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Experiment Summary

This summary highlights the new experimental results related to baryons and anti-baryons, focusing on the top 10 baryon findings showcased at QM2002. The experimental consistency among different studies is emphasized, showcasing the significance of these results. The discussion covers topics such as ratios at different energies, rapidity loss, degree of strangeness saturation, charmed baryons, and balance functions for baryons. The presentation also delves into the rapidity distribution of p-p and the L-L as well as pdirect-pdirect measurements in Au+Au collisions at various energies. Additionally, the text touches on the accurate pt measurements in near-peripheral collisions and examines the behavior of ratios such as p/p and K/p in different collision scenarios. The goal is to provide a comprehensive overview of the important baryon-related findings discussed at the conference and lay the groundwork for further research in this area.

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Experiment Summary

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  1. Experiment Summary Craig Ogilvie Iowa State University, cogilvie@iastate.edu • Highlights of new results shown at this meeting • Experimental consistency between experiments • baryons, anti-baryons • Top 10 “Baryon” results I’m excited to see at QM2002 (and beyond)

  2. Ratios @ 200 AGeV (I): BRAHMS Craig Ogilvie

  3. 200 GeV Ratios from PHOBOS Craig Ogilvie

  4. pp ->pbar and pn->Pbar 158 GeV Craig Ogilvie

  5. pAu => L, 18 GeV/c E910 Phys.Rev.Lett. 85 (2000) 4868 Increase in L with n reproduces much of A+A strangeness Craig Ogilvie

  6. Rapidity Loss AGS Craig Ogilvie

  7. Baryons, Experiment Consistency (I) Craig Ogilvie

  8. Message • Experimental results are consistent with each other • STAR’s improved dN/dy analysis (more constraint on shape) • well within the systematic errors quoted by their papers Craig Ogilvie

  9. Baryons, Experiment Consistency (II) Craig Ogilvie

  10. Top 10 “Baryon” Results I’m Looking Forward toAt QM and Beyond

  11. 10: Systematics • p+p @ 200 GeV => hadron spectra and yields • p+-, K+-, p, p, L, L, n • provides expt. foundation for all our physics • d+Au Run III RHIC • provides p+Au and n+Au mixed • challenge to measure Ngrey • Ngrey => np + nn additional smearing, Craig Ogilvie

  12. 9: Degree of Strangeness Saturation: • Yield of multi-strange baryons in Au+Au 200 AGeV • If strangeness fully equilibrated => gs = 1 F. Becattini hep-ph 0202071 What is gs at RHIC? If gs larger than SPS, suggests rescattering: QGP or in hadron gas? Craig Ogilvie

  13. Cascade/pion from STAR Craig Ogilvie

  14. 8: Nice to Get Some Understanding of L/pdirect Central, Au+Au and Pb+Pb pdirect corrected for feed-down E917 Phys.Rev.Lett. 87:242301,2001 L WA97 Phys. Lett B 449, 401 (1999) p NA49 Nucl. Phys A661 383 (1999) L/pdirect ~ 1 at RHIC !! L/p ~ 0.2-0.3 pp Craig Ogilvie

  15. 7: Charmed Baryons Baryon-junction models => enhanced mid-rapidity L and p could also lead to enhanced Lc ? Lc+ => pK-p+ B.R. 5%, ct ~ 60mm combinatorial background large, vertex detector upgrades? Lc+ => Lp+ B.R. 0.009%, HIJING min-bias estimate 1 Lc per 300 events Craig Ogilvie

  16. PHENIX Au+Au 130 GeV Open symbols pp reactionsnucl-ex/0112006 6: Accurate <pt> in Near-Peripheral Collisions • Measure <pt> from pp, dA • baseline, multiple collisions • 2) Measure <pt> Au+Au Npart < 50 • 3) Si+Si to control Npart • multiple collisions ? • onset of expansion ? • pt kick from junction ? Craig Ogilvie

  17. 5: p/p vs pt measure p / p and K/ p Au+Au and baseline pp @ 200 GeV - does p / p in Au+Au continue to rise at high-pt (hydro) ? - or fall at high-pt (fragmentation models) ? PHENIX prelim Au+Au 130 GeV Craig Ogilvie

  18. Au+Au 130 AGeV PHENIX prelim 1.4 1.2 1 0.8 0.6 0.4 0.2 1 2 3 pt (GeV/c) 4: p / p at High-pt In p+p, ratio decreases, fragmentation q => p dominate g => p a) measure p / p with Au+Au, pp @ 200 GeV b) energy-loss predicts stronger decrease in p / p Wang Phys.Rev. C58 (1998) 2321 pt (GeV/c) Craig Ogilvie

  19. 3: Balance Function For Baryons given p, what is cond. probability of finding proton at Dy? and inverse questions, with a subtraction of combinatorics • Thermal + long. expansion • late hadronization • protons anti-protons tightly correlated in rapidity Craig Ogilvie

  20. 2: Rapidity Distribution of p-p Strive for p - p over broad range of rapidity - p+p, d+Au and Au+Au - discriminate between models Currently p/p available Au+Au central 130 AGeV BRAHMS Phys.Rev.Lett. 87 (2001) 112305 Craig Ogilvie

  21. 1: L-L and pdirect-pdirect Au+Au central 5% 130 AGeV HIJING/B describes both L -L and pdirect -pdirect But not L yield ( factor two underpredict, Vasile Pop Mar’02) STAR’s (L -L = 5.0  0.2  0.5) eliminates HIJING L and L yieldschallenge to models Craig Ogilvie

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