Articles written in Pramana – Journal of Physics
Volume 60 Issue 5 May 2003 pp 921-931
Birger Back M D Baker D S Barton R R Betts R Bindel A Budzanowski W Busza A Carroll J Corbo M P Decowski E Garcia N George K Gulbrandsen S Gushue C Halliwell J Hamblen G A Heintzelman C Henderson D Hicks D J Hofman R Hollis R Holyńiski B Holzman A Iordanova E Johnson J L Kane J Katzy N Khan W Kucewicz P Kulinich C M Kuo W T Lin S Manly D McLeod J Michalowski A C Mignerey J Mülmenstädt R Nouicer A Olszewski R Pak I C Park H Pernegger M Rafelski M Rbeiz C Reed L P Remsberg M Reuter C Roland G Roland L Rosenberg J Sagerer P Sarin P Sawicki W Skulski S G Steadman P Steinberg G S F Stephans M Stodulski A Sukhanov J-L Tang R Teng A Trzupek C Vale G J van Nieuwenhuizen R Verdier B Wadsworth F L H Wolfs B Wosiek K Woźniak A H Wuosmaa B Wyslouch
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 Nchtot= 4200 ±470 at √sNN = 130 GeV and Nchtot = 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.
Volume 93 | Issue 6
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