SusyCSCNotesFigures
Introduction
This page contains the figures from the SUSY chapter of the CSC book.
Data-driven top/W/Z background estimations
Figure 1
The missing transverse energy (top) and effective mass (bottom) distributions
for the background processes and for an example SUSY benchmark point (SU3)
in the one-lepton mode for an integrated luminosity of 1 inverse femtobarn.
The black circles show the SUSY signal.
The black full histogram shows the sum of all Standard Model backgrounds; also shown in
different colours are the various components of the background.
Figure 2
The missing transverse energy distribution for top quark-pairs (top) and
SUSY (SU3, bottom) signal. In both figures, the solid and dashed histograms
show the missing transverse energy distribution for transverse mass larger
than 100
GeV and less than 100
GeV, respectively. The numbers are
normalized to 1 inverse femtobarn.
Figure 3
The missing transverse energy (top) and effective mass (bottom) distributions of the background
processes for the one-lepton mode with an integrated luminosity of 1 inverse femtobarn.
The open circles show the estimated distributions with the MT method.
The black full histogram shows the true sum of all Standard Model backgrounds; different
symbols show the various contributions to the background.
Figure 4
The missing transverse energy distribution of the background processes for the one-lepton
mode with an integrated luminosity of 1 inverse femtobarn.
The red dots show the estimated distributions with the MT method, with SUSY
signal (SU3) present.
The black full histogram shows the sum of all Standard Model backgrounds,
and the OPEN histogram shows the SUSY signal (SU3).
The transverse mass distributions of the various SUSY signals (SU1, SU2 and SU3)
with an integrated luminosity of 1 inverse femtobarn.
Background processes are superimposed for comparison.
The black full histogram shows the sum of all Standard Model backgrounds.
Figure 5
The missing transverse energy (top) and effective mass (bottom) distributions of the background
processes for one lepton mode with an integrated luminosity of 1 inverse femtobarn.
The red dots show the estimated distributions with the
new MT method.
The black full histogram shows the sum of all Standard Model backgrounds. The open
circles indicate the SUSY (SU3) signal.
Figure 6
Normalized distributions for reconstructed mass of the top quark with leptonic
W-decay (top), reconstructed mass of the hadronically decaying W (middle),
and reconstructed mass of the top quark with hadronic W-decay (bottom),
for top quark-pair production, W plus jets events, and SU3
SUSY events, using the
topbox method.
Figure 7
Distribution of the number of b-jet pairs for events passing the
control sample requirements in the kinematic reconstruction method.
The fraction of di-leptonic top events with no b-jet pairs is dominated by events with
at least one b-jet which is not among the three highest-pT jets.
Distribution of missing transverse energy for di-leptonic top events with one tau lepton and
events with a misidentified lepton compared to the estimation from resimulated events
with an integrated luminosity of 1 inverse femtobarn. The requirement on the number of
b-jet pairs is not applied to the resimulated events. The distribution of all
di-leptonic top events is also shown.
Figure 8
The missing transverse energy (top) and effective mass (bottom) distributions for the estimated
and true di-leptonic top contribution for the one-lepton SUSY search. Black
points (red curve) represent
the estimation without (with) the presence of a signal from SUSY (SU3).
Figure 9
Reconstructed missing transverse energy distribution in
lepton+jet top
quark-pair events with
transverse mass larger than 100
GeV at Monte Carlo truth level.
Top plot: as a function of truth leading-jet pT. Bottom plot: as a function of truth
second-leading jet pT.
Figure 10
Top plot: Points: Predicted missing transverse energy significance distribution in a
top quark-pair plus W + jets events sample. Histogram: actual missing
transverse energy significance distribution.
Bottom plot: Predicted HT2 distribution in the same sample.
Histogram: actual HT2 distribution.
Figure 11
Histogram: observed missing transverse energy significance
distribution for the sum of top quark-pair plus W + jets
background plus SUSY signal. Open circles:
SUSY signal. Blue triangles: true top quark-pair plus W + jets
background. Black filled circles:
estimated background. The SUSY signal shown here is the _1
TeV
SUSY_ point.
