Onset of asymptotic scaling in deuteron photodisintegration

Abstract

We investigate the transition from the nucleon-meson to quark-gluon description of the strong interaction using the photon energy dependence of the $d(\gamma ,p)n$ differential cross section for photon energies above 0.5 GeV and center-of-mass proton angles between $30^{\circ }$ and $150^{\circ }$. A possible signature for this transition is the onset of cross section $s^{-11}$ scaling with the total energy squared, $s$, at some proton transverse momentum, $P_T$. The results show that the scaling has been reached for proton transverse momentum above about 1.1 GeV/c. This may indicate that the quark-gluon regime is reached above this momentum.

Accepted by PRL; 5 pages, 2 figures

References in corpus (1)

• Complete Angular Distribution Measurements of Two-Body Deuteron Photodisintegration between 0.5 and 3 GeV

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