Lisa - Quark Matter 991 Beam Energy Evolution of HBT Sytematics at the AGS Mike Lisa, The Ohio State University for the E895 Collaboration N.N. Ajitanand,

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Presentation transcript:

Lisa - Quark Matter 991 Beam Energy Evolution of HBT Sytematics at the AGS Mike Lisa, The Ohio State University for the E895 Collaboration N.N. Ajitanand, J. Alexander, D. Best, P. Brady, T. Case, B. Caskey, D. Cebra, J. Chance, I. Chemakin, P. Chung, V. Cianciolo, B. Cole, K. Crowe, A. Das, J. Draper, S. Gushue, M. Gilkes, M. Heffner, H. Hiejima, A. Hirsch, E. Hjort, L. Huo, M. Justice, M. Kaplan, J. Klay, D. Keane, J. Kintner, D. Krofcheck, R. Lacey, J. Lauret, E. LeBras, M. Lisa, H. Liu, Y. Liu, B. McGrath, Z. Milosevich, D. Olson, S. Panitkin, C. Pinkenburg N. Porile, G. Rai, H.-G. Ritter, J. Romero, R. Scharenberg, L. Schroeder, R. Sotlz, B. Srivastava, N. Stone, J. Symons, S. Wang, R. Wells, J. Whitfield,T. Wienold, R. Witt, L. Wood, X. Yang, Y. Zhang, W. Zhang Auckland - BNL - CMU - Columbia - UC Davis - Harbin - KSU - LBL - LLNL - St. Mary’s College - OSU - Purdue - Stony Brook Motivation and Measurement Correlation Systematics at Intermediate AGS energy E beam Centrality y m T  rp Summary

2Lisa - Quark Matter 99 HBT Excitation Function at AGS - Motivation Characterize  source geometry and dynamics as function of E beam, m T, y,  rp Watch for “anomalous” lifetimes/sizes Test dynamical models that provide “hadronic baseline” - can they extrapolate to RHIC? “”“” with transition cc 3D hydro model Rischke & Gyulassy NPA 608, 479 (1996) E observable AGSSPSRHIC Signatures of new physics may be subtle E observable AGSSPSRHIC

3Lisa - Quark Matter 99 Measurement with the EOS TPC Up to ~350 particles/event (60  - ) measured over large phase space Good reaction plane resolution  p/p  3% (dominated by MCS)  5% e - contamination in  - Posters by D. Cebra & C. Pinkenburg Talk by G. Rai in Thurs. plenary session

4Lisa - Quark Matter 99 The E895  - HBT Analysis Iterative correction for  p (typical increase in fit parameters by ~ 8%) 2-track cut eliminates track merging limits analysis to low p T (< 0.4 GeV/c) Full Coulomb-wave (  = 5 fm) Coulomb correction employed Analyze in frame fixed at y cm Event-mixing with  rp  selection: mix only events with “same”  rp Statistical uncertainties shown. Systematic errors of same order. Passage of a track “kills” an area ~ (1 cm) 2 on padrow  merging 128 padrows beam

5Lisa - Quark Matter 99 1-D Correlation Function Excitation Function at y cm Smooth evolution of 1-D fit parameters with E

6Lisa - Quark Matter 99 Bertsch-Pratt projections (11%  T y cm  0.35 p T = MeV/c)

7Lisa - Quark Matter 99 Evolution of the BP and YKP fit parameters Increased production of long- lived  - -emitters  fall in Strong evolution of R s (R  ) with beam energy Hadronic model with or without meanfield underpredicts (apparent) geometric size at low beam energy

8Lisa - Quark Matter 99 Evolution of (apparent) Shape: Oblate to Prolate Transition from oblate to prolate shape at AGS connects Bevalac observations to SPS Transition in character of flow/expansion: transverse  longitudinal?

