Photoproduction of pions and etas in nuclei

“…Here k and q are the photon and pion 3-momentum in the cms for a given center of mass energy W, k R and q R are taken at the pole of the resonance. In the case of S 11 (1535) we take into account πN and ηN decay modes [24,28]:…”

mentioning

confidence: 99%

Proton polarizability contribution to hydrogen hyperfine splitting

Фаустов

Martynenko

2002

Eur. Phys. J. C

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“…Right hand side: difference between the inclusive and exclusive cross section, which arise mainly from γA → (A − 1)N ηπ. Data from [152], theory curves from GiBUU model [161,162,163,164] taken from [152].…”

Section: Inclusive Productionmentioning

confidence: 99%

Production of η and η′ mesons on nucleons and nuclei

Krusche¹,

Wilkin²

2015

Progress in Particle and Nuclear Physics

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The production of η and η mesons in photon-and hadron-induced reactions on free and quasifree nucleons and on nuclei is reviewed. The extensive database on γN → ηN , for both proton and neutron targets, is described in detail and its implications for the search for N resonances much heavier than the dominant S 11 (1535) discussed. Though less is currently known about the production of the η or of ηπ pairs, these also offer tantalizing prospects in the search for the missing isobars. The more limited data available on pion-induced production are still necessary ingredients in the partial wave analysis discussed.The production of the η-meson in pp and pn collisions shows once again the strong influence of the S 11 (1535) isobar, which is in contrast to the relatively weak behaviour seen near threshold for η production. This difference is reflected in the important final state interaction effects of the η in nuclei that may even lead to this meson being "bound" in some systems. The evidence for this is reviewed for both γA and pA collisions. The inclusive photoproduction of η, η , and ηπ pairs from nuclei provides further information regarding the production mechanism and the interaction of the η and η with nuclei and the ηπ pairs may even allow access to low mass ηA systems that are forbidden in direct single-meson photoproduction.

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“…The resonance parameters Γ R , M R , j 1 , j 2 , Γ tot were taken from [15,38]. In accordance with Refs.…”

Section: B Resonance Regionmentioning

confidence: 99%

“…pion (photon) momenta of resonances with mass M and M R respectively. In the case of S 11 (1535) we take into account πN and ηN decay modes [34,38]:…”

Section: B Resonance Regionmentioning

confidence: 99%