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This content will become publicly available on February 9, 2017

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

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.
Authors:
 [1]
  1. Joint Institute for Nuclear Research, Dubna (Russia). et al.
Publication Date:
OSTI Identifier:
1247504
Report Number(s):
FERMILAB-PUB--15-496-E; arXiv:1511.05113
Journal ID: ISSN 2470-0010; PRVDAQ; 1404885
Grant/Contract Number:
AC02-07CH11359
Type:
Accepted Manuscript
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 93; Journal Issue: 3; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Research Org:
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 Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Orgs:
D0 Collaboration
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS