Texts:
2. The photoproduction of (1520) = *, i.e., p K+* shows the following theoretical and experimental results:
1200 (a) 1000
1500 (b)
Baber (LAMP2) 1980
Muramatsu (LEPS) 2010
1200
800
[qu] da/dcos 60 300
b
A = 650 MeV
30
09 90 120 [deg]
150
E [GeV]
Theoretically, it turns out that the dominant contribution comes from the contact amplitude, which is responsible for conserving the gauge symmetry of the reaction process and encoded by iMcontact = eKgKNAu".e^YSUN, (2) MK where ek represents the electric charge of the kaon in the final state. Show that this contact-term dominance, which is suggested by the theory calculation in terms of the gauge invariance, is supported by the following experimental data:
Proton Deuteron LHK p(SB) LDKp(SB) a120</0150 (b) 150/0<180
1.8
2.2 2.4 1.8 Photon Energy (GeV)
2.2
2.4