A comprehensive search for the +pentaquark on the lattice

Research output: Contribution to journalConference article

Abstract

We study spin 1/2 isoscalar and isovector, even and odd parity candidates for the +(1540) pentaquark particle using large scale lattice QCD simulations. Previous lattice works led to inconclusive results because so far it has not been possible to unambiguously identify the known scattering spectrum and tell whether additionally a genuine pentaquark state also exists. Here we carry out this analysis using several possible wave functions (operators), including spatially non-trivial ones with unit orbital angular momentum. The cross correlator matrix we compute is 14×14 with 60 non-vanishing elements. We can clearly distinguish the lowest scattering state(s) in both parity channels up to above the expected location of the pentaquark, but we find no trace of the latter. We conclude that there are most probably no pentaquark bound states at our quark masses, corresponding to mπ=400-630 MeV. However, we cannot rule out the existence of a pentaquark state at the physical quark masses or pentaquarks with a more exotic wave function.

Original languageEnglish
Article number008
JournalProceedings of Science
Volume22
Publication statusPublished - Jan 1 2005
Event29th Johns Hopkins Workshop on Current Problems in Particle Theory: Strong Matter in the Heavens, JHW 2005 - Budapest, Hungary
Duration: Aug 1 2005Aug 3 2005

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parity
wave functions
quarks
correlators
scattering
angular momentum
quantum chromodynamics
operators
orbitals
matrices
simulation

ASJC Scopus subject areas

  • General

Cite this

A comprehensive search for the +pentaquark on the lattice. / Katz, S.; Csikor, F.; Fodor, Z.; Kovács, T.; Tóth, B. C.

In: Proceedings of Science, Vol. 22, 008, 01.01.2005.

Research output: Contribution to journalConference article

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