### Abstract

We study spin 1/2 isoscalar and isovector, even and odd parity candidates for the Θ^{+} (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 m_{π} = 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 language | English |
---|---|

Pages (from-to) | 49-53 |

Number of pages | 5 |

Journal | Nuclear Physics B - Proceedings Supplements |

Volume | 153 |

Issue number | 1 SPEC. ISS. |

DOIs | |

Publication status | Published - Mar 2006 |

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### ASJC Scopus subject areas

- Nuclear and High Energy Physics

### Cite this

^{+}pentaquark.

*Nuclear Physics B - Proceedings Supplements*,

*153*(1 SPEC. ISS.), 49-53. https://doi.org/10.1016/j.nuclphysbps.2006.01.005

**A comprehensive lattice search for the Θ ^{+} pentaquark.** / Csikor, F.; Fodor, Z.; Katz, S.; Kovács, T.; Tóth, B. C.

Research output: Contribution to journal › Article

^{+}pentaquark',

*Nuclear Physics B - Proceedings Supplements*, vol. 153, no. 1 SPEC. ISS., pp. 49-53. https://doi.org/10.1016/j.nuclphysbps.2006.01.005

^{+}pentaquark. Nuclear Physics B - Proceedings Supplements. 2006 Mar;153(1 SPEC. ISS.):49-53. https://doi.org/10.1016/j.nuclphysbps.2006.01.005

}

TY - JOUR

T1 - A comprehensive lattice search for the Θ+ pentaquark

AU - Csikor, F.

AU - Fodor, Z.

AU - Katz, S.

AU - Kovács, T.

AU - Tóth, B. C.

PY - 2006/3

Y1 - 2006/3

N2 - We study spin 1/2 isoscalar and isovector, even and odd parity candidates for the Θ+ (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.

AB - We study spin 1/2 isoscalar and isovector, even and odd parity candidates for the Θ+ (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.

UR - http://www.scopus.com/inward/record.url?scp=32144435587&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=32144435587&partnerID=8YFLogxK

U2 - 10.1016/j.nuclphysbps.2006.01.005

DO - 10.1016/j.nuclphysbps.2006.01.005

M3 - Article

AN - SCOPUS:32144435587

VL - 153

SP - 49

EP - 53

JO - Nuclear and Particle Physics Proceedings

JF - Nuclear and Particle Physics Proceedings

SN - 2405-6014

IS - 1 SPEC. ISS.

ER -