4,594 research outputs found

    Squeezed Fermions at Relativistic Heavy Ion Colliders

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    Large back-to-back correlations of observable fermion -- anti-fermion pairs are predicted to appear, if the mass of the fermions is modified in a thermalized medium. The back-to-back correlations of protons and anti-protons are experimentally observable in ultra-relativistic heavy ion collisions, similarly to the Andreev reflection of electrons off the boundary of a superconductor. While quantum statistics suppresses the probability of observing pairs of fermions with nearby momenta, the fermionic back-to-back correlations are positive and of similar strength to bosonic back-to-back correlations.Comment: LaTeX, ReVTeX 12 pages, uses epsf.sty, 2 eps figures, improved presentatio

    Back-to-Back Correlations for Finite Expanding Fireballs

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    Back-to-Back Correlations of particle-antiparticle pairs are related to the in-medium mass-modification and squeezing of the quanta involved. They are predicted to appear when hot and dense hadronic matter is formed in high energy nucleus-nucleus collisions. The survival and magnitude of the Back-to-Back Correlations of boson-antiboson pairs generated by in-medium mass modifications are studied here in the case of a thermalized, finite-sized, spherically symmetric expanding medium. We show that the BBC signal indeed survives the finite-time emission, as well as the expansion and flow effects, with sufficient intensity to be observed at RHIC.Comment: 24 pages, 4 figure

    Pentaquarks in the medium in the quark-meson coupling model

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    We calculate the properties of the pentaquarks Θ+\Theta^+ and Ξ,0\Xi^{--,0} in symmetric nuclear matter using the quark meson coupling model (QMC). The stability of the Θ+\Theta^+ in the medium with respect to the channel Θ+NK+\Theta^+\to NK^+ is discussed.Comment: 6 pages, 5 figures, revte

    Low-Angle X-Ray Measurements on Air-Driep and Alkali-Treated Macromolecular Systems-Wool

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    Determination of the Relative Distribution of Layers in Densely Packed Colloidal Systems-Wool

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    Estimation of Air-Fraction, Specific Surface and Other Parameters of Micelle Systems-Wool-Low Angle X-Ray Methods

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