Photoproduction reactions and non-strange baryon spectroscopy

Ireland, D. G.; Pasyuk, E.; Strakovsky, I. I.

doi:10.1016/j.ppnp.2019.103752

Cited by 58 publications

(32 citation statements)

References 215 publications

(93 reference statements)

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“…A quite different behavior is observed if the measured helicity-dependent total cross section ∆σ is compared to its single-pion contribution over the resonance region. Direct experimental verification of the GDH sum are difficult because of the need to extend the measurements to sufficiently high E γ in spite of the 1/E γ weighting [19], and to reliably cover not only single-and double-pion photoproduction but all possible photon-induced processes. Some of the most recent determinations of the The proton total photoabsorption data are from Ref.…”

Section: Previous Evaluationsmentioning

confidence: 99%

Single-pion contribution to the Gerasimov--Drell--Hearn sum rule and related integrals

Strakovsky,

Širca,

Briscoe

et al. 2022

Preprint

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Phenomenological amplitudes obtained in partial-wave analyses (PWA) of single-pion photoproduction are used to evaluate the contribution of this process to the Gerasimov-Drell-Hearn (GDH), Baldin and Gell-Mann-Goldberger-Thirring (GGT) sum rules, by integrating up to 2 GeV in photon energy. Our study confirms that the single-pion contribution to all these sum rules converges even before the highest considered photon energy, but the levels of saturation are very different in the three cases. Single-pion production almost saturates the GDH sum rule for the proton, while a large fraction is missing in the neutron case. The Baldin integrals for the proton and the neutron are both saturated to about four fifths of the predicted total strength. For the GGT sum rule, the wide variability in predictions precludes any definitive statement.

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Section: Previous Evaluationsmentioning

confidence: 99%

Single-pion contribution to the Gerasimov--Drell--Hearn sum rule and related integrals

Strakovsky,

Širca,

Briscoe

et al. 2022

Preprint

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“…The current status of single-η meson production using photon beams is reviewed in Ref. [34], and in particular the information that can be obtained on the spectrum of light, nonstrange baryons. A whole "industry" of photoproduction experiments recorded data for several meson-production channels in the 1960s and '70s.…”

Section: Previous Measurementsmentioning

confidence: 99%

Photoproduction of η mesons off the proton for 1.2<Eγ<4.7GeV using CLAS at Jefferson Laboratory

Hu¹,

Akbar²,

Credé³

et al. 2020

Phys. Rev. C

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Photoproduction cross sections are reported for the reaction γ p → pη using energy-tagged photons and the CLAS spectrometer at Jefferson Laboratory. The η mesons are detected in their dominant charged decay mode, η → π + π − π 0 , and results on differential cross sections are presented for incident photon energies between 1.2 and 4.7 GeV. These new η photoproduction data are consistent with earlier CLAS results but extend the energy range beyond the nucleon resonance region into the Regge regime. The normalized angular distributions are also compared with the experimental results from several other experiments, and with predictions of η-MAID 2018 and the latest solution of the Bonn-Gatchina coupled-channel analysis. Differential cross sections dσ/dt are presented for incident photon energies E γ > 2.9 GeV (W > 2.5 GeV), and compared with predictions which are based on Regge trajectories exchange in the t-channel (Regge models). The data confirm the expected dominance of ρ, ω vector-meson exchange in an analysis by the Joint Physics Analysis Center.

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“…[7] and references therein. However, data in the other channels with the hyperon are still quite scarce in comparison with the number of data in the K + and K + 0 channels; see in a recent overview by Ireland, Pasyuk, and Strakovsky [8]. A combined analysis of all four channels with was performed by Mart and Kholili in Ref.…”

Section: Introductionmentioning

confidence: 99%

Model selection forK+Σ−photoproduction within an isobar model

et al. 2021

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We utilize an isobar model to investigate the K + − photoproduction off a neutron in the resonance region. Except for the Born terms, we include high-spin (spin-3/2a n ds p i n -5 /2) nucleon resonances in the consistent formalism together with a few and kaon resonances to achieve an acceptable agreement with data. Interestingly, we reveal that no hyperon resonances are needed to achieve a reasonable description of data. On the other hand the N (1720)3/2 + resonance was found to be very important for correct description of data. The free parameters of the model were fitted to experimental data from the LEPS and CLAS Collaborations on either differential cross sections or photon beam asymmetry. The novel feature of the fitting procedure is the use of a regularization method, the least absolute shrinkage selection operator, and information criteria in order to choose the best fit.

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Photoproduction reactions and non-strange baryon spectroscopy

Cited by 58 publications

References 215 publications

Single-pion contribution to the Gerasimov--Drell--Hearn sum rule and related integrals

Single-pion contribution to the Gerasimov--Drell--Hearn sum rule and related integrals

Photoproduction of η mesons off the proton for 1.2<Eγ<4.7GeV using CLAS at Jefferson Laboratory

Model selection forK+Σ−photoproduction within an isobar model

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