was previously unexplored, but beam-helicity asymmetry measurements in this region are shown in this chapter.…”

Section: Discussionmentioning

confidence: 85%

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The Beam-Helicity Asymmetry for Two Pseudoscalar Mesons in Photoproduction and a Partial Wave Analysis for Excited Hyperons

Badui¹

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This dissertation, written by Rafael A. Badui-Cruz, and entitled The Beam-Helicity Asymmetry for γp → pπ + π − and γp → pK + K − and a Partial Wave Analysis for Excited Hyperons, having been approved in respect to style and intellectual content, is referred to you for judgment.We have read this dissertation and recommend that it be approved. The work environment that they developed have helped maximize the productivity of many students, including myself. I appreciate the trust that they placed in me and it has been a pleasure to be a part of their team.I would like to thank the members of the g12 group, especially to Johann Goetz, Michael Kunkel, Carlos Salgado, and Diane Schott for their vast expertise in all g12 related aspects and the patience they had assisting me. production. The production mechanism for strange hadrons is not well understood. The beam-helicity asymmetry is a polarization observable that provides information on interfering production mechanisms in the reaction. It is shown that the asymmetry is sensitive to several kinematic variables that are key in modeling the reaction dynamics. Furthermore, the comparison of the beam-helicity asymmetry between the kaon and pion channels serves as a platform for the investigation of flavor dependence. A partial wave analysis on the pK − system is also performed in a search for missing hyperon excitations.

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N* Photoexcitation Results from Mainz

Sokhoyan

2018

Few-Body Syst

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Measurement of the beam-helicity asymmetry I⊙ in the photoproduction of $ \pi^{0}$ $ \pi^{\pm}$ pairs off protons and off neutrons

Cited by 21 publications

References 65 publications

First measurement of helicity-dependent cross sections in π0η photoproduction from quasi-free nucleons

First measurement of helicity-dependent cross sections in π0η photoproduction from quasi-free nucleons

The Beam-Helicity Asymmetry for Two Pseudoscalar Mesons in Photoproduction and a Partial Wave Analysis for Excited Hyperons

N* Photoexcitation Results from Mainz

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