Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-05-24
JHEP07(2011)096
Physics
High Energy Physics
High Energy Physics - Phenomenology
17 page, 4 figures. Version published on JHEP
Scientific paper
10.1007/JHEP07(2011)096
Heavy quarkonium at finite temperature has been the subject of intense theoretical studies, for it provides a potentially clean probe of the quark-gluon plasma. Recent studies have made use of effective field theories to exploit in a systematic manner the hierarchy of energy scales that characterize the system. In the case of a quarkonium in a medium whose temperature is smaller than the typical momentum transfer in the bound state but larger than its energy, the suitable effective field theory is pNRQCD_HTL, where degrees of freedom with energy or momentum larger than the binding energy have been integrated out. Thermal effects are expected to break Poincar\'e invariance, which, at zero temperature, manifests itself in a set of exact relations between the matching coefficients of the effective field theory. In the paper, we evaluate the leading-order thermal corrections to the spin-orbit potentials of pNRQCD_HTL and show that Poincar\'e invariance is indeed violated.
Brambilla Nora
Escobedo Miguel Angel
Ghiglieri Jacopo
Vairo Antonio
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