Evidence for $ρ^{0}$ Mass Modification in the $^{3} He (γ, ρ^{0}) ppn$ Reaction

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12 January 1998

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 80 (2) , 241-244
https://doi.org/10.1103/physrevlett.80.241

Abstract

Evidence for a modification of the

ρ^{0}

mass in the nuclear medium via the

^{3} He (γ, π^{+} π^{-}) X

reaction is reported here. The tagged photon energies were mostly below the

ρ^{0}

production threshold on a free nucleon, and the bound nucleon's Fermi momentum was utilized to produce the

ρ^{0}

. The mass shift observed is

δ m_{ρ^{0}} = 160 \pm 35 MeV {/ c}^{2}

and is significantly larger than theoretical model predictions for this nucleus and nuclear matter density.

Keywords

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