Burkert talk

Information about Burkert talk

Published on October 15, 2007

Author: Freedom

Source: authorstream.com

Content

Slide1:  Generalized Parton Distributions and Nucleon Structure Volker D. Burkert Jefferson Lab DOE Science Review for the JLab Upgrade to 12 GeV, Jefferson Lab, April 6-8, 2005 GPDs - a unifying framework of hadron structure DVCS and DVMP at 12 GeV Extracting GPDs from polarization measurements 3D Imaging of the Nucleon Quark Structure Transverse momentum dependent PDFs A five year program with CLAS12 Summary With pQCD established we have the tool to understand matter at a deeper level. Nobel prize 2004 - D. Gross, D. Politzer, F. Wilzcek Slide2:  Fundamental questions in hadron physics? 1950-1960: Does the proton have finite size and structure? Elastic electron-proton scattering the proton is not a point-like particle but has finite size charge and current distribution in the proton, GE/GM Nobel prize 1961- R. Hofstadter Deeply inelastic scattering discover quarks in ‘scaling’ of structure function and measure their momentum and spin distributions 1960-1990: What are the internal constituents of the nucleon? Nobel prize 1990 - J. Friedman, H. Kendall, R. Taylor Today: How are the nucleon’s charge & current distributions related to the quark momentum & spin distributions? Slide3:  Beyond form factors and quark distributions – Generalized Parton Distributions (GPDs) Proton form factors, transverse charge & current densities M. Burkardt, … Interpretation in impact parameter space Slide4:  From Holography to Tomography detector A Proton By varying the energy and momentum transfer to the proton we probe its interior and generate tomographic images of the proton (“femto tomography”). Slide5:  GPDs & Deeply Virtual Exclusive Processes x Deeply Virtual Compton Scattering (DVCS) t x+x x-x 2x – longitudinal momentum transfer x – longitudinal quark momentum fraction g “handbag” mechanism xB 2-xB x = Slide6:  Link to DIS and Elastic Form Factors Slide7:  A Unified Description of Hadron Structure Parton momentum distributions Elastic form factors Real Compton scattering at high t Deeply Virtual Meson production Deeply Virtual Compton Scattering GPDs Slide8:  e-’ f Qgg* p g e- y x z g* plane ee’g* plane DVCS – Kinematics gg*p fs S ALU : Beam Longitudinally polarized, Target Unpolarized AUL : Beam Unpolarized, Target Longitudinally polarized AUT : Beam Unpolarized, Target Transversely polarized ep epg Slide9:  Accessing GPDs through DVCS DVCS BH Eo = 11 GeV Eo = 6 GeV Eo = 4 GeV BH DVCS DVCS/BH comparable, allows asymmetry, cross section measurements GPDs are universal, they can be determined in any suitable process TBH : given by elastic form factors TDVCS: determined by GPDs BH-DVCS interference generates beam and target asymmetries that carry the nucleon structure information. ALU ~ (BH) Im(DVCS) sinf + h.t. Slide10:  Measuring GPDs through polarization Slide11:  Access GPDs through x-section & asymmetries DIS measures at x=0 Slide12:  DVCS interpreted in pQCD at Q2 > 1 GeV2 Pioneering DVCS experiments Full GPD analysis needs high statistics and broad coverage twist-3 twist-2 twist-3 contributions are small Slide13:  Deeply Virtual Exclusive Processes - Kinematics Coverage of the 12 GeV Upgrade JLab Upgrade Slide14:  DVCS/BH- Beam Asymmetry With large acceptance, measure large Q2, xB, t ranges simultaneously. A(Q2,xB,t) Ds(Q2,xB,t) s (Q2,xB,t) Ee = 11 GeV ALU Slide15:  CLAS12 - DVCS/BH- Beam Asymmetry Ee = 11 GeV Slide16:  CLAS12 - DVCS/BH Beam Asymmetry E = 11 GeV Selected Kinematics Sensitive to GPD H DsLU~sinfIm{F1H+..}df Slide17:  CLAS12 - DVCS/BH Target Asymmetry <Q2> = 2.0GeV2 <x> = 0.2 <-t> = 0.25GeV2 CLAS preliminary E=5.75 GeV AUL Longitudinally polarized target Ds~sinfIm{F1H+x(F1+F2)H...}df ~ Slide18:  CLAS12 - DVCS/BH Target Asymmetry Transverse polarized target Ds ~ sinfIm{k1(F2H – F1E) +…}df AUTx Target polarized in scattering plane AUTy Target polarized perpedicular to scattering plane Slide19:  From Observables to GPDs Procedures to extract GPDs from experimental data are currently under intense development. Fit parametrizations of GPDs to large sets of DVCS/DVMP cross section and SSA data. Constraint by “forward” parton distribution Polynomiality conditions Elastic form factors Meson distribution amplitudes Approximations for certain kinematics (small x, t), allow extraction of dominant GPDs directly. Partial wave expansion techniques. GPDs are given by sum over t-channel exchanges See: talk by M. Vanderhaeghen Slide20:  GPDs H from expected DVCS ALU data Slide21:  DVCS DVMP GPDs – Flavor separation hard vertices hard gluon Photons cannot separate u/d quark contributions. long. only M = r/w select