pentaquark and instanton-induced forces

C. Semay; B. Silvestre-Brac

doi:10.1140/epja/i2004-10032-x

EPJ

a
b
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d
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ap
st
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ds
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2023 Impact factor 2.6

Hadrons and Nuclei

Open Access

Eur. Phys. J. A (2004) 22: 1-3
https://doi.org/10.1140/epja/i2004-10032-x

Letter

$1/2^ + uudd\bar s$ pentaquark and instanton-induced forces

C. Semay¹^* and B. Silvestre-Brac²

¹ Service de Physique Générale et de Physique des Particules Élémentaires, Groupe de Physique Nucléaire Théorique, Université de Mons-Hainaut, Place du Parc 20, B-7000, Mons, Belgium
² Laboratoire de Physique Subatomique et de Cosmologie, Avenue des Martyrs 53, F-38026, Grenoble-Cedex, France

^* e-mail: claude.semay@umh.ac.be

Abstract

The mass of the 1/2⁺ $uudd\bar s$ pentaquark is calculated within the framework of a semirelativistic effective Hamiltonian approach to QCD with instanton-induced forces, using a diquark picture. This approximation allows a correct treatment of the confinement, assumed here to be a Y-junction. With the [ud] diquark mass fitted on the $\Lambda$ -baryon, the ground-state pentaquark is found around 2.2 GeV.