1 / 25

RHIC HBT in a larger context

RHIC HBT in a larger context. Zbigniew Chaj ę cki, OSU for the Experiment. Outline. HBT in Heavy-Ion Collisions at RHIC Multiplicity as universal scaling R(m T ) - direct probe of flow scenario Femtoscopy in p+p [reminder]

afra
Download Presentation

RHIC HBT in a larger context

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. RHIC HBT in a larger context Zbigniew Chajęcki, OSUfor the Experiment Z. Ch. - WPCF 2008, Krakow, Poland, Sep. 11-14 2008

  2. Outline • HBT in Heavy-Ion Collisions at RHIC • Multiplicity as universal scaling • R(mT) - direct probe of flow scenario • Femtoscopy in p+p [reminder] • mT scaling of HBT radii (AA/pp) [reminder] • Energy and Momentum Conservation Induced Correlations in p+p • STAR results from p+p (all fits) • world systematics : Rinv(N,mT), Ro,s,l(mT) • How different is pp from AA at the end? Z. Ch. - WPCF 2008, Krakow, Poland, Sep. 11-14 2008

  3. Heavy ions at RHIC Multidimensional analysis at RHICR(√SNN, mT, b, Npart, A, B, PID) ... but is there a scaling variable? Z. Ch. - WPCF 2008, Krakow, Poland, Sep. 11-14 2008

  4. Multiplicity scaling of HBT radii at RHIC Radii scale with multiplicity Lisa, Pratt, Soltz, Wiedemann, Ann.Rev.Nucl.Part.Sci. 55 (2005) 357-402 Z. Ch. - WPCF 2008, Krakow, Poland, Sep. 11-14 2008

  5. mT dependence of pion HBT radii Au+Au@19.6GeV 0-10% centrality • Flow is the most important bulk feature at RHIC • mT-dependence of femtoscopy probes flow the most directly • quantitative agreement w/p-only observables Z. Ch. - WPCF 2008, Krakow, Poland, Sep. 11-14 2008

  6. Femtoscopy - direct evidence of flow Spectra v2 R (fm) space-momentum substructure mapped in detail STAR PRL 91 262301 (2003) HBT mT (GeV/c)  K Flow-dominated “Blast-wave” toy models capture main characteristics e.g. PRC70 044907 (2004) Z. Ch. - WPCF 2008, Krakow, Poland, Sep. 11-14 2008 6

  7. Id-pion correlations in p+p STAR preliminary mT [GeV/c2] mT [GeV/c2] • p+p and A+A measured in thesame experiment • great opportunity to compare physics • what causes pT-dependence in p+p? • same cause as in A+A? Z. Ch. - WPCF 2008, Krakow, Poland, Sep. 11-14 2008

  8. Femtoscopy in pp vs heavy ions Ratio of (AuAu, CuCu, dAu) HBT radii by pp HBT radii scale with pp Scary coincidence or something deeper? pp, dAu, CuCu - STAR preliminary Z. Ch. - WPCF 2008, Krakow, Poland, Sep. 11-14 2008

  9. Non-femto correlations / SH representation d+Au: peripheral collisions STAR preliminary Z.Ch., Gutierrez, Lisa, Lopez-Noriega, [nucl-ex/0505009] Pratt, Danielewicz [nucl-th/0501003] STAR preliminary Z. Ch. - WPCF 2008, Krakow, Poland, Sep. 11-14 2008

  10. Decomposition of CF onto Spherical Harmonics Au+Au: central collisions C(Qout) C(Qside) C(Qlong) Z.Ch., Gutierrez, Lisa, Lopez-Noriega, [nucl-ex/0505009] Pratt, Danielewicz [nucl-th/0501003] Qx<0.03 GeV/c Z. Ch. - WPCF 2008, Krakow, Poland, Sep. 11-14 2008

  11. Non-femtoscopic correlations in STAR N-dep. of non-femtoscopic correlations in p+p STAR preliminary Baseline problem is increasing with decreasing multiplicity STAR preliminary Z. Ch. - WPCF 2008, Krakow, Poland, Sep. 11-14 2008

  12. EMCICs in other experiments Multiplicity increases Qx<0.2 GeV/c E766, PRD 49 (1994) 4373 OPAL, Eur. Phys. J. C52 (2007) 787-803 Qx<0.04 GeV/c NA23, Z. Phys. C43 (1989) 341 CLEO PRD32 (1985) 2294 NA22, Z. Phys. C71 (1996) 405 Z. Ch. - WPCF 2008, Krakow, Poland, Sep. 11-14 2008

