Relativistic calculations for incoherent photoproduction of η mesons

Blokland, Ian; Sherif, H.

doi:10.1016/s0375-9474(01)00989-7

Cited by 7 publications

(6 citation statements)

References 20 publications

(53 reference statements)

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“…It may be argued that though the resonance N(1520) has very small decay width (at its pole mass) in the Nη channel, there are enough reasons (mentioned below) not to neglect this resonance in the η meson production reaction. (i) The mass of N(1520) is close to that of N(1535), and therefore there could be interference effect in the η meson production reaction [16], as quoted above.…”

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Resonance dynamics in the coherent η meson production in the (p,p′) reaction on the spin–isospin saturated nucleus

Das

2014

Physics Letters B

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For the forward going proton and η meson, the coherent η meson production in the (p, p ′ ) reaction on the spin-isospin saturated nucleus occurs only due to the η meson exchange interaction between the beam proton and nucleus. In this process, the nucleon in the nucleus can be excited to resonances N * and the η meson in the final state can arise due to N * → N η. We investigate the dynamics of resonances, including nucleon Born terms, and their interferences in the coherently added cross section of this reaction. We discuss the importance of N (1520) resonance and show the sensitivity of the cross section to the hadron nucleus interaction.Keywords: η meson exchange interaction, N * propagation PACS number(s): 25.40e, 13.30.Eg, 13.60.LeThe coherent meson production in the nuclear reaction is a potential tool to investigate the resonance dynamics in the nucleus, as well as the meson nucleus interaction in the final state. Since the branching ratio of ∆(1232) → Nπ is ≃ 100% [1], the coherent pion production process has been used extensively to investigate the ∆ dynamics in the nucleus [2, 3]. This process in (γ, π) and (e, eπ) reactions is used to study the transverse N → ∆ excitation in the nucleus, where the coherent pion is produced away from the forward direction [4]. The forward emission of coherent pion is a probe for the longitudinal ∆ excitation which occur in the pion nuclear reaction [5].The coherent pion production is also studied in the proton and ion induced nuclear reaction [6,7]. The issue of ∆-peak shift in the nucleus [8] is resolved, as it occurs because of the coherent pion production [6, 7] which is not possible for proton target. The coherent pion production in the (p, n) [6] and ( 3 He, t) [7] reactions on the nucleus is shown to have one to one correspondence with that in the π + meson nucleus scattering [9,10]. For the forward going protons, the coherent pion production in the (p, p ′ ) reaction can be used to produce π 0 beam [11] which is analogous to tagged photon beam.The coherent η meson production in the nuclear reaction is another process which can be used to study the resonance dynamics in the nucleus. Amongst the resonances, N(1535) has large decay branching ratio (42%) in the Nη channel, i.e., Γ N (1535)→N η (m = 1535 MeV) 1 email: swapand@barc.gov.in

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“…The change in the cross section because of the interference of N(1520) and N(1535) resonances is described in Ref. [16].…”

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Resonance dynamics in the coherent η meson production in the (p,p′) reaction on the spin–isospin saturated nucleus

Das

2014

Physics Letters B

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“…The Lagrangian L representing the meson baryon interaction depends on their spin and parity. For the pseudoscalar (0 − ) meson (i.e., π or η meson) coupling to the resonances in the considered reaction, Ls are presented below [20,21]. For the 1 2 + particle (i.e., N(940)…”

Section: Formalismmentioning

confidence: 99%

Hadron interferences in the proton-induced coherentη-meson-production reaction on a scalar-isovector nucleus

Das

2015

Phys. Rev. C

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The coherent η meson energy E η distribution spectra in the proton nucleus reaction have been calculated to investigate the π 0 − η mesons' interference, in addition to the study of resonance N * dynamics in the nucleus. The elementary reaction occurring in the nucleus is assumed to proceed as pN → pN * ; N * → N η. Born terms in the intermediate state is also considered. In a scalar-isovector nucleus, this reaction occurrs because of π 0 and η meson exchange interactions for the forward going proton and η meson; other meson exchange potentials do not contribute in this process. The sensitivity of the cross section to the hadron nucleus interactions, and the beam energy dependence of the cross section are studied for this reaction.

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“…This study was extended to incoherent photoproduction in Ref. [11]. The model is based on an effective Lagrangian to describe the production mechanism [1].…”

Section: Introductionmentioning

confidence: 99%

Nonlocality and medium effects in the exclusive photoproduction ofηmesons on nuclei

2003

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A relativistic model for the quasifree exclusive photoproduction of mesons on nuclei is extended to include both nonlocal and medium effects. The reaction is assumed to proceed via the dominant contribution of the S 11 ͑1535͒ resonance. The complicated integrals resulting from the nonlocality are simplified using a modified version of a method given by Cooper and Maxwell. The nonlocality effects are found to affect the magnitude of the cross section. Some possible effects of the medium on the propagation and properties of the intermediate S 11 resonance are studied. The effects of allowing S 11 to interact with the medium via mean field scalar and vector potentials are considered. Both broadening of width and reduction in mass of the resonance lead to a suppression of the calculated cross sections.

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Relativistic calculations for incoherent photoproduction of η mesons

Cited by 7 publications

References 20 publications

Resonance dynamics in the coherent η meson production in the (p,p′) reaction on the spin–isospin saturated nucleus

Resonance dynamics in the coherent η meson production in the (p,p′) reaction on the spin–isospin saturated nucleus

Hadron interferences in the proton-induced coherentη-meson-production reaction on a scalar-isovector nucleus

Nonlocality and medium effects in the exclusive photoproduction ofηmesons on nuclei

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