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RECENT COMPASS RESULTS ON TRANSVERSE PHYSICS

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Presentation on theme: "RECENT COMPASS RESULTS ON TRANSVERSE PHYSICS"— Presentation transcript:

1 RECENT COMPASS RESULTS ON TRANSVERSE PHYSICS
Takahiro Iwata Yamagata University on behalf of the COMPASS Collaboration COMPASS presentations L-Spin : Celso Franco Future plans: Norihiro Doshita Circum-Pan-Pacific Symposium on High Energy Spin Physics, Cairns, Australia, June , 2011

2 OUTLINE The experimental setup Data taking history
Introduction to COMPASS The experimental setup Data taking history Transverse spin and TMD effects Asymmetries with a polarized proton target Azimuthal asymmetries in unpolarized SIDIS Summary Circum-Pan-Pacific Symposium, Cairns, Australia, June , 2011 Takahiro Iwata

3 ＣＯＭＰＡＳＳ ａｔ CERN Lake LEMAN LH C Airport SPS (p:450GeV) CERN (France) N
Nucleon Structure Hadron Spectroscopy LH C COMPASS Airport SPS (p:450GeV) CERN (France) N CERN (Suisse) 21/11/2018 BEACH08 26 june 2008 3 Circum-Pan-Pacific Symposium, Cairns, Australia, June , 2011 Takahiro Iwata

4 THE SPECTROMETER two stage spectrometer Large Angle Spectrometer (SM1)
Small Angle Spectrometer (SM2) tracking, calorimetry, PID Configuration in Muon program SciFi Silicon Micromegas GEMs Straws SDC MWPC W45 MuonWall SM2 E/HCAL E/HCAL SM1 0.003 < x < 0.5 10-3 < Q2 < 10 GeV2 Polarised Target MuonWall RICH Pol. beam 160GeV, pol. 80% high energy beam broad kinematical range large angular acceptance Circum-Pan-Pacific Symposium, Cairns, Australia, June , 2011 Takahiro Iwata

5 THE POLARIZED TARGET SYSTEM
Solid polarized target operated in Dynamic Nuclear Polarization technique with a dilution refrigerator PT magnet: +180~-180 mrad geometrical acceptance To match larger acceptance: 3 target cells: reduction of false asymmetries Target: NH3 for proton , 6LiD for deuteron  longitudinal & transverse mode available very long relaxation time (∼ 4000 h) magnetic field rotation without polarization loss  Polarization of NH3 -92%, +88%, -83% Downstream Middle Upstream Circum-Pan-Pacific Symposium, Cairns, Australia, June , 2011 Takahiro Iwata

6 THE RICH DETECTOR radiator gas: C4F10 mirror wall: 20 m2 surface
photon detectors radiator gas: C4F10 mirror wall: 20 m2 surface photon-detectors: outer part (75%) MWPC(pad RO) with CsI cathode inner part(25%) 576 MAPMTs with indiv. telescope threshold momenta pp = 2 GeV/c pK = 9 GeV/c pP =17 GeV/c Installed in 2005, Used in data taking from 2006 Circum-Pan-Pacific Symposium, Cairns, Australia, June , 2011 Takahiro Iwata

7 DATA TAKING HISTORY 2002 - 2011 2002 Data taking started
muon program with 160 GeV polarized muon LiD polarized target ( pol. deuterons) L-mode: 80 / T-mode: 20 , DG/G measurement 2005 no data taking NH3 polarized target (pol. protons) L-mode: 50 /T-mode: 50 2008, 2009 hadron program with hadron beam at 190 GeV 2010 NH3 polarized target (pol. protons) only T-mode ditto only L-mode Circum-Pan-Pacific Symposium, Cairns, Australia, June , 2011 Takahiro Iwata

8 Transverse Spin and TMD Effects
Circum-Pan-Pacific Symposium, Cairns, Australia, June , 2011 Takahiro Iwata

9 TRANSVERSE SPIN &TMD EFFECTS IN COMPASS
Transversity PDF quark with spin parallel to the nucleon spin in a transversely polarized nucleon DTq(x) = q↑↑(x) - q↑↓(x) from Collins asym. in SIDIS single hadron production, two-hadron asym. ,transverse L polarization, … TMD effects angular distributions caused by the parton’s transverse momentum related to orbital angular momentum of quark from Sivers asym. in SIDIS, azimuthal distribution of hadrons in unpolarized SIDIS Circum-Pan-Pacific Symposium, Cairns, Australia, June , 2011 Takahiro Iwata

10 Transverse Spin Effects
Circum-Pan-Pacific Symposium, Cairns, Australia, June , 2011 Takahiro Iwata

11 SINGLE HADRON ASYMMETRIES IN SIDIS
SIDIS cross-section for transv. PT Collins Sivers Collins angle: Azim. angle of a hadron wrt struck quark spin FC = fh - fS’ (= fh +fS- p) Sivers angle:Azim. angle of a hadron wrt nucleon spin FS= fh - fS nucleon spin (initial quark spin) struck quark spin Scattering plane fS = azim. angle of nucleon spin (initial quark spin) fS’ = azim. angle of struck quark spin fS= p- fS’ （due to helicity conservation) fh = azim. angle of leading hadron quark direction hadron （Breit frame） Circum-Pan-Pacific Symposium, Cairns, Australia, June , 2011 Takahiro Iwata