  13. Common approaches to „remove” non-femtoscopic correlations b |Q| |Q| z |Q| • MC simulations • ‘ad-hoc’ parameterizations • OPAL, NA22, … • “zeta-beta” fit by STAR [parameterization of non-femtoscopic correlations in Alm’s] • An alternative explanation:Energy and Momentum Conservation Induced Correlations, Z.Ch. and Mike Lisa [ArXiv:0803.022, sub. to PRC] Z. Ch. - WPCF 2008, Krakow, Poland, Sep. 11-14 2008

  14. How do EMCICs look? GenBod calculations Z. Ch. - WPCF 2008, Krakow, Poland, Sep. 11-14 2008 mike lisa - Nuclear Physics & RIKEN Theory Seminar 8 Aug 2008 14

  15. EMCIC fit to STAR p+p data λ = 0.38 ± 0.01 Ro = 0.65 ± 0.01 fm Rs = 0.85 ± 0.02 fm Rl = 1.42 ± 0.02 fm λ = 0.69 ± 0.01 Ro = 0.98 ± 0.03 fm Rs = 0.94 ± 0.02 fm Rl = 1.46 ± 0.03 fm N = 15 <E> = 0.39 GeV <E2> = 0.19 GeV2 <pT2> = 0.5 GeV2 <pz2> = 0.25 GeV2 STAR preliminary standard fit 15 15 Z. Ch. - WPCF 2008, Krakow, Poland, Sep. 11-14 2008

  16. EMCIC fit to STAR p+p data λ = 0.38 ± 0.01 Ro = 0.65 ± 0.01 fm Rs = 0.85 ± 0.02 fm Rl = 1.42 ± 0.02 fm λ = 0.69 ± 0.01 Ro = 0.96 ± 0.04 fm Rs = 0.98 ± 0.03 fm Rl = 1.26 ± 0.02 fm N = 10.3 <E> = 0.61 GeV <E2> = 0.43 GeV2 <pT2> = 0.2 GeV2 <pz2> = 0.4 GeV2 STAR preliminary 16 Z. Ch. - WPCF 2008, Krakow, Poland, Sep. 11-14 2008

  17. Various fits to STAR p+p data STAR preliminary STAR preliminary Z. Ch. - WPCF 2008, Krakow, Poland, Sep. 11-14 2008

  18. mT scaling of HBT radii STAR preliminary Various fits give different radii but mT scaling of HBT radii is preserved in all fits p+p HBT looks like flow! Z. Ch. - WPCF 2008, Krakow, Poland, Sep. 11-14 2008

  19. Multiplicity dependence in p+p STAR preliminary 200 GeV Rinv [fm] Z. Ch. - WPCF 2008, Krakow, Poland, Sep. 11-14 2008

  20. p+p vs heavy ions - R(N,mT) STAR preliminary Similar mT and multiplicity dependence of HBT radii in p+p and heavy ions in STAR Is STAR p+p unique? Let’s look at world’s results on HBT in elementary particle collisions … Z. Ch. - WPCF 2008, Krakow, Poland, Sep. 11-14 2008

  21. Femtoscopy in small systems R ≈ 0.5 - 1.5 fm Z. Ch. - WPCF 2008, Krakow, Poland, Sep. 11-14 2008

  22. My first impression Can we do a direct comparison between experiments? Z. Ch. - WPCF 2008, Krakow, Poland, Sep. 11-14 2008

  23. Parameterizations of 1D CF used in comparision b/w experiments RB≈2·RG Z. Ch. - WPCF 2008, Krakow, Poland, Sep. 11-14 2008

  24. Femtoscopy similar in p+p as in Au+Au @ STAR “World results” show both pT and N dependence! EMCICs seen in small systems differences observed in pT spectra consistent with EMCIC “distortion” of unchanging parent distribution (soft sector) - talk by Mike Lisa & arXiv:0807.3569 Same physics in p+p as in Au+Au and the only difference due to phase-space effects? possibilities: spectra and HBT are insensitive to underlying physics (flow etc) they are sensitive & the very different physics of A+A and p+p look coincidentally identical they are sensitive, and driving physics is the same Summary Z. Ch. - WPCF 2008, Krakow, Poland, Sep. 11-14 2008 24

  25. www.femtoscopy.org Database of talks/proceedings on particle correlations and related topics Femtoscopy.org in numbers Meetings : 24 records Speakers : 117 records Talks : 248 records Files : 295 records Z. Ch. - WPCF 2008, Krakow, Poland, Sep. 11-14 2008 25

More Related