1. What Makes Strong QCD so Intriguing
Ralf W. Gothe
Graduate Lecture Series
Universidad Michoacana de San Nicolás de Hidalgo
Morelia, México, Marcha 12-15, 2018
My talk will be about the electroexcitation of nucleon resonances.
This conferences is all about nucleons and baryons.
Nathan Isgur has been a strong supporter of a nucleon research program at this laboratory. He formulated the importance of studies of the nucleon in 3 remarks he made at the N*2000 conferences in this auditorium:
Essentials: Phase Space Cells, Coherence, Form Factors, …
QCD Knowns: Deep Inelastic Scattering and Heavy Quark Systems
QCD Unknowns: Nonperturbative QCD, Mass, Confinement, …
This work is supported in parts by the National Science Foundation under Grant PHY

2. Essentials from Nuclei to Quarks
Ralf W. Gothe
Graduate Lecture Series
Universidad Michoacana de San Nicolás de Hidalgo
Morelia, México, Marcha 12-15, 2018
My talk will be about the electroexcitation of nucleon resonances.
This conferences is all about nucleons and baryons.
Nathan Isgur has been a strong supporter of a nucleon research program at this laboratory. He formulated the importance of studies of the nucleon in 3 remarks he made at the N*2000 conferences in this auditorium:
Essentials: Phase Space Cells, Coherence, Form Factors, …
QCD Knowns: Deep Inelastic Scattering and Heavy Quark Systems
QCD Unknowns: Nonperturbative QCD, Mass, Confinement, …
This work is supported in parts by the National Science Foundation under Grant PHY

3. E = mc2 Matter E=CV/2= 1 kJ m=E/c2 = 1.1.10-11 g C=80mF and V=5kV
defibrillator
E=CV/2= 1 kJ
m=E/c2 = g
C=80mF and V=5kV
d=1mm A=9000m2

4. Resolution
Momentum Space
Volume
No inplane asymmetry

5. Double Slit Experiment=
Photons
Dt Wilking, Dz Michelson, Dx Hanbury Brown Twiss

6. Quasi-Elastic Electron Scattering
K1m
K2m Km
P1m
P2m N * N
Localization ↔ Statistical Motion
Phase Space & Phase Space Cells
Fermi Momentum
Fermi Broadening

7. Quasi-Elastic Electron Scattering

8. Coherent Electron Scattering

9. Form Factors and Charge Density Distribution

10. Form Factors and Charge Density Distribution

11. Form Factors and Charge Density Distribution

12. Form Factors and Charge Radii

13. Nucleon Form Factors Dirac magnetic dipole moment of a
structureless spin 1/2 particle

14. Nucleon Form Factors 12

15. n bonds and n+1 constituents
Form Factor Scaling n 6n
n bonds and n+1 constituents

16. Deep Inelastic Scattering
DIS

17. Point-Like Constituents
~ Q-8
PRL 23 (1969) 935
Prog. in Phys. 4 (1982)

18. Point-Like Constituents with Spin 1/2
PRL 22 (1969) 156
F1 structure function vanishes
for spin-zero particles
Callan-Gross relation follows
for spin ½ Dirac Particles

19. Quasi-Elastic Scattering
Quark-Hadron Duality
PRL 16 (1970) 1140, PR D4 (1971) 2901
E.D. Bloom and F.J. Gilman
W = 1.9 GeV
E’ = 17.6 GeV
n = 2.37 GeV
Q2 = 1.72 GeV
mq = 0.36 GeV
mq = Q2/2n
pF = 0.67 GeV
rF = 0.79 fm
DrF = hc *√9p/2
DpF
PR D22 (1975) 1884
S. Stein et al.

20. Quark Charges and Momentum Distributions
x.v
x.q= x.s/2
Isospin Symmetry
For backward scattering: neutrinos couple only to quarks and antineutrinos only to antiquarks, due to angular momentum and helicity conservation.

21. Di-Quarks in Deep Inelastic Scattering
Nucl. Phys. B371 (1992) 3
= 2/3
= 1/4
Only the u valence quark carries
large x in the proton and the only
the d valence quark in the neutron.

22. Di-Quarks in Deep Inelastic Scattering
Arrington et al. (2009)
Bonus, PRL 108, (2012) 1
1/4
Holt and Roberts, arXiv: v3 (2010)
= 1/4
Only the u valence quark carries
large x in the proton and the only
the d valence quark in the neutron.

23. Heavy Quark Systems
Alpha_bb = PDG

24. Hydrogen Atom Coulomb Potential
100
B= eV
U= eV ah
𝑈𝑝=− 𝑐 𝑟𝑏
𝑇= ∆𝑝2 2𝑚 = ( )2 2𝑚𝑐2𝑟𝑏2 hc
<𝑇> =−< 𝑈𝑝 2 >

25. Heavy Quark Systems Virial Theorem:
as= 3/4 hc/rminmc2 = for rcc = 0.4fm
and
as= 3/4 hc/rminmc2 = for rbb = 0.2fm
Alpha_bb = PDG

26. Dirac Delta Function, Fields, Potentials, and Sources
= 0 only for n = -2 and r > 0

27. Heavy Quark Systems Bali et al. he-la/0512018
Infinetly heavy sources, u,d,ubar,dbar sea-quarks with strange quark mass, which shows that the string breaks at 2 times the strange quark mass
APS 09GHPCDRoberts.pdf