First femtoscopy results at LHC

1. Lessons from heavy ion collisions at RHIC

Pion Interferometry in Au+Au and Cu+Cu Collisions at RHIC; sqrt (s_NN)=64.2 and 200 GeV
By STAR Collaboration (B.I. Abelev et al.). Mar 2009. 12pp.
Published in Phys.Rev.C80:024905,2009.
e-Print: arXiv:0903.1296 [nucl-ex]

Correlation functions

Results: CMS energy, m_t, and centrality dependence, I

Results: m_t, and centrality dependence, II

Results: freeze-out volume and mean free pat

Results: particle multiplicity dependence

RHIC conlusions (I.)

1. femtoscopic radii increases  with collision centrality

2. femtoscopic radii decreases with m_t (expansion)

3. Freeze-out wolume show linear dependence on particle multiplicity

3a Universal mean free path length at freeze-out

Pion femtoscopy in p+p collisions at sqrt(s)=200 GeV arXiv:1004.0925v2 10 Apr. 2010   RHIC Conclusion (II.): very similar mt and multiplicity scaling in p+p and A+A collisions

LHC

Basic definitions

Parameters

Statistics

Coulomb correction

Two examples

Double ratio

Results

Correlation functions

Exponential and Gaussian fitting

Exponential fits for two energies

Values and errors

Correlation functions for different charged-particle multiplicity

Charged-particle multiplicity dependence

Charged-particle multiplicity dependence

Fi rFirst results on particle correlations from ALICE   Dariusz Miskowiec, Particle correlations in ALICE, Physics at the LHC, Hamburg, 10-Jun-2010

Proton-proton correlations, by Piotr Ostrowski