9Lisa - Quark Matter 99 m T dependence at y cm for 2 AGeV central collisions Dynamics (timescale/flow)  radii drop with m T  - from decays at low m T   increases with m T x (fm) y (fm)

10Lisa - Quark Matter 99 m T dependence at y cm for 6 AGeV central collisions At higher beam energy, R S falls more steeply

11Lisa - Quark Matter 99 Evolution of m T dependence (y=y cm  0.5) magnitude of R O (m T ) falls with E beam. Decline of R S with E beam driven primarily by increased falloff with m T at high energy. R L (m T ) roughly constant as function of E beam

12Lisa - Quark Matter 99 Evolution of systematics - data and model Observed evolution of systematics not reproduced by model Dynamics driving R S (m T ) may not depend on collision energy within RQMD

13Lisa - Quark Matter 99 Testing the model at the SPS For  -... Model under predicts apparent size below 10 AGeV... over predicts size at 158 AGeV Extrapolation to RHIC??? NA44 RQMD R out 4.88   0.14 R side 4.45   0.20 R long 6.03   0.21 I.G. Bearden et al (NA44) PRC58, 1656 (1998) D. Hardtke, Ph.D. thesis (1997)

14Lisa - Quark Matter 99 Rapidity dependence Rather flat dependence of fit parameters near y cm Near beam rapidity (0.9, 1.4), radii begin to fall off when analyzed in Au+Au c.m. frame

15Lisa - Quark Matter 99 Longitudinal flow from cross-term and y so : Rapidity dependence of Bertsch-Pratt R ol 2 and Yano-Koonin y so sensitive to longitudinal flow 2 AGeV: little longitudinal flow 8 AGeV: non-boost-invariant flow

16Lisa - Quark Matter 99 Centrality Dependence of the Correlations suppressed for central collisions due to increased production of ,  Gentle fall of sideward radii as size of overlap region falls b=2  7 fm: ~ 35% reduction in RMS

17Lisa - Quark Matter 99 Viewing the pion source in its natural frame b  0 collisions  anisotropy in momentum space (elliptic flow) Also visible in coordinate space? P. Danielewicz et al, PRL 81, 2438 (1998) Also see E895 elliptic flow poster toy example

18Lisa - Quark Matter 99 HBT with respect to the Reaction Plane - data b  fm Small but significant oscillation observed in sideward radius Consistent with naïve geometrical view, and RQMD Reduced strength of oscillation in R out may give information on lifetime or effective opaqueness Uncorrected for r.p. resolution cuts not identical

19Lisa - Quark Matter 99 Evolution of AGS - Summary E895 has measured systematics of  - interferometry at 2-8 AGeV  no anomalous behaviour suggestive of QGP formation  apparent sideward radius (and ) fall with E  m T -dependence of R S weak at low E beam : less flow?  evolution from oblate (Bevalac-like) toward prolate (SPS-like) source  y-dependence of R ol 2, y so YKP  little longitudinal flow at 2 AGeV  gentle centrality dependence - no surprises The Next Frontier - Imaging the source in its natural frame  ~0.5 fm oscillation of R S observed at low E beam - less at higher energy  detailed study of source in natural frame may give info on opacity/lifetime

20Lisa - Quark Matter 99 Evolution of AGS - Summary II Excitation Function - powerful tool to test/tune understanding of “normal” physics in R.H.I.C. RQMD does not reproduce evolution in detail  underpredicts transverse size below ~10 AGeV - overpredicts size above  incorrect evolution of x - p correlation?  correct outward radius an artifact of effective emission timescale?  little (relevant) evolution of dynamics in AGS range Plans  detailed analysis of HBT(  rp ) (including dispersion corrections)   - phasespace density as a function of p

21Lisa - Quark Matter 99 HBT with respect to the Reaction Plane - RQMD (perfect r.p. resolution) oscillation -  elliptical flow? R out oscillates against R side, with similar magnitude Oscillation strength roughly constant with E beam R long : ?

22Lisa - Quark Matter 99 Bertsch-Pratt projections - data and RQMD (11%  T y cm  0.35 p T = MeV/c)

23Lisa - Quark Matter 99 Typical 1-  Error contours for BP fits Primary correlation is the familiar correlation between and radii Large acceptance  no strong correlations between radii Cross-term uncorrelated with any other parameter

24Lisa - Quark Matter 99  - Acceptance