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American Physical Society, Physical Review D, 3(93), 2016

DOI: 10.1103/physrevd.93.032002

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

Journal article published in 2015 by Victor Mukhamedovich Abazov, Braden Keim Abbott, Bannanje Sripath Acharya, Mark Raymond Adams, Todd Adams, James P. Agnew, Guennadi D. Alexeev, Georgiy D. Alkhazov, Andrew K. Alton, Andrew Warren Askew, Scott Atkins, Kamil Augsten, Carlos A. Avila, Linda F. Bagby, Boris Baldin and other authors.
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

10 pages, 12 figures, submitted to Phys. Rev. D ; see paper for full list of authors ; We study $Λ$ and $\bar{\Lambda}$ production asymmetries in $p \bar{p} → Λ (\bar{\Lambda}) X$, $p \bar{p} → J/ψ Λ (\bar{\Lambda}) X$, and $p \bar{p} → μ^± Λ (\bar{\Lambda}) X$ events recorded by the D0 detector at the Fermilab Tevatron collider at $\sqrt{s} = 1.96$ TeV. We find an excess of $Λ$'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 $\bar{\Lambda}/Λ$ 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.