Squarks up to 202
GeV- M. Antonelli
189 selections used,
but reoptimised at 196,200,202. New efficiency paramterizations.
obs exp
results:
stop->charm neutralino
L-deltam 2 1.8
H-deltam 8 6.3
stop->bottom-lepton neutrino L-deltam
4 1.7
H-deltam 0 1.1
sbottom->bottom neutralino L-deltam
1 0.9
H-deltam 2 1.8
mass limits improve
2-5 GeV. Excess
of low mvis/elep events, need to investigate GRC4F W e nu MC.
Slepton up to 202 GeV-
Karl Jakobs for Frank Holldorfer
last years cuts scaled
by energy, use last years E12 inefficiency.
ee
38 obs / 45.8 exp
mumu
39 obs / 41.2 exp
tautau
41 obs / 32.8 exp
the usual excess for
staus, limits improve (not much for staus).
charginos up to 202
GeV -Paolo Azzurri
Standard analysis
applied on new data:
high sfermion masses low sfermion
masses
7 obs/ 12.1 exp 22 obs/32.3 exp
Lack of events compared
to expectation. E12 distributions measured on random trigger for this year,
quite similar to last year. Charginos excluded up to kinematic limit.
neutralinos up to 202
GeV- Fabiola Gianotti
dominant decay:
neutralino_2->Z* neutralino->acoplanar jets
obs exp
delta_m<15
AJ-L
0 0.5
15<delta_m<25
AJ-L.or.AJ-H 3
1
25<delta_m<45
AJ-H
6 1
Excess of events in
AJ-H (similar selection to stop->charm neutralino),
2 events at 196, 2
events at 200, 2 events at 202.
2 events are close
to the anti gamma-gamma cuts.
Emiss of candidates
150-180 GeV. Dominant background is W e nu. Need to compare GRC4F
with PYTHIA. Indirect limit on chargino mass up to about 105 GeV, a gain
of 3-5 GeV wrt Tampere. The combined limit on the neutralino mass from
the charginos and neutralinos is 36.5 geV
(m0=500 GeV).
Single and Multi-photon
events- Gary Taylor
Problem in data for
ECAL module 25.
Two photon+ missing
energy:
obs exp
preselection
34 35
neutralino LSP
9 11
GLSP
3 2.1
Photon+missing energy:
584 obs/591 exp,
3 events with missing mass less than 60 GeV.
2 of the events are
in cracks and have poor resolution.
M_gravitino > 1.1
x 10-5 eV
Extra dimensions
n=2 Md>1110 GeV
n=3 md>860 GeV
Non-pointing photons:
0 obs/0.5 exp
two photons: 1599 obs/1632
exp
extra dimensions:
lambda_T(+)>987 GeV
lambda_T(-)>866 GeV
excited electron:
m_e*>371 GeV
stable sleptons up
to 202 GeV- Fabio Cerutti
Data quality 192-196
GeV ok. For 200-202 GeV shift (2.7%) in P(+)-P(-)/E_beam, probably due
residual effects after fix for TPC short.
0
obs/ 0.6 exp
Last years limit on M_stau improves 5 GeV to 93.5 GeV.
Long lived sleptons
up to 202 GeV- Chris Booth
Kinks selection modified
to require at least one VDET or TPC hit on inner track- reduces efficiency
69->64%. Need to show on MC that tighter selection is justified.
1 event found
in data, a single track with kink and em energy close by. Probably
bhabha with 1 electron in detector (which radiates to give kink)
and other at low angle. Standard model backgrounds
0.58 events, limit on gamma-gamma background
uncertain due to lack of Monte Carlo. Mass limits around 88-90
GeV.
R-Parity Violation
via UDD- Dominique Fouchez
same selections as
189 GeV:
obs exp
4jets
838 896
4jets-broad 165
173.6
multijets
17 11.9
multijets+lepton 39
26.8
4jets+2lepton 8
6.7
multijets+2lepton 8
9.8
4jets+emiss 114
98.4
multijets+emiss 168 155.2
Due to small
excesses in multijets channels, the limit on the chargino mass is a bit
below the kinematic limit (>99 GeV).
The neutralino mass peak observed in the sneutrino analysis at the time
of Siena, is not confirmed with the new data. Using the GRC4F monte carlo
rather than PYTHIA reduced (not increased) the background estimate around
the peak.
R-Parity Violation
via LLE/LQD- David Hutchcroft
LLE selections:
obs exp
leptons+hadrons 10
11.2
4 leptons
10 5.1
2 leptons+2 taus 1
2.5
4 taus
5 5.4
ee+emu+mumu
151 174
ee+etau+tautau 96
109
mumu+mutau+tautau 75 108
LQD selections:
multijets+leptons
14 13.9
2 jets+2 taus
13 15.0
2 jets+Emiss
27 20.1
4 jets
899 999.8
Excess in 4 leptons
but no mass peaks-so not sneutrino. One event
(run52125/evt9969)
looks like a zz->4 mu. The 2 jets+emiss selection is similar to the acoplanar
jets of RPC neutralinos and as for that case an excess is observed. The
chargino mass limit is essentially at the kinematic limit for both LLE
and LQD. Mass limits for sleptons, squarks, sneutrinos all improve.
Single sneutrino via
LLE up to 202 GeV- Chris Curtil
The analysis searching
for photoproduction of a single sneutrino via LLE has been updated. A cross-section
of 0.06pb is excluded for all sneutrino masses decaying via lambda_1j2.
The existing low energy limits on lambda_1j2 are improved for masses below
160 GeV.