Open circles: true SUSY signal as a
function of missing transverse energy
significance. Black: estimated SUSY yield, obtained from the
difference of the observed missing transverse energy significance distribution minus
the estimated background distribution.
Figure 12
Distributions of lepton-jet invariant mass values for
various different Standard Model backgrounds and SUSY signal. The
histograms show distributions of `data' events selected with the
di-leptonic top selection. The data-points show the
equivalent distribution estimated with redecay simulation, normalised
to the peak.
Figure 13
Missing transverse energy (top) and effective mass (bottom)
distributions of events passing the basic one-lepton SUSY
selection cuts. Note that Z+jet and W+jet backgrounds are
under-represented in these plots
for missing transverse energy less than 80
GeV or effective mass
less than 350
GeV due to filter
requirements applied to the respective Monte Carlo samples.
Figure 14
Distributions in missing transverse energy (left), transverse mass (center)
and reconstructed hadronic top mass (right) of single-lepton top quark-pairs
(top row), di-leptonic top-pairs (second row), W + jet events
(third row) and SUSY SU3 (bottom row). Each distribution is overlaid with a projection
of the three-dimensional model that is fitted to that sample.
Figure 15
Distribution of missing transverse energy (left), transverse mass (center) and
reconstructed hadronic top mass (right) of a 1-inverse-femtobarn mix
of top quark-pairs, W plus jets events,
and SUSY SU3 events overlaid with projections of the
combined model on these observables that was fitted to this mix of
events with floating yield parameters and floating shape
parameters. For each projection the contributions of the one-lepton
top quark-pair contribution (dark blue), di-lepton top quark-pair
contribution (light blue), W+jet contribution (red) and ansatz SUSY
constribution (black) are shown.
Figure 16
The missing transverse energy (top) and effective mass distributions (bottom) of
the SUSY signal and background processes for the no-lepton mode with an integrated
luminosity of 1 inverse femtobarn.
The open circles show the SUSY signal (SU3 point).
The shaded histogram shows the sum of all Standard Model backgrounds; different symbols
show the various components.
Figure 17
Top plot: missing transverse energy distribution after all corrections for Z
bosons decaying to neutrino pairs, electron-positron (and e+X) pairs,
and muon pairs.
The number of events corresponds to an integrated luminosity of 1 inverse
femtobarn. The corrections take into account the different branching ratios,
and fiducial, kinematic, and lepton identification factors.
Bottom plot: effective mass distribution for the same physics processes.
Figure 18
The estimated distributions of missing transverse energy and the effective mass
of the top quark-pairs, W + jets and QCD backgrounds in the no-lepton mode
with a luminosity of 1 inverse femtobarn.
In the two top plots, no SUSY signal is present in the data, and
black/red histograms show the true/estimated (MT method) background distributions.
In the other four plots, a SUSY SU3 signal is present in the data, and the blue histograms
show the background plus the SUSY signal.
In the two middle plots, no correction was applied. In the two bottom
plots, a correction with the
new MT method was performed.
Figure 19
Distribution of the missing transverse energy of top quark-pair events with
one hadronic tau decay, for (circles) top quark-pair selection
as in this analysis (control sample), and (squares) for the SUSY
no-lepton mode selection.
Data-driven QCD background estimations
Figure 1
<met/sqrt(Sigma ET> vs. etaj, where j is the first or second
highest-pT jet in each event (points). The non-fiducial regions
selected with a cut at 0.95 (dashed line) are also shown (shaded
areas; see text). These regions correspond to the LAr barrel-endcap
and HEC-forward transition regions.
Figure 2
The |Deltaphi(j1,MET)| - |Deltaphi(j2,MET)| plane for QCD multijet
(top) and SUSY SU3 events (bottom) passing SUSY jet cuts and MET >
100GeV.
Figure 3
The Deltaphi(min) distribution for QCD multijet (solid line) and SU3
SUSY (dashed line) events passing the SUSY jet cuts and with MET > 100
GeV, as described in the text. Good discrimination is achieved with a
cut at Deltaphi(min) = 0.2 (vertical dotted line).
Figure 4
Up-minus-down timing distribution in
TileCal for a simulated Monte
Carlo di-jet sample. As expected, the distribution peaks near 0. NB Figure is rotated!
