TY - JOUR
T1 - A comprehensive lattice search for the Θ+ pentaquark
AU - Csikor, Ferenc
AU - Fodor, Zoltan
AU - Katz, S. D.
AU - Kovács, T. G.
AU - Tóth, B. C.
N1 - Funding Information:
The comparison of our results with those of others is not an easy task. Nevertheless, it is fair to say that existing lattice studies ([3–6,8,9]) are not precise enough so that – contrary to first impression – really strong contradictions can not be claimed to exist. Acknowledgements: This work was partially supported by Hungarian Scientific Grants, OTKA-T34980,T37615, M37071,T32501,AT49652. This research is part of the EU Integrated Infrastructure Initiative Hadronphysics project under contract No. RII3-CT-20040506078.
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.
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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 -