12 COLLINS ASYMMETRY Collins Asymmetry Modulation wrt the Collins angle
± : opposite orientation of the transverse spin of the nucleon PT is the target polarization; DNN is the transverse spin transfer coefficient initial  struck quark, given by QED Transvesity Collins fragmentation function Circum-Pan-Pacific Symposium, Cairns, Australia, June , 2011 Takahiro Iwata

13 COLLINS ASYMMETRIES h+ h− h+ h− proton deuteron
PLB 692 (2010), 240 deuteron h+ h− PLB 673 (2009), 127 ・　large asymmetry for proton : about 10% , for both h+ and h- ・　deuteron result  opposite sign of DTu and DTd Circum-Pan-Pacific Symposium, Cairns, Australia, June , 2011 Takahiro Iwata

14 +- NEW RESULTS FOR p & K K+- proton large asymmetry for p But,
not clear for K proton K+- Circum-Pan-Pacific Symposium, Cairns, Australia, June , 2011 Takahiro Iwata

15 COMPASS-HERMES COMPARISON
in good agreement proton + - COMPASS HERMES for charged pions Circum-Pan-Pacific Symposium, Cairns, Australia, June , 2011 Takahiro Iwata

16 TRANSVERSITY GLOBAL FITS
Fitting to AColld from COMPASS, ACollp from HERMES and Collins F.F. from BELLE (e+e- scattering)  predictions good agreement with the new proton data of COMPASS ・　DTu and DTd have opposite sign as expected from deuteron data COMPASS proton 2007 Transvesity u d Anselmino et al. Circum-Pan-Pacific Symposium, Cairns, Australia, June , 2011 Takahiro Iwata

17 TWO-HADRON ASYMMETRY Two hadrons produced in SIDIS
Modulation wrt the angle between two-hadron plane and struck quark spin i f h l-l’ f : target dilution facto PT : target polarization DNN : transverse spin transfer coefficient initial  struck quark Two-hadron asymmetry fS = angle of nucleon spin (=initial quark spin) fS’ = angle of final (struck) quark spin fS= p - fS’ （due to helicity conservation) fR = angle of two-hadron plane fRS =fR –fS’ = fR +fS- p nucleon spin (=initial quark spin) quark direction Trento conventions see hep-ph/ Breit frame Circum-Pan-Pacific Symposium, Cairns, Australia, June , 2011 Takahiro Iwata

18 TWO-HADRON ASYM. FOR PROTON
transversity Interference fragmentation function ( not well known ) Proton Ks  p+ + p- r  p+ + p- Clear effect observed Circum-Pan-Pacific Symposium, Cairns, Australia, June , 2011 Takahiro Iwata

19 COMPASS-HERMES COMPARISON
in good agreement with the HERMES results Proton HERMES values scaled with 1/Dnn Global fit possible when interference fragmentation function measured (BELLE) Circum-Pan-Pacific Symposium, Cairns, Australia, June , 2011 Takahiro Iwata

20 TRANSVERSE L POLARIZATION
Transversity can be studied through transverse L polarization Transversity Polarized fragmentation function to L PT : target polarization; f : target dilution factor D(y): transverse spin transfer coefficient initial  struck quark, given by QED Circum-Pan-Pacific Symposium, Cairns, Australia, June , 2011 Takahiro Iwata

21 TRANSVERSE L POLARIZATION
L and L-bar on transversely polarized proton target two hadron events with the 2nd. vertex (v0) e, p, K rejection from p-track candidates by RICH Armenteros-Podolanski plot ( for V0 , after RICH selection) After RICH selection Polarization measured via parity violating decay Circum-Pan-Pacific Symposium, Cairns, Australia, June , 2011 Takahiro Iwata

22 L POLARIZATION ON PROTON TARGET
The measured polarizations are compatible with zero  small DTDL/q Circum-Pan-Pacific Symposium, Cairns, Australia, June , 2011 Takahiro Iwata

23 TMD Effects Circum-Pan-Pacific Symposium, Cairns, Australia, June , 2011 Takahiro Iwata

24 SIVERS EFFECT IN SIDIS Modulation wrt Sivers angle
± refer to the opposite orientation of the transverse spin of the nucleon Sivers angle: Azim. angle of a hadron wrt the nucleon spin FS= fh – fS nucleon spin struck quark spin Sivers PDF Scattering plane correlation between transverse momentum of the quark and the transverse polarization of the nucleon quark direction hadron （Breit frame） Circum-Pan-Pacific Symposium, Cairns, Australia, June , 2011 Takahiro Iwata

25 SIVERS ASYMMETRIES h+ h− slightly positive for h+ compatible with zero
COMPASS proton 2007 Proton slightly positive for h+ PLB 692 (2010), 240 Deuteron compatible with zero PLB 673 (2009), 127 Circum-Pan-Pacific Symposium, Cairns, Australia, June , 2011 Takahiro Iwata

