The Form Factors of the Nucleons: Present Status - Fisica

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Dirac and Pauli nucleon form factors Parametrize the four Sachs form factors, and calculate F 1 and F 2. Use Kelly form: polynomial/polynomial with asymptotic 1/Q 2 ratio behavior. F 1n negative at Q 2 ~0 because G En~0 and G Mn is negative. F 2n/κ n ~ F 2p/ κ p; but the neutron data are extrapolated. All 4 factors have a smooth behavior, and the data are internally consistent. 2/17/2013 C.F. Perdrisat SAEMP Trento 2013 26
Quark Flavor separation Assume that hadron current: ,with e u and e d the charge of the up and down quarks and isospin symmetry: Fd 2n Fu 1n Fu 2n Fd 1p Fd 2p Then the Pauli and Dirac form factors of the dressed quarks in the proton are (with related relations for the neutron): F u 1p F u 2p 2F 1p 2F 2p F 1n F 2n Fd 1n Fu , 1p Fu , 2p F d 1p F d 2p F 2p See for example: Cates,deJager,Riordan,Wojtsekhowski (2011), Rohrmoser, Choi and Plessas, (2011), Wilson,Cloet,Chang and Roberts, (2012), Cloet and Miller (2012) 2/17/2013 C.F. Perdrisat SAEMP Trento 2013 27 F 1p 2F 1n 2F 2n
Page 1 and 2: The Form Factors of the Nucleons: P
Page 3 and 4: Results for the proton’s G Ep and
Page 5 and 6: One-photon exchange or Born approxi
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: The proton is not spherical? Not a
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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