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star physics results: Spectra and yields

Anti-baryon to baryon ratios are close to unity

The anti-baryon to baryon ratio supplies information about the amount of baryon transfer from the colliding nuclei to the central collision region. At RHIC there is a gap of 12 rapidity units between the two beams. More...

Statistical models can be used to predict particle ratios

By studying the various ratios of particles created in heavy ion collisions we can learn about the chemical properties of the source. If particles are created in a thermally equilibrated medium the hadronic ratios can be predicted via the use of conservation laws with the only necessary free parameters being the chemical temperature and the baryochemical potential. More...

Systematics of the K/pi ratio

Kaons carry ~90% of the strange quarks produced in a collision hence the K/pi ratio can be used to study strangeness production and the possibility of strangeness enhancement. As the pi+yield ~ pi- yield it is possible to compare the STAR K+/pi- results to lower energy results on the K+/pi+. More...

Measurement of Inclusive Antiprotons from Au+Au Collisions at sqrt(sNN) = 130 GeV

The measurement of the pbar/p ratio of 0.73 at midrapidity in minimum bias Au+Au collisions at RHIC indicates that a finite net-baryon number is present at midrapidity. This implies that a finite baryon number has been transported over 5 units of rapidity in these collisions. More...

Antideuteron and Antihelium Production in Au+Au Collisions at sqrt(snn) = 130 GeV

The production of antinuclei at RHIC energies is possible via two mechanisms. The first mechanism is direct production of nucleus-antinucleus pairs in elementary nucleon-nucleon or parton-parton interactions. Because of their small binding energies, nuclei or antinuclei produced via early direct production are likely to be dissociated in the medium before escaping. More...

Multiplicity and Spectra of Negatively Charged Hadrons in Au+Au Collisions at sqrt(snn) = 130 GeV

The multiplicity and inclusive single particle pT distributions of hadrons are important tools for understanding the evolutionary path of the system created in heavy-ion collisions and help to determine the characteristics of the early, hot, and dense phase.

Particle production was studied in Au+Au collisions at sqrt(snn) = 130 GeV at STAR through the yield of primary negative hadrons, comprising mostly pi- and an admixture of K- and pbar. The h- distribution includes the products of strong and electromagnetic decays. More...

Midrapidity Antiproton-to-Proton Ratio from Au+Au Collisions at sqrt(snn) = 130 GeV

The primary goal of the heavy-ion collision program at the Relativistic Heavy Ion Collider (RHIC) is to create and study a novel state of matter constituted of deconfined quarks and gluons, named quark-gluon plasma. The formation of such a deconfined state depends on the initial conditions of the matter created at the early stage of heavy-ion collisions. More...

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