1EIC-2004, March 17Aram Kotzinian Hyperon Physics and Target Fragmentation L polarization Transverse Longitudinal Single target spin asymmetries Collins.

Slides:

Advertisements

Similar presentations

12004, TorinoAram Kotzinian Outline Why L ? Transverse polarization of L Data Models Transversity Longitudinal polarization of L LEP data models Semi-inclusive.

Advertisements

1 Como, September 7, 2005 Aram Kotzinian Cahn and Sivers effects in the target fragmentation region of SIDIS Introduction Hadronization in SIDIS Cahn and.

Target Fragmentation studies at JLab M.Osipenko in collaboration with L. Trentadue and F. Ceccopieri, May 20,SIR2005, JLab, Newport News, VA CLAS Collaboration.

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

1SPIN2004, Trieste October, 2004 Aram Kotzinian LEPTO & Polarized SIDIS (polarized) SIDIS Independent fragmentation Purity method for polarized quark.

1 SSH05, BNL, June 2, 2005 Aram Kotzinian SSA in the target fragmentation region of SIDIS Cahn and Sivers effects Phenomenology & Data in the CFR Intrinsic.

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”,

 Transverse Polarization in STAR Au-Au Collisions Polarization definition and models E896 results STAR analysis STAR results Significance of results Future.

Simulations of Single-Spin Asymmetries from EIC Xin Qian Kellogg, Caltech EIC Meeting at CUA, July 29-31, TMD in SIDIS 2.Simulation of SIDIS.

1 Updates on Transversity Experiments and Interpretations Jen-Chieh Peng Transversity Collaboration Meeting, JLab, March 4, 2005 University of Illinois.

Pisa, INFN, October 21, 2003 Dmitry Naumov, LNP JINR Spin Physics in NOMAD OUTLINE 1.Spin Problem of the Proton … for Pedestrians.

, CCASTQinghua Xu, Shandong University1 Spin effects in fragmentation processes at RHIC Qinghua Xu ( 徐庆华 ) Physics department, Shandong University.

1 Flavor Symmetry of Parton Distributions and Fragmentation Functions Jen-Chieh Peng Workshop on “Future Prospects in QCD at High Energy” BNL, July 17-22,

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

Parton Model & Parton Dynamics Huan Z Huang Department of Physics and Astronomy University of California, Los Angeles Department of Engineering Physics.

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

Particle Physics Chris Parkes Experimental QCD Kinematics Deep Inelastic Scattering Structure Functions Observation of Partons Scaling Violations Jets.

Future Physics at JLab Andrew Puckett LANL medium energy physics internal review 12/14/

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.

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

1 E.C. Aschenauer Recent results from lepton proton scattering on the spin structure of the nucleon.

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

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

Luciano L. Pappalardo University of Ferrara Selected TMD results from HERMES L.L. Pappalardo – Baryons 2013 – Glasgow – June

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.

1 SPIN 2006, Kyoto, October 6, 2006 Aram Kotzinian Double spin azimuthal asymmetries A LT and A LL in semi-inclusive DIS Aram Kotzinian YerPhI, Armenia.

Spin transfer coefficient K LL’ in  photoproduction at HERMES D. Veretennikov On behalf of the HERMES collaboration DIS08, London.

Measurements with Polarized Hadrons T.-A. Shibata Tokyo Institute of Technology Aug 15, 2003 Lepton-Photon 2003.

SPIN STRUCTURE OF PROTON IN DYNAMICAL QUARK MODEL SPIN STRUCTURE OF PROTON IN DYNAMICAL QUARK MODEL G. Musulmanbekov JINR, Dubna, Russia

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

1 JLab, May 27, 2005 Aram Kotzinian Polarized Semi-Inclusive DIS in Current and Target Fragmentation Introduction The flavor separation of the quark helicity.

HERMES results on azimuthal modulations in the spin-independent SIDIS cross section Francesca Giordano DESY, Hamburg For the collaboration Madrid, DIS.

Measurement of Flavor Separated Quark Polarizations at HERMES Polina Kravchenko (DESY) for the collaboration  Motivation of this work  HERMES experiment.

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

TMD flavor decomposition at CLAS12 Patrizia Rossi - Laboratori Nazionali di Frascati, INFN  Introduction  Spin-orbit correlations in kaon production.

1 Madrid, April 27, 2009 Aram Kotzinian Longitudinal target polarization dependence of Λ polarization and polarized strangeness PDF Λ polarization Unpolarized.

Single-spin asymmetry in interference fragmentation on a transversely polarized hydrogen target at HERMES Tomohiro Kobayashi Tokyo Institute of Technology.

1 Dubna, September, 2005 Aram Kotzinian Spin effects in MC generators The spin and azimuthal asymmetries in the current and target fragmentation regions.

