1. ECFA Meeting-AthensTh. D. Papadopoulou1 On behalf of the Hellenic groups NTU Athens/H 1 – Univ. of Aegean/ZEUS Theodora D. Papadopoulou ECFA Meeting - Athens, October 10, 2008

2. ECFA Meeting-AthensTh. D. Papadopoulou2 Outline  Hellenic groups at HERA  People and Activities  Research Activities / Publications  Research Budget  Data Analysis Results  Future Plans  As an Epilogue

3. ECFA Meeting-AthensTh. D. Papadopoulou3 Greek groups at HERA Group : University of Aegean - Chios Members : Ioannis Gkialas Kostas Papageorgiou, Post Doc Group : National Technical University - Athens Members : Theodora Papadopoulou Ilias Panagoulias, PhD student About 2 – 3 Greek summer students/year

4. ECFA Meeting-AthensTh. D. Papadopoulou4 Research Activities/Publications Group : University of Aegean - Chios Activities : Data Analysis on F L measurement Z-vertex determination Data taking run shifts Publications : 1 DAAD report, 1 Conf. paper & 1 publication under preparation Group : National Technical University - Athens Activities : Data Analysis on Leptoquark search Data Analysis on LFV Validation on new software releases Data taking run shifts Publications : 2 Conference papers & 2 publications under preparation

5. ECFA Meeting-AthensTh. D. Papadopoulou5 Research budget Group : University of Aegean - Chios Research Budget : from HERA : ? from Aegean Un. : ? from EU + Greek projects: ? Group : National Technical University - Athens Research Budget : from HERA : ~ 20,000 Euro for 2 years (2005 & 2008) from EU + Greek projects: ~ 40,000 Euro for 2 years ( PYTHAGORAS II: (2006-07)  During 2008 : 0 Euro !

6. ECFA Meeting-AthensTh. D. Papadopoulou6 Remarks on Research budget Group : National Technical University - Athens Research Budget : from HERA : ~ 20,000 Euro for 2 years (2005 & 2008) from EU + Greek projects: ~ 40,000 Euro for 2 years(2006-07) ( PYTHAGORAS II)  During the year 2008 : 0 Euro ! Remark : financial support CERN vrs DESY for hardware or for Physics projects on year 2008 : CERN : 0 financial support to our group ! DESY : 7 person-months financial support to our group

7. ECFA Meeting-AthensTh. D. Papadopoulou7

8. ECFA Meeting-AthensTh. D. Papadopoulou8 HERA I / HERA II World’s unique e p Accelerator and Collider Operated 1992 -2007 H1 & ZEUS each one have collected 0.5 fb־¹ of high quality Physics data balanced in e± 72 % of the Luminosity is from HERA II longitudinally polarized e± beams Polarization typically 30 – 40 %

9. ECFA Meeting-AthensTh. D. Papadopoulou9 “F L and Z-vertex measurements at HERA” K. Papageorgiou, I. Gkialas University of the Aegean

10. ECFA Meeting-AthensTh. D. Papadopoulou10 Width of distribution is due to proton bunch width, σ=110mm Some fraction of the recorded interactions are:  Electron in the nominal bunch interacting with a proton in a satellite bunch (+/- 72cm)  Proton in the nominal bunch interacting with a electron in a satellite bunch (+/- 30cm) FITTING THE Z-VERTEX DISTRIBUTION : Physical Justification

11. ECFA Meeting-AthensTh. D. Papadopoulou11 LER DATA LER MC Nominal: Zvtx ~ 0.43 cm e- Satellite : ~2.1 %, p- Satellite : ~4 % Fit with 5 Gaussians { nominal + e-satellite (+/- ~30cm) + p-satellite (+/-70cm) } FIT OF THE RECONSTRUCTED LER DATA AND MC Z- VERTEX

12. ECFA Meeting-AthensTh. D. Papadopoulou12 MER DATA MER MC Fit with 5 Gaussians {nominal + e-satellite (+/- ~30cm) + p-satellite (+/-70cm) } FIT OF THE RECONSTRUCTED MER DATA AND MC Z- VERTEX

13. ECFA Meeting-AthensTh. D. Papadopoulou13 ME R LER Apply to MC  Input: True Zvtx of MC  Output: weight The routine is made such that normalization is kept between [-100,100] cm RE-WEIGHTING ROUTINE

14. ECFA Meeting-AthensTh. D. Papadopoulou14 F L MEASUREMENT : Motivation & Method F L -- longitudinal SF, sizeable only at high y, observable at low x -- F L =0 in QPM (spin ½ partons – Gallan-Gross), -- proportional to gluon at higher orders, Direct sensitivity to gluon dynamics To separate F 2, F L w/o theory assumption, one needs to measure the cross section at fixed (x,Q 2 ) and different values of y  different beam energies (s) :reduced cross section

15. ECFA Meeting-AthensTh. D. Papadopoulou15  Low-x: visible differences between data sets  High-x: cross sections are consistent  Low-x: the x sections turn over Reduced cross section measurement (ZEUS)

16. ECFA Meeting-AthensTh. D. Papadopoulou16  Results are consistent with F L from ZEUS JETS PDF’s F L measurement (ZEUS)

17. ECFA Meeting-AthensTh. D. Papadopoulou17 “ Leptoquark searches and LFV ” I. Panagoulias, Th. Papadopoulou National Technical University of Athens

18. ECFA Meeting-AthensTh. D. Papadopoulou18 Leptoquarks at HERA ep is the golden machine to study LQs SEARCH FOR 1 rst GENERATION LQs BRW Model

19. ECFA Meeting-AthensTh. D. Papadopoulou19 Search for first generation LQs at HERA From I.Panagoulias talk at DIS08 (London)

20. ECFA Meeting-AthensTh. D. Papadopoulou20 Search for first generation LQs at HERA

21. ECFA Meeting-AthensTh. D. Papadopoulou21 LQ limits in the BRW model

22. ECFA Meeting-AthensTh. D. Papadopoulou22 Comparison with LEP & Tevatron

23. ECFA Meeting-AthensTh. D. Papadopoulou23 Search for Lepton Flavor Violation LQs Calculation of Limits is not finished for the 2 nd and 3 rd generation LQs

24. ECFA Meeting-AthensTh. D. Papadopoulou24  Greek teams are doing very interesting and important work at HERA on Measurements & Searches

25. ECFA Meeting-AthensTh. D. Papadopoulou25  The Greek teams will continue their responsibilities to complete Data Analysis from HERA  and finish the papers under preparation  We expect in the near future to continue this interesting physics at LHeC !

26. ECFA Meeting-AthensTh. D. Papadopoulou26 HERA to LHeC : An Interesting Physics for near Future ! From the 1st CERN-ECFA LHeC Workshop