Folded SUSY hep-ph/0609152
description
Transcript of Folded SUSY hep-ph/0609152
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Folded SUSYhep-ph/0609152
idea
Harnik
opposite spin partnersbut gauge quantum numbersmay be different from thoseof conventional superpartners
leads to the idea of quirks: exotic vector-like fermions with a hidden-confining group.M >> . Analogous to QCD with no light quarks
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Hidden valleys
neutralunder
SM group
energeticbarrier
LSsP
v-quark
LSvP
A motivation to lookfor highly displaced
verticesor a large number ofordinary displaced
vertices (b, )
v-hadrons
0604261
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if strong charge R-hadron
time-of-flight ~ 1 ns
resolutionin det.
nuclear interaction model assuming the heavy parton acts as a spectatorpossible charge exchanges
low
CMS:stablegluino
30 pb–1
ATLAS: gluino up to 1 TeV with 100 pb–1
or ionisation in Si trackeror ATLAS TRT
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?SHAFT
CMS
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Lecture 3
ED
Little Higgs
Strong coupling
sampling among a huge number of studiesmany require luminosities well above 10fb–1
back to a model-independant approach
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Extradimensionsthe possibility of compact ED is an old idea, resurrected by SUGRA and Superstrings
it was then realized that the compactification radius can be large ( » 1/MPlanck) or that one can exploit a warped extra space. Thatwould solve (or reinterpret) the hierarchy problem
many possible variants
phenomenology: momentum in ED means mass in 4D. KK-towers of theparticles having access to the bulk
may be accessible at colliders
1 fermi =1/200 MeV
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ADD TeV–1 UED RS1 Bulk RS flat warpedMD= 1TeV =2 ~10–4 fermi R–1<300 GeV warp factor e–kR 410–4 eV 100 1/k: curvature radius R: compactification radius kR ~ 11
only gravity e.g. gauge all SM SM on all in bulk in bulk bosons in bulk in bulk brane
KK-parity
pair creation ew at loop level DM candidate
[mUED]
gravity weakbecause localized
near a brane which is not ours
gravity weakbecause dilutedin the extra dim
(R>>MD-1)
KK graviton-SM coupling ~1/MPl
KK tower nearlycontinuous ~ 2/R
KK graviton
KK gluonKK of SM
gauge bosons,..
KK of SM gauge bosons
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Many possible signatures
Di-leptons, di-jets continuum modifications
Di-leptons, di-jets and di-photonsresonance states
Single jet/single photon + Etmiss
Single lepton + Etmiss
Back-to-back energetic jets + Etmiss
4 jets + 4 leptons + Etmiss
Black holes? Strong gravity?
virtual graviton production inADDblack holes or strong gravitynew particles in RS1 (RS1 graviton) and in TeV–1 extra dimension model (ZKK)
direct graviton productionin ADD
WKK decay in TeV–1 extra dim
UED
UED
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ADD notations
cosmo- and astro-physics bounds (see backup):at least n = 2, 3 are more severely constrained than by LEP/Tevatron
but these bounds disappear if there is no KK graviton lighter than about 100 MeV. Collider experiments mostly probe the heavy graviton modes.
MS
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direct production of graviton
single gamma monojet
signatures
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Single + ETmiss
CMS fight mostly Z
30fb–1
MD=2.5TeV n = 2
30fb–1S
B
significance versus MD
Z
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100 fb-1
ATLAS
jet < 3
Kribs
unparticles
SM
ADDmonojets
Rizzo
signal and background for large ED in ADD, monojet channel
n=2
n=4
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ADD
Graviton exchange
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ATLAS
Mmin: lower cut-offon the di-photon mass
diphotondimuon
1fb–1 n=6 ~ 4 TeV n=3 ~ 5.8 TeV
CMS
MS: theory scale
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TeV-1
flat 10–4 fermi gauge bosons in the bulk
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CMS ee
5 discoveryCMS e
ATLAS
KK Z and W boson
saturation of electronics
4 TeV 6 TeV
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UED
all matter fields in the bulk
R ~ TeV–1
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Basic scheme
momentum conservation in ED KK number conservation pair production. A compactification scale of ~ 300 GeV satisfies electroweak constraints
at tree level, all first excitations degenerate in mass at 1/R (+ Higgs effect) pair production as S
2 (+ kinematics) if degeneracies, stable or long lived states
loop corrections lift the degeneracy radiative corrections imply a cut-off scale To avoid unitarity violation, R not too large: R =20 ? then model-dependent spectrum.
much like Rp SUSY, except spins, existence of a 2nd excitation, etc
0510418
KK pairs at LHC
total
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one-loop corrected, 1/R=500 GeV, R=20, mh=120 GeV
model-dependent spectrum typically: g* + 30% q* + 20% W* Z* l* * + few % LKP is *, close to 1/R
chain decay to LKP not very hard products focus on leptons
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four leptons + ETmiss from one UED Les Houches 07
DM limits: 0206071inverse problem? study dilepton spectrummore than one UED?
