A first look at Au+Au collisions at RHIC energies using the PHOBOS detector |
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| Institution: | (1) Argonne National Laboratory, 60439 Argonne, IL, USA;(2) Brookhaven National Laboratory, 11973 Upton, NY, USA;(3) Institute of Nuclear Physics, Kraków, Poland;(4) Massachusetts Institute of Technology, 02139 Cambridge, MA, USA;(5) National Central University, Chung-Li, Taiwan;(6) University of Illinois at Chicago, 60607 Chicago, IL, USA;(7) University of Maryland, 20742 College Park, MD, USA;(8) University of Rochester, 14627 Rochester, NY, USA |
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| Abstract: | The PHOBOS detector has been used to study Au + Au collisions at√sNN = 56,130, and 200 GeV Several global observables have been measured and the results are compared with theoretical models.
These observables include the charged-particle multiplicity measured as a function of beam energy, pseudo-rapidity, and centrality
of the collision. A unique feature of the PHOBOS detector is its almost complete angular coverage such that these quantities
can be studied over a pseudo-rapidity interval of |η|≤5.4. This allows for an almost complete integration of the total charged
particle yield, which is found to be about N
ch
tot
= 4200 ±470 at √sNN = 130 GeV and N
ch
tot
= 5300 ±530 at √sNN = 200 GeV.
The ratio of anti-particles to particles emitted in the mid-rapidity region has also been measured using the PHOBOS magnetic
spectrometer. Of particular interest is the ratio of anti-protons to protons in the mid-rapidity region, which was found to
be (i.e.921-1) at √sNN = 130 GeV. This high value suggests that an almost baryon-free region has been produced in the collisions. |
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| Keywords: | Charged particle multiplicity ultra-relativistic heavy-ion collisions |
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