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,

Slides:

Advertisements

Similar presentations

June 21, 2005 RHIC & AGS USER MEETING-SPIN 1 (Single) Transverse Spin Physics -- from DIS to hadron collider Feng Yuan, RBRC, Brookhaven National Laboratory.

Advertisements

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

Drell-Yan Experiments for determining Nucleon Partonic Structures Wen-Chen Chang Institute of Physics, Academia Sinica, Taiwan The International Symposium.

1 Partonic Substructure of Nucleons and Nuclei with Dimuon Production Partonic structures of the nucleons and nuclei with dimuon production –Overview and.

1 Probing the Light Quark Sea Flavor Asymmetry and Measuring the Neutron Transversity in Semi-inclusive Charged Meson Electroproduction Xin Qian Duke University.

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

NSTAR 2007Roelof Bijker, ICN-UNAM1 Flavor Asymmetry of the Nucleon Sea in an Unquenched Quark Model Introduction Degrees of freedom Unquenched quark model.

Parton Distributions at High x J. P. Chen, Jefferson Lab DNP Town Meeting, Rutgers, Jan , 2007  Introduction  Unpolarized Parton Distribution at.

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 NuTeV Anomaly & Strange-Antistrange Asymmetric Sea Bo-Qiang Ma Department of Physics, Peking University Department of Physics, Peking University August.

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

THE DEEP INELASTIC SCATTERING ON THE POLARIZED NUCLEONS AT EIC E.S.Timoshin, S.I.Timoshin.

Drell-Yan Perspectives at FAIR Marco Destefanis Università degli Studi di Torino Drell-Yan Scattering and the Structure of Hadrons Trento (Italy) May 21-25,

Argonne National Laboratory is managed by The University of Chicago for the U.S. Department of Energy Probing Hadronic Structure with Baryonic Probes –

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

Possibilities to perform DVCS measurement at COMPASS E. Burtin CEA-Saclay Irfu/SPhN On Behalf of the COMPASS Collaboration DIS Madrid - 29 April,

1 Probing the Nucleon Structure with Azimuthal Asymmetries --cos2φ distribution & Boer-Mulders F. Lingyan Zhu University of Illinois at Urbana-Champaign.

Spin-Flavor Decomposition J. P. Chen, Jefferson Lab PVSA Workshop, April 26-27, 2007, Brookhaven National Lab  Polarized Inclusive DIS,  u/u and  d/d.

Detector requirement form TMD working group J. P. Chen for the TMD working group June 5, 2010, EIC Detector Workshop, JLab TMD Program - A lot of enthusiasm,

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.

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

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

What pHe3 can teach us  Polarized He-3 is an effective neutron target  d-quark target  Polarized protons are an effective u-quark target 1 Therefore.

The Role of Higher Twists in Determining Polarized Parton Densities E. Leader (London), A. Sidorov (Dubna), D. Stamenov (Sofia) 10th International Workshop.

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.

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

1 Possible Additional Measurements in E906 Azimuthal angular distributions of Drell-Yan and J/ Ψ p+d/p+p ratios for J/ Ψ production Nuclear effects of.

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 Probing Spin and Flavor Structures of the Nucleon with Hadron Beams Flavor and spin structures of the nucleons –Overview and recent results Future prospects.

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

Physics to be explored by the un-polarized Drell-Yan program in COMPASS experiment Wen-Chen Chang Institute of Physics, Academia Sinica, Taiwan on behalf.

JPARC DY Workshop, April 7 Ralf Seidl (RBRC) R.Seidl: Transverse Spin 1RIKEN, April 7 In JPARC Drell Yan accessible with: UU(unpolarized beam, unpolarized.

1 Azimuthal dependence in unpolarized proton-induced Drell-Yan processes Mini-symposium on orbital motion of quarks in hard scattering 2 nd joint meeting.

HERMES によるパートン helicity 分布関数の QCD 解析 Tokyo Inst. of Tech. 1. Quantum Chromo-Dynamics (QCD) 2. Parton Helicity Distribution and Nucleon Spin Problem 3.

