The Form Factors of the Nucleons: Present Status - Fisica

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Outline: Nucleon Form Factors The two methods to obtain GE and GM, the space-like electromagnetic form factors of the proton and neutron, are Rosenbluth separation based on cross sections, and asymmetry in double polarization as in Compare old and new results for G E and G M, proton and neutron. Highlight new paradigm. Short theory overview. eN eN, eN eN Comparison of G E/G M and F 2/F 1 to theoretical model predictions, for proton and neutron. Some consequences for structure and shape of the nucleon. Validity of Born approximation: Radiative corrections? Or just physics. What is the radius of the proton? C.F. Perdrisat, V. Punjabi, M. Vanderhaeghen, Progress in Particle and Nuclear Physics, 59 (2007), 694, and, on the web: C.F. Perdrisat, V. Punjabi www.scholarpedia.org/article/Nucleon_Form_factors (2010) 2/17/2013 C.F. Perdrisat SAEMP Trento 2013 4 .
One-photon exchange or Born approximation j = J = OPEX The hadronic current is: Γ μ F (q2)γ μ 1 iσ μν q F (q2) ν 2 2M • F 1 (Dirac): electric charge and Dirac magnetic moment • F 2 (Pauli): anomalous magnetic moment The ep cross section is then (cumbersome) 2/17/2013 C.F. Perdrisat SAEMP Trento 2013 5
Page 1 and 2: The Form Factors of the Nucleons: P
Page 3: Results for the proton’s G Ep and
Page 7 and 8: Rosenbluth Separation Method In ter
Page 9 and 10: All Rosenbluth separation data for
Page 11 and 12: Polarization Transfer Method h beam
Page 13 and 14: Results for the G Ep/G Mp ratios fr
Page 15 and 16: Previous slides illustrate discrepa
Page 17 and 18: 2/17/2013 Many theoretical models a
Page 19 and 20: Dressed quarks in the Nucleon Dress
Page 21 and 22: Perturbative QCD (pQCD): Asymptotic
Page 23 and 24: GPDs and Electromagnetic FF The fir
Page 25 and 26: The proton is not spherical? Not a
Page 27 and 28: Quark Flavor separation Assume that
Page 29 and 30: Quark Flavor separation (II) In Rob
Page 31 and 32: Fd 1n Fd 2n Fu , 1p Fu , 2p Proto
Page 33 and 34: Each of the neutron Sachs form fact
Page 35 and 36: More about the Rosenbluth versus do
Page 37 and 38: Radiative correction to the last da
Page 39 and 40: Currently 3 attempts to measure two
Page 41 and 42: Preliminary results from run II, No
Page 43 and 44: Two-photon exchange is next term to
Page 45 and 46: P ℓ / P ℓ Born Kivel and Vander
Page 47 and 48: Mainz JLab Mostly Hydrogen Lamb shi
Page 49 and 50: 1) At Jlab E08-007, data taking com
Page 51 and 52: Conclusions continued • Much has
Page 53: The following collaborators were in

The Form Factors of the Nucleons: Present Status - Fisica

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