First results on two-hadron interference fragmentation on a transversely polarized hydrogen target Paul van der Nat (on behalf of the HERMES collaboration)

Slides:

Advertisements

Similar presentations

1 Transversity Physics Update Jen-Chieh Peng Polarized 3 He and Tansversity Collaboration Meeting, JLab, October 21-22, 2005 University of Illinois at.

Advertisements

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

Transversity and inclusive 2π production M. Radici - Pavia chiral-odd partner Collins effect k £ P h ¢ S T 2h asymmetry R £ P h ¢ S T Dihadron.

QCD N06 - Monte Porzio Catone - 15/06/ SIDIS Cross Sections and Spin Asymmetries Predictions for Ongoing and Future Experiments M.Elena Boglione.

Measurement of polarized distribution functions at HERMES Alessandra Fantoni (on behalf of the HERMES Collaboration) The spin puzzle & the HERMES experiment.

DIS2003Erika Garutti1 Electro-production of f 0 (980) scalar meson at HERMES Erika Garutti (DESY) On behalf of the HERMES collaboration Physics introduction.

Constraining the polarized gluon PDF in polarized pp collisions at RHIC Frank Ellinghaus University of Colorado (for the PHENIX and STAR Collaborations)

Measurement of azimuthal asymmetries of the unpolarized cross-section at HERMES Francesca Giordano Charlottesville, USA, SPIN2008 Università degli studi.

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.

1 Transverse Spin Measurements at PHENIX John Koster for the PHENIX collaboration University of Illinois at Urbana-Champaign DIS /04/27.

Spin Azimuthal Asymmetries in Semi-Inclusive DIS at JLAB  Nucleon spin & transverse momentum of partons  Transverse-momentum dependent distributions.

Fragmentation Functions at Belle Anselm Vossen (University of Illinois) Matthias Grosse Perdekamp (University of Illinois) Martin Leitgab (University of.

Spin and azimuthal asymmetries in SIDIS at JLAB  Physics Motivation  Jlab kinematics and factorization  Double spin asymmetries  Single Spin Asymmetries.

New results on SIDIS SSA from JLab  Physics Motivation  Double spin asymmetries  Single Spin Asymmetries  Future measurements  Summary H. Avakian.

P. Bosted, DNP Spin and azimuthal asymmetries in SIDIS at JLAB  Physics Motivation  Jlab kinematics and factorization  Single Spin Asymmetries.

Single-spin asymmetries in two hadron production of polarized deep inelastic scattering at HERMES Tomohiro Kobayashi Tokyo Institute of Technology for.

H. Avakian, Pavia, Sep 6 1 Harut Avakian (JLab) Study of dihadron production at JLab with the 12 GeV CLAS dectector DiFF Workshop, Pavia, Sep 6, 2011 JLab.

1 Transversity and inclusive 2-pion production Marco Radici Pavia TJNAF, May 2005 In collaboration with: A. Bacchetta (Univ. Regensburg)

Measurements of Transverse Spin Effects with the Forward Pion Detector of STAR Larisa Nogach Institute of High Energy Physics, Protvino for the STAR collaboration.

Jim Stewart DESY Measurement of Quark Polarizations in Transversely and Longitudinally Polarized Nucleons at HERMES for the Hermes collaboration Introduction.

Single-Spin Asymmetries at CLAS  Transverse momentum of quarks and spin-azimuthal asymmetries  Target single-spin asymmetries  Beam single-spin asymmetries.

Quark Structure of the Proton – The Horizons Broaden! On behalf of the HERMES collaboration H. E. Jackson highlights.

J/  production in p+p collisions at PHENIX and gluon distribution QWG meeting at FNAL September Hiroki Sato (Kyoto University) for the PHENIX collaboration.

Strangeness and Spin in Fundamental Physics Mauro Anselmino: The transverse spin structure of the nucleon Delia Hasch: The transverse spin structure of.

1 Frascati, June 14, 2006 Aram Kotzinian Double spin azimuthal asymmetries A LT and A LL in semi-inclusive DIS Aram Kotzinian Torino University & INFN.

Measurements of chiral-odd fragmentation functions at Belle D. Gabbert (University of Illinois and RBRC) M. Grosse Perdekamp (University of Illinois and.

R. Joosten, Oct. 7, 2008 Measurement of TMDs in Semi-Inclusive DIS in Semi-Inclusive DIS Rainer Joosten University of Bonn Charlottesville, VA, October.

Drell-Yan pairs from pion scattering on longitudinally polarized nucleons COMPASS DY meeting, Torino, March Oleg Teryaev BLTP, JINR, Dubna.

1 Harut Avakian Studies on transverse spin effects at Jlab QCD Structure of the Nucleon June 12-16, 2006, Rome Physics motivation k T -effects from unpolarized.

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.

International Workshop on Transversity: New Developments in Nucleon Spin Structure June 2004 Color Gauge Invariance in Hard Processes Vrije Universiteit.

Possibility of direct extraction of the transversitiy from polarized Drell-Yan measurement in COMPASS Transversity Drell-Yan for transverstiy transverse.

1 Luciano Pappalardo Transversity at GPD 2008 ECT, Trento 12 June 2008.

1 Quarkonium Production at J-PARC Quarkonium Production at J-PARC with Unpolarized Proton Beam Quarkonium Production at J-PARC with Polarized Beam and.

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.

1 Beijing, July 2, 2008 Aram Kotzinian SIDIS asymmetries in Quark-Diquark model for Distribution Functions Aram Kotzinian CEA-Saclay, IRFU/Service de Physique.

