User may change, with precautions, the starred items, while the doubly starred ones should never be changed.

Parameter Position and Meaning
CMSene xpar(1) (=100): \(\sqrt{s}\), centre-of-mass (CMS) energy [GeV]
DelEne xpar(2) (=0d0): Beam energy spread [GeV]
Ninp xpar(3) (=5): Input unit number (unused)
Nout xpar(4) (=16): Output unit number
LevPri xpar(5) (=0): PrintOut Level 0,1,2
Ie1Pri xpar(6) (=1): PrintOut Start point
Ie2Pri xpar(7) (=1): PrintOut End point
WtMax* xpar(9) (=1): Maximum weight for rejection
KeyWgt xpar(10) (=0): Switch between constant =0 and variable =1 weight events
IdeWgt* xpar(11) (=74): Ident of the EEX principal weight
KeyELW xpar(12) (=1): Type of electroweak corrections, =0 only for tests, =1 default for DIZET
vvmin* xpar(16) (=1D-5): Minimum real photon energy in units of beam energy
vvmax xpar(17) (=1d0): Maximum value of \(v=1-s'/s\)-variable, where \(s'\) is mass squared of \(f\bar{f}\) system including FSR photons! See more comments in the text.
DelFac* xpar(18) (=1d-3): FSR cut eps=vvmin*DelFac
KeyISR xpar(20) (=1): Test switch, KeyISR=0 switches off the ISR
KeyFSR xpar(21) (=1): Test switch, KeyFSR=0 switches off the FSR
KeyPia** xpar(22) (=1): Removal of FSR photons below Emin=Ene*Delta in CMS, for KeyPia=0,1 removal is OFF,ON
mltISR** xpar(23) (=0): Special tests: fixed ISR multiplicity for mltISR>0
mltFSR** xpar(24) (=0): Special tests: fixed FSR multiplicity for mltFSR>0
KeyFix xpar(25) (=0): Type of ISR, for KeyFix=0,1 QED without beamstrahlung, for KeyFix=2 beamstrahlung is ON, see also KeyGrid
KeyWtm** xpar(26) (=0): Special tests only: mass terms in “crude” MC photon distrib.
KeyINT xpar(27) (=2): Switch of ISR-FSR Interference (IFI), for KeyINT=0 it is OFF, for KeyINT=2 it is ON, KeyINT=1 is only for special tests
KeyGPS xpar(28) (=1): Level of new exponentiation CEEX, note vmaxGPS overrules KeyGPS for each type of final fermion
KeyQSR xpar(29) (=1): Photon emission from the final quarks is ON,OFF for KeyQSR=0,1

Technical cuts for non-IR real photon corrections etc.

Parameter Position and Meaning
AlfInv* xpar(30) (=137.0359895D0): Inverse of \(\alpha_{\rm QED}\)
GNanoB* xpar(31) (=389.37966D3): GeV\(^{-2} \to\) [nb] conversion factor
Gfermi* xpar(32) (=1.16639d-5): Fermi coupling [GeV\(^{-2}]\)

Technical cuts for non-IR real photon corrections etc.

Parameter Position and Meaning
Xenph** xpar(40) (=1.25d0): Enhancement factor for “crude” photon multiplicity
vcut1* xpar(41) (=1.d-9): Technical cut for single non-IR bremsstrahlung correction
vcut2* xpar(42) (=5.d-2): Technical cut for double non-IR bremsstrahlung correction
vcut3* xpar(43) (=0.1d0): Technical cut for triple non-IR bremsstrahlung correction

QCD flags/data

Parameter Position and Meaning
KeyHad xpar(50) (=1): Hadronization/showering flag, for KeyHad=0,1 hadronization is OFF,ON
HadMin* xpar(51) (=0.200d0): Minimum mass [GeV] for hadronization/showering
alfQCD* xpar(52) (=0.118d0): \(\alpha_{\rm QCD}\)

Non-zero beam polarization may require adjustment of WtMax

Parameter Position and Meaning
spin1x xpar(61) (=0d0): Polarization vector beam 1, \(x\)-component
spin1y xpar(62) (=0d0): Polarization vector beam 1, \(y\)-component
spin1z xpar(63) (=0d0): Polarization vector beam 1, \(z\)-component
spin2x xpar(64) (=0d0): Polarization vector beam 2, \(x\)-component
spin2y xpar(65) (=0d0): Polarization vector beam 2, \(y\)-component
spin2z xpar(66) (=0d0): Polarization vector beam 2, \(z\)-component

Beamstrahlung parameters for Thorsten Ohl’s package CIRCE

Parameter Position and Meaning
IRCroots xpar(71) (=350d0): \(\sqrt{s}\) [GeV] discrete values 350,500,800 GeV
IRCacc xpar(72) (=3d0): Accelerator type
IRCver xpar(73) (=5d0): Version number
IRCdat xpar(74) (=19980505d0): Date
IRCxchat xpar(75) (=1): Printout level
KeyGrid* xpar(76) (=2): Activated by setting KeyFix=2. KeyGrid=2 invokes Foam, KeyGrid=0,-1,+1 invokes Vegas: KeyGrid=0 creates and writes Vegas grid on the disk, KeyGrid=-1 creates and dumps grid on the disk, +1 reads only