The effects of masses of quarks and light gluions on the temperature of Quark-Gluon Plasma(QGP)is taken into account in Massachusetts Institute of Technology(MIT)bag model while freeze-out of quarks from QGP is discussed in the break-up model.It turns out that in the last stage of development of QGP,quark species will freeze-out in the heavier to lighter order,which may not be changed by unavoidable production of other particles(e.g.,gluions).
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