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

Slides:



Advertisements
Similar presentations
Fisica dello Spin27 Settembre 2005, Otranto1 Surprises: Transverse Single Spin Asymmetries (unintegrated polarized parton distributions) Single Spin Asymmetries.
Advertisements

Mauro Anselmino, Como, September 7, 2005 Transversity Transversity (transverse spin and transverse motion) Towards transversity distributions: theory.
December 17, 2004 JLab Hall A Upgrade 1 Semi-Inclusive DIS --opportunities at JLab upgrade Feng Yuan RBRC, Brookhaven National Laboratory.
1 Transversity Physics Update Jen-Chieh Peng Polarized 3 He and Tansversity Collaboration Meeting, JLab, October 21-22, 2005 University of Illinois at.
1 New target transverse spin dependent azimuthal asymmetries from COMPASS experiment Bakur Parsamyan INFN & University of Turin on behalf of the COMPASS.
April 06, 2005 JLab 12 GeV upgrade DOE Science Review 1 Fundamental Structure of Hadrons Zein-Eddine Meziani April 06, 2005 DOE Science Review for JLab.
Target Fragmentation studies at JLab M.Osipenko in collaboration with L. Trentadue and F. Ceccopieri, May 20,SIR2005, JLab, Newport News, VA CLAS Collaboration.
Transversity and Transverse-Momentum-Dependent Partonic Functions Alessandro Bacchetta.
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.
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”,
Working Group on e-p Physics A. Bruell, E. Sichtermann, W. Vogelsang, C. Weiss Antje Bruell, JLab EIC meeting, Hampton, May Goals of this parallel.
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.
9/19/20151 Semi-inclusive DIS: factorization Feng Yuan Lawrence Berkeley National Laboratory RBRC, Brookhaven National Laboratory.
Overview on Transverse Momentum Dependent Distribution and Fragmentation Functions M. Boglione.
Spin Azimuthal Asymmetries in Semi-Inclusive DIS at JLAB  Nucleon spin & transverse momentum of partons  Transverse-momentum dependent distributions.
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.
The future COMPASS-II Drell-Yan program M. Alexeev INFN sez. di Torino. On behalf of the COMPASS 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.
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.
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.
R. Joosten, Oct. 7, 2008 Measurement of TMDs in Semi-Inclusive DIS in Semi-Inclusive DIS Rainer Joosten University of Bonn Charlottesville, VA, October.
Measurements with Polarized Hadrons T.-A. Shibata Tokyo Institute of Technology Aug 15, 2003 Lepton-Photon 2003.
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.
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.
1 Madrid, April 27, 2009 Aram Kotzinian Longitudinal target polarization dependence of Λ polarization and polarized strangeness PDF Λ polarization Unpolarized.
1EIC-2004, March 17Aram Kotzinian Hyperon Physics and Target Fragmentation L polarization Transverse Longitudinal Single target spin asymmetries Collins.
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.
R. Joosten, Oct. 7, 2008 Measurement of TMDs in Semi-Inclusive DIS in Semi-Inclusive DIS Rainer Joosten University of Bonn Charlottesville, VA, October.
1 DIS 2007, Munich, April 19, 2007 Aram Kotzinian Beyond Collins and Sivers: further measurements of the target transverse spin-dependent azimuthal asymmetries.
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.
Transversity (transverse spin and transverse motion)
Flavor decomposition at LO
Unpolarized Azimuthal Asymmetries from the COMPASS Experiment
(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
Experimental Study of Transversity
Prague 2007 Collins and Sivers asymmetries
Semi-inclusive DIS at 12 GeV
on behalf of the COMPASS collaboration
Unique Description for SSAs in DIS and Hadronic Collisions
Selected Physics Topics at the Electron-Ion-Collider
Intrinsic transverse momentum and the Sivers effect #
The transverse spin structure of the nucleon
Quark and Gluon Sivers Functions
Searching for intrinsic motion effects in SIDIS
University of Erlangen-Nürnberg & DESY
Unique Description for Single Transverse Spin Asymmetries
Single Spin Asymmetry with a Transversely Polarized
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
3D structure of the nucleon and Transverse single-spin asymmetries
The Helicity Structure of the Nucleon from Lepton Nucleon Scattering
Presentation transcript:

1 Como, September 7, 2005 Aram Kotzinian Cahn and Sivers effects in the target fragmentation region of SIDIS Introduction Hadronization in SIDIS Cahn and Sivers asymmetries in the current fragmentation regions Cahn and Sivers asymmetries in LEPTO Discussion & Conclusions Aram Kotzinian Torino University & INFN On leave in absence from YerPhI, Armenia and JINR, Russia hep-ph/

2 Como, September 7, 2005 Aram Kotzinian SIDIS in LO QCD: CFR Well classified correlations in TMD distr. and fragm. functions Sivers distribution Boer distribution Helicity distribution Collins effect in quark fragmentation N q q h p Mulders distribution

3 Como, September 7, 2005 Aram Kotzinian Cahn effect in CFR Quadratic in M.Anselmino, M.Boglione, U.DAlesio, A.K., F.Murgia and A.Prokudin: PRD 71, (2005); Linear in and proportional to Azimuthal modulation of lepton-quark hard scattering cross section in unpolarized SIDIS

4 Como, September 7, 2005 Aram Kotzinian Sivers Effect in CFR Azimuthal modulation of quark transverse momentum in a transversely polarized nucleon M.Anselmino, M.Boglione, U.DAlesio, A.K., F.Murgia and A.Prokudin: PRD 71, (2005); hep-ph/ Parameters were extracted from combined analysis of HERMES and COMPASS data (details in the talk of A. Prokudin)

