Kaon production and kaon to pion ratio in Au+Au collisions at {radical}{ovr s}{sub NN}=130 GeV

Mid-rapidity transverse mass spectra and multiplicity densities of charged and neutral kaons are reported for Au+Au collisions at {radical}{ovr S{sub NN}}=130 GeV at RHIC. The spectra are exponential in transverse mass, with an inverse slope of about 280 MeV in central collisions. The multiplicity d...

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Bibliographic Details
Published in:	Physics letters. B 2004-08, Vol.595 (Aug. 12, 2004)
Main Authors:	Adler, C., Ahammed, Z., Allgower, C., Amonett, J., Anderson, B. D., Cadman, R. V., Krueger, K., Spinka, H. M., Underwood, D. G., STAR Collaboration, High Energy Physics, Univ. of Frankfurt, Purdue Univ, Indiana Univ, Kent State Univ
Format:	Article
Language:	eng
Subjects:	BROOKHAVEN RHIC CHARGED PARTICLES COLLISIONS DENSITY HADRONS ION COLLISIONS KAONS KAONS NEUTRAL MASS MASS SPECTRA MULTIPLICITY NUCLEAR PHYSICS AND RADIATION PHYSICS PARTICLE ACCELERATORS PARTICLE PRODUCTION PARTICLE RAPIDITY PARTICLES PIONS PRODUCTION RELATIVISTIC RANGE SPECTRA
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Summary:	Mid-rapidity transverse mass spectra and multiplicity densities of charged and neutral kaons are reported for Au+Au collisions at {radical}{ovr S{sub NN}}=130 GeV at RHIC. The spectra are exponential in transverse mass, with an inverse slope of about 280 MeV in central collisions. The multiplicity densities for these particles scale with the negative hadron pesudo-rapidity density. The charged kaon to pion ratios are K{sup +}/{Pi}{sup -}=0.161{+-}0.002(stat){+-}0.024(syst) and K{sup -}/{Pi}{sup -}=0.146{+-}0.002(stat){+-}0.022(syst) for the most central collisions. The K{sup +}/{Pi}{sup -} ratio is lower than the same ratio observed at the SPS while the K{sup -}/{Pi}{sup -} is higher than the SPS result. The ratios are enhanced by about 50% relative to p+p and {anti p}+p collision data at similar energies.
ISSN:	0370-2693 1873-2445