Figure 5
Up-minus-down timing distribution in
TileCal for a simulated Monte
Carlo cosmic ray sample. As expected, the distribution peaks near -18
ns. NB Figure is rotated!
Figure 6
The Meff distribution for simulated QCD events satisfying SUSY jet
cuts described in Section 1. The top plot shows the number of
events per bin, scaled to 1 fb-1 and the bottom plot shows the
fractional difference with respect to CTEQ6.1M. In each case, the
solid histogram and shaded band shows the results from the CTEQ6.1M
proton PDF. The dashed and dotted histograms show the results from the
MRST2004 and
CTEQ6L1 PDFs, respectively. The error bars reflect the
Monte Carlo statistics.
Figure 7
The Meff distribution for simulated QCD events satisfying SUSY jet
cuts described in Section 1. The top plot shows the number of events
per bin and the bottom plot shows the fractional uncertainty with
respect to the PYTHIA -- ATLAS default model for the underlying
event. In each plot, the solid histogram shows the results from the
PYTHIA -- ATLAS default, the dotted histogram shows PYTHIA --
Tune A, the dashed histogram shows PYTHIA -- no MPI and the
dot-dashed histogram shows JIMMY -- ATLAS default. The error bars
reflect the Monte Carlo statistics.
Figure 8
The Meff distribution for simulated QCD events satisfying SUSY jet
cuts described in Section 1. The top plot shows the number of events
per bin and the bottom plot shows the fractional uncertainty with
respect to the central prediction. The shaded bands show the estimated
uncertainty on the observable for assumed JES uncertainties of 10 %
(light), 5 % (medium-light), 3 % (medium) and 1 % (dark).
Figure 9
The pT distributions of the four highest-pT jets; (a) the leading, (b)
the second (c) the third and (d) the fourth jet for PYTHIA (open
circles) and ALPGEN (open histogram) events.
Figure 10
(a) ATLFAST met distribution for PYTHIA(circles) and ALPGEN
(histogram) and (b) the relative difference
(N(PYTHIA)-N(ALPGEN))/N(ALPGEN) of the met distributions. The shaded
band is the Monte Carlo statistical error.
Figure 11
(a) ATLFAST Meff distribution for PYTHIA(circles) and
ALPGEN (histogram) and (b) the relative difference (N(
PYTHIA)-N(tt ALPGEN))/N(ALPGEN) of the Meff
distributions. The shaded band is the Monte Carlo statistical error.
Figure 12
Event by event difference in number of jets between full GEANT4
simulation and PJTF (blue,solid) and between full GEANT4 simulation
and ATLFAST (red,dashed). The top plot is for 140
GeV < pT < 280
GeV
events, and the bottom one is for 560
GeV < pT < 1120
GeV events.
Figure 13
Top: distributions of the scalar pT sum of the four
leading jets in PJTF (black, solid), ATLFAST (red, solid) and
fully GEANT4 simulated jets (blue, points). The top plot is for
140
GeV < pT < 280
GeV events, and the next plot is for
560
GeV < pT < 1120
GeV. Bottom: the ratio with respect to the
fully GEANT4 simulated jets.
Figure 14
Fake MET distributions from ATLFAST (red hatched), PJTF technique
(black, solid) and full GEANT4 simulation (blue, points). Also shown
with the dashed green line is the PJTF distribution without soft-jet
correction. The top plot is for 140
GeV < pT < 280
GeV events, and
next plot is for 560
GeV < pT < 1120
GeV. Bottom plots are the ratio
of each distribution with respect to the full GEANT4 simulation.
Figure 15
MET (top) and Meff (bottom) distributions of 560 < pT < 2240
GeV
PYTHIA QCD jet events simulated with ATLFAST (light/red solid), the
PJTF technique (dark/black, solid) and full GEANT4 simulation
(points). Events were required to pass the SUSY jet cuts described in
Section 1.
Figure 16
Reconstructed jet multiplicity (top) and highest jet pT (bottom) for
PYTHIA dijet samples simulated with different options. The
statistical uncertainty only is shown for the full simulation sample.