H, E, for u/d flavors M = p, h, K select H, E Slide22:  xB=0.38 CLAS (4.3 GeV) Q2 (GeV2) Exclusive ep epr0 production L Slide23:  CLAS12 – L/T Separation ep epro (p+p-) Projections for 11 GeV (sample kinematics) Slide24:  Exclusive r0 production on transverse target 2D (Im(AB*))/p T |A|2(1-x2) - |B|2(x2+t/4m2) - Re(AB*)2x2 AUT = - Asymmetry depends linearly on the GPD E, which enters Ji’s sum rule. A ~ 2Hu + Hd B ~ 2Eu + Ed r0 K. Goeke, M.V. Polyakov, M. Vanderhaeghen, 2001 A ~ Hu - Hd B ~ Eu - Ed r+ CLAS12 Slide25:  transverse polarized target 3D Images of the Proton’s Quark Content M. Burkardt PRD 66, 114005 (2002) Accessed in Single Spin Asymmetries. Slide26:  PDFs fpu(x), g1, h1 Transverse Momentum Dependent GPDs (TMDs) SIDIS at leading twist:  SIDIS at leading twist e e e p p Sivers transversity Mulders Boer Off-diagonal PDFs vanish if quarks only in s-state! In addition T-odd PDFs require FSI (Brodsky et al., Collins, Ji et al. 2002) Slide28:  Semi-Inclusive Deep Inelastic Scattering (SIDIS) Give access to quark distributions weighted by fragmentation function Probes orbital motion of quarks through quark transverse momentum distribution Access to new PFDs not accessible in inclusive DIS. parton distributions at large x (Z.E. Meziani) orbital angular momentum of quarks through SSA in inclusive meson production. Main focus of SIDIS studies: Slide29:  Originates in the quark distribution. It is measured in the azimuthal asymmetry with transverse polarized target. Requires: non-trivial phase from the FSI + interference between different helicity states (S. Brodsky) Azimuthal Asymmetry – Sivers Effect f1T D1 AUT ~ k sin(f-fs) T SIDIS Azimuthal Asymmetry - Sivers effect :  SIDIS Azimuthal Asymmetry - Sivers effect Extraction of Sivers function f1T from asymmetry. Probes orbital angular momentum of quarks by measuring the imaginary part of s-p-wave interference in the amplitude. T CLAS12 - Sivers function from AUT (p0) :  CLAS12 - Sivers function from AUT (p0) Sivers function extraction from AUT (p0) does not require information on fragmentation function. It is free of HT and diffractive contributions. F1T=1/2∑qeq2f1T┴q AUT (p0) on proton and neutron will allow flavor decomposition w/o info on FF. In large Nc limit: f1Tu = -f1Td Efremov et al (large xB behavior of f1T from GPD E) xB xB CLAS12 projected CLAS12 projected Azimuthal Asymmetry - Collins Effect :  Azimuthal Asymmetry - Collins Effect Access to transversity distribution and fragmentation of polarized quarks. Collins Effect and Kotzinian-Mulders Asymmetry :  Collins Effect and Kotzinian-Mulders Asymmetry Measures the Collins fragmentation with longitudinally polarized target. Access to the real part of s-p wave interference amplitudes. Slide34:  What can be achieved in the first five years? Precision measurements of DVCS/BH and DVMP, beam asymmetry, target asymmetries, and cross section differences in kinematics Q2 = 1.5 - 7.0 GeV2, xB = 0.1 - 0.6, -t = 0.1-1.5 GeV2 Precision measurements of beam and target asymmetries for p+,p-,p0 in current fragmentation region and SIDIS kinematics Determine GPDs H(x,x,t), H(x,x,t), E(x,x,t) Flavor separated Eu/d, Hu/d from r0, r+ production Probe the orbital motion of quarks in the nucleon through spin asymmetries. Precision measurement of the Sivers distribution function. Determine transversity in a variety of channels. Confront moments of GPDs with Lattice QCD calculations Slide35:  CLAS12 “The CLAS upgrade is essential to the physics mission of the 12 GeV Upgrade.” (PAC27, January 2005) Large angle coverage, High luminosity, 1035 cm-2s-1 Concurrent measurement of deeply virtual exclusive, semi-inclusive, and inclusive processes, for same target, polarized or unpolarized. Slide36:  A program to study the nucleon Generalized Parton Distributions has been developed for the CEBAF 12 GeV upgrade covering a broad range of kinematics and reactions. This program will provide fundamentally new insights into the internal quark dynamics through the measurement of polarization observables of exclusive and semi-inclusive deep inelastic processes. It will determine: quark orbital angular momentum contributions to the proton spin, quark flavor contributions to the spin sum rule, quark flavor polarization in polarized nucleons, recently discovered new quark distribution functions, and project 3D images of the nucleon in the infinite momentum frame. Summary Slide37:  The program of Deeply Exclusive and Semi-Inclusive Experiments at the JLab 12 GeV Upgrade constitutes the next step in the breakthrough experiments to study the internal nucleon structure at a deeper level. It has the potential to revolutionize hadronic physics with electromagnetic probes.

