Proton-{Lambda} correlations in central Au+Au collisions at {radical}{ovr s}{sub NN} = 200 GeV.
We report on p-{Lambda}, p-{bar {Lambda}}, {bar p}-{Lambda}, and {bar p}-{bar {Lambda}} correlation functions constructed in central Au-Au collisions at {radical}s{sub NN} = 200 GeV by the STAR experiment at RHIC. The proton and lambda source size is inferred from the p-{Lambda} and {bar p}-{bar {Lambda}} correlation functions. It is found to be smaller than the pion source size also measured by the STAR experiment at smaller transverse masses, in agreement with a scenario of a strong universal collective flow. The p-{bar {Lambda}} and {bar p}-{Lambda} correlation functions, which are measured for the first time, exhibit a large anticorrelation. Annihilation channels and/or a negative real part of the spin-averaged scattering length must be included in the final-state interactions calculation to reproduce the measured correlation function.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC); National Science Foundation (NSF); Swiss NSF
- DOE Contract Number:
- DE-AC02-06CH11357
- OSTI ID:
- 966338
- Report Number(s):
- ANL-HEP-PR-09-66; PRVCAN; TRN: US0903945
- Journal Information:
- Phys. Rev. C, Vol. 74, Issue 74 ; 2006; ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- ENGLISH
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