1. CBM and FRRC Mikhail Ryzhinskiy, SPbSPU (on behalf of Russian CBM branch) 1 st FRRC International Seminar

2. 2 SIS 300 → U 92+ 15-35 GeV/nucleon with beam intensities up to 10 9 /s Z/A = 0.5 nuclei up to 45 GeV/nucleon → exploration of the QCD phase diagram with heavy-ion collisions! → investigation of nuclear matter at highest baryon densities but still moderate temperatures in A+A collisions Compressed Baryonic Matter experiment

3. 3  What is the equation-of-state of strongly interacting matter? (core collapse supernovae, neutron stars, early universe)  What is the structure of strongly interacting matter as a function of T and ρ B ? (hot and dense hadronic medium, deconfined phase, phase transitions ?)  What are the in-medium properties of hadrons as a function of T and ρ B ? (partial restoration of chiral symmetry ?) Fundamental Questions of QCD compression + heating = QGP ?

4. 4 Dipol magnet JINR The Compressed Baryonic Matter Experiment Ring Imaging Cherenkov Detector IHEP, PNPI Transition Radiation Detectors JINR, PNPI Resistive Plate Chambers (TOF) INR, IHEP ECAL ITEP, IHEP Silicon Tracking Station MSU, MEPHI, JINR, IHEP, Khlopov, CKBM Tracking Detector Muon detection System PNPI

5. 5 Sergei Belogurov (ITEP) PhD – Design and Integration of the CBM experiment Mikhail Ryzhinskiy (SPbSPU) PhD – Advanced Digitization and Cluster Finding in MUCH Alexander Sadovsky (INR) PhD – Event-by-event Fluctuations at CBM Experiment Andrei Chernogorov (ITEP) – Design Justification of ECAL Olga Denisova (JINR) – Development of New Mathematical Methods for Experimental Data analysis Alexander Dermenev (INR) – Study of Projectile Spectator Detector for Centrality and Reaction Plane Determination Dmitry Golubkov (ITEP) - Optimization of CBM ECAL for χ c States Production Studies Alexander Klyuev (MEPhI) - Development or Data-driven, De-randomizing Architecture and Building Blocks for the CBM-XYTER ASIC Eugeny Kryshen (PNPI) – MUCH Design and Construction, Software Development Mikhail Prokudin (ITEP) - Development of CBM ECAL Software Georgy Sharkov (ITEP) - Comparison of ω and φ Meson Cross Sections, Measured in Different Decay Modes using CMMROOT Simulations Taras Vasiliev (JINR)- Participation in the R&D of TRD and Development of Software for Selection of Strange Particles in Nucleus- Nucleus Collisions Vladislav Zryuev (JINR)- Research and Development of Fast and High Resolution Gaseous Detectors for CBM List of candidates for FRRC grants from the Russian Institutes

6. 6 A number of polarization observables have been proposed as a possible signature of phase transition in heavy ion collisions: Decreasing of the Λ 0 transverse polarization in central collisions Global hyperon polarization in non-central events The study of the polarization effects at CBM requires good definition of the reaction plane  RP and collision centrality b. Kinematical fit using ASME method for STS(Au+Au centr. coll. 25 AGeV, via UrQMD, GEANT3 m.field) improves accuracy of the primary vertex determination spatial approx. 20 microns (P_V0, beta, tan(alpha)) : better than (1%,0.5 mrad, 0.3) Polarization in HI collisions as a new probe of the phase-transition (T.Vasiliev, Dubna group)

7. 7 Research and development of fast gaseous detectors for TRD CBM (V.Zryuev, LHEP JINR, Dubna) High granularity Spatial resolution < 300µm High rate capability high-speed detector (for the inner part of the detector planes) Main requirements for TRD detectors High radiation hardness Minimum material budget Optimal number of electronic channels The results obtained with GEM based detector Spatial resolution is ~ 90 µm for 600µm strip pitch Good linearity ~ 1% Amplification factor ~ 2 x10³. The results obtained with THGEM based detector Spatial resolution is ~ 230 μm fot 1 stage THGEM detector We are working on the technology for construction of THGEM patterns (holes and rims) with a high precision. FEE with n-Xyter chip is planning to use for further tests. R&D work show that both GEM and THGEM detectors require a lot of work to improve its reliability and stability to use them in a large system like CBM.

8. 8 Layout of the detector installation on the beam line SYS-18 GSI We have performed a systematic study of several types of gas MWPC detectors at high intensity beams at GSI. The R&D of the MWPC detectors shows practically no degradation of the signal amplitudes up to the rate of 360 kHz/cm 2. Taking into account the high spatial resolution (< 200 μm) and the operational stability of the MWPC detector as well as the results obtained on its high rate capability in our research we believe that this type of detector meets all requirements to TRD of the CBM project. The results obtained with MWPC based detector

9. φ e-e- hadronization Kinetic freeze-out φ η η  e+e+ φ K+K+ K+K+ K-K- φ ω l,fm β= 1/3 e+e-e+e- If resonance decays before in dense barionic matter  Possible rescattering of hadronic daughters  Reconstruction probability decrease for hadronic mode ω(782)  π + π - π 0,  π + π -,  π 0  (c  = 23 fm) φ(1020)  K + K -,  η ,  e + e - (c  = 44 fm)  and ω resonance decay modes (G.Sharkov, ITEP)

10. 10 Gray – MC. Black – data. Scale! Near fibers LHCb inner. 4mm Prototype. 0.5 mm 1cm Near fibers Shower library Fits exactly to the data Any incident angle checking analytical approximation quality Calorimeter simulation and  reconstruction (M.Prokudin, ITEP)

11. 11 Advanced digitization and hit finding in MUCH (M.Ryzhinskiy, SPbSPU)

12. 12 On e/  identification: comparision of TRD prototype measurements with GEANT simulation at p=1.5 GeV/c (O.Denisova, JINR) One cannot get a maximal value of pion’s suppression when using the LFR test, because the electron energy losses are described by a complex hypothesis – the sum of two distributions. Using GEANT simulations were reproduced the results obtained on the basis of real measurements, and there was demonstrated that the procedure of preparation of data sets based on real measurements is a reason of getting erroneous, overestimated results

13. Time schedule