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