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)

Experimental Studies of Spin Duality P. Bosted (JLab) Jlab Users Meeting, June 2005  Bloom-Gilman duality in inclusive g 1  Factorization in polarized.

1 CLAS-eg1 pol.-proton analysis H.Avakian (JLab) semi-SANE Collaboration Meeting April 21, 2005.

1 Hard scattering processes: Experiment N.C.R. Makins *) University of Illinois at Urbana-Champaign *) in collaboration with H. Avakian SIR Workshop –

1 Transversity Experiments Experimental probes for transversity Current experimental status on transversity and other related distribution and fragmentation.

International Committee for Spin Physics Symposia XIII WORKSHOP ON HIGH ENERGY SPIN PHYSICS Dubna, Russia September 1 - 5, 2009 AZIMUTHAL ASYMMETRIES IN.

Paul van der Nat (on behalf of the HERMES collaboration)

! how important for transverse spin studies

Unpolarized Azimuthal Asymmetries from the COMPASS Experiment

Measurements of quark transversity and orbital motion in hard scattering Yoshiyuki Miyachi Tokyo Institute of Technology.

Luciano Pappalardo for the collaboration

Fragmentation measurements in Belle and Babar and impact on RHIC

Experimental Study of Transversity

Prague 2007 Collins and Sivers asymmetries

New Results for Transverse Spin Effects at COMPASS

M. Contalbrigo (on behalf of HERMES collaboration)

on behalf of the COMPASS collaboration

Measurement of Transverse Spin Effects at COMPASS

Intrinsic transverse momentum and the Sivers effect #

Searching for intrinsic motion effects in SIDIS

Single Spin Asymmetry with a Transversely Polarized

Measurement of Transverse Spin Effects at COMPASS

Transverse Spin Physics at RHIC II

New Results on 0 Production at HERMES

Overview on hard exclusive production at HERMES

New results on SIDIS SSA from JLab

Belle Fragmentation activity

Paul van der Nat (on behalf of the HERMES collaboration)

Presentation transcript:

First results on two-hadron interference fragmentation on a transversely polarized hydrogen target Paul van der Nat (on behalf of the HERMES collaboration) Layout:Introduction Results on longitudinally polarized target Results on transversely polarized target Status of the analysis Conclusions & Outlook

November Tokyo Tech Introduction - 1  fragmentation Difficulties: extraction of difficult, needs weighting with Sivers & Collins entangled:

November Tokyo Tech Introduction - 2  fragmentation Integrate over : left with only Advantages: cross section asymmetry directly proportional to (no weigthing needed) (no weigthing needed) No Collins/Sivers “entanglement” Completely independent from 1  analysis Disadvantages: less statistics unknown (but can be measured at Belle & Babar) unknown (but can be measured at Belle & Babar)

November Tokyo Tech Interference FF Expansion of in Legendre moments: Jaffe et al. [hep-ph/ ]: Jaffe et al. [hep-ph/ ]: describe interference between 2 pion pairs coming from different production channels

November Tokyo Tech Interference FF Expansion of in Legendre moments: Radici et al. [hep-ph/ ]: Radici et al. [hep-ph/ ]: complety different model, not predicting complety different model, not predicting a sign change of the asymmetry around a sign change of the asymmetry around the (times -1 -> trento conventions) the (times -1 -> trento conventions) based on the spectator model based on the spectator model

November Tokyo Tech The polarized cross sections The A UL & A UT asymmetries are related to these polarized cross sections (subleading twist, Bacchetta et al.):

November Tokyo Tech before integration over Bacchetta et al. [hep-ph/ ]

November Tokyo Tech Single Spin Asymmetry What is measured: transversely polarized hydrogen target

November Tokyo Tech longitudinally polarized deuterium Hint of a sign change at the  0 mass!

November Tokyo Tech long. pol. deuterium, x-dependence higher x: hint of sign change at  0 mass according to Jaffe’s model  0 mass according to Jaffe’s model ?

November Tokyo Tech long. pol. deuterium, z-dependence sign change at  0 according to Jaffe’s model for low z Jaffe’s model for low z 2

November Tokyo Tech The A UT asymmetry Significant behavior! behavior!

November Tokyo Tech Invariant mass dependence positive asymmetry moments for all invariant mass bins for all invariant mass bins result rules out predicted sign change at the  0 mass sign change at the  0 mass (Jaffe et al.) (Jaffe et al.) Preliminary see f.i. M. Radici, hep-ph/

November Tokyo Tech Status of the analysis Dealing with low statistics: forced to integrate the asymmetry over many variables combined with the HERMES acceptance: watch out for combined with the HERMES acceptance: watch out for acceptance effects! acceptance effects! comparing different fitting methods for the extraction of the comparing different fitting methods for the extraction of the azimuthal moments: azimuthal moments: normal binned  2 fit versus unbinned max. likelihood fit normal binned  2 fit versus unbinned max. likelihood fit being studied using pythia MC data

November Tokyo Tech Conclusions & Outlook Conclusions: A (significantly) non-zero asymmetry-moment has been measured providing evidence for a non-zero interference fragmentation function. This also implies that interference fragmentation can be used to study transversity! The new results using a transversely polarized hydrogen target rule out the invariant mass behavior as predicted by R. Jaffe.Outlook: Increase the statistics using the 2005 data Extract asymmetry moment relating to Extract quantitative information on