flag
VariationFrag:flav
(default = off
)
For the fragmentation flavor variations, it is possible to perform
post-hoc reweighting without running the in-situ variations below. To
enable post-hoc flavor reweighting, switch this flag on.
wvec
VariationFrag:list
(default = {}
)
Vector of uncertainty-variation strings defining groups of parameter
variations for string fragmentation. The groups are separated by commas,
and the elements of the group are separated by spaces, where the first
element is the group name, and the following elements are the varied
parameters of the form parameter=value
.
For completeness, we note that an example command-file specification could look as follows:
VariationFrag:List = { kinVars frag:ptsigma=0.3 frag:alund=0.6, flavVars frag:rho=0.2 frag:x=0.9 frag:y=0.04 }
frag:aLund
: value for StringZ:aLund
,
the a parameter of the Lund symmetric fragmentation
function.frag:bLund
: value for StringZ:bLund
,
the b parameter of the Lund symmetric fragmentation
function.frag:rFactC
: value for StringZ:rFactC
,
r_c, i.e. the Bowler parameter for c quarks.frag:rFactB
: value for StringZ:rFactB
,
r_c, i.e. the Bowler parameter for b quarks.frag:ptSigma
: value for StringPT:sigma
,
the width sigma in the fragmentation process.Flavour parameters can be adjusted with the following keywords:
frag:xi
: value for
StringFlav:ProbQQtoQ
, the suppression of diquark
production relative to quark production, i.e. of baryon relative to
meson production.frag:rho
: value for
StringFlav:ProbStoUD
, the suppression of s quark
production relative to ordinary u or d one.frag:x
: value for
StringFlav:StringFlav:ProbSQtoQQ
, the suppression of
strange diquark production relative to light
diquark production, over and above the one already given by
StringFlav:ProbStoU
.frag:y
: value for
StringFlav:StringFlav:ProbQQ1toQQ0
, the suppression of
spin 1 diquark production relative to spin 0 one, apart from the
factor of 3 enhancement of spin 1 from counting the number of
states.