Figure 17
Leading jet pT resolution (top) and MET (bottom) for
PYTHIA dijet samples simulated with different options. The
statistical uncertainty only is shown for the full simulation sample.
Figure 18
Transverse sphericity (top) and Meff (bottom) for
PYTHIA dijet samples simulated with different options. The
statistical uncertainty only is shown for the full simulation sample.
Figure 19
Standard deviations of Gaussian fits to measured response distributions vs.
pT^gamma. The fit is of the functional form
sigmaR(pT) = A + B*pT^-1/2 + C*pT^-1.
Figure 20
Top -- smearing function for a
jet of 250
GeV (thick line), with Gaussian and non-Gaussian
components (right and top facing hatches respectively) shown
separately. Bottom -- dijet balance distribution (points) compared
with the equivalent estimated distribution obtained from the jet
response function to provide a `closure test' of the technique. Also
shown are a Gaussian fit to the region 0.8 < R3(j) < 1.15 (thick
line), and the non-Gaussian tail distribution (dashed histogram)
measured with `Mercedes' events normalised to the tail of the dijet
balance distribution.
Figure 21
MET (top) and Meff (bottom) distributions for smeared events and
GEANT4 `data' passing 0-lepton SUSY jet cuts. Also included for
comparison are 23.8 pb^-1 of SUSY (SU3) and the summed contribution from
Z->nunubar + jets, Wlnu + jets and ttbar + jets.
Figure 22
Points: MET distribution for the non-isolated lepton sample.
Histogram: MET distribution for the isolated lepton sample. The two
distributions have been normalized to the same area in the region
MET=[10,20]
GeV.
Figure 23
Top: distribution of the effective mass in the bbbar+jets sample
after the jet and lepton selection cuts. Bottom: MET distributions
for ttbar isolated muon sample (black filled circle), ttbar
non-isolated muon sample (red filled square), W+jets isolated
muon sample (black open circle), W+jets non-isolated muon
sample (black open square), bbbar isolated muon sample (blue open
triangle), bbbar non-isolated muon sample (magenta filled
triangle).
Figure 24
Black circles: MET distribution for ttbar plus W+jets
samples where the lepton is non-isolated
(ET^cone=[10,20]
GeV). Histogram: MET distribution
for ttbar plus W+jets samples with isolated leptons
(ET^cone<10
GeV).
Prospects for SUSY discovery based on inclusive searches
Figure 1
Meff distribution for events surviving successive selection cuts: cut 1 (1st from top),
cut 2 (2nd from top), and cuts 3-5 (3rd from top). The open circles represent
point SU3, and the different background contributions are shown according to the legend.
The last plot (4th from top) show all of the SUSY benchmark points
and the total Standard Model background after cuts 1-5. Open
circles represent the SUSY SU3 signal as predicted by Monte Carlo
simulation, while the shaded area shows the total Standard Model
background.
Figure 2
Meff distribution for the 0-lepton plus 2-jet analysis, after final cuts.
Top: The open circles show the SUSY (SU3) signal Monte Carlo
prediction, while the total Standard Model background is shown by the
shaded histogram. The individual background contributions are shown by
the points, as described in the legend. Bottom: The points show the
distribution of the signal for a number of SUn points.
Figure 3
Expected Meff distributions after Cuts 1-4 (top),
and Cut 6 (Bottom) for the 1-lepton analysis.
Figure 4
The Meff distributions
for each of the SUn benchmark points, and for the sum of the
Standard Model backgrounds with 1 fb-1 for the 1-lepton analysis.
All the cuts except on Meff are applied
Figure 5
Meff distribution for events with one lepton and: 2 jets
(top) or 3 jets (bottom) after all cuts were applied.
Figure 6
Significance of signal events
for the four benchmark points, as a function of the cut on transverse
missing energy (top) and the transverse momentum of the leading jet
(bottom), for an integrated luminosity of 1 fb-1
Figure 7
MissingEt in
the same sign dilepton events after all cuts except the
MissingEt cut.
Figure 8
The Meff distributions for
SUSY signals and Standard Model backgrounds in the tau analysis after Cuts 4, 5, 6, and 7
Figure 9
Meff
distributions for b-jet analysis. Top: Standard Model backgrounds.
