The Form Factors of the Nucleons: Present Status - Fisica

More documents

Recommendations

Info

2) JLab Hall B, data taken, currently in data analysis phase. Larry Weinstein, Hall B VERY PRELIMINARY presented in Nov. 2012 no radiative corrections. systematics not known. 3) Olympus at DESY, currently nearing end of data taking mode. 2/17/2013 C.F. Perdrisat SAEMP Trento 2013 42
Two-photon exchange is next term to the Born approximation. Affects form factor observables through interference between the single- and two-photon processes. Requires third form factor, and modification of G Ep and G Mp . with: u(p, λN) (GM γμ − F2Pμ /M + F3 γ·K Pμ /M2 ~ ~ ) u(p, λN) ~ ~ ~ ~ GM = GM + δGM, and GE = GE + δGE, YM ≡ Re (δGM/GM); YE ≡ Re (δGE/GM); Y3≡ (ν/M2 Define ~ ~ ) Re (F3/GM) Then, in double-polarization experiments, the measured Pt/Pl ratio Contains 3 additional terms from two-photon exchange P /P = t l 2ε τ(1+ ε) G M E G + Y E 2/17/2013 C.F. Perdrisat SAEMP Trento 2013 43 G M E G Y M + 1 2ε 1+ ε G M E G Y 3
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 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: Preliminary results from run II, No
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

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?