1 Transversity 2011, Lošinj, August 30, 2011 Aram Kotzinian Correlations between SIDIS azimuthal asymmetries in target and current fragmentation regions.

Tensor and Flavor-singlet Axial Charges and Their Scale Dependencies Hanxin He China Institute of Atomic Energy.

The transverse structure of the nucleon (resolving the quark motion inside a nucleon) Mauro Anselmino, Torino University and INFN, JLab, December 15, 2006.

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

New results from Delia Hasch DPG Spring Meeting 2004 – Nuclear Physics Cologne (Germany) March, (on behalf of the HERMES Collaboration) Exotic.

GPD and underlying spin structure of the Nucleon M. Wakamatsu and H. Tsujimoto (Osaka Univ.) 1. Introduction Still unsolved fundamental puzzle in hadron.

1 DIS 2007, Munich, April 19, 2007 Aram Kotzinian Beyond Collins and Sivers: further measurements of the target transverse spin-dependent azimuthal asymmetries.

A sideways look into the proton Transverse momentum and transverse spin in QCD Alessandro Bacchetta.

Transversity (transverse spin and transverse motion)

Flavor decomposition at LO

Unpolarized Azimuthal Asymmetries from the COMPASS Experiment

Long-range plan of nuclear physics in Japan

(Anti)Lambda polarization in SIDIS

Polarization phenomena in the target fragmentation region of SIDIS

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

Luciano Pappalardo for the collaboration

Semi-inclusive DIS at 12 GeV

Unique Description for SSAs in DIS and Hadronic Collisions

Selected Physics Topics at the Electron-Ion-Collider

Intrinsic transverse momentum and the Sivers effect #

B2B hadron production in SIDIS

The transverse spin structure of the nucleon

Quark and Gluon Sivers Functions

Searching for intrinsic motion effects in SIDIS

Unique Description for Single Transverse Spin Asymmetries

New Results on 0 Production at HERMES

Spin effects and partonic intrinsic k┴

SSA in the target fragmentation region of SIDIS

Sangem Rajesh in collaboration with Asmita Mukherjee IIT Bombay, India

6th European Research Conference September 21-24, Milos, Greece

The Helicity Structure of the Nucleon from Lepton Nucleon Scattering

Presentation transcript:

1EIC-2004, March 17Aram Kotzinian Hyperon Physics and Target Fragmentation L polarization Transverse Longitudinal Single target spin asymmetries Collins effect Sivers effect Aram Kotzinian Torino University & INFN On leave in absence from YerPhI, Armenia and JINR, Russia

2EIC-2004, March 17Aram Kotzinian SIDIS

3EIC-2004, March 17Aram Kotzinian Large branching ratio in the charged hadron channel: Unique tool for polarization study due to self-analyzing parity violating weak decay Simple spin structure in the naïve quark model: (ud)-diquark is a spin and isospin singlet (s)-quark carries whole spin of L Why L? P In the L rest frame

4EIC-2004, March 17Aram Kotzinian Transverse Polarization of L in pp/A reactions z Normal to production plane Empiric relation: L n x P

5EIC-2004, March 17Aram Kotzinian Models for Transverse Polarization DeGrand & Miettinen model (1981) Quark recombination Anderson, Gustafson & Ingelman (1979) String fragmentation Barni, Preparata & Ratcliffe (1992) Diffractive triple-Regge model Anselmino, Boer, D’Alesio & Murgia (2001) New polarizing Fragmentation Functions

6EIC-2004, March 17Aram Kotzinian De Grand & Miettinen model An empirical rule for spin direction of recombining quark: Slow partons – Down (L), fast partons – Up SU(6) wave functions for baryons Semiclassical dynamic is based on Thomas precession New term in effective interaction Hamiltonian, where Thomas frequency is fast partons – Up

7EIC-2004, March 17Aram Kotzinian Anderson, Gustafson & Ingelman model Semiclassical string fragmentation model Vacuum quantum numbers of quark-antiquark pair: -state Normal to production plane – out of picture -pair orbital moment is compensated by spin Negative transverse polarization of L

8EIC-2004, March 17Aram Kotzinian Interference between diagrams with different intermediate baryons give rise to polarization Barni, Preparata & Ratcliffe

9EIC-2004, March 17Aram Kotzinian Polarizing Fragmentation Functions In unpolarized quark fragmentation with nonzero transverse momentum,, L can be transversely polarized L n Probabilistic interpretation – no interference effects

10EIC-2004, March 17Aram Kotzinian Some Open Questions No transverse polarization observed at LEP Positive transverse polarization at HERMES Qualitatively can be explained in DM model with VMD approach Parton model: u-quark dominance? Compare with neutrino data.

11EIC-2004, March 17Aram Kotzinian TFR of SIDIS Trentadue & Veneziano: fracture function – probability of finding a parton q with momentum fraction x and a hadron h with the CMS energy fraction in the proton.