Bottom: SUSY signals with total background.
Figure 10
Efficiencies for electrons as a function of pT for the SU3
sample (top) and eta for the ALPGEN sample Z->ee
(bottom). The solid red line corresponds to the Geant 4 simulation, the solid circles to uncorrected ATLFAST, and the open circles to the corrected version of ATLFAST used for the reach analyses.
Figure 11
The 1 fb-1 5-sigma
reach contours for the 4-jet plus
MissingEt analyses with various lepton
requirements for mSUGRA as a function of m_0 and m_1/2
Top: tanbeta=10. Bottom tanbeta=50. The horizontal and curved
grey lines indicate gluino and squark mass contours respectively in steps
of 500
GeV.
Figure 12
The 1 fb-1 5-sigma reach contours for the 0-lepton and 1-lepton plus
MissingEt
analyses with various jet requirements as a function of m_0 and
m_1/2 for the tanbeta=10 mSUGRA scan. The horizontal and curved
grey lines indicate the gluino and squark masses respectively in steps
of 500
GeV.
Figure 13
Reach for the 'random with
constraints' mSUGRA scan
plotted in the (m(squark),m(gluino)) plane. Solid triangles
represent points which are observable (Z_n>5) with 1 fb-1,
while open triangles show points which are not.
Figure 14
The 1 fb-1 reach for NUHM models with 4 jets, 0 or
1 leptons, and
MissingEt. The masses fot NUHM are similar to the ones
shown in Figure 11.
Figure 15
The 1 fb-1 5-sigma reach
contours of the 2-lepton and 3-lepton analyses for the GMSB scan. The
vertical solid and dashed grey lines indicate the gluino and squark
masses respectively in steps of 500
GeV.
Exclusive measurements for SUSY events
Figure 1
Distribution of the invariant mass of same flavour and different flavour lepton pairs
for the SUSY benchmark points and backgrounds after the cuts optimized from
data in the presence of the SU3 signal. The integrated luminosity is 1 fb-1.
Distribution of the invariant mass of same flavour and different flavour lepton pairs
for the SUSY benchmark points and backgrounds after the cuts optimized from
data in the presence of the SU4 signal. The integrated luminosity is 0.5 fb-1.
Figure 2
Distribution of invariant mass after flavour subtraction for the SU3
benchmark point with an integrated luminosity of 1 fb-1. The line
histogram is the Standard Model contribution while the points are
the sum of Standard Model and SUSY contributions. The fitting
function is superimposed and the expeccted position of the endpoit
is indicated by a dashed line.
Distribution of invariant mass after flavour subtraction for the SU4
benchmark point with an integrated luminosity of 0.5 fb-1. The line
histogram is the Standard Model contribution while the points are
the sum of Standard Model and SUSY contributions. The fitting
function is superimposed and the expeccted position of the endpoit
is indicated by a dashed line.
Figure 3
Distribution of invariant mass after flavour subtraction for the SU1
benchmark point with an integrated luminosity of 1 fb-1. The line
histogram is the Standard Model contribution while the points are
the sum of Standard Model and SUSY contributions. The fitting
function is superimposed and the expeccted position of the endpoit
is indicated by a dashed line.
Distribution of invariant mass after flavour subtraction for the SU1
benchmark point with an integrated luminosity of 18 fb-1. The line
histogram is the Standard Model contribution while the points are
the sum of Standard Model and SUSY contributions. The fitting
function is superimposed and the expeccted position of the endpoit
is indicated by a dashed line.
Figure 4
Efficiency-corrected flavour-subtracted distributions of mllq
for SU3 for 1 fb-1 of integrated luminosity. The points with error
bars show SUSY plus Standard Model, the solid histogam shows the
Standard Model contribution alone. The fitted function is superimposed,
the vertical line indicates the theoretical endpoint value.
Efficiency-corrected flavour-subtracted distributions of mllq
for SU4 for 0.5 fb-1 of integrated luminosity. The points with error
bars show SUSY plus Standard Model, the solid histogam shows the
Standard Model contribution alone. The fitted function is superimposed,
the vertical line indicates the theoretical endpoint value.
