MAID Target Polarization

Target Polarization

P₁ P₂ P₃	(in the scattering plane, P₃ along the photon : default)
P_x P_y P_z	(in the reaction plane, P_z along the photon)
P_x'P_y'P_z'	(in the reaction plane, P_z' along the pion)
P_t P_n P_l	(in the reaction plane, P_l along the outgoing nucleon)

(see further details on coordinate frames)

Channel: K⁺L K⁰L K⁺S⁰ K⁰S⁺ K⁺S^- K⁰S⁰Model input (on and off): Born K* (893)K₁(1270)
Resonances in KL:S₁₁(1650)P₁₁(1710) P₁₃(1720) D₁₃(1900) (missing resonance)
Resonances in KS:S₁₁(1650)P₁₁(1710) P₁₃(1720) S₃₁(1900) P₃₁(1910)

Change values of Born couplings, relative to standard values: g_KLN = -13.47, g_KSN = 4.25 (no factors of 4p):

g_KLN	g_KSN

Change values of vector meson couplings G_V,T = g_gKK* g^V,T_K*YN(relative to standard values):

K* (893)		K₁(1270)
G_V	G_T	G_V	G_T

Change values of resonance couplings G_1,2,3= g^1,2,3_gNN* g_KYN(relative to standard values):

KL and KS
S₁₁(1650)		P₁₁(1710)		P₁₃(1720)
G₁	G₃	G₁	G₃	G₁	G₂	G₃

KL only			KS only
D₁₃(1900)			S₃₁(1900)		P₃₁(1910)
G₁	G₂	G₃	G₁	G₃	G₁	G₃

Choose coordinate frame for recoil polarization:
(P₁,P₂,P₃) (P_x,P_y,P_z) (P_x',P_y',P_z') (P_t,P_n,P_l)

Choose polarization parameters for electron (h) and virtual photon (e):

h_electron	e

Choose kinematical variables

choose an independent (running) variable: Q² W QF

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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