1. J. Stefan Institute, Ljubljana http://www-f9.ijs.si Institute: Multidisciplinary institute, largest research institution in Slovenia Physics (solid state, particle physics, nuclear physics, theory, surface science, reactor physics) Chemistry Biochemistry Electronics, electrotechnics Staff: about 1000 Main facilities: TRIGA MarkIII reactor Tandem 2 MeV Peter Križan, UL+JSI

2. JSI: interdisciplinary research is easy – next door lab might have a solution for your troubles Example: High power pulsed laser in the solid state department (80fs pulse width, 10J/pulse)  excellent for Single Event Upset (EPS) tests of read-out electronics for Belle SVD

3. Experiments: ATLAS, Belle, AUGER Past: HERA-B, CPLEAR, DELPHI Staff: Researchers: ~20 (including part time professors of the Universities of Ljubljana and Maribor) PhD students: ~10 Particle physics department (F9)

4. Physics Panel, 17/06/2008 4 Research Programme – Snapshot R&D projects Cryogenic detectors (CERN RD-39) Diamond detectors (RD-42) Radiation hard detectors (RD-50) ATLAS experiment at LHC in CERN ~2000 researchers, 167 institutions Belle experiment at KEK-B in KEK ~380 researchers, 55 institutions EU projects  Grid computing (EGEE-I, II, III)  Medical imaging detectors (MADEIRA)  MC training on particle detectors (MCPAD)  RADFET dosimetry (RADOS)

5. Physics Panel, 17/06/2008 Experimental Paricle Physics5 Decays to CP eigenstates difference of effective lifetimes measured in decays to CP (D 0 → K + K -,  +  - ) and non-CP states (D 0 → K -  + ) precise  measurement  first evidence of mixing (30 years after D 0 discovery) + Belle, Phys. Rev. Lett. 98, 211803 (2007) ratio (K + K - +  +  - ) vs. K -  + y: one of parameters determining the rate of mixing Highlights - D 0 Meson Mixing

6. Expertise (in experimental methodology) RICH detectors: DELPHI, HERA-B, Belle upgrade Si strip detectors: DELPHI, RD20, ATLAS, Belle Diamond sensors: ATLAS BCM, Belle radiation monitoring readout/ trigger electronics: HERA-B (RICH, tracker), Belle (SVD, PID upgrade) Grid computing: CrossGrid (EU project), BalticGrid (EU project), WLCG Monte Carlo simulations (detector modelling, physics simulations) Lecturing at the University of Ljubljana (undergraduate and postgraduate courses): particle physics, detector techniques, analysis methods; supervising diploma, MSc and PhD theses.

7. 7 JSI@ATLAS ATLAS –Members since 1996 –SemiConductor Tracker Radiation hardness studies and QA (at the reactor center) Low-mass tapes and thermal enclosure heaters –Beam Conditions Monitor –Radiation monitors –Physics analysis and MC software –Grid computing – TIER-2 centre

8. 8 Into the Future – R&D for sLHC sLHC = LHC x 10 in luminosity –Severe radiation damage to tracker –Current tracker needs to be replaced –All-Si tracker envisaged –Si (short) strips at outer radii –Pixels inside Active in two ATLAS R&D projects –Diamond pixels –n + p strips –Recent striking result  Collected charge from n + p strips independent of fluence if sufficiently high bias applied

9. HERA-B RICH 100 m 3 of C 4 F 10 ~1 ton of gas

10. HERA-B RICH  Little noise, ~30 photons per ring Typical event  Worked very well! Kaon efficiency and pion, proton fake probability KKKK pKpK KK

11. Belle PID upgrade R+D Two new particle ID devices, both RICHes: Barrel: TOP – a special kind of DIRC Endcap: proximity focusing RICH

12.  stack two tiles with different refractive indices: “focusing” configuration How to increase the number of photons without degrading the resolution? normal Radiator with multiple refractive indices  n 1 < n 2  focusing radiator  n 1 = n 2

13. 4cm aerogel single index 2+2cm aerogel Focusing configuration – data  NIM A548 (2005) 383

14. JSI is looking forward to the collaboration within the MC-PAD project

15. Physics Panel, 17/06/2008 Experimental Paricle Physics15 Highlights - Direct CP Violation Belle, Nature 452, 332 (2008) Difference between B and B decays CP violation known; magnitude too small to describe matter domination in universe within SM A K+  - ≈ A K+  0 ~ one out of 10 5 B mesons decays to this final states difficult to explain within SM (especially in combination with other meas.); hint for yet unknown sources of CP violation?