Efficiency-corrected flavour-subtracted distributions of mllqthr
for SU3 for 1 fb-1 of integrated luminosity. The points with error
bars show SUSY plus Standard Model, the solid histogam shows the
Standard Model contribution alone. The fitted function is superimposed,
the vertical line indicates the theoretical endpoint value.
Efficiency-corrected flavour-subtracted distributions of mllqthr
for SU4 for 0.5 fb-1 of integrated luminosity. The points with error
bars show SUSY plus Standard Model, the solid histogam shows the
Standard Model contribution alone. The fitted function is superimposed,
the vertical line indicates the theoretical endpoint value.
Figure 5
Efficiency-corrected flavour-subtracted distributions of m_lq^high
for SU3 for 1 fb-1 of integrated luminosity. The points with error
bars show SUSY plus Standard Model, the solid histogam shows the
Standard Model contribution alone. The fitted function is superimposed,
the vertical line indicates the theoretical endpoint value.
Efficiency-corrected flavour-subtracted distributions of m_lq^high
for SU4 for 0.5 fb-1 of integrated luminosity. The points with error
bars show SUSY plus Standard Model, the solid histogam shows the
Standard Model contribution alone. The fitted function is superimposed,
the vertical line indicates the theoretical endpoint value.
Efficiency-corrected flavour-subtracted distributions of m_lq^low
for SU3 for 1 fb-1 of integrated luminosity. The points with error
bars show SUSY plus Standard Model, the solid histogam shows the
Standard Model contribution alone. The fitted function is superimposed,
the vertical line indicates the theoretical endpoint value.
Efficiency-corrected flavour-subtracted distributions of m_lq^low
for SU4 for 0.5 fb-1 of integrated luminosity. The points with error
bars show SUSY plus Standard Model, the solid histogam shows the
Standard Model contribution alone. The fitted function is superimposed,
the vertical line indicates the theoretical endpoint value.
Figure 6
Invariant mass distribution of opposite-sign tau pairs with same-sign tau distribution subtracted,
for the SU1 (18 fb-1, left) and SU3 scenarios (1 fb-1, right). The dashed histogram in the left plot shows
the distribution at the generator level, while points show the reconstruction-level distribution.
Figure 7
Calibration curve showing the relation between the position of the inflection point (measured
and fitted with function Eq. (12) after ATLFAST based detector simulation) and the endpoint (calculated
with equation Eq. (5)) of the di-tau mass distribution. The SU3 point is not included.
Figure 8
Di-tau invariant mass spectrum for t! pnt decays as obtained from Monte Carlo truth
information together with the expectation from theory. Right: Di-tau invariant mass spectrum for all
hadronic decays after an ATLFAST based detector simulation. Both plots show the mass distributions
for the chirality states LL, RR and LR=RL.
Figure 9
Fit of the sum of the reconstructed mT2 distributions in the selected SUSY and the remaining
Standard Model background events with 1 fb-1 for SU3 and 0.5 fb-1 for SU4.
Figure 10
Left: Reconstructed mtb distributions in signal and SUSY combinatorial background events.
Right: The 5 parameters fit of the sum of the reconstructed mtb distributions in signal and the remaining
Standard Model events after the subtraction of the SUSY combinatorial background; all at 200 pb-1.
Figure 11
Invariant mass of the selected b-jet pairs (left) and invariant mass of the system consisting of
the Higgs plus the jet minimising mhq (right) for 10 fb-1 of integrated luminosity.
Figure 12
Two-dimensional Markov chain likelihood maps for mSUGRA parameters M0 and M1=2 (left)
as well as tan b and A0 (right) for sign m= +1, for benchmark point SU3, with integrated luminosity of
1 fb-1. The crosses indicate the actual values of the parameters for that benchmark point.
Figure 13
Distributions of the mSUGRA parameters obtained with the fits to pseudo-experiment results.
Searches with three leptons and missing transverse momentum
Figure 1
The SU2 sparticle mass spectrum
Figure 2
The efficiency for electrons (a,b) and muons (c,d) to be reconstructed and to pass various
isolation criteria, for the SU2 sample. The plots are shown as a function of the pT (a,c) and eta (b,d) of
the matched Monte Carlo lepton.
