MAID Target Polarization

Target Polarization

Pa, Pb, Pc	(in the lab frame, Pc along the electron : default)
P1, P2, P3	(in the scattering plane, P3 along the photon)
Px, Py, Pz	(in the reaction plane, Pz along the photon)
Px', Py', Pz'	(in the reaction plane, Pz' along the pion)
Pt, Pn, Pl	(in the reaction plane, Pl along the outgoing nucleon)
h	electron polarization (helicity)

(click here for further details on coordinate frames)

Channel: (pi⁰,p) (pi⁰,n) (pi⁺,n) (pi^-,p)

Model parameters: Born Rho Omega P33(1232) P11(1440)
D13(1520) S11(1535) S31(1620) S11(1650) F15(1680) D33(1700)

Change of S-wave low-energy corrections and type of pi-N coupling (click here for details)
E₀₊	S₀₊	PS-PV mixing range parameter Lambda

Change values of resonance couplings (relative to standard values):
P33(1232)			S31(1620)		D33(1700)
M₁₊	E₁₊	S₁₊	E₀₊	S₀₊	M_2-	E_2-	S_2-

P11(1440)

D13(1520)

S11(1535)

S11(1650)

F15(1680)

M_1-

S_1-

M_2-

E_2-

S_2-

E₀₊

S₀₊

E₀₊

S₀₊

M_3-

E_3-

S_3-

Choose coordinate frame for target polarization:
in lab: (Pa,Pb,Pc) in cm:(P1,P2,P3) (Px,Py,Pz) (Px',Py',Pz') (Pt,Pn,Pl)

Choose virtual photon polarization: e =

Choose kinematical variables

choose an independent (running) variable: Q² W Q F
choose values for Q², W, Q, F, step size and maximum value:

Q² (GeV/c)² W (MeV) Q (deg) F (deg) increment upper value

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