Dynamical coupled channels calculation of pion and omega meson production

Paris, Mark W.

doi:10.1103/physrevc.79.025208

Cited by 22 publications

(28 citation statements)

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“…In the same figure, the present results are also compared to model calculations from Refs. [7,11,12] and to the results from SAPHIR [6], the angular coverage of which (see the horizontal error bars in Fig. 4) was almost full, allowing to extrapolate the differential cross sections to the full range.…”

Section: Resultsmentioning

confidence: 99%

“…The dynamical coupled-channel analysis from Ref. [12] yielded separate values for two scattering lengths: α Existing experimental results for the imaginary [32] and the real [33] parts of the ω-nucleus potential were recalculated by one of the present authors (V. M.) into the ωN scattering length, using the connection of the mesonnucleus optical potential to the meson-nucleon scattering amplitude described in Ref. [34] (details of these calculations are beyond the scope of the present work and will be published separately).…”

Section: Resultsmentioning

confidence: 99%

“…energy, up to W = 2.4 GeV with ∼ 60% of the full production-angle range. Many models, including coupled channel, effective Lagrangian, and QCD-inspired approaches [7][8][9][10][11][12], were developed, trying to explain the behavior of the experimental data. Another high-statistics measurement of the γp → ωp differential cross sections and spin-density matrix elements was recently made by the CLAS Collaboration [13], covering c.m.…”

Section: Introductionmentioning

confidence: 99%

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Photoproduction of theωmeson on the proton near threshold

Strakovsky¹,

Prakhov²,

Azimov³

et al. 2015

Phys. Rev. C

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Photoproduction of the ω meson on the proton near threshold An experimental study of ω photoproduction on the proton has been conducted by using the Crystal Ball and TAPS multiphoton spectrometers together with the photon tagging facility at the Mainz Microtron MAMI. The γp → ωp differential cross sections are measured from threshold to the incident-photon energy Eγ = 1.40 GeV (W = 1.87 GeV for the center-of-mass energy) with 15-MeV binning in Eγ and full production-angle coverage. The quality of the present data near threshold gives access to a variety of interesting physics aspects. As an example, an estimation of the ωN scattering length αωp is provided.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Photoproduction of theωmeson on the proton near threshold

Strakovsky¹,

Prakhov²,

Azimov³

et al. 2015

Phys. Rev. C

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“…Several theoretical interpretations attempted the extraction of resonant contributions, reaching conflicting results [17][18][19][20][21][22][23][24], but all agreeing that beam polarization observables are needed to constrain the dynamics of the ω photo-production reaction.…”

Section: Introductionmentioning

confidence: 99%

Measurement of theΣbeam asymmetry for theωphotoproduction off the proton and the neutron at the GRAAL experiment

Vegna¹,

D’Angelo²,

Bartalini³

et al. 2015

Phys. Rev. C

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We report on new measurements of the beam asymmetry for ω photo-production on proton and neutron in Hydrogen and Deuterium targets from the GRAAL collaboration. The beam asymmetry values are extracted from the reaction threshold (Eγ = 1.1 GeV in the free nucleon kinematics) up to 1.5 GeV of incoming photon energy. For the first time both the radiative and the threepion decay channels are simultaneously investigated on the free proton. Results from the two decay channels are in agreement and provide important constraints for the determination of resonant state contributions to the ω production mechanism. First experimental results on the deuteron allow the extraction of the Σ beam asymmetry on quasi-free nucleons. Comparison of the results for free and quasi-free kinematics on the proton shows a generally reasonable agreement, similar to the findings in pseudo-scalar meson photo-production reactions. For the first time measurements on quasi-free neutrons are available, showing that both the strength and the angular distributions of the beam asymmetry are sensibly different from the results on the proton target.

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“…27,28 In the recent update of the ANL-Osaka group, 24 a plethora of pion-and photon-induced reactions has been analyzed. Meson-baryon interaction, including vector mesons and exchange interactions to study the generation of resonances has also been analyzed in Refs.…”

Section: 11mentioning

confidence: 99%