Prague isobar model for calculation of p(γ,K
^{+}
)Λ and p(e,e'K
^{+}
)Λ observables
For an overview of our formalism see
Phys. Rev. C
93
, 025204 (2016)
and
Phys. Rev. C
97
, 025202 (2018)
Process selection:
Photoproduction
Electroproduction
Cross sections:
dσ/dΩ
_{c.m.}
Differential cross section in center-of-mass frame
dσ/dΩ
_{lab }
Differential cross section in laboratory frame
Single-polarization observables:
P
Hyperon polarization
Σ
Beam asymmetry
T
Target asymmetry
Double-polarization observables
C
_{x}
C
_{z}
O
_{x}
O
_{z}
Choose running variable:
Energy
Kaon angle
Energy variable:
W
Invariant mass
E
_{γ}
^{lab}
Photon lab energy
Range:
GeV to
GeV
Step size:
GeV
Angular variable:
θ
_{K}
^{c.m.}
[°]
Kaon center-of-mass angle
cos θ
_{K}
^{c.m.}
Value:
Energy variable:
W
Invariant mass
E
_{γ}
^{lab}
Photon lab energy
Value:
GeV
Angular variable:
θ
_{K}
^{c.m.}
[°]
Kaon center-of-mass angle
cos θ
_{K}
^{c.m.}
Range:
to
Step size:
Choose output:
σ
_{T}
, σ
_{L}
, σ
_{TT}
, σ
_{LT}
, σ
_{LT'}
,
σ
_{U}
σ
_{U}
=σ
_{T}
+ ε
_{L}
σ
_{L}
,
σ
_{unpol}
σ
_{unpol}
=Γ[σ
_{T}
+ ε
_{L}
σ
_{L}
+εσ
_{TT}
cos2φ+[2ε
_{L}
(ε+1)]
^{1/2}
σ
_{LT}
cosφ]
, and
σ
_{tot}
σ
_{tot}
= σ
_{unpol}
+hΓ2[ε
_{L}
(1-ε)]
^{1/2}
σ
_{LT'}
sinφ
in CMS
σ
_{T}
, σ
_{L}
, σ
_{TT}
, σ
_{LT}
, σ
_{LT'}
, σ
_{U}
, σ
_{unpol}
, and σ
_{tot}
in lab
σ
_{T}
, σ
_{L}
, σ
_{TT}
, σ
_{LT}
, σ
_{LT'}
, σ
_{U}
, σ
_{unpol}
, and σ
_{tot}
invariant
P
Hyperon polarization
,
Σ
Beam asymmetry
,
T
Target asymmetry
Choose running variable:
Q
^{2}
W
θ
_{K}
^{c.m.}
Kaon center-of-mass angle
cos θ
_{K}
^{c.m.}
t
Range of Q
^{2}
:
GeV
^{2}
to
GeV
^{2}
Step size of Q
^{2}
:
GeV
^{2}
Value of W:
GeV
Value of ε:
Value of
φ
Angle between the lepton and hadron planes
:
°
Value of helicity:
Angular variable:
θ
_{K}
^{c.m.}
[°]
cos θ
_{K}
^{c.m.}
t [GeV
^{2}
]
Value:
Range of W:
GeV to
GeV
Step size of W:
GeV
Value of Q
^{2}
:
GeV
^{2}
Value of ε:
Value of
φ
Angle between the lepton and hadron planes
:
°
Value of helicity:
Angular variable:
θ
_{K}
^{c.m.}
[°]
cos θ
_{K}
^{c.m.}
t [GeV
^{2}
]
Value:
Range of θ
_{K}
^{c.m.}
:
° to
°
Step size of θ
_{K}
^{c.m.}
:
°
Value of Q
^{2}
:
GeV
^{2}
Value of W:
GeV
Value of ε:
Value of
φ
Angle between the lepton and hadron planes
:
°
Value of helicity:
Range of cos θ
_{K}
^{c.m.}
:
to
Step size of cos θ
_{K}
^{c.m.}
:
Value of Q
^{2}
:
GeV
^{2}
Value of W:
GeV
Value of ε:
Value of
φ
Angle between the lepton and hadron planes
:
°
Value of helicity:
Range of t:
GeV
^{2}
to
GeV
^{2}
Step size of t:
GeV
^{2}
Value of Q
^{2}
:
GeV
^{2}
Value of W:
GeV
Value of ε:
Value of
φ
Angle between the lepton and hadron planes
:
°
Value of helicity:
Model variant:
BS1
BS3
Full model
No nucleon resonances
Contribution of background terms only
No resonant states
Contribution of Born terms only