M.Gigg and P.Ribeiro
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Fat brane variant
all ED large (cf ADD), but matter confined to 1/M of 4D brane (fat brane)
momentum conservation in 5D does not hold extra momentum associated to graviton emission picked up by the brane KK number conservation does not hold anymore
Gravity-matter interaction: gravity-mediated decay can compete or dominate
phenomenology: single KK excitations
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0510418
2 4
6
E of graviton radiated
1 TeV
Di-jet + missing ET
2
6
Di-photon + missing ET reach for 20 and 100 evts
26
UED
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WARPED ED AdS/CFT correspondance
General idea
Randall-Sundrum 1: all SM on the branephenomenology: KK graviton, radion
problems
Bulk Randall-Sundrum: all SM in the bulkKK recurrences of SM electroweak constraintspromises and problems
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slice of a 5-dim anti-de Sitter space, AdS5 5D cosmological constant , 5D Planck scale Mmetric ds2 = e–2ky dx dx – dy2
y is the coordinate of the 5th dimension k is the curvature of AdS = sqrt(–) the extra dimension has the geometry of the orbifold S1/Z2 i.e. segment of length L M ~ k ~ MPl if kL ~ 30, e–2kL MPl ~ 1 TeV L is not a large ED, inverse size ~ GUT scale
L
parameters: k M Llow energy effective theory:k, 1/L << M c = k/M < 0.1KK gravitons mass split ~ 1 TeVdecay in dileptons, dibosons(BR to = 2 BR to ll), dijetsmaller c narrower resonance
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RS1
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10fb-1100fb-1
excluded: above, left
no new scalebetween ew and 10 TeV
Z’ graviton
cos
c
c
c
10fb–1
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radion
Scalar field corresponding to an overall dilatation of the EDIts value controls the size of the EDPerhaps the lightest BSM particle in this scenario
Coupling near the weak scale
Similar, but not identical, to the Higgs boson. Gluophilic.
Can mix with the Higgs
see back up
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Bulk Randall-Sundrum
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Bulk RS models
good features
bad features
main targets: lightest KK partner of graviton gluon * electroweak bosons top *
experimental problem of boosted top
should one invent the Little RS?
elementary composite
c = 0.5 flat fermionc > 0.5 closer to Planck
ex. fermions: e(0.5-c)ky
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KK graviton
is the hope in RS1
in bulk RS, light quarks near UV brane, tR very near the TeV brane. The KK graviton is also localized near the TeV brane.
due to overlap of the wave functions in the ED expect: a (small) production through gluon annihilation decay into H, W, Z, top and other KK states
see back up beware: 100fb-1, perfect top tagging
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a glimpse at KK gluon
B.Lillie, L.Randall, L.T.Wang 0701166G.Perez, MC4BSM
K.Agashe et al 0701166
mind: 100fb-1, perfect top tagging!
no more early BSM!
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/M=0.17
100fb-1
pb/GeV100 fb
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Identification of narrow energetic top
needed for many physics channels
not for the early days, but learn how to do
focus on hadronic top
decay products highly collimated
S/B before b-tag ~ 1/165one b-tag not enough
study substructure of top and QCD jet
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KK gauge bosons 0706.4191
see back up
RS with L-R structure specific charges of the new abelian group and specific fermion localizations, to solve AFB
b anomaly
mKK of 3 TeV
complete study of DY, gg fusion, associated production at LHC
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Gauge-Higgs or Higgs as Goldstone boson in warped space
partners of top
Higgs phenomenology?
0712.0095
0801.1679 *
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T5/3
the “custodian”
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Strong dynamics realized by the bulk of an extra dimension. custodial symmetry GC=SU(2)C include a LR parity GC=SU(2)C PLR
The heavy partners ot (tL,bL) can fill a (2,2)2/3 representation. Two SU(2)L doublets. One (T,B) has the quantum numbers of (tL,bL). The other (“custodian”) is made of T5/3 and T2/3
These new fermions are expected to couple strongly to the 3rd generation quark plus a longitudinal W, Z or the Higgs (e.g. tW)
Pair produced by QCD. Single production and decay from the above couplings. Here pair production of B and T5/3 and final state involving same-sign dileptons
0801.1679
four W
Contino, Servant
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1pb
theoristanalysis
earlyphysics?