Figure 3
The fake rate for electrons (a,b) and muons (c,d) in the ttbar sample as function of the pT (a,c)
and eta (b,d) of the fake lepton.
Figure 4
Transverse momentum of the leading three leptons (a-c) and leading-jet pT (d) after an initial
three-lepton requirement has made.
Figure 5

(a)

(b)
Track isolation variable (max pT, DR=0.2) for (a) electrons and (b) muons.
Figure 6
(a) OSSF dilepton invariant mass distribution.
(b) ETmiss distribution after the Z mass window cut.
(c) The pT distribution of the leading jet after the ETmiss cut is applied.
Figure 7

(a)

(b)
Distributions of the OSSF dilepton invariant mass after all selections have been applied
(a) without the jet veto and (b) including a jet veto.
Signatures with high-pT photons or long-lived heavy particles.
Figure 2
The g55 event filter trigger efficiency (see text) for the GMSB1 sample as a function of the
reconstructed pT of the leading photon
Figure 3
Distributions after preselection for 1fb-1. Left: Missing transverse energy. Right: Effective
mass for signal and Standard Model background
Figure 4
Distributions after preselection for 1fb-1: Number of reconstructed photons with pT >20
GeV
and |eta| < 2.5 (left) and transverse momentum of the leading photon for signal and Standard Model
background (right)
Figure 5
Signal distributions for full and fast simulation: a) effective mass, b) transverse momentum of
the leading photon
Figure 6
5sigma discovery potential contour lines for GMSB SUSY in the Lambda - tan beta plane for different
integrated luminosities
Figure 8
Left: The distributions of the decaylength of the neutralino in the z direction. Right: The
transverse momentum of the photons they produce
Figure 9
Reconstruction efficiency as a function of Delta eta for the GMSB2 and GMSB3 samples
Figure 10
Photon identification cut efficiencies as a function of neutralino decay length in Z
Figure 11
Fitted slope parameters of the projected intersection distributions versus mean neutralino
lifetime from the custom-built Monte Carlo simulation for an integrated luminosity of 30 fb-1
Figure 12
The measured cluster time as a function of the generated neutralino lifetime, for individual
neutralinos in the Monte Carlo samples
Figure 13
Transverse momentum and velocity spectra for sleptons and accompanying leptons from the
GMSB5 sample
Figure 14
The efficiency, as a function of b , for all slepton hits in the muon trigger chambers to be
included in the same BC with fast particles, for the barrel (right)and the endcap (left)
Figure 15
The beta measured for sleptons in the barrel at L2 for different values of true beta . The error bar
represents the fitted sigma of the measured beta distribution
Figure 16
Mass distribution of signal and background resulting from the L2 selection for an integrated
luminosity of 500 pb-1. The shaded area is the GMSB5 signal, the dashed line is the muon background,
and the full line is the sum
Figure 17
The efficiency to reconstruct sleptons as muons as a function of b for two ATLAS muon
reconstruction packages
Figure 18
beta resolution and reconstructed mass for sleptons from the GMSB5 sample
Figure 20
Distributions of transverse momenta dn / dpT of hard tracks (pT > 50
GeV) as reconstructed in
the ID (left) and muon (right) system. The top, middle, and bottom plots show tracks from R_gluino, R_stop, and
background events, respectively. As labelled, R-hadron spectra are scaled according to R-hadron mass.
The spectra correspond to an equivalent integrated luminosity of 1fb-1
Figure 21
Ratio of the number of high to low threshold hits in the TRT (top left); distance between a
R-hadron candidate and a jet (top right); cosine of the angle between two high pT tracks in the muon
system (bottom left); and cosine of the angle between high pT tracks in the ID and muon systems (bottom
right). Distributions are shown for R_gluino hadrons of mass 1000
GeV and three background sources
Figure 22
Distributions of q(ID) * pT(ID) / q(mu) * pT(mu) for R_gluino (left) and R_stop hadrons (right). Predictions for a range of R-hadron
masses are shown
Major updates:
--
PaulDeJong - 18 Dec 2008
Responsible:
PaulDeJong
Last reviewed by:
Never reviewed