% Z+bjet cross section
% The cross section was measured for b-jets with Et>20 GeV and |eta|<1.5 at sqrt(s)=1.96 TeV.
% It is defined as a per-jet cross section, i.e. it is proportional to the number 
% of b-jets and not the number of events.
%
% It was published in 2006:
% http://arxiv.org/pdf/hep-ex/0605099
%
% published Results (0.3 fb^-1):
sigma(Z+b-jet) = 0.93 +- 0.29 (stat.) +- 0.21 (syst.) pb

sigma(Z+b-jet)/sigma(Z)= 0.37 +- 0.11 (stat.) +- 0.08 %

sigma(Z+b-jet)/sigma(Z+jet)= 2.36 +- 0.74 (stat.) +- 0.53 %


% prel Results (2 fb^-1):

- Total cross sections for Et_jet>20 GeV and |eta_jet|<1.5
sigma(Z+b-jet) = 0.86 +- 0.14 (stat.) +- 0.12 (syst.) pb
sigma(Z+b-jet)/sigma(Z)= 0.336 +- 0.053 (stat.) +- 0.041 %
sigma(Z+b-jet)/sigma(Z+jet)= 2.11 +- 0.33 (stat.) +- 0.34 %

- Differential results: in all cases the statistical error is the 1st and the systematic the 2nd. 
Also, we present the ratio to the total Z cross section in all cases, i.e. sigma(xx)/sigma(Z) for 
each measured quantity xx. For all cross sections the generic cuts of Et_jet>20 GeV and 
|eta_jet|<1.5 are applied.

1) versus jet Et. This measurement is proportional to the number of jet (not to the number of event), 
i.e. each b-jet enters. The cross section are given per GeV.
25<Et<35 GeV:	1.43 +/- 0.28 +/- 0.17 x 10^-4 /GeV
35<Et<55 GeV:	0.25 +/- 0.10 +/- 0.03 x 10^-4 /GeV
55<Et<100 GeV:	0.124+/- 0.043+/- 0.020 x 10^-4 /GeV

2) versus jet eta. This measurement is proportional to the number of jet (not to the number of event), 
i.e each b-jet enters. The cross sections are given per unit in eta.
0.0-0.5:	2.48 +/- 0.57 +/- 0.31 x10^-3 
0.5-1.0:	2.93 +/- 0.65 +/- 0.42 x10^-3 
1.0-1.5:	0.81 +/- 0.49 +/- 0.15 x10^-3 

3) versus pt of the Z boson. The cross sections are given per event with >=1 b-jet. 
They are given in units of GeV.
 0<pt(Z)<20 GeV:	4.6 +/- 1.4 +/- 0.7 x10^-5 /GeV
20<pt(Z)<35 GeV:	7.0 +/- 1.9 +/- 0.9 x10^-5 /GeV
35<pt(Z)<55 GeV:	2.9 +/- 1.0 +/- 0.3 x10^-5 /GeV
55<pt(Z)<100 GeV:	1.11 +/- 0.39 +/- 0.04 x10^-5 pb/GeV

4) versus the number of jets. The cross sections are given per event with >=1 b-jet. 
1 jet:  2.24 +/- 0.42 +/- 0.30 x10^-3 
2 jets: 0.80 +/- 0.22 +/- 0.10 x10^-3 

5) versus the number of b-jets. The cross sections are given per event with >=1 b-jet.
1 b-jet:  2.78 +/- 0.44 +/- 0.40 x10^-3 
2 b-jets: 0.23 +/- 0.11 +/- 0.05 x10^-3