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A first look at Au+Au collisions at RHIC energies using the PHOBOS detector

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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 totch = 4200 ±470 at √sNN = 130 GeV and N totch = 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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Authors and Affiliations

  1. Argonne National Laboratory, 60439, Argonne, IL, USA

    Birger Back, N. George & A. H. Wuosmaa

  2. Brookhaven National Laboratory, 11973, Upton, NY, USA

    M. D. Baker, D. S. Barton, A. Carroll, J. Corbo, S. Gushue, G. A. Heintzelman, D. Hicks, B. Holzman, A. Olszewski, R. Pak, M. Rafelski, L. P. Remsberg, P. Steinberg & A. Sukhanov

  3. Institute of Nuclear Physics, Kraków, Poland

    A. Budzanowski, R. Holyńiski, B. Holzman, J. Michalowski, A. Olszewski, P. Sawicki, M. Stodulski, A. Trzupek, B. Wosiek & K. Woźniak

  4. Massachusetts Institute of Technology, 02139, Cambridge, MA, USA

    W. Busza, M. P. Decowski, K. Gulbrandsen, C. Henderson, J. L. Kane, J. Katzy, P. Kulinich, J. Mülmenstädt, H. Pernegger, M. Rbeiz, C. Reed, C. Roland, G. Roland, L. Rosenberg, P. Sarin, S. G. Steadman, G. S. F. Stephans, C. Vale, G. J. van Nieuwenhuizen, R. Verdier, B. Wadsworth & B. Wyslouch

  5. National Central University, Chung-Li, Taiwan

    C. M. Kuo, W. T. Lin & J-L. Tang

  6. University of Illinois at Chicago, 60607, Chicago, IL, USA

    R. R. Betts, E. Garcia, C. Halliwell, D. J. Hofman, R. Hollis, A. Iordanova, J. Katzy, W. Kucewicz, D. McLeod, R. Nouicer, M. Reuter & J. Sagerer

  7. University of Maryland, 20742, College Park, MD, USA

    R. Bindel & A. C. Mignerey

  8. University of Rochester, 14627, Rochester, NY, USA

    J. Hamblen, E. Johnson, N. Khan, S. Manly, I. C. Park, W. Skulski, R. Teng & F. L. H. Wolfs

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  1. Birger Back
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Back, B., Baker, M.D., Barton, D.S. et al. A first look at Au+Au collisions at RHIC energies using the PHOBOS detector. Pramana - J Phys 60, 921–931 (2003). https://doi.org/10.1007/BF02707011

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