LEPTOTunable switches and parameters in LEPTO 6.5
Last updated: 961101
Lepto switches:
Switch: Short description: Default & alt. values: LST(8) QCD effects D=12 LST(11) F_L, (targetmass, higher twist) D=0, alt. 1 -> F_L LST(15) Parton distributions D=9, alt. any recent distr. LST(16) Parton distributions D=1, alt. any recent distr. LST(20) Cut-off scheme for ME D=5, alt. 6 LST(34) Soft Colour Interactions D=2, alt. 1 or 0=off LST(35) Seaquark treatment D=1 = on, alt. 2 or 0 = off
Lepto parameters:
Parameter: Short description: Default & range of values:
PARL(3) Primordial k_T D=0.44 GeV, 0.3-0.8 GeV
PARL(7) Prob. for SCI D=0.5 , 0.0-0.5
PARL(8) Cut-off in matrix element D=0.04 , 0.0001-0.1
PARL(9) Cut-off in matrix element D=4 GeV^2 , 1.0-100.0 GeV^2
for LST(20)=6 use
PARL(8)=0.001
PARL(9)=1.0 GeV^2
PARL(10) width of the virtuality PARL(10)=0.44 GeV, 0.1-1.0 GeV
distribution of the sea quark
partner for LST(34)=2
PARL(14) p_T in target remnant split D=0.35 GeV, 0.0-0.8 GeV
PARL(20) Mass red. for complex remnant D=0.10 GeV, 0.0-0.25 GeV
PYPAR(21) Lambda_QCD in initial shower D=from parton densities,
0.1-0.4 GeV
PYPAR(22) Cut-off in initial shower D=1 GeV^2 , 0.5-4.0 GeV^2
should preferable be the
same as PARJ(82)^2, other
values may require changing
PARJ(41) and PARJ(42).
Jetset 7.4.07 parameters:
Parameter: Short description: Default & range of values:
PARU(112) Lambda_QCD in alpha_s D=from parton densities,
,0.1-0.4 GeV
PARJ(41) a in fragmentation fcn D=0.3 , *
PARJ(42) b in fragmentation fcn D=0.58 GeV^-2, *
PARJ(81) Lambda_QCD in final shower D=0.29 GeV , *
PARJ(82) Cut-off in final shower D=1.0 GeV , *
* changing these parameters should be done with caution since they have
been tuned from LEP measurements. A change of one of the parameters
may require simultaneous changes of the other parameters as well.