Wednesday·April 20, 2016

[Submitted on 18 Apr 2016] (cross-list from hep-ph)

Ratio between two $\Lambda$ and $\bar{\Lambda }$ production mechanisms in $p$ scattering

B. Hoeneisen🇪🇨

We consider $\Lambda$ and $\bar{\Lambda }$ production in a wide range of proton scattering experiments. The produced $\Lambda$ and $\bar{\Lambda }$ may or may not contain a diquark remnant of the beam proton. The ratio of these two production mechanisms is found to be a simple universal function $r=[\kappa /(y_p-y){]}^i$ of the rapidity difference $y_p-y$ of the beam proton and the produced $\Lambda$ or $\bar{\Lambda }$, valid over four orders of magnitude, from $r\approx 0.01$ to $r\approx 100$, with $\kappa =2.86\pm 0.03\pm 0.07$, and $i=4.39\pm 0.06\pm 0.15$.