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Grigory Nigmatkulov National Research Nuclear University MEPhI

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1 Grigory Nigmatkulov National Research Nuclear University MEPhI
Femtoscopic correlations of pions and kaons measured in the BES program at STAR (and not only at STAR) Grigory Nigmatkulov National Research Nuclear University MEPhI Study of high-density nuclear matter with hadron beams Weizmann Institute of Science March 28-31, 2017

2 Weizmann Institute of Science Grigory Nigmatkulov
Motivations Allows to study space-time structure of the produced collective system of self-interacting matter (also see T. Csörgő talk) Very important in HI collisions: Constraining Equation of State S. Pratt et al. PRL 114 (2015) Constraining hydro/transport M.A. Lisa et al. Ann. Rev. Nucl. Part. Sci. 55 (2005) 357 Sensitivity to the phase transition D.H. Rischke, M. Gyulassy. NPA 608 (1996) 479 Weizmann Institute of Science Grigory Nigmatkulov

3 Pion femtoscopy from STAR
Precise measurement in a broad energy range (from 7.7 to 200 GeV) using the same detector, techniques, etc. STAR, PRC 92 (2015) Centrality and transverse mass dependencies Consistency of the results from fixed target and collider experiments in a wide energy range Weizmann Institute of Science Grigory Nigmatkulov

4 Importance of the collision energy scans
Radial flow & emission duration Space and time scale as ~multiplicity1/3 The created system lives longer, however no sudden jumps in timescales in RL Radial flow Longitudinal flow ~ evolution time STAR, PRC 92 (2015) Weizmann Institute of Science Grigory Nigmatkulov

5 Importance of the Beam Energy Scan
Finite-size scaling: At critical point, susceptibilities diverge for infinite system → delta function For finite system: No divergence Peaking at CP and shift of the peak position Broadened peaks STAR, PRC 92 (2015) R. Lacey. PRL 114 (2015) Weizmann Institute of Science Grigory Nigmatkulov

6 Different particle species
PHENIX, PRL 103 (2009) STAR, PRC 88 (2013) Provide additional information Check for mT dependence → determine freeze-out conditions Model constrains: should work for heavier particles Possibility to distinguish between different model scenarios Malinina (QM’15) NPA 956 (2016) 373 Weizmann Institute of Science Grigory Nigmatkulov

7 Kaon femtoscopy at RHIC
mT-scaling breaks for individual radii Longer emission duration of kaons than of pions Models cannot describe the differences in the outward direction well STAR also observes the mT-scaling breaking PHENIX, PRC 92 (2015) J. Lidrych (for the STAR collab.) QM 2017 Weizmann Institute of Science Grigory Nigmatkulov

8 Kaon femtoscopy at RHIC
J. Lidrych (for the STAR collab.) QM’17 Energy dependence of kaon source radii is similar to pions Comparison of K+ and K- radii (should be the same for high-energy collisions) What about low energies? K+N cross-section is smaller than K-N. J. Lidrych (for the STAR collab.) QM 2017 Weizmann Institute of Science Grigory Nigmatkulov

9 Weizmann Institute of Science Grigory Nigmatkulov
Summary Pion femtoscopy is a precise tool: Femtoscopic radii are consistent for collider and fixed target experiments System lives longer at high collision energies Interesting behavior from Beam Energy Scan program Kaon femtoscopy Additional constrains on the models Breaking of the mT-scaling for individual directions No differences between positive and negative kaon emission region for low energies Weizmann Institute of Science Grigory Nigmatkulov

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