1. A.MagnonCOMPASS week, PRAGUE August 1 st -5 20051 COMPASS muon programme Alain Magnon DAPNIA/SPhN (CEA Saclay) On behalf of the COMPASS Collaboration

2. A.MagnonCOMPASS week, PRAGUE August 1 st -5 20052 Highlights about results, upgrades, prospects, - SPSC Villars meeting 22-28 Sept 2004 - SPSC71 meeting 3 May 2005 (G. Mallot) - SPSC72 meeting 5 July 2005 - Talks by Paolo P., Sonia H. & Alex K. (section 4) Vadim A. (section 5) 2006 & beyond ? Content

3. A.MagnonCOMPASS week, PRAGUE August 1 st -5 20053 Report on the SPSC Villars Meeting September 22-28 2004 John Dainton University of Liverpool, GB (on behalf of the SPSC) Villars 2004

4. A.MagnonCOMPASS week, PRAGUE August 1 st -5 20054 Report on the SPSC Villars Meeting September 22-28 2004 John Dainton University of Liverpool, GB (on behalf of the SPSC) 1.Framework 2.Machines and Beams 3.Heavy Ions 4.Neutrinos 5.Soft and Hard Protons 6.Antiproton Physics 7.Flavour Physics 8.Other Topics 9.Summary Villars 2004 COMPASS Report on the SPSC Villars meeting by John Dainton, University of Liverpool (CERN-SPSC-2005-010 SPSC-M-730 February 28 th 2005, available on Web)

5. A.MagnonCOMPASS week, PRAGUE August 1 st -5 20055 Bielefeld, Bochum, Bonn (ISKP, PI), Burdwan and Calcutta, CERN, Dubna (LPP, LNP), Erlangen, Freiburg, Lisbon, Mainz, Moscow (INR, LPI, MSU), Munich-LMU, Munich-TU, Nagoya, Prague (CU, CUT, TUL), Protvino, Saclay, Tel Aviv, Torino (Univ., INFN), Trieste (Univ.,INFN), Warsaw (SINS), Warsaw (TU) More than 220 physicists from 28 Institutes COMPASS Collaboration

6. A.MagnonCOMPASS week, PRAGUE August 1 st -5 20056 Muon beam programme Quarks and gluon polarisation in polarised (longitudinal) nucleons Transverse spin distribution Lambda polarisation Diffractive vector-meson production Hadron structure and spectroscopy Hadron beam programme Polarisibility of pions and kaons (Primakoff reaction) Exotics q-states, glue balls Semi-leptonic decays of charmed baryons Double charmed hadrons Physics programme GPDs (DVCS, HEMP) - under consideration - Nicole d’Hose talk Stephan Paul talk

7. A.MagnonCOMPASS week, PRAGUE August 1 st -5 20057 SM1 dipole SM2 dipole Polarised Target HCAL1 Muon-filter1,MW1 SPS 160 GeV 2.10 8  /spill Micromegas,DC,SciFi Gems,SciFi,DCs,straws MWPC Gems Scifi trigger-hodoscopes Silicon Spectrometer 2002 -> 2004 RICH_1Gem_11 ECAL2,HCAL2 straws,MWPC,Gems,SciFi straws Muon-filter2,MW2 DW45 SciFi Veto

8. A.MagnonCOMPASS week, PRAGUE August 1 st -5 20058 COMPASS objectives Original programme set for about 5 years (1) of running at 150 days/year with 14.4s supercyle and  SPS = 80%. i.e. 7.2  10 5 spills/year i.e. 10 19 PoT/year (2  10 8  /spill) (1) HMC (4 years) - CHEOPS (2 years)

9. A.MagnonCOMPASS week, PRAGUE August 1 st -5 20059 2002 2003 2004 Beam (1) 106days 90d 110d є SPS+BL (2).89.63.67 Preparation ~30d 7d 3d є Spectro (3).77.83.87 Data taking (4) 44d 39d 61d muon (L/T) 33d/11d 30d/9d 47d/14d Data taking 2002 – 2004 (1) Scheduled beam excluding MDs (4) L/T Longitudinal/Transverse sharing ~ 80/20 (2) Inefficiency from SPS, beam line, etc (3) ~ 0.90 additional due to time needed to rotate spin and calibrate spectrometer 2004 19d 4d 15d hadron

