Information Common To All Plots
ρ is calculated using k
t R=0.4 jets reconstructed from
locally calibrated (LCW) topoclusters within |η|<2. The density
calculation is with respect to the Voronoi area of the jets as defined
in
JHEP 0804 (2008) 005. Topoclusters are an attempt to reconstruct three-dimensional
energy deposits in the calorimeter and are built using a
nearest-neighbor algorithm that clusters calorimeter cells with energy
significance (|E
cell|/σ) >4 for the seed, >2 for
neighbors, and >0 at the boundary. E
cell is calibrated
using informaton derived from test beam and detailed GEANT4 simulatons
(EM scale) and σ is the sum in quadrature of the electronic and
expected pileup noise, as described in Sec. 10.5.2 of
JINST 3 (2008) S08003. Topoclusters can be further calibrated using local
information (LCW) as described in
Nucl. Instrum. Meth. A 531 (2004) 481. The value of the pileup
noise (σ
noisepile-up) used in the
topoclustering is optimized for each value of pileup. Pileup is
simulated by overlaying GEANT4 simulated events from PYTHIA (v6.4)
including non-diffractive and diffractive events.
Trimming is implemented (as in arXiv:1306.4945) by re-clustering the
jet into subjets of radius R=0.3. The clusters belonging to subjets
that carry at least 5% of the original jet p
T are kept, and
those clusters in subjets with less than 5% of the original jet
p
T are discarded.
Mean calorimeter-track jet mass ratio distributions
rmtrack jet as a function of jet mass for
anti-kt, R = 1.0 trimmed jets. The distributions are shown
for proton-proton collisions with a centre-of-mass energy of
√s = 8 TeV and an integrated luminosity of L = 20
fb-1 in the central calorimeter region, |η| < 1.2 and
in the range 600 < pT < 800 GeV. The data/MC comparison
Rmtrack jet for Pythia (blue) and Herwig (red)
is shown in the lower part of the plot.
| [eps] |
Mean calorimeter-track jet mass ratio distributions
rmtrack jet as a function of jet pT
for anti-kt, R = 1.0 trimmed jets. The distributions are
shown for proton-proton collisions with a centre-of-mass energy of
√s = 8 TeV and an integrated luminosity of L = 20
fb-1 in the central calorimeter region, |η| < 1.2 and
in the range 600 < pT < 800 GeV. The data/MC comparison
Rmtrack jet for Pythia (blue) and Herwig (red)
is shown in the lower part of the plot.
| [eps] |
Mean calorimeter-track jet mass ratio distributions
rmtrack jet as a function of jet mass/pT for
anti-kt, R = 1.0 trimmed jets. The distributions are shown
for proton-proton collisions with a centre-of-mass energy of
√s = 8 TeV and an integrated luminosity of L = 20
fb-1 in the central calorimeter region, |η| < 1.2 and
in the range 600 < pT < 800 GeV. The data/MC comparison
Rmtrack jet for Pythia (blue) and Herwig (red)
is shown in the lower part of the plot.
| [eps] |
Major updates:
--
MichaelBegel - 07-Aug-2013
Responsible:
MichaelBegel
Subject: public