4 research outputs found

    Nonextensive statistical effects in the hadron to quark-gluon phase transition

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    We investigate the relativistic equation of state of hadronic matter and quark-gluon plasma at finite temperature and baryon density in the framework of the nonextensive statistical mechanics, characterized by power-law quantum distributions. We study the phase transition from hadronic matter to quark-gluon plasma by requiring the Gibbs conditions on the global conservation of baryon number and electric charge fraction. We show that nonextensive statistical effects play a crucial role in the equation of state and in the formation of mixed phase also for small deviations from the standard Boltzmann-Gibbs statistics.Comment: 13 pages, 10 figure

    Observation of the rare <tex>B_{S}^{0}\rightarrow\mu^{+}\mu^{-}$</tex> decay from the combined analysis of CMS and LHCb data

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    A joint measurement is presented of the branching fractions Bs0μ+μB^0_s\to\mu^+\mu^- and B0μ+μB^0\to\mu^+\mu^- in proton-proton collisions at the LHC by the CMS and LHCb experiments. The data samples were collected in 2011 at a centre-of-mass energy of 7 TeV, and in 2012 at 8 TeV. The combined analysis produces the first observation of the Bs0μ+μB^0_s\to\mu^+\mu^- decay, with a statistical significance exceeding six standard deviations, and the best measurement of its branching fraction so far, and three standard deviation evidence for the B0μ+μB^0\to\mu^+\mu^- decay. The measurements are statistically compatible with SM predictions and impose stringent constraints on several theories beyond the SM
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