Measurement of Transverse Spin Effects at COMPASS

Slides:



Advertisements
Similar presentations
1 New target transverse spin dependent azimuthal asymmetries from COMPASS experiment Bakur Parsamyan INFN & University of Turin on behalf of the COMPASS.
Advertisements

1 First Measurement of the Structure Function b 1 on Tensor Polarized Deuteron Target at HERMES A.Nagaitsev Joint Institute for Nuclear Research, Dubna.
Transversity and Transverse-Momentum-Dependent Partonic Functions Alessandro Bacchetta.
Measurement of polarized distribution functions at HERMES Alessandra Fantoni (on behalf of the HERMES Collaboration) The spin puzzle & the HERMES experiment.
Mauro Anselmino, Prague, August 1, 2005 Hadron Structure and Hadron Spectroscopy Transversity (transverse spin and transverse motion) Transversity distributions.
Delia Hasch TMDs & friends from lepton scattering -experimental overview- INT workshop on “3D parton structure of the nucleon encoded in GPDs & TMDs”,
1 Updates on Transversity Experiments and Interpretations Jen-Chieh Peng Transversity Collaboration Meeting, JLab, March 4, 2005 University of Illinois.
New results on SIDIS SSA from JLab  Physics Motivation  Double spin asymmetries  Single Spin Asymmetries  Future measurements  Summary H. Avakian.
Single-spin asymmetries in two hadron production of polarized deep inelastic scattering at HERMES Tomohiro Kobayashi Tokyo Institute of Technology for.
Jim Stewart DESY Measurement of Quark Polarizations in Transversely and Longitudinally Polarized Nucleons at HERMES for the Hermes collaboration Introduction.
F.-H. Heinsius (Universität Freiburg/CERN) Introduction Gluon polarization in the nucleon Transverse spin distribution Newest Results from the Experiment.
Single-Spin Asymmetries at CLAS  Transverse momentum of quarks and spin-azimuthal asymmetries  Target single-spin asymmetries  Beam single-spin asymmetries.
R. Joosten, Oct. 7, 2008 Measurement of TMDs in Semi-Inclusive DIS in Semi-Inclusive DIS Rainer Joosten University of Bonn Charlottesville, VA, October.
F.-H. Heinsius (Universität Freiburg) on behalf of the COMPASS collaboration Gluon polarization measurements at DIS 2004, Štrbské Pleso,
Measurements with Polarized Hadrons T.-A. Shibata Tokyo Institute of Technology Aug 15, 2003 Lepton-Photon 2003.
Transverse Spin dependent Fragmentation Functions at Anselm Vossen (University of Illinois) Matthias Grosse Perdekamp (University of Illinois) Martin Leitgab.
HERMES results on azimuthal modulations in the spin-independent SIDIS cross section Francesca Giordano DESY, Hamburg For the collaboration Madrid, DIS.
Possibility of direct extraction of the transversitiy from polarized Drell-Yan measurement in COMPASS Transversity Drell-Yan for transverstiy transverse.
TMD flavor decomposition at CLAS12 Patrizia Rossi - Laboratori Nazionali di Frascati, INFN  Introduction  Spin-orbit correlations in kaon production.
Latest results from COMPASS TMD physics Anna Martin Trieste University & INFN on behalf of the COMPASS Collaboration.
Delia Hasch Transversity & friends from HERMES International workshop on hadron and spectroscopy, Torino, Italy, 31. March – 02. April 2008 outline outline.
Single-spin asymmetry in interference fragmentation on a transversely polarized hydrogen target at HERMES Tomohiro Kobayashi Tokyo Institute of Technology.
Polarised DIS Experiment Gerhard Mallot. G. Mallot/CERN Spin Summer School, BNL, 2004 Plan Lecture I –introduction –kinematics –the cross section –structure.