12EIC-2004, March 17Aram Kotzinian Melnitchouk & Thomas: 100 % anticorrelated with target polarization contradiction with neutrino data for unpolarized target Longitudinal polarization of L in the TFR in neutrino SIDIS Meson Cloud Model

13EIC-2004, March 17Aram Kotzinian Karliner, Kharzeev, Sapozhnikov, Alberg, Ellis & A.K. nucleon wave function contains an admixture with component: π,K masses are small at the typical hadronic mass scale ⇒ a strong attraction in the − channel. pairs from vacuum in state Intrinsic Strangeness Model Polarized proton: Spin crisis:

14EIC-2004, March 17Aram Kotzinian Ed. Berger criterion The typical hadronic correlation length in rapidity is Illustrations from P. Mulders: HERMES: 4 GeV; COMPASS: 11 GeV; EIC(5+50, y>0.4): 24GeV

15EIC-2004, March 17Aram Kotzinian L production in 500 GeV/c π−-Nucleon Production Fermilab E791 Collaboration, hep-ph/ Significant target influence in the projectile fragmentation region

16EIC-2004, March 17Aram Kotzinian qqq  Rank from diquark Rank from quark Tagging scheme for a hyperon which contains: Struck quarkRemnant diquark R q =1 (A) R q  1 & Rqq  1 (B) R qq =1 (A) R qq  1 & Rq  1 (B) NOMAD (43.8 GeV)COMPASS (160 GeV) No clean separation of the quark and diquark fragmentation

17EIC-2004, March 17Aram Kotzinian J.Ellis, A.K. & D.Naumov (2002)

18EIC-2004, March 17Aram Kotzinian Λ polarization in quark & diquark fragmentation Λ polarization from the diquark fragmentation Λ polarization from the quark fragmentation I – nonrelativistic SU(6) wave functions II – flavor SU(3) & polarized DIS data for baryon octet:

19EIC-2004, March 17Aram Kotzinian Spin Transfer We use Lund string fragmentation model incorporated in LEPTO6.5.1 and JETSET7.4. We consider two extreme cases when polarization transfer is nonzero: model A: the hyperon contains the stuck quark: Rq = 1 the hyperon contains the remnant diquark: Rqq = 1 model B: the hyperon originates from the stuck quark: Rq ≥ 1 the hyperon originates from the remnant diquark: Rqq ≥ 1

20EIC-2004, March 17Aram Kotzinian Fixing free parameters We vary two correlation coefficients ( and ) in order to fit our models A and B to the NOMAD Λ polarization data. We fit to the following 4 NOMAD points to find our free parameters:

21EIC-2004, March 17Aram Kotzinian Results

22EIC-2004, March 17Aram Kotzinian Predictions for COMPASS

23EIC-2004, March 17Aram Kotzinian Predictions for EIC 5 GeV/c electron + 50 GeV/c proton, Good separation of the quark and diquark fragmentation allows to distinguish between different spin transfer mechanisms in the quark fragmentation

24EIC-2004, March 17Aram Kotzinian Collins Effect Front view Side view azimuthal modulation of transversely polarized quark FF Up-Down asymmetry = 0 Nonzero Left-Right asymmetry Schaefer-Teryaev SR: hadrons transverse momenta are compensated in the quark fragmentation

25EIC-2004, March 17Aram Kotzinian Sivers Effect Azimuthal modulation of quark transverse momentum for a transversely polarized nucleon Unpolarized DF: Polarized DF: Quark transverse momentum is compensated by that of diquark One can incorporate into LEPTO MC SIDIS event generator

26EIC-2004, March 17Aram Kotzinian SSA Analyzing power: Only Sivers effect Only Collins effect Analysis by Anselmino et al, E704 STAR

27EIC-2004, March 17Aram Kotzinian Open points – HERMES data Filled points – MC, only Sivers Only Collins HERMES SSA

28EIC-2004, March 17Aram Kotzinian Anselmino et al for E704 SSA Test parameterization: opposite sign & high values at small x Parameterization for

29EIC-2004, March 17Aram Kotzinian Modified LEPTO MC predictions for EIC SSA Opposite signs of asymmetry in the target and current fragmentation E704 SSA – diquark fragmentation ?

30EIC-2004, March 17Aram Kotzinian Modified LEPTO MC predictions for EIC SSA Opposite signs of asymmetry in the target and current fragmentation In principle, one can check origin of by measuring it in the TFR

31EIC-2004, March 17Aram Kotzinian Conclusions We have no well developed QCD framework to describe hadron (hyperon) production and polarization in the TFR EIC will allow To distinguish between different models of L polarization (both longitudinal and transverse) To check the target independence of spontaneous L transverse polarization in the TFR (proton scattering on virtual photon) To investigate the azimuthal SSA in the TFR Sivers effect Collins effect from target remnant (diquark) hadronization?