The anticharmed exotic baryon Theta_c and its relatives

2003/07/28 by Marek Karliner, Karliner, Marek, Harry J. Lipkin +1
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph

paper · pdf · doi:10.48550/arxiv.hep-ph/0307343

LaTeX, 12 pages, no figures; typo corrected

openalex publication_date 2003/07/28 · arxiv created 2003/08/10 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

Motivated by the recent discovery of the exotic S=+1 narrow baryon resonance Theta⁺ at 1540 MeV, with quark content uudd sbar, we conjecture the existence of its anti-charmed analogue Theta_c, with quark content uudd cbar, and compute its likely properties. We rely on the recently constructed model of a novel kind of a pentaquark with an unusual color structure which provides a good approximation to the Theta⁺ mass. We expect that Theta_c is an isosinglet with J^P=1/2⁺ and estimate its mass at 2985 ± 50 MeV. We also discuss another possible exotic baryon resonance containing heavy quarks, the Theta_b⁺, a uudd bbar state, and estimate m_Thetab⁺=6398 ± 50 MeV. These states should appear as unexpectedly narrow peaks in D^-p, Dbar⁰ n, B⁰ p and B⁺ n mass distributions.

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