F.-H. Heinsius (Universität Freiburg) on behalf of the COMPASS collaboration Gluon polarization measurements at DIS 2004, Štrbské Pleso,
The transverse structure of the nucleon (resolving the quark motion inside a nucleon) Mauro Anselmino, Torino University and INFN, JLab, December 15, 2006.
New results from Delia Hasch DPG Spring Meeting 2004 – Nuclear Physics Cologne (Germany) March, (on behalf of the HERMES Collaboration) Exotic.
R. Joosten, Oct. 7, 2008 Measurement of TMDs in Semi-Inclusive DIS in Semi-Inclusive DIS Rainer Joosten University of Bonn Charlottesville, VA, October.
Transversity 2005, Como Two-hadron Adam Mielech INFN Trieste on behalf of COMPASS collaboration 7-10th. September 2005.
Transverse Spin Dependent Di-Hadron Fragmentation Functions at Anselm Vossen (University of Illinois) Matthias Grosse Perdekamp (University of Illinois)
1 DIS 2007, Munich, April 19, 2007 Aram Kotzinian Beyond Collins and Sivers: further measurements of the target transverse spin-dependent azimuthal asymmetries.
Future Drell-Yan program of the COMPASS cllaboration Norihiro DOSHITA (Yamagata University) On behalf of the COMPASS collaboration 2016/7/31N. Doshita.
Prague (CZ), August 1stPaolo Pagano (INFN - Trieste)1 COMPASS results: TRANSVERSITY Paolo Pagano On behalf of the COMPASS collaboration.
International Committee for Spin Physics Symposia XIII WORKSHOP ON HIGH ENERGY SPIN PHYSICS Dubna, Russia September 1 - 5, 2009 AZIMUTHAL ASYMMETRIES IN.
A sideways look into the proton Transverse momentum and transverse spin in QCD Alessandro Bacchetta.
Spin physics with COMPASS
Unpolarized Azimuthal Asymmetries from the COMPASS Experiment
NUCLEON STRUCTURE OVERVIEW
COMPASS results on inclusive and semi–inclusive polarised DIS
「COMPASSでの核子スピン構造の研究」 STUDY OF SPIN STRUCTURE OF NUCLEON IN COMPASS
TMD experiments from COMPASS SIDIS
HIGHLIGHTS FROM THE COMPASS CERN
Measurements of quark transversity and orbital motion in hard scattering Yoshiyuki Miyachi Tokyo Institute of Technology.
Luciano Pappalardo for the collaboration
Experimental Study of Transversity
Collins and Sivers asymmetries on the deuteron from COMPASS data
Prague 2007 Collins and Sivers asymmetries
Physics with polarized antiprotons at GSI-PAX
Strangeness and Spin in Fundamental Physics
New Results for Transverse Spin Effects at COMPASS
RECENT COMPASS RESULTS ON TRANSVERSE PHYSICS
STUDY OF SPIN STRUCTURE OF NUCLEON AT COMPASS AND ITS CHALLENGES
on behalf of the COMPASS collaboration
Transversity New Results from COMPASS
Measurement of Transverse Spin Effects at COMPASS
Study of spin structure of nucleon in COMPASS - measurements for transversity with a transversely polarized target – T. Matsuda – Uni. of Miyazaki,
Larisa Nogach Institute of High Energy Physics, Protvino
SINGLE HADRON TRANSVERSE SPIN ASYMMETRIES FROM COMPASS
Intrinsic transverse momentum and the Sivers effect #
Searching for intrinsic motion effects in SIDIS
University of Erlangen-Nürnberg & DESY
RESULTS FOR TRANSVERSE SPIN PHYSICS AT COMPASS
Single Spin Asymmetry with a Transversely Polarized
TRANSVERSE SPIN EFFECTS
Transverse Spin COMPASS
Trieste University and INFN
TRANSVERSE SPIN EFFECTS IN COMPASS
Measurements of Transverse Spin Effects in SIDIS
transversity measurements by COMPASS
Determination of the gluon polarisation
ΔG/G Extraction From High-Pt Hadron Pairs at COMPASS
Presentation transcript:

