Onset of asymptotic scaling in deuteron photodisintegration

Details Onset of asymptotic scaling in deuteron photodisintegration Onset of asymptotic scaling in deuteron photodisintegration

2004-05-21

arxiv.org/abs/hep-ph/0405207v4

Phys.Rev.Lett.94:012301,2005

Physics

High Energy Physics

High Energy Physics - Phenomenology

Accepted by PRL; 5 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.94.012301

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.

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