Ratios of charged antiparticles-to-particles near mid-rapidity in Au + Au collisions at sqrt[s(NN)]=130 GeV

B B Back; M D Baker; D S Barton; R R Betts; R Bindel; A Budzanowski; W Busza; A Carroll; M P Decowski; E Garcia; N George; K Gulbrandsen; S Gushue; C Halliwell; G A Heintzelman; C Henderson; R Hołyński; D Hofman; B Holzman; E Johnson; J Kane; J Katzy; N Khan; W Kucewicz; P Kulinich; W T Lin; S Manly; D McLeod; J Michałowski; A Mignerey; J Mülmenstädt; R Nouicer; A Olszewski; R Pak; I C Park; H Pernegger; C Reed; L P Remsberg; M Reuter; C Roland; G Roland; L Rosenberg; P Sarin; P Sawicki; W Skulski; S G Steadman; G S Stephans; P Steinberg; M Stodulski; A Sukhanov; J L Tang; R Teng; A Trzupek; C Vale; G J van Nieuwenhuizen; R Verdier; B Wadsworth; F L Wolfs; B Wosiek; K Woźniak; A H Wuosmaa; B Wysłouch; PHOBOS Collaboration

doi:10.1103/PhysRevLett.87.102301

Ratios of charged antiparticles-to-particles near mid-rapidity in Au + Au collisions at sqrt[s(NN)]=130 GeV

Phys Rev Lett. 2001 Sep 3;87(10):102301. doi: 10.1103/PhysRevLett.87.102301. Epub 2001 Aug 15.

Authors

B B Back¹, M D Baker, D S Barton, R R Betts, R Bindel, A Budzanowski, W Busza, A Carroll, M P Decowski, E Garcia, N George, K Gulbrandsen, S Gushue, C Halliwell, G A Heintzelman, C Henderson, R Hołyński, D Hofman, B Holzman, E Johnson, J Kane, J Katzy, N Khan, W Kucewicz, P Kulinich, W T Lin, S Manly, D McLeod, J Michałowski, A Mignerey, J Mülmenstädt, R Nouicer, A Olszewski, R Pak, I C Park, H Pernegger, C Reed, L P Remsberg, M Reuter, C Roland, G Roland, L Rosenberg, P Sarin, P Sawicki, W Skulski, S G Steadman, G S Stephans, P Steinberg, M Stodulski, A Sukhanov, J L Tang, R Teng, A Trzupek, C Vale, G J van Nieuwenhuizen, R Verdier, B Wadsworth, F L Wolfs, B Wosiek, K Woźniak, A H Wuosmaa, B Wysłouch; PHOBOS Collaboration

Affiliation

¹ Physics Division, Argonne National Laboratory, Argonne, Illinois 60439-4843, USA.

PMID: 11531474
DOI: 10.1103/PhysRevLett.87.102301

Abstract

We have measured the ratios of antiparticles to particles for charged pions, kaons, and protons near mid-rapidity in central Au+Au collisions at sqrt[s(NN)] = 130 GeV. We observe <pi(-)>/<pi(+)> = 1.00+/-0.01(stat)+/-0.02(syst), <K->/<K+> = 0.91+/-0.07(stat)+/-0.06(syst), and <p>/<p> = 0.60+/-0.04(stat)+/-0.06(syst). The <K->/<K+> and <p>/<p> ratios give a consistent estimate of the baryo-chemical potential mu(B) of 45 MeV, a factor of 5-6 smaller than in central Pb+Pb collisions at sqrt[s(NN)] = 17.2 GeV.