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Nuclear Transparency in Exclusive r 0 Production at HERMES. W. Lorenzon (Michigan) Collaboration. Introduction Diffractive r 0 production Nuclear Effects b N (Q 2 ) variation ( g shrinkage) coherent/incoherent cross section ratios l c -dependence

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Nuclear Transparency in Exclusive r 0 Production at HERMES

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Nuclear transparency in exclusive r 0 production at hermes

Nuclear Transparency in Exclusive r0 Production at HERMES

W. Lorenzon (Michigan)

Collaboration

  • Introduction

    • Diffractive r0 production

  • Nuclear Effects

    • bN(Q2) variation (g shrinkage)

    • coherent/incoherent cross section ratios

    • lc-dependence

    • Q2-dependence (Color Transparency)

  • Summary


Nuclear transparency in exclusive r 0 production at hermes

HERMES Experiment

at HERA (2003)


Nuclear transparency in exclusive r 0 production at hermes

The HERMES Detector


Nuclear transparency in exclusive r 0 production at hermes

Exclusive Diffractive r0 Electroproduction


Nuclear transparency in exclusive r 0 production at hermes

Evolution of Virtual Quantum States


Nuclear transparency in exclusive r 0 production at hermes

Color Transparency


Nuclear transparency in exclusive r 0 production at hermes

“Charge Screening”

Ionization


Nuclear transparency in exclusive r 0 production at hermes

Color Transparency in A(p,2p) – BNL Results


Nuclear transparency in exclusive r 0 production at hermes

Color Transparency in A(e,e’p) – SLAC/JLab Results


Nuclear transparency in exclusive r 0 production at hermes

Color Transparency in A(m,m’r0) – FNAL Results


Nuclear transparency in exclusive r 0 production at hermes

Color Transparency in A(p,di-jet) – FNAL Results


Nuclear transparency in exclusive r 0 production at hermes

Color Transparency


Nuclear transparency in exclusive r 0 production at hermes

Color Transparency and r0 Leptoproduction


Nuclear transparency in exclusive r 0 production at hermes

Exclusive Diffractive r0


Nuclear transparency in exclusive r 0 production at hermes

t’ Distributions


Nuclear transparency in exclusive r 0 production at hermes

Size of Nuclei


Nuclear transparency in exclusive r 0 production at hermes

bN (Q2) –“Photon Shrinkage”


Nuclear transparency in exclusive r 0 production at hermes

Q2 dependence of scoh / sincoh


Nuclear transparency in exclusive r 0 production at hermes

Coherence Length Dependence of ISI


Nuclear transparency in exclusive r 0 production at hermes

Incoherent Nuclear Transparency TA


Nuclear transparency in exclusive r 0 production at hermes

Coherence Length Effects


Nuclear transparency in exclusive r 0 production at hermes

HERMES acceptance in Q2 vs lc


Nuclear transparency in exclusive r 0 production at hermes

Color Transparency


Nuclear transparency in exclusive r 0 production at hermes

Summary


Nuclear transparency in exclusive r 0 production at hermes

A and Q2 dependence of scoh / sincoh


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