Journal
PHYSICAL REVIEW LETTERS
Volume 105, Issue 25, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.105.252002
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Funding
- U.S. Department of Energy [DE-FG02-05ER41367, DE-FG02-01ER41190]
- BMBF
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Finite temperature lattice simulations of quantum chromodynamics (QCD) are sensitive to the hadronic mass spectrum for temperatures below the critical'' temperature T-c approximate to 160 MeV. We show that a recent precision determination of the QCD trace anomaly shows evidence for the existence of a large number of hadron states beyond those known from experiment. The lattice results are well represented by an exponentially growing mass spectrum up to a temperature T = 155 MeV. Using simple parametrizations of the hadron mass spectrum we show how one may estimate the total spectral weight in these yet undermined states.
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