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

Journal Article · Tue Feb 09 00:00:00 UTC 2016 · Physical Review D

DOI: https://doi.org/10.1103/PhysRevD.93.032002 · OSTI ID:1247504

Abazov, Victor Mukhamedovich ^[1]

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1. Joint Institute for Nuclear Research, Dubna (Russia). et al.

Here, we study $$\Lambda$$ and $$\bar{\Lambda}$$ production asymmetries in $$p \bar{p} \rightarrow \Lambda (\bar{\Lambda}) X$$, $$p \bar{p} \rightarrow J/\psi \Lambda (\bar{\Lambda}) X$$, and $$p \bar{p} \rightarrow \mu^\pm \Lambda (\bar{\Lambda}) X$$ 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.

• Research Organization: Brookhaven National Laboratory (BNL), Upton, NY (United States); Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
• Sponsoring Organization: USDOE; USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
• Contributing Organization: D0 Collaboration
• Grant/Contract Number: AC02-07CH11359
• OSTI ID: 1247504
• Report Number(s): FERMILAB-PUB--15-496-E; arXiv:1511.05113; 1404885
• Journal Information: Physical Review D, Journal Name: Physical Review D Journal Issue: 3 Vol. 93; ISSN PRVDAQ; ISSN 2470-0010
• Publisher: American Physical Society (APS)Copyright Statement
• Country of Publication: United States
• Language: English