Related presentations


Other presentations created by Freedom

Matter
15. 06. 2007
0 views

Matter

emerging diseases
10. 03. 2008
0 views

emerging diseases

Skoda Report
15. 11. 2007
0 views

Skoda Report

20070813181441372320
12. 10. 2007
0 views

20070813181441372320

Classification6
12. 10. 2007
0 views

Classification6

NMR SOLOMON Chap13
15. 10. 2007
0 views

NMR SOLOMON Chap13

Fiduciaire
17. 10. 2007
0 views

Fiduciaire

EnhancedFujitaScale
05. 10. 2007
0 views

EnhancedFujitaScale

AncientChineseTangra ms
10. 10. 2007
0 views

AncientChineseTangra ms

meek
21. 08. 2007
0 views

meek

time series 2002
21. 08. 2007
0 views

time series 2002

taft hartley
21. 08. 2007
0 views

taft hartley

NLP
07. 11. 2007
0 views

NLP

ETHANOL
07. 11. 2007
0 views

ETHANOL

ALMA Paola FacultyApr07
13. 11. 2007
0 views

ALMA Paola FacultyApr07

Of Mice
17. 11. 2007
0 views

Of Mice

Basic Five Pargraph Essay
19. 11. 2007
0 views

Basic Five Pargraph Essay

lect2
23. 11. 2007
0 views

lect2

Flower
17. 12. 2007
0 views

Flower

05 Pro Waltz
23. 12. 2007
0 views

05 Pro Waltz

ICAI 2004 presentation
31. 12. 2007
0 views

ICAI 2004 presentation

AIMS Prey predator Models
01. 01. 2008
0 views

AIMS Prey predator Models

Romantic
11. 08. 2007
0 views

Romantic

personality testing
11. 08. 2007
0 views

personality testing

040617 GALLAS E talk
29. 09. 2007
0 views

040617 GALLAS E talk

PhaseTransformations
05. 01. 2008
0 views

PhaseTransformations

DiscardRoutes
07. 10. 2007
0 views

DiscardRoutes

Cold War marshall plan
28. 12. 2007
0 views

Cold War marshall plan

tort crime puzzle
07. 01. 2008
0 views

tort crime puzzle

22801
26. 11. 2007
0 views

22801

Beloved Beware
02. 08. 2007
0 views

Beloved Beware

meinshausen
21. 10. 2007
0 views

meinshausen

en ann041230
16. 10. 2007
0 views

en ann041230

solidwas
11. 12. 2007
0 views

solidwas

religiosity sexualbehaiviors
11. 08. 2007
0 views

religiosity sexualbehaiviors

Geog3225 Globalization2
22. 10. 2007
0 views

Geog3225 Globalization2

parmon
26. 10. 2007
0 views

parmon

cs428 Internetworking
30. 12. 2007
0 views

cs428 Internetworking

DaisyModellingUk1
04. 01. 2008
0 views

DaisyModellingUk1

chapter6ile
02. 08. 2007
0 views

chapter6ile

Inland Empire
21. 08. 2007
0 views

Inland Empire

AIDS Ed 3 5 03 Murphy
02. 08. 2007
0 views

AIDS Ed 3 5 03 Murphy

Coulombe CND VIP 26Oct05
01. 11. 2007
0 views

Coulombe CND VIP 26Oct05

Ch6CP
16. 02. 2008
0 views

Ch6CP

plato
11. 08. 2007
0 views

plato

ImmPres
24. 02. 2008
0 views

ImmPres

Smita Gupta
24. 02. 2008
0 views

Smita Gupta

psy230 eysencks theory 06
11. 08. 2007
0 views

psy230 eysencks theory 06

JimGill
28. 02. 2008
0 views

JimGill

color
06. 03. 2008
0 views

color

impacto ampliacion
25. 10. 2007
0 views

impacto ampliacion

This Changed Life
07. 03. 2008
0 views

