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We study a QCD sum rule analysis for an exotic tetraquark ud bar[s] bar[s] ofJ^P=0^+ and I = 1. We construct q q bar[q] bar[q] currents in a local productform and find that there are five independent currents for this channel. Due tohigh dimensional nature of the current, it is not easy to form a good sum rulewhen using a single current. This means that we do not find any sum rule windowto extract reliable results, due to the insufficient convergence of the OPE andto the exceptional important role of QCD continuum. Then we examine sum rulesby using currents of linear combinations of two currents among the independentones. We find two reasonable cases that predict a mass of the tetraquark around1.5 GeV.Comment: 15 pages, 8 figures, revised versio

physical review. d. particles, fields, gravitation, and cosmology/physical review. d, particles, fields, gravitation, and cosmology

Exotic tetraquark<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>u</mml:mi><mml:mi>d</mml:mi><mml:mover accent="true"><mml:mi>s</mml:mi><mml:mo>¯</mml:mo></mml:mover><mml:mover accent="true"><mml:mi>s</mml:mi><mml:mo>¯</mml:mo></mml:mover></mml:math>of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>J</mml:mi><mml:mi>P</mml:mi></mml:msup><mml:mo>=</mml:mo><mml:msup><mml:mn>0</mml:mn><mml:mo>+</mml:mo></mml:msup></mml:…

Exotic tetraquarkuds¯s¯ofJP=0+