Correlations and Fluctuations

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Correlations and Fluctuations Scott Pratt, Michigan State University prattsc@msu.edu Interference from a coherent probe Femtoscopy Topics Some Perspective Theory Koonin Equation Bose-Einstein/Coulomb/Strong Interactions Shapes and Sizes (Imaging) Multi-particle symmetrization Phenomenology Entropy Lifetimes Collective Expansion Testing Models Blast Wave Hydro/Micro Eq. of State & Viscosity Interference from a coherent probe Source could be: on-shell photon off-shell photon neutrons off-shell W/Z bosons... Interference survives even if particles sample slit one particle at at time Two-slit diffraction Intensity Interferometry Peterson et al, cond-mat/0009364 HBT R.Hanbury-Brown and R.Twiss, Nature 170, p. 1447 (1956) Long lived sources require constraint in t1-t2 Enhancement TC = coincidence time Detector Separation (mm) T0 = coherence time Interference from identical bosons < cos!k!r >

HBT Hanbury-Brown and Twiss, Nature 170, p. 1447 (1956) HBT can be applied to sources of all sizes Definition of Correlation Function Usually defined in c.o.m. frame Narrabri Stellar Intensity Interferometer, Australia Measured diameter of Sirius in 1962 Established temperature scales of hot stars Sources of Correlation Collective flow Jets Inhomogeneities & instabilities (e.g. droplets) Resonances Charge conservation Final-state interactions Femtoscopy Visually... Koonin Equation Source Function Relative Wave Function q and r evaluated in c.o.m. Deriving Koonin s Equation The WHOLE truth SP(r) samples relative positions At some point, every particle acts like plane wave Goal: Deconvolute C(q) -> S(r)

Approximation #1 Ignore symmetrization with others Approximation #2 Uncorrelated Emission Allows definition of s(p,x): Evolution matrices Approximation #3 (identical part.s) smoothness approx. Approximations 3,4 (potential int.s) 3. Smoothness approximation characteristic scale of " 2 4. Equal time approximation Smoothness approximation (q is small) Koonin s Equation Validity of Koonin Equation 1. Ignore multi-part symmetrization: Excellent for low phase space density (pt>200 MeV/c) 2. Uncorrelated emission: Excellent for heavy ions 3. Smoothness: Excellent for large hot sources (bad for pp collisions) 4. Equal times: irrelevant for Bose interference, consistent with statistical equilibrium For RHIC/LHC: dimensions believable to: pions!5%, pp!10%, K+K-! could be poor,... Koonin Equation Inverting the Koonin Equation: Kernel Total momentum P suppressed Similar to matrix inversion

Inversion: Bose interference Inversion: potential interactions Typically singular Projection into harmonics useful " 2 properties related to phase shifts Simple Fourier transform Both S(r) and R(q) are even functions Angular projections Koonin Eq. (Projection Version) Reduced to 1-d problems Convenient views of 3-d information Resolving power of kernels?? Spherical harmonics: (lx,ly,lz)->(l,m) 2 3 Classes of Interaction C(q) III. Strong Interaction C(q) I. Bose Interference 1 q 1 C(q) q 1 (2me2/R)1/2 II. Coulomb q pp correlations have it all 3 Classes of Interaction

Bose Interference: easily invertible Kernels Phase Shifts, Wave Functions and the Density of States Strong interactions depend on phase shifts Furthermore Kl"0 for all l, even if #l=0 Kl!rl Coulomb funky quantum mechanics Funky Coulomb Stuff Non-analytic for q,r -> 0 Coulomb effects can be approximately factored away for!!, Random Topic #1 A Classical Perspective for Wave Functions For qr>>1, Koonin Eq. equivalent to thermal equilibrium Imaging (Resolving Power) Determining S0(r)!!, KK! 3-4 parameters others! 2-3 parameters Determining Shape!!, l=0,2,4,6 others, l=0,1,2(3) Random Topic #2 Multi-Particle Symmetrization Consider system with A bosons 100! terms YIKES!!!!!!

Permutation Diagrams Spectra and Correlations Analytic integrals for Gaussian or box Distortions to Correlations Distorted Multiplicity Distribution