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

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Presentation transcript:

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

Quantum Chromodynamics QCD: Field Theory of strong interaction in matter SU flavor (3) X SU color (3) Confinement: No free quarks, gluons (so-called partons) Color singlet Hadrons: meson baryon

Scattering Process

Momentum Scale and Position Resolution P  x > hc ~ 200 MeV fm

Rutherford Hofstadter SLAC FNAL CERN HERA Discoveries New Machine and Energy Frontier  Discovery

Exploring nuclear structure - elastic electron-nucleus scattering l Scattering of electron (Spin 1/2) on point- charge charge (Spin 0): Mott cross-section l Take into account finite charge distribution: Form factor Ignore recoil! 12 C Hofstadter, 1953

Form Factors

Experimental Data

Charge Distribution Data from Electron Scatterings! How do we measure the neutron distribution?

Parton Scattering and Bjorken Limit Q 2 = -q 2 Bjorken Limit: Q 2,  infinite, 2 >> Q 2 >>  2   Q 2 /(2M ) = x J

fraction of the proton momentum carried by the charged parton fraction of the electron energy carried by the virtual photon (  inelasticity  ) (mass) 2 of  * p system center of mass energy of ep system (momentum transfer) 2 virtuality of  *, Z 0, W   (  size  of the probe) -1 Kinematic Variables

Exploring the Proton structure - inelastic ep scattering Friedman, Kendall and Taylor l Scattering of electron (Spin 1/2) on proton (Spin 1/2) Deep-inelastic scattering (DIS) Nobel Prize 1990 Scattering on pointlike objects: Quarks!

Structure Functions Structure function measurement: Formalism –In terms of laboratory variables: –Formulate this now in relativistic invariant quantities: –Instead of W 1 and W 2, use: F 1 and F 2 : Longitudinal structure function: F L

Parton Model Interpretation of F 2 ) Isospin Symmetry

F 2 Measurements (small) Neutrino Scattering

Sketch of Structure Function

Scaling Region ! Experimental Data

From Experimental Measurement to Parton Distribution Function Model Dependent Result !

Structure Function as a Function of x and Q 2

Quark Structure Functions Sea Quarks Dominate Z d 2 /Z u 2 ~ 1/4 u quark in p d quark in n dominate ?

Total Momentum in Quarks Momentum Carried by u, d quarks: Proton: uud Quarks carry ~50% of the momentum Gluons ~ 50%

Interest in the low x Region

Saturation Region Gluon pile up at fixed size until gluons with strength act like a hard sphere Once one size scale is filled Move to smaller size scale Typical momentum scale grows

Saturation in the Parton PDF Saturation: Low x region Scale Q 2 ~ GeV 2 Saturation: The saturation scale changes in nuclei ~ A 1/3

EMC Effect

Gluon EMC Effect Not measured well in electron or muon scattering experiments ! Why? How to improve the gluon measurement?

Experimental Measurement from lepton Scattering on Polarized Target

Fit Experimental Data for Spin Structure Functions u + d – sea – gluon ?

Gluon 2 = 1.0 GeV 2 Result Model-Dependent !

Spin Physics Program The Spin Structure of the Proton: ½ = ½   q +  G + q  up, down and strange quarks G  gluons L  angular momentum of quarks and gluons Experimentally: 1) total spin in quarks ~ 30% 2) sea quarks are polarized too 3) little info about the gluon polarization 4) even less know about and how to measure

RHIC Spin Physics At RHIC we use polarized p+p collisions to study 1)Gluon spin structure function q+g  q+  2)Sea quark spin structure function q+q  W boson 3)Quark transverse spin distribution Essential to measure photons, electrons and jets ! STAR: TPC and Electromagnetic Calorimeter- Lead/Plastic Scintillator sandwich, Shower Max Detector for electron/hadron separation.

Meson Spectroscopy

Baryon Spectroscopy

Where Does the Mass Come From?

QCD Masses Dominate !! Proton Mass ~ 940 MeV three quarks uud each quark ~ 300 MeV Pion two quarks: Mass ~ 140 MeV, spin=0 Rho meson (same quark content as pion): Mass ~ 776 MeV Very large component of the mass from Interactions The Interaction energy strongly spin-dependent !

Proton Wave Function

Proton and Neutron Wave Functions

Magnetic Moments

Exp ~

Magnetic Moments of Baryons

The END