Recent observations of pentaquark candidates in the hidden-charm sector have renewed interest in exotic baryons beyond the conventional three-quark picture. We propose a new search for a narrow pentaquark state with strangeness S = +1 using missing-mass spectroscopy of the d(K⁺, p)X reaction at J-PARC. The K1.8 beamline spectrometer and the high-resolution S-2S spectrometer will precisely...
We study doubly heavy baryons and pentaquarks in the pion mean-field picture. In this description, the two heavy quarks form a compact core, while the light quarks are described by a pion field. The approach provides a good description of the observed doubly charmed baryons and allows us to estimate the masses of unobserved charmed and bottom baryons. Applying the same framework to doubly...
The hidden-charm pentaquark structures (P_c(4312)), (P_c(4440)), and
(P_c(4457)) lie close to the (\Sigma_c \bar{D}^{()}) thresholds and are
frequently interpreted as hadronic molecular candidates. We investigate their
open-charm decay patterns by treating these states as (S)-wave
(\Sigma_c \bar{D}^{()}) configurations. The short-range transitions
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[
\Sigma_c...
We analyze the radiative decay $P_c(4457)(3/2^-) \to P_c(4312)(1/2^-)\gamma$ by treating both pentaquark states as $S$-wave hadronic molecules. Using a chiral unitary approach with heavy-quark spin symmetry, we calculate photon couplings to meson-baryon components via nineteen $M1$ triangle loops. The transition is dominated by the $\bar D^{*0}\to\bar D^{0}\gamma$ loop, yielding a pure $M1$...
The LHCb collaboration's discovery of pentaquarks has revitalized interest in heavy exotic baryon spectroscopy, motivating extensive searches for new states. In this work, we investigate hidden-charm pentaquark states in heavy meson and singly heavy baryon systems by employing an off-shell coupled-channel formalism. The interaction kernel is constructed from meson exchange diagrams using an...
