Black Box Counting Signatures
The following signatures for the Harvard Black Box were generated with the 5 fb-1 data set using our Mathematica event analysis package Chameleon. The following tables also appear in the Chameleon Tutorial file, which is easy to read and modify. In addition to cuts and triggers made by PGS, we have made the following object and event level cuts for these tables:
All kept photons and leptons (including taus) have pT > 25 GeV and |eta| < 2.
All kept jets have pT > 50 GeV and |eta| < 3.
We keep a missing energy object if pT > 50 GeV.
There are important physics reasons for making such cuts. PGS (as with any real detector) is unreliable for low pT objects, so we want to remove questionable objects in the event record whenever possible. The cut on jets is particularly conservative, but one can loosen any of these cuts if one wants more information about low pT objects.
In the 47502 events that pass these cuts, the number of particles of a given type are:
(See the Offical Black Box page for a discussion of the meaning of these objects, especially that b-jets are really "heavy-flavor tagged" jets.)
There are 27636 events with missing energy greater than 100 GeV, and 7896 events with missing energy less than 50 GeV. In events with missing energy greater than 100 GeV, the number of photons in each event are:
In events with missing energy less than 50 GeV, the number of photons are:
There are 4593 events with missing energy greater than 100 GeV, at least two jets, and at least two photons. In those events, the jet/lepton breakdown is:
Among all single lepton events, the flavor/charge distribution is:
Among all dilepton events, the flavor/charge distribution is:
All kept jets have pT > 50 GeV and |eta| < 3.
We keep a missing energy object if pT > 50 GeV.
There are important physics reasons for making such cuts. PGS (as with any real detector) is unreliable for low pT objects, so we want to remove questionable objects in the event record whenever possible. The cut on jets is particularly conservative, but one can loosen any of these cuts if one wants more information about low pT objects.
In the 47502 events that pass these cuts, the number of particles of a given type are:
0 1 2 3 4 5 6 7+
Jets 8202 5534 5236 6548 8389 7034 4050 2509
0 1 2 3 4 5+
B-Jets 38620 6962 1698 198 24 0
0 1 2 3 4 5+
Leptons 38271 6965 2163 94 9 0
0 1 2 3 4 5+
Photons 14326 21796 11286 93 1 0
|
(See the Offical Black Box page for a discussion of the meaning of these objects, especially that b-jets are really "heavy-flavor tagged" jets.)
There are 27636 events with missing energy greater than 100 GeV, and 7896 events with missing energy less than 50 GeV. In events with missing energy greater than 100 GeV, the number of photons in each event are:
0 1 2 3+
Photons 8987 12992 5603 54
|
In events with missing energy less than 50 GeV, the number of photons are:
0 1 2 3+
Photons 2627 3153 2101 15
|
There are 4593 events with missing energy greater than 100 GeV, at least two jets, and at least two photons. In those events, the jet/lepton breakdown is:
0lep 1lep 2lep 3+lep
2j 625 170 33 6
3j 963 275 39 3
4j 950 213 25 2
5j 587 124 12 1
6j 326 53 7 1
7+j 151 26 1 0
|
Among all single lepton events, the flavor/charge distribution is:
elec- muon- tau- elec+ muon+ tau+ 1386 954 952 1528 1046 1099 |
Among all dilepton events, the flavor/charge distribution is:
elec- muon- tau- elec+ muon+ tau+
elec- 14 19 39 667 66 94
muon- 6 20 75 573 86
tau- 8 90 88 204
elec+ 11 22 39
muon+ 9 23
tau+ 10
|
Black Box Kinematic Distributions
The following plots have been made using Chameleon. You should make your own plots. Really. It's fun.
First, a histogram of missing energy in each event:
The scalar ET sum of objects in events with zero leptons and four or more jets:
An opposite-sign same-flavor dilepton invariant mass distribution for events with zero jets (electrons/muons only).
An opposite-sign same-flavor dilepton invariant mass distribution for events with 2 or more jets (electrons/muons only).
The same plot with flavor-subtraction. (Flavor subtraction means that we sum the e+e- and mu+mu- distributions and subtract the e+mu- and e-mu+ distributions. This is a way to clean up a distribution if the physics is assumed to be flavor-neutral.)
In events with exactly 2 b-jets, the invariant mass of the two b-jets:
