Where is the stable pentaquark?

초록

We systematically analyze the flavor color spin structure of the pentaquark q(4)(Q) over bar system in a constituent quark model based on the chromomagnetic interaction in both the SU(.3.) flavor symmetric and S U(3) flavor broken case with and without charm quarks. We show that the originally proposed pentaquark state (Q) over bar sgqq by Gignoux et al. and by Lipkin indeed belongs to the most stable pentaquark configuration, but that when charm quark mass correction based on recent experiments are taken into account, a doubly charmed antistrange pentaquark configuration P-cc (udcc (s) over bar) could he the most attractive flavor exotic configuration that could be stable and realistically searched for at present through the Pcc -> Lambda cK+K-pi(+) final states. The proposed final state is just reconstructing K+ instead of Irc in the measurement of Xi(++)(cc) -> Lambda(c)-K+K-pi(+) reported by the LHCb collaboration and hence measurable immediately.

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