10,994 research outputs found
j_psi Suppression and the Quark-Gluon Plasma
All measured Feynman x_f distributions of the ratio, R, of j_psi production
in nuclei relative to production on protons fall off with x_f.
They show [2] that absorption of charmonium cannot be the only source of
j_psi suppression and that energy loss of the constituents of the incident
proton prior to the j_psi production, because of the exponential sqrt(s)
dependence of the charmonium cross section, should not be neglected. Including
the effects of initial state energy loss we find that the latest measured
Pb-Pb j_psi cross sections do not provide any evidence for deconfinement.Comment: 9 pages, 2 figures, additional material, accepted by Physics Letter
Kakutani Dichotomy on Free States
Two quasi-free states on a CAR or CCR algebra are shown to generate
quasi-equivalent representations unless they are disjoint.Comment: 12 page
Goodness-of-Fit Tests for Symmetric Stable Distributions -- Empirical Characteristic Function Approach
We consider goodness-of-fit tests of symmetric stable distributions based on
weighted integrals of the squared distance between the empirical characteristic
function of the standardized data and the characteristic function of the
standard symmetric stable distribution with the characteristic exponent
estimated from the data. We treat as an unknown parameter,
but for theoretical simplicity we also consider the case that is
fixed. For estimation of parameters and the standardization of data we use
maximum likelihood estimator (MLE) and an equivariant integrated squared error
estimator (EISE) which minimizes the weighted integral. We derive the
asymptotic covariance function of the characteristic function process with
parameters estimated by MLE and EISE. For the case of MLE, the eigenvalues of
the covariance function are numerically evaluated and asymptotic distribution
of the test statistic is obtained using complex integration. Simulation studies
show that the asymptotic distribution of the test statistics is very accurate.
We also present a formula of the asymptotic covariance function of the
characteristic function process with parameters estimated by an efficient
estimator for general distributions
CP^1+U(1) Lattice Gauge Theory in Three Dimensions: Phase Structure, Spins, Gauge Bosons, and Instantons
In this paper we study a 3D lattice spin model of CP Schwinger-bosons
coupled with dynamical compact U(1) gauge bosons. The model contains two
parameters; the gauge coupling and the hopping parameter of CP bosons. At
large (weak) gauge couplings, the model reduces to the classical O(3) (O(4))
spin model with long-range and/or multi-spin interactions. It is also closely
related to the recently proposed "Ginzburg-Landau" theory for quantum phase
transitions of quantum spin systems on a 2D square lattice at zero
temperature. We numerically study the phase structure of the model by
calculating specific heat, spin correlations, instanton density, and
gauge-boson mass. The model has two phases separated by a critical line of
second-order phase transition; O(3) spin-ordered phase and spin-disordered
phase. The spin-ordered phase is the Higgs phase of U(1) gauge dynamics,
whereas the disordered phase is the confinement phase. We find a crossover in
the confinement phase which separates dense and dilute regions of instantons.
On the critical line, spin excitations are gapless, but the gauge-boson mass is
{\it nonvanishing}. This indicates that a confinement phase is realized on the
critical line. To confirm this point, we also study the noncompact version of
the model. A possible realization of a deconfinement phase on the criticality
is discussed for the CP+U(1) model with larger .Comment: Discussion of finite size scaling, O(4) spin correlation adde
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