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Transplanckian
May be early physics. But what to look for?
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0708.3017TeV gravity?
xmin ? thermality semiclassical approx. applicable inelasticity: initial state radiation
fb
MD
ADD n=6
RS
xmin
=1 to 6
limited entropy
0.1fb
MD
RS
ADD
2
≥6
consider two-bodyfinal statecf. compositeness search
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Unparticleswhy here? conjecture
mass spectrum continuous or all masses equal to zeroscale invariance manifestly broken at tree level in SM
dilatation generator D
an operator with general non-integral scale dimension dU in a scale invariant sector looks like dU invisible massless particles
?
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0706.3152
Drell-Yan at Tevatron
Limits from LEP
monojets at LHC
others:Higgs,WW?
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Little Higgs
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THE LITTLE HIGGS MODEL
solves the “small hierarchy problem”ensure compensations between particles of the same type
must invent a number of new particles in the TeV mass range
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Littlest Higgs
hep-ph/0206021hep-ph/0512128
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break global symmetry by gauging
gauged generators
non-linear -model, in terms of
pion matrixsubgroup of SU(5)
f ~ 1 TeVglobal
vacuumcondensate
24 –10 = 14 broken generators, and thus 14 NGB fields
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top partners
the model 0512128, 0703138
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more simply:
the “pion” matrix
14 NGB
absorbedby heavy B
physical,massless
hypercharges
Higgs
triplet
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NORMAL LH (WITHOUT T)
heavy gauge bosons 0512128
T quark*
back up
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Littlest Higgs, ATLASSearch for T
single dominates
No account of electroweak constraints
in Lt (generating the Yukawa coupling) two couplings 1 and 2
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T Wb
BR=50%
T ht
BR=25%Zt pair, from l+l–l±b
0402037
1/2=1BR=25%
300 fb–1
1 TeV
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but.... finetuning
T-parity
mh
=10TeV
(=cos’)
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allows for a heavy Higgs
provides the LTP, heavy photon as a good candidate for DM
satisfies e.w. measurements
The Littlest T-parity Higgs (LHT)
see back up
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f=1TeV
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LHT SEARCHES
Doubly-charged Higgs*T-quarks, 0610156 (back up)T-odd gauge bosons, triplet Higgs, 0411264T-even and T-odd partners of top, 0301040, 0310039, 0411264
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CMS,TDR
M.Muhlleitner, M.Spira hep-ph/0305288
100% in 4 muons
role of triplet inneutrino masses?, , ~ 1/3
fb
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Hubisz,MeadeT-odd phenomenology at LHC
COMPHEP
f
1fb
fZHAHh WHAHW
++W+WH+
+ W+AH
0 ZAH
P HAH
WHZH
WHAH
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Hubisz-Meade 0411264T-odd partner of top, t’– , lighter than t’+
mt’–
mt’– / mt’+
t’+ singly
produced, with jet
t’– tAH
pair t t + ETmiss
1fb
t’+
t’–
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Pair production of heavy gauge bosons
Z invisible
10–2 pb
very difficult
about size of signal
too difficult
O(pb)
10–3 pb Z invisible
Prospects for LHT
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10–4pb
10–6pb
T’– most interesting but
T’+ same as without T- parity except presence of T’–
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LHC inverse problem
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Hadronically quiet 3l in LHT
WHZH versus 010
2
with matched spectra
3l + ETmiss
clear excess in LHT more usable if sleptons are lighter than gauginos
300fb–1
0708.1912
SM backgroundmore study needed...
l, q
l=0.4 q =1.0
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Technicolor
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TECHNICOLOR
sensitive tothe number of fermions
resurrected from the deadsby “agnostism”?by AdS/CFT duality?
small T (1) respect custodial symmetry, implies RH resonancessmall S (3) degenerate V and A spectra, or no coupling ofheavy resonances to light fermions, VBF preferred
3
1
SU(N)technicolour
technifermion flavors
infrared below ETC
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Low scale TC at LHC?
agnosticism?
