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The spin-orbit potential and Poincaré invariance in finite temperature pNRQCD

The spin-orbit potential and Poincaré invariance in finite temperature pNRQCD,10.1007/JHEP07(2011)096,Journal of High Energy Physics,Nora Brambilla,Mi

The spin-orbit potential and Poincaré invariance in finite temperature pNRQCD   (Citations: 1)
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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 pNRQCDHTL, where degrees of freedom with energy or momentum larger than the binding energy have been integrated out. Thermal effects are expected to break Poincaré 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 pNRQCDHTL and show that Poincaré invariance is indeed violated.
Journal: Journal of High Energy Physics - J HIGH ENERGY PHYS , vol. 2011, no. 7, pp. 1-18, 2011
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