Eight-quark interactions as a chiral thermometer |
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Authors: | J Moreira A A Osipov B Hiller A H Blin and J Providencia |
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Institution: | (1) Department of Physics, North Carolina State University, Raleigh, North Carolina 27695-8202, USA;(2) Departamento de F?sica Te?rica I, Universidad Complutense, 28040 Madrid, Spain; |
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Abstract: | A NJL Lagrangian extended to six 1–3] and eight quark interactions 4] is applied to study temperature effects 5] (SU(3)
flavor limit, massless case), and 6] (realistic massive case). The transition temperature can be considerably reduced as
compared to the standard approach, in accordance with recent lattice calculations 7]. The mesonic spectra built on the spontaneously
broken vacuum induced by the’ t Hooft interaction strength, as opposed to the commonly considered case driven by the four-quark
coupling, undergoes a rapid crossover to the unbroken phase, with a slope and at a temperature which is regulated by the strength
of the OZI violating eight-quark interactions. This strength can be adjusted in consonance with the four-quark coupling and
leaves the spectra unchanged, except for the sigma meson mass, which decreases. A first order transition behavior is also
a possible solution within the present approach. |
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Keywords: | |
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