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論文

Strong decays of multistrangeness baryon resonances in the quark model

Arifi, A. J.*; 末永 大輝*; 保坂 淳; Oh, Y. S.*

Physical Review D, 105(9), p.094006_1 - 094006_17, 2022/05

Decay properties of multistrangeness $$Xi$$ and $$Omega$$ baryon resonances are investigated within the constituent quark model by including relativistic corrections. The strong decay widths of various $$Xi$$ and $$Omega$$ resonances are computed and tested for internal quark configurations to pin down their spin-parity ($$J$$$$^{P}$$) quantum numbers and internal structures. We found that the Roper-like resonances in the multistrangeness sector have large decay widths bearing resemblances to their siblings in light and heavy baryon sectors. In addition, we obtained the decay ratio for the $$Omega$$(2012) as $$Gamma$$($$Omega$$ $$rightarrow$$ $$Xi$$$$overline{K}$$$$pi$$)/$$Gamma$$($$Omega$$ $$rightarrow$$ $$Xi$$$$overline{K}$$) = 4.5%, which is consistent with the experimental data when $$J$$$$^{P}$$ = 3/2$$^{-}$$ is assigned. This observation holds the possibility that the $$Omega$$(2012) could naturally be explained as a three-quark state in the quark model. The decays of other low-lying $$Xi$$ and $$Omega$$ resonances are systematically analyzed, which would be useful to unveil the structure of these resonances in future experiments.

論文

Relativistic corrections to decays of heavy baryons in the quark model

Arifi, A. J.*; 末永 大輝*; 保坂 淳

Physical Review D, 103(9), p.094003_1 - 094003_6, 2021/05

We investigate relativistic corrections of an order 1/m$$^{2}$$, where m is the constituent quark mass, to heavy baryon decays by emitting one pseudoscalar meson in the quark model. This work is motivated by shortcomings in the previous studies in the nonrelativistic quark model for decays of the Roper-like states, such as $$Lambda$$$$_{c}$$(2765). We find that the relativistic corrections due to the internal motion of quarks are essential ingredients in improving their decay properties, such that the decay widths are significantly increased. In addition, such corrections can explain a phenomenological suppression of the quark axial-vector coupling constant $$g$$$$_A^{q}$$ for the $$Sigma$$$$_{c}$$(2455) and $$Sigma$$$$_{c}$$(2520) decays.

論文

Roper-like resonances with various flavor contents and their two-pion emission decays

Arifi, A. J.*; 永廣 秀子*; 保坂 淳; 谷田 聖

Physical Review D, 101(11), p.111502_1 - 111502_5, 2020/06

 被引用回数:13 パーセンタイル:71.01(Astronomy & Astrophysics)

We study the three-body decay of the newly observed bottom baryon $$Lambda_b^*(6072)$$ by LHCb; $$Lambda_b^*(6072) to Lambda_b pi pi$$. Its mass about 500 MeV above the ground state $$Lambda_b$$ and a broad width imply that the state could be an analogue of the Roper resonance of the nucleon $$N(1440)$$. In terms of sequential processes going through $$Sigma_b$$ and $$Sigma_b^*$$, we find that the observed invariant mass distribution is reproduced assuming its spin and parity $$J^P = 1/2^+$$. We discuss that the ratio of the two sequential processes and angular correlation of two pions are useful for the determination of spin and parity. We suggest further studies for the Roper resonance analogue in various flavor contents, raising an interesting and important question in baryon spectroscopy.

論文

Three-body decay of $$Lambda_c^{*} (2765)$$ and determination of its spin-parity

Arifi, A. J.*; 永廣 秀子*; 保坂 淳; 谷田 聖

Physical Review D, 101(9), p.094023_1 - 094023_17, 2020/05

 被引用回数:10 パーセンタイル:62.97(Astronomy & Astrophysics)

We study three-body decays of $$Lambda_c^{*}(2765) to Lambda_c^+pi^+pi^-$$ by using effective Lagrangians in a non-relativistic framework. We consider the sequential decays through $$Sigma_c(2455)pi$$ and $$Sigma_c^*(2520)pi$$ in intermediate states which are dominant contributions. The coupling constants in the effective Lagrangians are computed in the quark model. We demonstrate that the ratio $$R= Gamma(Lambda_c^*toSigma_c^*(2520)pi)/Gamma(Lambda_c^*to Sigma_c(2455)pi)$$ and angular correlations are sensitive to the spin and parity of $$Lambda_c^{*}(2765)$$. Thus, the measurement of these observables in experimental facilities such as Belle and LHCb can provide useful constraints to determine the spin and parity of $$Lambda_c^{*}(2765)$$.

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