10. A.MagnonCOMPASS week, PRAGUE August 1 st -5 200510 Data taking 2002 - 2004 muon: 2002 + 2003 + 2004 -> 11.6  10 5 spills request: 7.2  10 5 spills/year  2.5 (proposal-year) Pilot hadron run: 2004 -> ~ 0.7  10 5 spills We got ~ 1.6 (proposal-year)

11. A.MagnonCOMPASS week, PRAGUE August 1 st -5 200511 Highlights (SPSC71 status report) : - g 1 - transversity -  polarisation -  G/G from high p T hadron pairs -  G/G from open-charm - more … Physics results

12. A.MagnonCOMPASS week, PRAGUE August 1 st -5 200512 most precise measurement for 0.004 < x < 0.03 PLB 612 (2005) 154 new NLO QCD fit, precision of a 0 improves factor 2 ( = 4 GeV 2 ) g 1 of the deuteron 2002-2003 data

13. A.MagnonCOMPASS week, PRAGUE August 1 st -5 200513 single transverse-spin asymmetries (2002 data) - Collins: related to transverse quark distributions - Sivers : related to intrinsic k T PRL 94,202002 (2005) Towards transversity Collins Sivers h+h+ h-h-

14. A.MagnonCOMPASS week, PRAGUE August 1 st -5 200514 all asymmetries compatible with zero measure product of chiral-odd FF and transverse-PDF - is the analysing power of Collins FF small? -or are the transverse parton distributions small? (proton-neutron cancellation in deuteron ?) try other polarimeters - interference FF of two hadrons - lambda polarisation Quark polarimeters

15. A.MagnonCOMPASS week, PRAGUE August 1 st -5 200515 Theoretical work on Sivers SSA “Extracting the Sivers function from polarized SIDIS data and making predictions” - Phenomelogical model whose parameters are constrained by HERMES proton measurements. - COMPASS 2002 preliminary results for Sivers effect are in agreement with the model. M. Anselmino et al. hep-ph/057181 (including HERMES Prel. Results shown at DIS05)

16. A.MagnonCOMPASS week, PRAGUE August 1 st -5 200516 M. Anselmino et al. hep-ph/057181 Theoretical work on Sivers SSA “Predictions of Sivers asymmetries on a proton target”

17. A.MagnonCOMPASS week, PRAGUE August 1 st -5 200517 Expected accuracy for Collins asymmetries 2002 2002-4 2006

18. A.MagnonCOMPASS week, PRAGUE August 1 st -5 200518 Strategies to suppress background: 1) Open charm production: q = c unique, no background charm fragmentation, 1.2 D 0 per event D 0 -> K - π + (BR 4%), D * + (~20%) -> D 0 π + 2) High-p T hadron pair production: q=u,d,s background from non PGF events & resolved  pQCD scale set by: 1) ŝ > 4m c 2 or 2) ŝ > (p t1 +p t2 ) 2 ΔG/G from Photon-Gluon Fusion Photon Gluon Fusion LOW STAT. HIGH STAT. Needed since Q 2 ~ 0

19. A.MagnonCOMPASS week, PRAGUE August 1 st -5 200519 a LL : calculable partonic asymmetries R : Monte-Carlo (Lepto/Phytia depending on Q 2 ) Photon Gluon FusionLeading order ProcessQCD-Compton e,  N measured h1h1 h2h2 ΔG/G from high-p T hadron pair

20. A.MagnonCOMPASS week, PRAGUE August 1 st -5 200520 Q 2 < 1GeV 2 250000 evts Q 2 > 1GeV 2 28000 evts 2002 and 2003 data - p T,1, p T,2 > 0.7 GeV, p 2 T,1 + p 2 T,2 > 2.5 GeV 2, - for statistical reasons use A || / D - D depolarisation factor, - exact formula used in analysis high-p T hadron pairs Q 2 1GeV 2

21. A.MagnonCOMPASS week, PRAGUE August 1 st -5 200521 more difficult than large Q 2 contributions from resolved photons - spin dependent structure of the photon perturbative part calculable non-perturbative part: - min/max VMD scenarios (Glück, Reya, Sieg) - tuning of intrinsic k T partons in the photon nucleon parameters - tuning of fragmentation functions - tuning of intrinsic k T in nucleon high-p T hadron pairs: Q 2 <1GeV 2

