Lattice QCD Evidence for Exotic Tetraquark Resonance
نویسندگان
چکیده
We study the manifestly exotic tetraquark D s0 cus̄d̄ and the scalar tetraquark f0 udūd̄ in SU(3)c anisotropic quenched lattice QCD. We adopt the O a -improved Wilson (clover) fermion at β 5 75 on 123 96 with renormalized anisotropy as at 4, and investigate the correlator of the four-quark (4Q) system, cus̄d̄, with various quark masses including the idealized SU(4) f case. For f0 udūd̄ etc., we only consider connected diagrams at the quenched level, i.e., the tetraquark f0 udūd̄ is identical with D s0 cus̄d̄ in the idealized SU(4) f case. First, for comparison, we study the lowest qq̄ scalar meson, and find that it has a large mass of about 1.37GeV after chiral extrapolation, which corresponds to f
منابع مشابه
Pentaquarks: Status and Perspectives for Lattice Calculations
The quantum chromo-dynamics (QCD) may not preclude the presence of the multi-quark hadrons such as tetraquark (qqq̄q̄), pentaquark (qqqqq̄), dibaryon (qqqqqq) and so on, because of the color confinement. Especially, we are let to be interested in exotic multi-quark hadrons, which should have exotic quantum numbers. Now, let us address ourself to the pentaquark state. Consider the SU(3) flavor case...
متن کاملudb̄b̄ tetraquark resonances with lattice QCD potentials and the Born-Oppenheimer approximation
We study tetraquark resonances with lattice QCD potentials computed for a static b̄b̄ pair in the presence of two lighter quarks ud, the Born-Oppenheimer approximation and the emergent wave method. As a proof of concept we focus on the system with isospin I = 0, but consider different relative angular momenta l of the heavy quarks b̄b̄. For l = 0 a bound state has already been predicted with quantu...
متن کاملInvestigation of light and heavy tetraquark candidates using lattice QCD
We review the status of an ongoing long-term lattice investigation of the spectrum and structure of tetraquark candidates. We focus on the light scalar meson a0(980). First steps regarding the study of a possibly existing ccc̄c̄ tetraquark are also outlined.
متن کاملIncluding heavy spin effects in the prediction of a b̄b̄ud tetraquark with lattice QCD potentials
We investigate spin effects in four-quark systems consisting of two heavy anti-bottom quarks and two light up/down quarks. To this end we use the Born-Oppenheimer approximation. We utilize potentials of two static antiquarks in the presence of two quarks of finite mass computed via lattice QCD and solve a coupled-channel Schrödinger equation for the anti-bottom-anti-bottom separation. Without t...
متن کاملar X iv : 0 70 7 . 12 86 v 1 [ he p - ph ] 9 J ul 2 00 7 Light 1 − + exotics : molecular resonances
Highlights in the search for nonconventional (non qq̄) meson states are the π1(1400) and π1(1600) exotic candidates. Should they exist, mounting theoretical arguments suggest that they are tetraquark molecular resonances excitable by meson rescattering. We report a new tetraquark calculation within a model field theory approximation to Quantum Chromodynamics in the Coulomb gauge supporting this ...
متن کامل