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Charmonium spectral functions from 2+1 flavour lattice QCD

By Szabolcs Borsányi, Stephan Dürr, Kalman Szabo, Bálint C. Tóth, Norbert Trombitás, Zoltán Fodor, Christian Hoelbling, Sándor D. Katz, Stefan Krieg, Simon Mages, Dániel Nógrádi, Attila Pásztor and Andreas Schäfer


Finite temperature charmonium spectral functions in the pseudoscalar and vector channels are studied in lattice QCD with 2+1 flavours of dynamical Wilson quarks, on fine isotropic lattices (with a lattice spacing of 0.057fm), with a non-physical pion mass of m_π ≈ 545 MeV. The highest temperature studied is approximately 1.4 T_c . Up to this temperature no significant variation of the spectral function is seen in the pseudoscalar channel. The vector channel shows some temperature dependence, which seems to be consistent with a temperature dependent low frequency peak related to heavy quark transport, plus a temperature independent term at ω > 0. These results are in accord with previous calculations using the quenched approximation

Topics: info:eu-repo/classification/ddc/530
Publisher: Springer
Year: 2014
DOI identifier: 10.1007/JHEP04(2014)132
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