Electric charge fluctuations from lattice QCD in the continuum limit
Abstract
Electric charge fluctuations χnQ allow comparisons between theory and experiment, but are elusive on the lattice due to severe cutoff effects. We use a 4HEX action to obtain χ2Q and, for the first time ever, χ4Q in the continuum limit. We find disagreement with the hadron resonance gas (HRG) model, which we cannot explain with finite volume effects. We include light meson interactions in the HRG model via the S-matrix, reducing the tension for χ4Q, but worsening the agreement for χ2Q. We propose measuring the ratio χ4Q/χ2Q at the LHC to investigate this tension.
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