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Journal Articles

Structure of charmed baryons studied by pionic decays

Nagahiro, Hideko*; Yasui, Shigehiro*; Hosaka, Atsushi; Oka, Makoto; Noumi, Hiroyuki*; Noumi, Hiroyuki*

Physical Review D, 95(1), p.014023_1 - 014023_20, 2017/01

 Times Cited Count:39 Percentile:92.61(Astronomy & Astrophysics)

We investigate the decays of the charmed baryons aiming at the systematic understanding of hadron internal structures based on the quark model by paying attention to heavy quark symmetry. We evaluate the decay widths from the one pion emission for the known excited states, $$Lambda^*_c(2595)$$, $$Lambda^*_c(2625)$$, $$Lambda^*_c(2765)$$, $$Lambda^*_c (2880)$$ and $$Lambda^*_c(2940)$$, as well as for the ground states $$Sigma_c(2455)$$ and $$Sigma^*_c(2520)$$. The calculated decay widths are in good agreement with the experimental data, and several important predictions for higher excited $$Lambda^*_c$$ baryons are given. We also find that the axial-vector type coupling of the pion to the light quarks is essential, which is expected from chiral symmetry, to reproduce the decay widths especially of the low lying $$Lambda^*_c$$ baryons. We emphasize the importance of the branching ratios of $$Gamma(Sigma^*_c pi)/Gamma(Sigma_c pi)$$ for the study of the nature of higher excited $$Lambda^*_c$$ baryons.

Journal Articles

Precise determination of $$^{12}_{Lambda}$$C level structure by $$gamma$$-ray spectroscopy

Hosomi, Kenji; Ma, Y.*; Ajimura, Shuhei*; Aoki, Kanae*; Dairaku, Seishi*; Fu, Y.*; Fujioka, Hiroyuki*; Futatsukawa, Kenta*; Imoto, Wataru*; Kakiguchi, Yutaka*; et al.

Progress of Theoretical and Experimental Physics (Internet), 2015(8), p.081D01_1 - 081D01_8, 2015/08

 Times Cited Count:13 Percentile:70.14(Physics, Multidisciplinary)

Level structure of the $$^{12}_{Lambda}$$C hypernucleus was precisely determined by means of $$gamma$$-ray spectroscopy. We identified four $$gamma$$-ray transitions via the $$^{12}$$C$$(pi^{+},K^{+}gamma)$$ reaction using a germanium detector array, Hyperball2. The spacing of the ground-state doublet $$(2^{-}, 1^{-}_{1})$$ was measured to be $$161.5pm0.3$$(stat)$$pm0.3$$ (syst)keV from the direct $$M1$$ transition. Excitation energies of the $$1^{-}_{2}$$ and $$1^{-}_{3}$$ states were measured to be $$2832pm3pm4$$, keV and $$6050pm8pm7$$, keV, respectively. The obtained level energies provide definitive references for the reaction spectroscopy of $$Lambda$$ hypernuclei.

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