On   Transverse   Momentum
Event-by-Event   Fluctuations

The phi_pt measure has been proposed to study "equilibration" in high-energy nucleus+nucleus collisions. In order to understand what the phi_pt measure is one can read the following papers:

1. M.Gazdzicki, S.Mrowczynski "A method to study "equilibration" in nucleus-nucleus collisions" Z. Phys. C54, 127 (1992)
2. S. Mrowczynski "Transverse momentum and energy correlations in the equilibrium system from high-energy nuclear collisions" Phys. Lett. B439, 6 (1998)
3. S.Mrowczynski "Generalizing phi-measure of event-by-event fluctuations in high-energy heavy-ion collisions" Phys. Lett. B465, 8 (1999)
4. H.Appelshauser et al. "Event-by-event fluctuations of average transverse momentum in central PbPb collisions at 158 GeV per nucleon" Phys. Lett. B459, 679 (1999)

There are some predictions concerning phi_pt values. If nucleus+nucleus (A+A) collision is a simple superposition of nucleon+nucleon (N+N) interations, phi_pt should be the same for both cases. On the other hand if secondary interations play an important role in A+A collisions leading the system towards the eqilibration the phi_pt value for A+A should be lower when compared to N+N interaction and in the limiting case when particles are produced independently the phi_pt should be close to zero. Therefore studying phi_pt measure can provide information about the level of equilibration in high-energy collision.

• Click here to read my MSc thesis (in Polish) (Postscript file - 4.3 MB).
• The list of vertex and track cuts.
• Transparencies shown during the Heavy Ion Forum (21.06.01 at CERN)
• Poster for QM2002 conference (4.6 MB)
  
  
  
  A list of protected pages (NA49 phi_pt analysis group):
• Comparison between new and old productions for 158 AGeV Pb+Pb data
• Plots prepared for QM2002 conference
• Phi_pt versus system size - publication and required corrections to Phys. Rev. C.
• Phi_pt energy scan . Description of urqmd1.ps , urqmd2.ps
  
  
  
  
  
  
  Ph.D. thesis - praca_KG_corrected.pdf (2.8 MB) or praca_KG_corrected.ps.gz (3.8 MB)
  
  Please note: this version of my Ph.D. thesis is slightly modified when compared to the original one (very few mistakes in edition and one inaccuracy in Introduction - corrected accordingly to the remark of one of the reviewers).