Miyajima, 41 th ISMD, 2011/9/27Csörgő T. Intoductory review Intoductory review Bose-Einstein correlations in small systems Csörgő, Tamás MTA KFKI RMKI,

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Miyajima, 41 th ISMD, 2011/9/27Csörgő T. Intoductory review Intoductory review Bose-Einstein correlations in small systems Csörgő, Tamás MTA KFKI RMKI, Budapest, Hungary HBT story, intensity interferometry GGLP, Bose-Einstein Correlations Famous quotes vs data Functional dependence (proper variables = ?) Shape analysis (proper shape = ?) „Invisible gorillas” of Bose-Einstein correlations

Miyajima, 41 th ISMD, 2011/9/27Csörgő T. 2 GFGHKP → GGLP G. Goldhaber, W. B. Fowler, S. Goldhaber, T.F. Hoang, T. E. Kalogeropoulos, W. M. Powell, Phys. Rev. Lett. 3 (1959) 181 Searching for  meson in p+p annihilation at √s NN = 2.1 GeV in a bubble-chamber experiment observe enhancement of like-sign pion pairs in the same hemisphere, attribute it to pion correlations. „Work is in progress … involve the radius R of the interaction volume and may enable one to determine its value.” G. Goldhaber, S. Goldhaber, W-Y. Lee, A. Pais Phys. Rev. 120, 300 (1960) Explanation: Bose-Einstein statistics of pions Introduce the concept of Bose-Einstein correlations

Miyajima, 41 th ISMD, 2011/9/27Csörgő T. 3 Kopylov, Podgoretskii, Lednicky G. Goldhaber, S. Goldhaber, W-Y. Lee and A. Pais (GGLP) : explain a HBT like effect in p+p reactions at Kopylov, Podgoretskii, Dubna school Start to use correlations as a tool to measure sizes G.I. Kopylov: Like particle correlations as a tool... Phys. Lett. B 50, 474 (1974) Interference of particles emitted by moving sources G.I. Kopylov, M. I. Podgoretsky Yad.Fiz.18: (1973) Yano, Koonin, Podgoretsky (YKP) parametrization Non-identical particle interferometry: effects of fsi Sequence of particle emission in principle can be obtained R. Lednicky, Ljuboshitz Yad.Fiz.35: ,1981 Lednicky: Coined the name of Femtoscopy (nucl-th/ )

Miyajima, 41 th ISMD, 2011/9/27Csörgő T. 4 Bose-Einstein in e + e - : TASSO Fig 1. from M.Althoff et al, TASSO Collaboration, Z. Phys. C30:355 (1986) (a): like-sign correlations (b): corrected by (+-) and Monte Carlo point out an observation of a Q inv dependence approximately Gaussian phase direct relation to L3 results (W. Metzger, next talk) – a dip too!

Miyajima, 41 th ISMD, 2011/9/27Csörgő T. 5 „Monkey business” of Bose-Einstein I cannot play these videos - officially. You can privately view them at Check out at least the first two. The Invisible Gorilla: How our intuitions often deceive us by C. Chabris and D. Simons (Crown Publishers, NY, 2011) several case studies, typically outside the domain of science. are we scientists more aware ?

Miyajima, 41 th ISMD, 2011/9/27Csörgő T. 6 „Positive definitness” of Bose-Einstein Usual derivation is based on several assumtions. Check all of them experimentally. One of them fails for jet physics: smoothness approximation if not 1 + positive definit form: → look out for jets! e + e - at L3/LEP and pp at CMS/LHC data vs theory of nucl-th/

Miyajima, 41 th ISMD, 2011/9/27Csörgő T. 7 Experiments: UA1, NA22, L3, OPAL... GFGHKP: 30 in. Bubble chamber experiment, p+p, √s NN = 2.1 GeV, LRL, 2500 events, = 2638 total number of pairs EHS/NA22: Bubble chamber experiment at CERN SPS √s NN = 22 GeV, SPS 25 k   p and 29k K + p events UA1: p+p experiment at CERN SppS sqrt(s) = 630 GeV p T > 0.15 GeV/c, || < 3, 45° < ||< 135° 1.2 x 10 6 NSD events, | k| ~ 8 MeV L3, OPAL, ALEPH, DELPHI: e + e - annihilations at LEP. 2 jets and 3 + jets, √s NN = 91.2 GeV ~ 10 6 events (hadronic Z 0 decays) +...

Miyajima, 41 th ISMD, 2011/9/27Csörgő T. 8 Model independent shape analysis Advantage and/or disadvantage: – Analyse, quantify correlations model independently Only two assumptions: – The correlations are centered around some point (Q = 0) They are short-range type Long range correlations can be removed or measured independently Expansion methods to test: Is it Gaussian ? → Edgeworth expansions Is it Exponential ? → Laguerre expansions – Based on complete orthog. set of functions – T. Cs. and S. Hegyi, hep-ph/ » Not 1+ pos definite » Not connected to a source model

Miyajima, 41 th ISMD, 2011/9/27Csörgő T. 9 Published L3 results: Published L3 result: dip is significant Confirms Earlier TASSO result Is it only in e + e - ? Not! CMS found it too. For more details: See W. Metzger's and L. Peruzzi's talks

Miyajima, 41 th ISMD, 2011/9/27Csörgő T. 10 Metareview W. Kittel and E. de Wolf, Soft Multihadron Dynamics, World Scientific (2005) 652 p B. Lörstad, Int.J.Mod.Phys.A4:2861, 1989 W. A. Zajc, NATO Adv.Study Inst.Ser.B Phys.303: ,1993 M. Lisa, S. Pratt,, R. Soltz, U. A. Wiedemann Ann.Rev.Nucl.Part.Sci.55: ,2005 T. Cs. hep-ph/ J.Phys.Conf.Ser.50:259, 2006 R. M. Weiner Phys.Rept.327: ,2000 U. Heinz and U. A. Wiedemann Phys.Rept.319: ,1999 W. Kittel, AIP Conf.Proc.828: ,2006 – beyond Gaussian W. Kittel, Hep-ph/ – a critical (p)review M. G. Bowler: Are the observed Bose-Einstein correlations possible? Marburg LESIP IV 1990:2-15 (QCD161:I972:1990)