1 Qinghua Xu, (LBNL) EIC workshop, July 19, 206 Introduction Spin transfer of (anti)Lambda in pp collisions (anti)Lambda polarization in lp collisions.

Thomas Jefferson National Accelerator Facility PAC-25, January 17, 2004, 1 Baldin Sum Rule Hall C: E Q 2 -evolution of GDH integral Hall A: E94-010,

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.

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

Feb 13,2007Brookhaven National Lab1 Cos2φ Asymmetry in p+d/p+p Drell-Yan Lingyan Zhu University of Illinois at Urbana-Champaign FNAL E866/Nusea Collaboration.

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

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

High-energy hadron physics at J-PARC Wen-Chen Chang 章文箴 Institute of Physics, Academia Sinica, Taiwan KEK theory center workshop on Hadron physics with.

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

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

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

Future Drell-Yan program of the COMPASS cllaboration Norihiro DOSHITA (Yamagata University) On behalf of the COMPASS collaboration 2016/7/31N. Doshita.

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

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

Progress and opportunities of unpolarised Drell-Yan program Wen-Chen Chang Institute of Physics, Academia Sinica, Taiwan COMPASS beyond 2020 Workshop.

Flavor decomposition at LO

Hadron-structure studies at a neutrino factory

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

Luciano Pappalardo for the collaboration

Prague 2007 Collins and Sivers asymmetries

Semi-inclusive DIS at 12 GeV

Measurement of Transverse Spin Effects at COMPASS

Selected Physics Topics at the Electron-Ion-Collider

SINGLE HADRON TRANSVERSE SPIN ASYMMETRIES FROM COMPASS

Study of Strange Quark in the Nucleon with Neutrino Scattering

Large-X PDFs in the Drell-Yan Process

Measurement of Transverse Spin Effects at COMPASS

Spin Studies via Drell-Yan Process at PANDA

Probing Fragmentation Func. With SIDIS

Azimuthal dependence in unpolarized proton-induced Drell-Yan processes

New results on SIDIS SSA from JLab

Angular Distribution in Unpolarized Proton-induced Drell-Yan Process

Presentation transcript:

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, 2006 University of Illinois at Urbana-Champaign

2 Outline

3 Is in the proton? Test of the Gottfried Sum Rule New Muon Collaboration (NMC) obtains S G = ± ( Significantly lower than 1/3 ! ) =

4 Drell-Yan Measurements

5 Unpolarized Semi-Inclusive DIS Use SIDIS to extract parton distribution functions Universality of fragmentation functions (hep-ph/ )

6 Flavor structure of sea-quark distribution via SIDIS Assuming factorization is valid Require knowledge on the fragmentation function D’(z) SIDIS from HERMESDrell-Yan vs SIDIS

7 Future experiments to measure at large x

8 Future SIDIS for at small x ? HERMES: Semi-Inclusive DIS

9 Independent of nuclear effect in deuteron!

10 Garvey and Peng, nucl-ex/

11 Models for asymmetry Meson Cloud ModelsChiral-Quark Soliton ModelInstantons Quark degrees of freedom in a pion mean-field nucleon = chiral soliton expand in 1/Nc Theses models also have implications on asymmetry between and flavor structure of the polarized sea

12 Meson cloud model Signal and Thomas Brodsky and Ma Melnitchouk and Malheiro Christiansen and Magnin Analysis of neutrino DIS data Barone et al.