5 Como, September 7, 2005 Aram Kotzinian Ed. Berger criterion (separation of CFR &TFR) The typical hadronic correlation length in rapidity is Illustrations from P. Mulders:

6 Como, September 7, 2005 Aram Kotzinian SIDIS in LO QCD: TFR N q h 1994: Trentadue & Veneziano; Graudenz; … Fracture functions: conditional probability of finding a parton q with momentum fraction x and a hadron h with the CMS energy fraction z More correlations for TMD dependent FracFuncs

7 Como, September 7, 2005 Aram Kotzinian SIDIS Event Generators and LUND String Fragmentation Soft Strong Interaction qq q Rank from diquark Rank from quark h Parton DF, hard X-section & Hadronization are factorized Implemented in PHYTIA and LEPTO + JETSET (hadronization)

8 Como, September 7, 2005 Aram Kotzinian Quark k T in MC generators PYTHIA and LEPTO - Generate virtual photon – quark scattering in collinear configuration: - Before - After hard scattering - Rotate in l-l plane - Generate intrinsic transverse momentum of quark (Gaussian k T ) - Generate uniform azimuthal distribution of quark (flat by default) - Rotate around virtual photon

9 Como, September 7, 2005 Aram Kotzinian Sivers effect in pp l + l - + X One class of nonperturbative input: only distribution functions, no hadronization effects are present Modify PYTHIA to include Sivers effect: azimuthal correlations of the parton transverse momentum and transverse spin on nucleon in distribution functions STST

10 Como, September 7, 2005 Aram Kotzinian Sivers effect in pp l + l - + X Similar values as in Anselmino et al: hep-ph/

11 Como, September 7, 2005 Aram Kotzinian Implementing Cahn and Sivers effects in LEPTO The common feature of Cahn and Sivers effects Unpolarized initial and final quarks Fragmenting quark-target remnant system is similar to that in default LEPTO but the direction of is now modulated Cahn: Sivers: Generate the final quark azimuth according to above distributions

12 Como, September 7, 2005 Aram Kotzinian Results: Cahn Imbalance of measured in TFR and CFR: neutrals? Charged hadrons azimuth EMC Collaboration (280GeV)

13 Como, September 7, 2005 Aram Kotzinian Results: Sivers Predictions for x F -dependence at JLab 12 GeV Red triangles with error bars – projected statistical accuracy for 1000h data taking (H.Avagyan). z, x Bj and P T dependences

14 Como, September 7, 2005 Aram Kotzinian Results: Sivers JLab 12 GeV

15 Como, September 7, 2005 Aram Kotzinian Bjorken variable dependence of FFs in LEPTO The dependence of FFs on x cannot be attributed to Q 2 evolution

16 Como, September 7, 2005 Aram Kotzinian Dependence on target remnant spin state (unpolarized LEPTO) Example: valence u-quark is removed from proton. Default LEPTO: the remnant (ud) diquark is in 75% (25%) of cases scalar (vector) Even in unpolarized LEPTO there is a dependence on target remnant spin state (ud) 0 : first rank Λ is possible (ud) 1 : first rank Λ is impossible

17 Como, September 7, 2005 Aram Kotzinian Target remnant in Polarized SIDIS JETSET is based on SU(6) quark-diquark model Probabilities of different string spin configurations depend on quark and target polarizations, target type and process type 90% scalar 100% vector

18 Como, September 7, 2005 Aram Kotzinian Polarized SIDIS & HF In contrast with FFs, HFs in addition to z depend on x and target type and on struck quark and target polarization: are the spin dependent cross section and HFs and double spin effect (struck quark & target), as in DFs. Spin dependence of hadronization: A.K. (hep-ph/ , EPJ C, 2005)

19 Como, September 7, 2005 Aram Kotzinian Asymmetries The standard LO expression for helicity asymmetry of SIDIS is obtained when and For TMD dependent HFs the new spin-azimuth correlations depending on both transverse momentum of quark in nucleon and final hadron are possible: Unpolarized lepton, long. polarized target Unpolarized target, long. polarized lepton Unpolarized lepton, trans. polarized target

20 Como, September 7, 2005 Aram Kotzinian Conclusions Hadronization functions provide a general description of SIDIS in the whole kinematics of hadrons Both Cahn and Sivers effects are implemented in LEPTO. Possible polarization effects in hadronization were neglected. Existing data in the CFR are well described by modified LEPTO The measured Cahn effect in the TFR is not well described It is important to perform new measurements of Cahn, Sivers and other azimuthal asymmetries in the TFR (JLab, HERMES, Electron Ion Colliders) This will help better understand spin dynamics in hadronization: Do neutral hadrons compensate the Cahn effect in CFR? Are there asymmetries present in TFR that compensate the Sivers effect in CFR? Do there exist any other spin-dependent azimuthal asymmetries in TFR? The access to TFR opens a new field both for theoretical and experimental investigations

21 Como, September 7, 2005 Aram Kotzinian additional slides

22 Como, September 7, 2005 Aram Kotzinian MC tuning Monte Carlo: Lepto in combination with JETSET; PDF: CTEQ-6L Fragmentation parameters tuned to HERMES multiplicities in the acceptance Data: Q 2 >1GeV 2, W 2 >10GeV 2, z>0.2, 2GeV <p< 15GeV (, K, and P) Excellent Agreement even at the cross section level DATA/MC <10%! P+P+P+P+ P-P-P-P-

23 Como, September 7, 2005 Aram Kotzinian HERMES check x F ? x F > 0.1