Measurement of Transverse Spin Effects at COMPASS Anselm Vossen ALU Freiburg On Behalf of the COMPASS Collaboration

Outline Transversity kT dependent Quark Distribution q(x,kT) Outlook Possible Measurements Transversity at COMPASS Theory predictions kT dependent Quark Distribution q(x,kT) Sivers Effect Sivers Asymmetries at COMPASS Outlook

Structure of the Nucleon Collins effect m’ _ Lz-1 Lz _ + * * ? m _ + q Helicity base: independent amplitudes: Hadronic Tensor N _ +

Measuring Transversity Transversity base: Probabilistic interpretation  ↑  ↓ ↑   _ _ + = _ + Difference in densities for ↑, ↓ quarks in ↑ nucleon HERMES, BELLE:

Collins Fragmentation - Modell http://cerncourier.com/main/article/44/8/19/1 K. Bruhwel, TJNAF Collins Effekt in String Fragmentation (X. Artru)

Collins Effect in SIDIS Ph transverse momentum of the hadron S’ transverse spin of the struck quark m’ m S’ g* FC Ph x “Collins angle” C = h - s’ z Fragmentation Function for a transversely polarised quark into unpolarised hadron spin dependent part : “Collins fragmentation function” Number of Events:

Collins Asymmetries

Collins: Comparison with Theory A.V. Efremov, K. Goeke and P. Schweitzer, PRD73 (2006) 094025 DTq from Chiral Quark Soliton Model Collins FF from Fit to HERMES Data  unfav FF ~ - fav FF  DTu, DTd cancel in deuterium COMPASS 2002-2004

Transversity signal in 2 Hadron Correlations Azimuthal Asymmetry measurement similar to Collins Asymmetry extraction (z2P1+z1P2)/(z1+z2) =Ph S’ Ph F2H m m’ z x g*

Results, z Binning

Results, xBj binning

Predictions 2H Asymmetries Bacchetta, Radici: Phys.Rev. D74 (2006) 114007 p+-p- production

Sivers Effect + } x x M. Burkardt, PRD, 66, 114005(2002)

Sivers Effect m’ “Sivers angle” m S g* FS Ph x Modulation in FS of the hadron distribution Correlation between the nucleon spin and quark motion Sivers effect ≠0 ⇒ Quark angular momentum ≠ 0 z modulation in FS of the hadron distribution

Sivers Asymmetries

Sivers: Comparison with Theory M. Anselmino et al., PRD72 (2005) 094007 including transverse momenta, FF from literature 13 parameter fit to HERMES and COMPASS 2002 data to extract the Sivers functions comparison with COMPASS 2002-2004 data ok COMPASS 2002-2004

Conclusion/Outlook Measurement of Transversity and Sivers effect provides new insights in soft QCD effects Experiments have shown unexpected effects COMPASS data on deuteron is important to extract DTd and D0Td COMPASS measures this year with proton target Polarization data has often been the graveyard of fashionable theories. If theorists had their way, they might just ban such measurements altogether out of self-protection. J.D. Bjorken St. Croix, 1987

COMPASS 2004 Setup high energy beam Large angular acceptance Broad kinematical range two stages spectrometer Large Angle Spectrometer (SM1), Small Angle Spectrometer (SM2) tracking, calorimetry, PID NEW TECHNOLOGIES MuonWall SM2 E/HCAL E/HCAL SM1 MuonWall RICH m beam Polarised Target 2002-2004: 6LiD (Deuteron) dilution factor f = 0.38 polarization PT =50%

The RICH detector 3 m 6 m 5 m threshold momenta: pp = 2 GeV/c C4F10 photon detectors threshold momenta: pp = 2 GeV/c pK = 9 GeV/c pP =17 GeV/c fully efficient for transverse data in 2003 and 2004

COMPASS Transversly Polarised Target two 60 cm long cells with opposite polarization (systematics) dN/dz 4000 2000 -1000 1000 zvtx (mm) 2002-2004: 6LiD (Deuteron) dilution factor f = 0.38 polarization PT = 50% during data taking with transverse polarization polarization reversal in the 2 cells after ~ 5 days

COMPASS Experiment @ CERN COmmon Muon and Proton Apparatus for Structure and Spectroscopy SPS fixed target experiment at the CERN SPS 240 physicists from 28 Institutes, 11 Countries

h azimuthal angle of the hadron s’ azimuthal angle of the transverse spin of the struck quark s’ = p - s s azimuthal angle of the transverse spin of the initial quark “Collins angle” C = h - s’ = h + s - p

Predictions for 2H Signal Radici @ QCD N’06, Bacchetta, Radici: hep-ph/0608037 ARS ARS

Results, MInv Binning

Transverse Spin @ COMPASS Transverse Spin Measurements provide new insights into Spin Structure and Quark dynamics inside the nucleon COMPASS provides key measurements Collins (Transversity) Sivers (kT dependent unpol. PDF) M. Anselmino et al., PRD72 (2005) 094007 Efremov, Goeke, Schweitzer, PRD73 (2006) 094025 COMPASS 2002-2004 Predictions COMPASS 2002-2004 Predictions xBj xBj