Model selection for<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msup><mml:mi>K</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi mathvariant="normal">Σ</mml:mi><mml:mo>−</mml:mo></mml:msup></mml:mrow></mml:math>photoproduction within an isobar model

Bydžovský, P.; Cieplý, A.; Petrellis, D.; Skoupil, D.; Zachariou, N.

doi:10.1103/physrevc.104.065202

Cited by 7 publications

(10 citation statements)

References 33 publications

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“…Compared with our present work, in fit M of Ref. [56], an additional K 1 (1270) meson exchange was considered in the t channel, and six more nucleon resonances in the s channel, namely, the N (1535)1/2 − , N (1650)1/2 − , N (1675)5/2 − , N (1720)3/2 + , N (1875)3/2 − , and N (2120)3/2 − resonances. For ∆ resonances, the ∆(1900)1/2 − exchange was considered, while the ∆(1910)1/2 + , ∆(1920)3/2 + , and ∆(1950)7/2 + resonances which are included in our present work were not considered in Ref.…”

Section: Resultsmentioning

confidence: 58%

“…In contrast, in the present work we include the N (1710)1/2 + , N (1880)1/2 + , ∆(1910)1/2 + , ∆(1920)3/2 + , and ∆(1950)7/2 + resonances, in addition to those three nucleon resonances mentioned above which are also found in fit L of Ref. [56]. Note that in our present work, the resonances are selected in such a way that only the resonances that have considerable branching ratios to KΣ channel in RPP [7] are considered, while in Ref.…”

Section: Resultsmentioning

confidence: 99%

“…In Ref. [56], the data for γn → K + Σ − were analyzed within an isobar model. There are two sets of fit results, i.e.…”

Section: Resultsmentioning

confidence: 99%

“…For ∆ resonances, the ∆(1900)1/2 − exchange was considered, while the ∆(1910)1/2 + , ∆(1920)3/2 + , and ∆(1950)7/2 + resonances which are included in our present work were not considered in Ref. [56]. In fit L of Ref.…”

Section: Resultsmentioning

confidence: 99%

“…In fit L of Ref. [56], the K 1 (1270) meson exchange in the t channel was not considered. Apart from the three nucleon resonances, N (1895)1/2 − , N (1900)3/2 + and N (2060)5/2 − , also found in the present work, the fit L also finds the N (1650)1/2 − , N (1675)5/2 − , N (1720)3/2 + , N (1875)3/2 − , and N (2120)3/2 − resonances to be relevant.…”

Section: Resultsmentioning

confidence: 99%

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Nucleon and $Δ$ resonances in $γn \to K^+Σ^-$ photoproduction

Wei,

Wang,

Huang

et al. 2022

Preprint

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The most recent data on beam asymmetries, Σ, and beam-target asymmetries, E, from the CLAS Collaboration, together with the previous data on differential cross sections and beam asymmetries from the CLAS and LEPS Collaborations, for the γn → K + Σ − reaction are studied based on an effective Lagrangian approach in the tree-level Born approximation. The t-channel K and K * (892) exchanges, the u-channel Σ exchange, the interaction current, and the exchanges of N , ∆, and their excited states in the s channel are considered in constructing the reaction amplitudes to describe the available experimental data. The reaction mechanisms of γn → K + Σ − are analyzed, and the associated resonances' parameters are extracted. The numerical results show that the ∆ exchange and the N (1710)1/2 + , N (1880)1/2 + , N (1900)3/2 + , and ∆(1920)3/2 + resonance exchanges in the s-channel dominate the γn → K + Σ − reaction in the lower energy region, and the t-channel K * (892) exchange plays a crucial role at forward angles in the higher energy region.

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Section: Resultsmentioning

confidence: 58%

Section: Resultsmentioning

confidence: 99%

“…In Ref. [56], the data for γn → K + Σ − were analyzed within an isobar model. There are two sets of fit results, i.e.…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 3 more Smart Citations

Nucleon and $Δ$ resonances in $γn \to K^+Σ^-$ photoproduction

Wei,

Wang,

Huang

et al. 2022

Preprint

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Beam-spin asymmetry Σ for Σ− hyperon photoproduction off the neutron

Zachariou¹,

Munévar²,

Berman³

et al. 2022

Physics Letters B

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K⁺Σ⁻ photoproduction within an isobar model

et al. 2022

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We used an isobar model to study the K+Σ− photoproduction reaction on a neutron target with focus on the resonance region. In order to achieve a reasonable agreement with the data, we included spin-3/2 and spin-5/2 nucleon resonances in a consistent formalism together with a Δ resonance and two kaon resonances on top of the Born terms. The free parameters of the model were adjusted to the data from the CLAS and LEPS Collaborations on differential cross sections and photon beam asymmetry. The cornerstone of this analysis was an upgrade of the fitting method. Previously, we used only the plain χ2 minimization, which could not prevent us from overfitting the data. We, therefore, introduced a regularization method, the least absolute selection shrinkage operator (LASSO), which, together with information criteria, restricts the number of nonzero parameters and prevents us from overfitting the data. In our analysis, we arrived at two models, fit M, whose parameters were fitted with the MINUIT code only, and fit L, where we used the more advanced LASSO. Both models describe the data in a similar way and we observe only slight differences in the dσ/dΩ data description at very forward angles where the fit M is flat whereas the fit L produces two broad peaks, and in the photon beam asymmetries above 2 GeV at backward kaon angles where the fit M produces a bump. Surprisingly, no hyperon resonances are needed for the correct data description in these models. On the other hand, the N(1720)3/2+ nucleon resonance was found to be very important in both models.

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Model selection forK+Σ−photoproduction within an isobar model

Cited by 7 publications

References 33 publications

Nucleon and $Δ$ resonances in $γn \to K^+Σ^-$ photoproduction

Nucleon and $Δ$ resonances in $γn \to K^+Σ^-$ photoproduction

Beam-spin asymmetry Σ for Σ− hyperon photoproduction off the neutron

K⁺Σ⁻ photoproduction within an isobar model

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Model selection forK+Σ−photoproduction within an isobar model

Cited by 7 publications

References 33 publications

Nucleon and $Δ$ resonances in $γn \to K^+Σ^-$ photoproduction

Nucleon and $Δ$ resonances in $γn \to K^+Σ^-$ photoproduction

Beam-spin asymmetry Σ for Σ− hyperon photoproduction off the neutron

K+Σ− photoproduction within an isobar model

Contact Info

Product

Resources

About

K⁺Σ⁻ photoproduction within an isobar model