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論文

Exotic properties of $$N^*(1895)$$ and its impact on photoproduction of light hyperons

Khemchandani, K. P.*; Mart$'i$nez Torres, A.*; Kim, S.-H.*; Nam, S.-I.*; 保坂 淳

Acta Physica Polonica A, 142(3), p.329 - 336, 2022/09

https://doi.org/10.12693/APhysPolA.142.329
 被引用回数：0 パーセンタイル：0(Physics, Multidisciplinary)

In this work, we outline the findings of our recent study of the properties of $$N^*(1895)$$ and its consequential impacts on the cross-sections of the photoproduction of $$Lambda$$(1405). Further, we discuss the possibility of the existence of an isovector state with a mass similar to $$Lambda$$(1405), which we refer to as $$Sigma$$(1400). With the idea of motivating experimental investigations of $$Sigma$$(1400), we have studied its photo-production process and determined the respective cross-sections and polarization observables. We have studied also the coupling of $$N^*(1895)$$ to $$K$$$$Sigma$$(1400) and found that it gives an important contribution to the cross-sections near the threshold. In the process, we have determined the branching ratios of the decay of $$N^*(1895)$$ to the final states involving $$Lambda$$(1405) and $$Sigma$$(1400) to be in the range of 6-7 MeV. Our findings can motivate the consideration of alternative processes in partial wave analyses of experimental data when studying the properties of $$N^*(1895)$$.

論文

Photoproduction of $$Lambda^*$$ and $$Sigma^*$$ resonances with $$J^P=1/2^-$$ off the proton

Kim, S.-H.*; Khemchandani, K. P.*; Mart$'i$nez Torres, A.*; Nam, S.-I.*; 保坂 淳

Physical Review D, 103(11), p.114017_1 - 114017_12, 2021/06

https://doi.org/10.1103/PhysRevD.103.114017
 被引用回数：6 パーセンタイル：50.25(Astronomy & Astrophysics)

We study the photoproduction of the $$Lambda$$(1405) and $$Sigma$$(1400) hyperon resonances, the latter of which is not a well established state. We evaluate the $$s$$-, $$t$$-, and $$u$$-channel diagrams in the Born approximation by employing the effective Lagrangians. A new ingredient is the inclusion of a nucleon resonance $$N$$*(1895) that is dynamically generated with predictions for its coupling to the $$K$$$$Sigma$$(1405) and $$K$$$$Sigma$$(1400) channels. To extend the applicability of the model to energies beyond the threshold region, we consider a Regge model for the $$t$$-channel $$K$$- and $$K$$*-exchanges. Our results are in good agreement with the CLAS data available on $$Lambda$$(1405), while for $$Sigma$$(1400) we predict observables for its production. We also provide polarization observables for both hyperon productions, which can be useful in future experimental investigations. The present study provides new information on the nucleon resonance $$N$$*(1895) which can be an alternative source for generating the hyperon resonances $$Lambda$$(1405) and $$Sigma$$(1400).

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