PHOTON AND MESON PRODUCTION IN ULTRA-RELATIVISTIC NUCLEUS-NUCLEUS COLLISIONS
作者： Herbert Löhner
DOI: 10.1007/978-1-4615-2558-5_8
关键词: Quark 、 Parton 、 Baryon 、 Particle physics 、 Quark–gluon plasma 、 Gluon 、 Physics 、 Quantum chromodynamics 、 Meson 、 Nuclear density
摘要: In high-energy collisions of heavy nuclei the interaction baryons and their parton constituents leads to abundant production mesons, so that a hadronic system is created with particle density much larger than mere baryonic superposition 2γρ 0. Here ρ 0 normal nuclear 0.17/fm3 γ center-of-mass Lorentz factor value ≈ 10 at SPS energy 200 GeV/nucleon. Collisions among dense lead thermal excitation. Eventually, physical situation similar big-bang scenario might thus be established in laboratory. This allows investigate existence nature phase transition quark matter1 which predicted by QCD lattice calculations2, 3, 4, 5 hadronic-matter systems high density. The study thermodynamic behaviour strongly-interacting-matter will provide an interesting test confinement property QCD. elementary gluon weakend colour screening very short distances. Sufficiently hot matter should therefore become gas noninteracting quarks gluons move quasifreely deconfined but overall neutral environment given dimensions dense-matter volume. Numerical simulations statistical non-perturbative sector are time-consuming calculations still suffer from severe approximations. These refer quark-masses limited size. order not firmly predicted. Calculations infinitly large or zero masses yield first-order transition, while finite (m u,d = MeV, m s MeV) seem indicate second-order change5.
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