Strange hadron production in d+Au collisions at RHIC |
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Authors: | Hai Jiang Xiangzhou Cai |
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Institution: | 1. Department of Physics and Astronomy, University of California, 90095, Los Angeles, California, USA 2. Shanghai Institute of Applied Physics, 201800, Shanghai, People’s Republic of China
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Abstract: | We report the centrality dependence of transverse mass (m t ) spectra at mid-rapidity for the identified strange hadrons K S 0 , ? $\Lambda + \bar \Lambda $ and $\Xi ^ - + \bar \Xi ^ + $ in d+Au collisions at RHIC. The measured transverse momentum (p T ) covers 0.4<p T <6.0 GeV/c for K S 0 , ø, $\Lambda + \bar \Lambda $ and 0.6<p T <5.0 GeV/c for $\Xi ^ - + \bar \Xi ^ + $ . The binary collision normalized nuclear modification factors R CP of these hadrons indicate that the Cronin effect in d+Au collisions has a distinct particle-type dependence. the R CP ratios show a distinct baryons versus mesons dependence: the R CP for $\Xi ^ - + \bar \Xi ^ + $ follows that for $\Lambda + \bar \Lambda $ while the R CP for the ? is close to that for the K S 0 . Similar features have also been observed in Au+Au collisions. Initial parton scattering alone is not sufficient to explain this particle-type dependence. Hadronization processes are likely to be important for determining hadron properties in high-energy collisions as suggested by coalescence and recombination models. |
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