We calculate the string tension and 0⁺⁺ and 2⁺⁺ glueball masses in pure gauge QCD using an improved lattice action. We compare various smearing methods, and find that the best glueball signal is obtained using smeared Wilson loops of a size of about 0.5 fm. Our results for mass ratios m_0⁺⁺√σ=3.5(3) and m_2⁺⁺m_0⁺⁺=1.6(2) are consistent with those computed with the simple plaquette action.
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Gupta et al. (1991) studied this question.
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