This Changed Life

Ken singapore
13. 03. 2008
0 views

Ken singapore

Portal mobile
20. 03. 2008
0 views

Portal mobile

turismo
22. 10. 2007
0 views

turismo

Kievan Russia
26. 10. 2007
0 views

Kievan Russia

4 Buku yang baik
14. 11. 2007
0 views

4 Buku yang baik

The Final Project Education
21. 08. 2007
0 views

The Final Project Education

41 xslt
01. 12. 2007
0 views

41 xslt

Crete
10. 04. 2008
0 views

Crete

2006911201819960
13. 04. 2008
0 views

2006911201819960

Milov Carnegie Feb 1 2005 eng
16. 04. 2008
0 views

Milov Carnegie Feb 1 2005 eng

PANCEA ovrvw URGE2 02 v1
17. 04. 2008
0 views

PANCEA ovrvw URGE2 02 v1

24081
02. 08. 2007
0 views

24081

Business 2007
12. 03. 2008
0 views

Business 2007

MercuryWeiler
18. 04. 2008
0 views

MercuryWeiler

Presentation Overall 7 26 07
22. 04. 2008
0 views

Presentation Overall 7 26 07

ompi tm cas 04 8
24. 10. 2007
0 views

ompi tm cas 04 8

6apng mongolia
30. 03. 2008
0 views

6apng mongolia

4a
28. 04. 2008
0 views

4a

approx matches
02. 08. 2007
0 views

approx matches

5 QM06 JHLee
11. 10. 2007
0 views

5 QM06 JHLee

march 01
07. 01. 2008
0 views

march 01

CG in ophthalmology
30. 04. 2008
0 views

CG in ophthalmology

Concordia KV
02. 08. 2007
0 views

Concordia KV

ammos
15. 10. 2007
0 views

ammos

ANS 217Poultry Genetics
02. 08. 2007
0 views

ANS 217Poultry Genetics

18 Hergott Shepard Residence
21. 08. 2007
0 views

18 Hergott Shepard Residence

06WorldDataSheet presentation
02. 08. 2007
0 views

06WorldDataSheet presentation

Neil Lerner
21. 08. 2007
0 views

Neil Lerner

One Stop worker presentation
18. 06. 2007
0 views

One Stop worker presentation

Paternalism
13. 10. 2007
0 views

Paternalism

Learn-Mean Median Mode Range
15. 06. 2007
0 views

Learn-Mean Median Mode Range

Learn Math Flash Measurement
15. 06. 2007
0 views

Learn Math Flash Measurement

Learning Multiplication
15. 06. 2007
0 views

Learning Multiplication

Moths and Butterflies
15. 06. 2007
0 views

Moths and Butterflies

Mock Election
15. 06. 2007
0 views

Mock Election

YaronArielAoIR5
21. 08. 2007
0 views

YaronArielAoIR5

DAMA Overview
29. 10. 2007
0 views

DAMA Overview

5 MerrillCross
19. 11. 2007
0 views

5 MerrillCross

chol ncep
02. 08. 2007
0 views

chol ncep

PoriesPres
11. 08. 2007
0 views

PoriesPres

CLIL Issues
21. 10. 2007
0 views

CLIL Issues

abby
02. 08. 2007
0 views

abby

evenson k4dev 031014
04. 10. 2007
0 views

evenson k4dev 031014

Bazelon 11 14 06 final
29. 10. 2007
0 views

Bazelon 11 14 06 final

7 3 iyer
26. 02. 2008
0 views

7 3 iyer

ahm poster gridblast 2004
28. 12. 2007
0 views

ahm poster gridblast 2004

week five
24. 10. 2007
0 views

week five

facts figures bpc2006
27. 09. 2007
0 views

facts figures bpc2006

JLA Overview
04. 01. 2008
0 views

JLA Overview

MOB7566Intro2006
17. 10. 2007
0 views

MOB7566Intro2006