22. A.MagnonCOMPASS week, PRAGUE August 1 st -5 200522 Q 2 >1GeV 2 : Q 2 <1GeV 2 : Gluon polarisation, high p T pairs 2002-2003 data

23. A.MagnonCOMPASS week, PRAGUE August 1 st -5 200523  G = 2.48  G = 0.62  G = 0.16 Gluon polarisation ΔG/G (x g ≈ 0.1) is small GRSV2000 NLO fits to g 1  2 = 3 Gev 2  G>1 disfavoured

24. A.MagnonCOMPASS week, PRAGUE August 1 st -5 200524 Open charm: D’s from D*’s requiring the slow pion in D* → D π s → K π π s D 0 → K π π 0

25. A.MagnonCOMPASS week, PRAGUE August 1 st -5 200525 Gluon polarisation, D 0 & D * events 2002-2003 data  G/G = -1.08 +/- 0.73 = 0.15 +/- 0.08

26. A.MagnonCOMPASS week, PRAGUE August 1 st -5 200526  G = 2.48  G = 0.62  G = 0.16 Gluon polarisation GRSV2000 NLO fits to g 1

27. A.MagnonCOMPASS week, PRAGUE August 1 st -5 200527 2002 – 2004 -> 2006 FoM(  G/G)  G/G)=1/FoM 1/2 We work very hard to increase FoM FoM Figure of Merit for open charm

28. A.MagnonCOMPASS week, PRAGUE August 1 st -5 200528 FoM increase in 2006 (with upgrades): New COMPASS magnet: 1.3 Rich upgrade: 1.5 Ecal: 1.2 K below threshold: 1.1 100 days of beam: 1.3 -> (~.9) total: 3.4 -> (~2.4) Figure of Merit for open charm

29. A.MagnonCOMPASS week, PRAGUE August 1 st -5 200529 Large Angle Spectrometer 2002-3-4-6 DCs: 3 Straws: 1 1/2 2  1/2 end 2002 downstream of SM2..... DC1 DC2 DC4 Straws COMPASS PT solenoid SMC solenoid Initial lay-out Modified ~ 200 mrd ~ 70 mrd

30. A.MagnonCOMPASS week, PRAGUE August 1 st -5 200530 COMPASS Oxford Danfysik magnet OD magnet presently tested and instrumented in Saclay Some delays... Magnet will be delivered to CERN in November

31. A.MagnonCOMPASS week, PRAGUE August 1 st -5 200531 COMPASS OD magnet 1 st attempt to get uniform field (24.06): encouraging 100 ppm Request is ≤ 100 ppm

32. A.MagnonCOMPASS week, PRAGUE August 1 st -5 200532 RICH (PDs) upgrade in 2006 5 m 6 m 3 m PhotonDetectors: CsI MWPC mirrorwall vessel radiator: C 4 F 10

33. A.MagnonCOMPASS week, PRAGUE August 1 st -5 200533 central region ‘maPMT’: multi-anode PMTs lens system MAD4 preamp F1 TDCs, excellent time resolution outer region ‘APV’: keep CsI photodetector new readout based on APV chips good timing resolution ‘no’ DAQ dead time beam RICH upgrade in 2006

34. A.MagnonCOMPASS week, PRAGUE August 1 st -5 200534 RICH maPMT elements tested in T11 beam approved by INFN in April, design of optics finished, PMs ordered (600) delivery schedule Q3 2005 till Jan 2006 ready spring 2006 Trieste, Turin + Bonn, Erlangen, Freiburg, Lisbon, Mainz, Prague (2)

35. A.MagnonCOMPASS week, PRAGUE August 1 st -5 200535 APV RICH project R/O successfully tested during 2004 on the Rich installation and test Q1 /06 Trigger time x25ns dR, cm TU-Munich, Saclay BORA CONNECTO R +3.7V, -3.7V, GND 10 PIN HE10CONNE CTOR +5V, -5V, GND 10 PIN HE14CONNE CTOR 4 Differential ADC Outputs RJ45 CONNECT OR CLK, TRIGGER, I2C + & - 1.25V Regul ator + & - 1.25V Regul ator + & - 1.25V Regul ator + & - 1.25V Regul ator POWER_MUX ( STRAPS ) & +/- 3.3V Regulators +/- 5V or +/-3.7V x 4 Fano ut +/- 3.3 or 3.7 V 4 differential amplifiers J8J7J6J5J4J3J2J1J0 APV3APV2APV1APV0 4848 1212 3636 4848 2424 4848 4848 1212 3636 4848 2424 4848 Figure 1 : Block-diagram of the new board Design based on GEM & Si FEE Provides signal timing accuracy <200ns