13 Result from NuTeV D. Mason, DIS 2005 talk s(x)s-bar(x)

14 Spin and flavor are closely connected Meson Cloud Model Pauli Blocking Model A spin-up valence quark would inhibit the probability of generating a spin-down antiquark Instanton Model Chiral-Quark Soliton Model Statistical Model

15 JCP, Eur. Phys. J. A18 (2003) 395

16 Flavor Structure of the Helicity Distributions No evidence for Measurement of W ± production at RHIC-spin would provide new information

17 Drell-Yan decay angular distributions Collins-Soper frame Θ and Φ are the decay polar and azimuthal angles of the μ + in the dilepton rest-frame A general expression for Drell-Yan decay angular distributions: In general :

18 Drell-Yan decay angular distributions Collins-Soper frame Θ and Φ are the decay polar and azimuthal angles of the μ + in the dilepton rest-frame A general expression for Drell-Yan decay angular distributions:

19 Decay angular distributions in pion-induced Drell-Yan Z. Phys. 37 (1988) 545 Dashed curves are from pQCD calculations NA10 π - +W

20 Decay angular distributions in pion-induced Drell-Yan Data from NA10 (Z. Phys. 37 (1988) 545) Is the Lam-Tung relation violated? 140 GeV/c194 GeV/c286 GeV/c

21 Boer-Mulders function h 1 ┴  1 =0.47, M C =2.3 GeV Boer, PRD 60 (1999)

22 Motivation for measuring decay angular distributions in p+p and p+d Drell-Yan No proton-induced Drell-Yan azimuthal decay angular distribution data Provide constraints on models explaining the pion-induced Drell-Yan data. (h 1 ┴ is expected to be small for sea quarks. The vacuum effects should be similar for p+N and π+N ) Test of the Lam-Tung relation in proton-induced Drell-Yan Compare the decay angular distribution of p+p versus p+d

23 E866 Preliminary <λ><λ>1.07± ±0.013 <ν><ν>0.03± ±0.07 p+d at 800 GeV/c Decay angular distributions for p+d Drell-Yan at 800 GeV/c

24 Comparison of NA10 versus E866 Sea-quark Boer-Mulders function is relatively small

25 Comparison of p+d versus p+p

26 Many Quark Distributions Are Probed in Semi-Inclusive DIS Unpolarized Polarized target Polarzied beam and target S L and S T : Target Polarizations; λe: Beam Polarization Sivers Transversity Boer-Mulders

27 for large x S = 0 dominance d/u→0 S Z = 0 dominance d/u→1/5 SU(6) symmetry d/u →1/2

28 Can one probe the meson cloud directly? Scattering of electron off virtual pion was studied at HERA by tagging forward-going proton/neutron Pion structure functions at < x < were measured

29 BONUS at Hall-B Tagging slow-moving spectator protons This setup is ideal for detecting the scattering off the meson cloud: a) ep→e’pX (π 0 cloud) b) ep→e’ΛX (K + cloud)

30 Connections between parton distribution functions and fragmentation functions

31

32 Ma, Schmidt, Soffer, Yang assumes the following relations between fragmentation function and parton distributions: CTEQ5 PDFBSB PDF (hep-ph/ ) Precise e + e - data at large z from Belle could shed light on the connection between PDF and fragmentation functions

33 Connection between PDF and FF for mesons? SMRS pion PDFKretzer pion fragmentation function

34 Connection between PDF and FF for mesons? Kretzer pion fragmentation function

35 Flavor structure of the fragmentation functions 1) Hyperons (Alberg et al. hep-ph/ ) Can be measured with Drell-Yan using Σ + beam. Difficult experiment! 2) Pions Σ + contains uus valence quarks X

36 Flavor structure of the fragmentation functions 3) Kaons Difficult to measure sea-quark distributions in K + !

37 What is known about kaon fragmentation functions? KKP global fit: This implies: Lingyan Zhu (PR ) Connections between the parton distribution and fragmentation functions?

38 Summary The flavor asymmetry of light sea quarks provides insight on nucleon sea. Future measurements of the sea quarks at higher and lower x and polarized sea are anticipated. Flavor and spin structure of the nucleon are connected. Complementarity between electron and hadron probes. Connection between the parton distribution function and the parton fragmentation functions need to be better understood. The flavor structure of nucleon and meson fragmentation functions could be an interesting area for further investigations.