"General" binned jet corrections.
N.B. This page will be re-organized soon
Reminder of Jet Correction definition:
The Jet Corrections are defined as the ratio between jet energy in Z peak data
and corresponding Monte Carlo. They are angle-dependent and (in principle)
year-dependent.
The "jet energy" is not unambiguously defined and depends on definitions
and cuts.
Here is a description of the "standard" definition
- the cos(theta) range [-1,1] is divided in
28 bins
- for each bin a histogram is built for E_jet/E_beam
- a thrust cut (greater than 0.8) is applied, basically to
get rid of three-jet events
- each Z event is forced into 2 jets and for each
jet an entry in the corresponding histogram is created
- a gaussian is fitted, using an iterative procedure, to the
"trimmed" histogram (i.e. in the range [-1 sigma, +2 sigma]
according to a "standard" E-flow definition.
- the Jet Correction for each bin is defined as the ratio between
the mean values of the fitted gaussians in data and MC.
(Jet Correction values using different definitions,
for instance from gaussian fit to the full histogram and from
histogram mean values are also available in some cases for comparison)
Find here an example of
code
used to get jet-correction information from
Z data (or MC).
Example of a simple
function which reads the jet correction file
in the ratio.data format and returns the correction corresponding
to a given polar angle.
Find here an example of
kumac
used to make jet correction plots
The statistical error files given below
are given in the same format as the ratio.data files,
and are only used to evaluate the so called
"Jet Correction" systematic uncertainty".
The corresponding files in the format (conventionally fune.dat used by the
actual
Common Ntuple reading code are also provided.
For the "special" analyses, only the fune.dat format is given.
Available Jet Correction files