The Form Factors of the Nucleons: Present Status - Fisica

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Electric Form Factor of the Neutron My Fit Lomon Bijker All double polarization results for G En, including new JLab Hall A (Gen(I)). Most recent: Riordan et al., Phys Rev Lett 105, (2010) 262302 Geis et al., Phys. Rev. Lett. 101, 042501 (2008) Take notice of energy log scale, chosen to amplify the role of small Q 2 data. 2/17/2013 C.F. Perdrisat SAEMP Trento 2013 14
Previous slides illustrate discrepancy between Rosenbluth and double-polarization data for the proton data; for the neutron all data shown are double-polarization. Older cross section data are not compatible with the modern results (they required large nuclear structure corrections). So a possible incompatibility of the G En/G Mn results from cross sections (Rosenbluth) and from double polarization is not documented for the neutron. The proton discrepancy has been called the form factor crisis. It is not solved yet. I will address it later in this talk. 2/17/2013 C.F. Perdrisat SAEMP Trento 2013 15
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: Results for the G Ep/G Mp ratios fr
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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