Measurement of the forward-backward asymmetry of $\Lambda$ and $\bar{\Lambda }$ production in $p\bar{p}$ collisions

Abstract

We study $\Lambda$ and $\bar{\Lambda }$ production asymmetries in $p\bar{p}\to \Lambda (\bar{\Lambda })X$, $p\bar{p}\to J/\psi \Lambda (\bar{\Lambda })X$, and $p\bar{p}\to {\mu }^{\pm }\Lambda (\bar{\Lambda })X$ events recorded by the D0 detector at the Fermilab Tevatron collider at $\sqrt{s}=1.96$ TeV. We find an excess of $\Lambda$'s ($\bar{\Lambda }$'s) produced in the proton (antiproton) direction. This forward-backward asymmetry is measured as a function of rapidity. We confirm that the $\bar{\Lambda }/\Lambda$ production ratio, measured by several experiments with various targets and a wide range of energies, is a universal function of "rapidity loss", i.e., the rapidity difference of the beam proton and the lambda.

10 pages, 12 figures, submitted to Phys. Rev. D

References in corpus (2)

• Measurements of Strange Particle Production in $p+p$ Collisions at $\sqrt{s}$= 200 GeV
• The D0 Silicon Microstrip Tracker

Cited by in corpus (1)

• Measurement of the forward-backward asymmetries in the production of $\Xi$ and $\Omega$ baryons in $p\bar{p}$ collisions