1 / 33

Pion femtoscopy from ALICE

XI GDRE WORKSHOP Heavy Ions at Relativistic Energies SUBATECH, Nantes, France June 29 - July 13, 2011. Pion femtoscopy from ALICE. Jan Pluta Faculty of Physics Warsaw University of Technology. ALICE-femto one year ago? (some results presented during the last GDRE workshop, July 2010).

wynn
Download Presentation

Pion femtoscopy from ALICE

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. XI GDRE WORKSHOP Heavy Ions at Relativistic Energies SUBATECH, Nantes, France June 29 - July 13, 2011 Pion femtoscopy from ALICE Jan Pluta Faculty of Physics Warsaw University of Technology

  2. ALICE-femto one year ago?(some results presented during the last GDRE workshop, July 2010)

  3. Pion source size from STAR STAR, arXiv:1004.0925 [nucl-ex] STAR, Phys. Rev. C 80 (2009) 24905 p + p (various ways of fitting) Au + Au Cu + Cu pT dependence of pion source size similar in nuclear and pp collisions DariuszMiskowiec, Particle correlations in ALICE, Physics at the LHC, Hamburg, 10-Jun-2010

  4. Identical pion correlation functions Bose-Einstein peak clearly visible DariuszMiskowiec, Particle correlations in ALICE, Physics at the LHC, Hamburg, 10-Jun-2010 4 4

  5. Multiplicity and transverse momentum dependence identical pions unlike-sign pions baseline has to be treated properly DariuszMiskowiec, Particle correlations in ALICE, Physics at the LHC, Hamburg, 10-Jun-2010

  6. Multiplicity dependence for comp.: nuclear collisions M. Lisa, Ann. Rev. Nucl. Part. Sci. 55, 357 visible dependence in pp  HBT radii depend on multiplicity rather than on collision geometry DariuszMiskowiec, Particle correlations in ALICE, Physics at the LHC, Hamburg, 10-Jun-2010

  7. Transverse momentum dependence no significant dependence on transverse momentum for comparison: in nuclear collisions DariuszMiskowiec, Particle correlations in ALICE, Physics at the LHC, Hamburg, 10-Jun-2010

  8. 7 TeV and new 900 GeV data identical pion correlations 120 M events at 7 TeV 2.1 M events at 0.9 TeV high-q baseline flatter at 7 TeV DariuszMiskowiec, Particle correlations in ALICE, Physics at the LHC, Hamburg, 10-Jun-2010

  9. π+π-correlations at 7 TeV Coulomb K0S rich resonance structure ω ρ f0 f2 low-q baseline steeper at 7 TeV  origin: jets high-q baseline flatter at 7 TeV  origin: momentum cons. DariuszMiskowiec, Particle correlations in ALICE, Physics at the LHC, Hamburg, 10-Jun-2010

  10. one year after … ALICE – femto papers Two-pion Bose-Einstein correlations in pp collisions at sqrt(s)=900 GeV.By ALICE Collaboration (K. Aamodt et al.). Jul 2010. 13pp. Temporary entryPublished in Phys.Rev.D82:052001,2010. e-Print: arXiv:1007.0516 [hep-th] Femtoscopy of pp collisions at sqrt{s}=0.9 and 7 TeV at the LHC with two-pion Bose-Einstein correlations. By ALICE Collaboration (K. Aamodt et al.) CERN-PH-EP-2010-083, Jan 2011. 21pp. e-Print: arXiv:1101.3665 [hep-ex] Two-pion Bose-Einstein correlations in central Pb-Pb collisions at $sqrt(s_NN)$ = 2.76 TeV.By ALICE Collaboration (K. Aamodt et al.). CERN-PH-EP-ALICE-2010-006, Jan 2011. 18pp. Published in Phys.Lett.B696:328-337,2011. e-Print: arXiv:1012.4035 [nucl-ex]

  11. Quark Matter’ 2011 - presentations

  12. Examples of correlation functions …in spherical harmonics …in Cartesian coordinates Multiplicity dependence

  13. Momentum - dependence

  14. The energy (in)dependence of the emission region size The change of energy almost one order of magnitude !!!

  15. The non-femtoscopic background MC -simulations

  16. Non-identical pions π+π- pairs

  17. Fitting the correlation function Bowler-Sinyukov formula Final functional form B-background fit

  18. Conclusions • Linear scaling wit dN/dɳ seen for all energies • kT dependence consistent with hydro • No common scaling for pp and AA • No collision energy dependence of femtoscopic radii for pp collisions • Radii in Pb-Pb collisions at LHC 30% larger than in AuAu collisions at RHIC • Problem with non-femtoscopic correlations

More Related