K.Lane
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aTT T
20fb–1 40fb–1
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Walking TechnicolorBetter than “running”
Minimal Walking Technicolor Sannino, Foadi et al
small S
under study
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HIGGSLESS
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Birkedal-Matchev 0508185
saturation limit, only first V
i: KK level in 5D or label of mass eigenstates in 4D deconstructed
Sum rules
Higgsless
WW elastic scattering
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10fb-1, test up to 550 GeV
WW probably impossible
Only VBF considered
WZ in 2J 3l ETmiss
WZ elastic scattering500 GeV MVB
production at LHC
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Minimal Higgsless Model
Dimensional deconstruction, 3-sites, 5D SU(2)x SU(2)xU(1)Gauge + Goldstone sector has 5 parameters with 2 constraintsA single pair of W’ and Z’ heavy vector bosonsConsistant with all precision dataFermion sector theoretically important, with “ideal fermion delocalization”, buthighly suppressed SM fermions coupling to W’, Z? heavy fermions >1.8 TeV
Focus on W’ production
0711.1919Belyaev
3l jj 4l 2jets
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arXiv:0708.2588
MT(WZ) 3l +
theorist’s analysis
100fb-1
integratedluminosityneeded
transverse mass
jacobian peaks
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Higgsless, WZ channel
2 leptonchannel
jjll
3 leptonchannel 300 fb-1
lll
Les Houches 05, Azuelos
700 GeV resonance from a Higgsless model
+ 2 jetsforward
300fb–1
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Back to agnostism
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BSM
“peaks” will be relatively easy to find
shape modifications more difficult
level changes very difficult
the answer on a large part of what we reviewed is not to be expected fast
Pure guess: 2008 ≤ 10pb–1
2009 ~ 1 fb–1
2010 ~ 10 fb–1
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important to come to LHC physics without any intellectual bias
on the other hand the scan of a large variety of possible models was essential and should go on ex. unparticles phenomenology
enormous work to get the detectors ready: “technical tasks”(alignment, calibration, energy scales) should be made as rewarding as physics analyses
besides considering physics topics, one should first focus on various promising final state topologies and master them
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topologies
Les Houches 2007
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0710.2378topological approach
Searches at HERAand Tevatron
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From a signal to the identification of the relevant BSM scenario?
experimentally: “signature” of the signaln leptons (signs) + m photons + p jets + ....
theoretically:“typology” of the scenarioex. SUGRA0802.4085
or “simplified” version of new physicsex. MARMOSEThep-ph/0703088
characterization of the new physics in terms of new particle masses, production cross-sections and branching ratios, as a crucial intermediate step
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efficiencies from data(redundancy)
e.g. soft leptons
high level trigger menu of CMS (2 1033)
name it, they have it or don’t they?
100Hz
tens of millions ofcosmic triggers taken
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D.Acosta
extensive data challenges performed
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GLIMPSE AT LHC PHYSICS
1/ re-discover the SM 2/ establish the existence of signals BSM, if any3/ find out what they are: the LHC “inverse problem”
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Heavy ions,presto
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Heavy ionsSPS: strangeness enhancement, J/ suppression.RHIC: increase in elliptic flow, high–Pt particle suppressionLHC offers much higher E. Matter in QGP phase will be hotter, bigger, longer-lived. Much smaller x involved: RHIC forward region (showing SF saturation) will move to mid-rapidity at LHC. Much harder processes accessible.Experimentally 3 orders of magnitude lower rates, up to 3 orders of magnitude higher particle densities.Jet quenching: hard parton loss of energy due to gluon bremss. But actually medium-induced redistribution of the jet energy inside the jet cone, i.e. calorimetric measurement unsufficient, one needs to see the modification of jet characteristics, requiring track reconstruction and identification down to low momenta, etc.Heavy flavour production: suppression pattern of quarkonia , . One must measure open heavy flavour production as normalization. So cover low Pt region, low decay background, IP resol., particle id.
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ALICE
-6
-4
-3
-2
-1
0
1
2
3
4
90o 180o 270o 360o
Rapidity
Azimuth
FMD -5.4 < < -1.6
PMD -2.3 < < -3.5
FMD 1.6 < < 3
Muon arm 2.4 < < 4
ITS+TPC+TRD+TOF: -0.9 < < 0.9
ITS multiplicity -2 < < 2
HMPID -.45 < < 0.45
Δφ = 57ο
PHOS -.12 < < 0.12
Δφ = 100ο-6
-4
-3
-2
-1
0
1
2
3
4
90o 180o 270o 360o
Rapidity
Azimuth
FMD -5.4 < < -1.6
PMD -2.3 < < -3.5
FMD 1.6 < < 3
Muon arm 2.4 < < 4
ITS+TPC+TRD+TOF: -0.9 < < 0.9
ITS multiplicity -2 < < 2
HMPID -.45 < < 0.45
Δφ = 57ο
PHOS -.12 < < 0.12
Δφ = 100ο
TPC l, = 5m 6 105 el. channels i.e. 15 ALEPH 88 m3