Pion femtoscopy from ALICE

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Presentation transcript:

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

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

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

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

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 Dariusz Miskowiec, Particle correlations in ALICE, Physics at the LHC, Hamburg, 10-Jun-2010

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

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

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. Dariusz Miskowiec, Particle correlations in ALICE, Physics at the LHC, Hamburg, 10-Jun-2010

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 entry Published 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]

Quark Matter’ 2011 - presentations

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

Momentum - dependence

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

The non-femtoscopic background MC -simulations

Non-identical pions π+π - pairs

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

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