36. A.MagnonCOMPASS week, PRAGUE August 1 st -5 200536 Large drift chamber DC4 Chamber under construction by Saclay frames delivered assembly and test Q4/05-Q1/06 operational April 2006

37. A.MagnonCOMPASS week, PRAGUE August 1 st -5 200537 ECAL1 Plan to equip entire ECAL1 for 2006 (Protvino) Also beneficial for open- charm D 0 → K π π 0 D *0 → D 0 π 0 s

38. A.MagnonCOMPASS week, PRAGUE August 1 st -5 200538 SPS in 2006 Schedule prepared by SPS Coordinator & proposed by SPSC COMPASS - 2006 = 3440 h–> 142 days COMPASS – (2004)= 3120 h–> 130 days 110(  20(h)

39. A.MagnonCOMPASS week, PRAGUE August 1 st -5 200539 SPS in 2006 Schedule was not accepted by CERN RB New (draft) schedule: COMPASS – 2006’ 2728 h–> 113 days (not 142 d) restart of SPS etc … є SPS+BL ~ 0.7 or lower ~ 0.5 proposal year

40. A.MagnonCOMPASS week, PRAGUE August 1 st -5 200540 Conclusion muon programme was for ~2.5 years (SPS proposal-years) with 1.6 year of running, important physics results were obtained, also : - 3 physics papers (g1d, Collins/Sivers asym., penta-q search) -  G/G with remarkable precision from high p T low Q 2 -  G/G) from D 0 (0.73 -> 0.43 with 2004)

41. A.MagnonCOMPASS week, PRAGUE August 1 st -5 200541 Conclusion Ambitious objective for 2006 Complete proposed muon programme - get error on  G/G from charm close to error of proposal, - run both with deuteron & proton target 1/ successful equipment upgrades 2/ sufficient beam allocation from SPS (?)

42. A.MagnonCOMPASS week, PRAGUE August 1 st -5 200542 Additional slides

43. A.MagnonCOMPASS week, PRAGUE August 1 st -5 200543  h 1 d,h 1 p) vs acceptance SMC magnet COMPASS magnet

44. A.MagnonCOMPASS week, PRAGUE August 1 st -5 200544 Resolved photon contributions e.g.: qq’→ qq’ PYTHIA

45. A.MagnonCOMPASS week, PRAGUE August 1 st -5 200545 Example: k T tuning systematic error - determined using 15 independent MC simulations - exploring the parameter space  in k T of nucleon and photon  fragmentation functions  parton shower on/off,  renormalisation scale nucleon photon

46. A.MagnonCOMPASS week, PRAGUE August 1 st -5 200546 Data versus MC excellent to good agreement for all kinematics variables let’s get

47. A.MagnonCOMPASS week, PRAGUE August 1 st -5 200547 Data versus MC excellent to good agreement for all kinematics variables let’s get

48. A.MagnonCOMPASS week, PRAGUE August 1 st -5 200548 x Bj < 0.05, can neglect QCD Compton and LO LEPTO tuning à la SMC high-p T xpTpT p high-p T hadron pairs: Q 2 >1GeV 2

49. A.MagnonCOMPASS week, PRAGUE August 1 st -5 200549 Open charm: MC studies AROMA Monte Carlo, PGF only background subtracted 2003 data (side bands) D’s indeed from PGF ? Data understood? good agreement data / MC hard z-distribution z pTpT y

50. A.MagnonCOMPASS week, PRAGUE August 1 st -5 200550 Open charm: MC studies a LL from one hadron from PGF reconstructed Correlation of generated and reconstructed a LL Analysis uses event weighting with a LL deduced from hadron kinematic variables

51. A.MagnonCOMPASS week, PRAGUE August 1 st -5 200551 RICH upgrade in 2006