26 SIVERS ASYMMETRIES FOR p & K
Proton HERMES data show clear signals for p+ & K+ No definite conclusion with the COMPASS data due to limited statistics More statistics with 2010 + - Proton K+ K- Circum-Pan-Pacific Symposium, Cairns, Australia, June , 2011 Takahiro Iwata

27 Inv. mass of the hadronic final state
COMPARISON IN DETAIL COMPASS h+ PLB 692(2010) HERMES p+ PRL 103(2009)152002 COMPASS results smaller by a factor ~2 h+ COMPASS proton 2007 Inv. mass of the hadronic final state Possible explanation kinematical regions are different between COMASS and HERMES lower energy region probed in HERMES possible W dependence ? Circum-Pan-Pacific Symposium, Cairns, Australia, June , 2011 Takahiro Iwata

28 Asymmeties for unpol. target
Circum-Pan-Pacific Symposium, Cairns, Australia, June , 2011 Takahiro Iwata

29 AZIMUTHAL ASYMMETRIES FOR UNPOL. TARGET
TMD effects in SIDIS for unpolarized targets fh : azumuthal angle of hadron from scatt. plane cos h and cos 2 h modulations affected by Cahn effect & Boer-Mulders Effect Circum-Pan-Pacific Symposium, Cairns, Australia, June , 2011 Takahiro Iwata

30 CAHN EFFECT kinematical effect by transverse momentum of quark
elementary cross-section: elementary Mandelstam variables: Taking account of transverse momentum of quark k: initial quark momentum kT: initial quark transverse momentum k’ : final quark momentum Circum-Pan-Pacific Symposium, Cairns, Australia, June , 2011 Takahiro Iwata

31 BOER-MULDERS EFFECT Boer-Mulders function
Correlation between quark transverse momentum and quark spin in unpolarized nucleon Contributes to cos h and cos 2h moments with convoluted Collins function Circum-Pan-Pacific Symposium, Cairns, Australia, June , 2011 Takahiro Iwata

32 strong dependence on z, PTh
COSf h MODULATION COMPASS LiD large negative signals over all the x range strong dependence on z, PTh different for h+ & h- h+ Preliminary COMPASS LiD h- Preliminary ( T- mode samples) Circum-Pan-Pacific Symposium, Cairns, Australia, June , 2011 Takahiro Iwata

33 strong dependence on z, x, PTh
COS 2f h MODULATION COMPASS LiD large signals at small-x strong dependence on z, x, PTh different for h+ & h- h+ Preliminary COMPASS LiD h- Preliminary ( T- mode samples) Circum-Pan-Pacific Symposium, Cairns, Australia, June , 2011 Takahiro Iwata

34 COMPASS is a major player in the nucleon spin physics
SUMMARY COMPASS is a major player in the nucleon spin physics Transverse Spin and TMD Effects have been intensively studied Collins and Sivers asymmetries for  and K on a transversely polarized proton and a deuteron target two-hadron asymmetries small transverse Λ polarization , compatible with zero large azimuthal asymmetries of hadrons produced on an unpolarized deuteron target Circum-Pan-Pacific Symposium, Cairns, Australia, June , 2011 Takahiro Iwata

35 Circum-Pan-Pacific Symposium, Cairns, Australia, June 20-24 , 2011
BACKUP SLIDES Takahiro Iwata Circum-Pan-Pacific Symposium, Cairns, Australia, June , 2011

36 SIVERS ASYMMETRY FOR PROTON
Circum-Pan-Pacific Symposium, Cairns, Australia, June , 2011 Takahiro Iwata

37 SIVERS PDF GLOBAL FIT Global fit using AdSiv(±) and AdSiv(K±) from COMPASS and ApSiv(±) and ApSiv(K±) from HERMES: M. Boglione in collaboration with M. Anselmino, U. D’Alesio, A. Kotzinian, S. Melis, F. Murgia, A. Prokudin, C. Turk Circum-Pan-Pacific Symposium, Cairns, Australia, June , 2011 Takahiro Iwata

38 SIVERS ASYM. DATA V.S. PREDICTION
comparison with recent M. Anselmino et al. predictions arXiv: HERMES proton data COMPASS deuteron data marginal agreement with COMPASS proton data Circum-Pan-Pacific Symposium, Cairns, Australia, June , 2011 Takahiro Iwata

39 TWO-HADRON ASYMMETRY - Deuteron-
Circum-Pan-Pacific Symposium, Cairns, Australia, June , 2011 Takahiro Iwata

40 TRANSVERSE MOMENTUM DEPENDENT PDFs
Nucleon unpol. long. pol. trans. pol. number density Sivers unpol. Nucleon Parton T-odd helicity long. pol. RICH + AGS annual Users’ Meeting June 6, 2006, ags/users meetings/workshops/basp , and paper in preparation. Quark transversity Boer-Mulders survive after integration over kT trans. pol. T-odd Takahiro Iwata Circum-Pan-Pacific Symposium, Cairns, Australia, June , 2011

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