The pentaquark $Θ^+(1540)$ in the string model

Details The pentaquark $Θ^+(1540)$ in the string model The pentaquark $Θ^+(1540)$ in the string model

2005-02-02

arxiv.org/abs/hep-ph/0502021v1

Phys.Rev. D71 (2005) 017502

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 5 figures

Scientific paper

10.1103/PhysRevD.71.017502

We consider the $\Theta^+(1540)$ pentaquark in the string model that correctly reproduces the linear Regge trajectories for the case of orbital excitations of light $q\bar q$ mesons and $qqq$ baryons. Assuming (and arguing in favour of) the diquark-antiquark-diquark ($[ud]\bar s [ud]$) clustering of this orbitally excited object we found its mass about $290 \rm {MeV}$ above the experimental value $1540 \rm {MeV}$. In the model considered this discrepancy could be attributed to the change of the constituent mass of $\bar s$ antiquark as compared to that of $s$ quark localized at the string end.

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