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Exotic baryons from a heavy meson and a nucleon: Positive parity states

Yasuhiro Yamaguchi¹, Shunsuke Ohkoda¹, Shigehiro Yasui², and Atsushi Hosaka¹

¹Research Center for Nuclear Physics (RCNP), Osaka University, Ibaraki, Osaka, 567-0047, Japan
²KEK Theory Center, Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization, 1-1, Oho, Ibaraki, 305-0801, Japan

Phys. Rev. D 85, 054003 – Published 1 March, 2012

DOI: https://doi.org/10.1103/PhysRevD.85.054003

Abstract

We study heavy baryons with exotic flavor quantum numbers formed by a heavy meson and a nucleon ( $\bar{D} N$ and $B N$ ) with positive parity. One-pion-exchange interaction, providing a tensor force, dominates as a long-range force to bind the $\bar{D} N$ and $B N$ systems. In the heavy-quark mass limit, pseudoscalar meson and vector meson are degenerate and the binding mechanism by the tensor force analogous to that in the nuclear systems becomes important. As a result, we obtain the $\bar{D} N$ and $B N$ resonant states in the $J^{P} = 1 / 2^{+}$ , $3 / 2^{+}$ , and $5 / 2^{+}$ channels with $I = 0$ .

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Exotic baryons from a heavy meson and a nucleon: Positive parity states

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