20 july 2000w.murray1 delphi status or... should we extend the run? lepc july 2000
TRANSCRIPT
20 July 2000 W.Murray 1
DELPHI Status
Or...
Should we extend the run?
LEPC July LEPC July 20002000
20 July 2000 W.Murray 2
Talk Overview
• Data taking efficiency and Detector performance
• Standard model results
• Searches– Supersymmetry
– Exotica
– Higgs (& ZZ production!)
• Conclusions
20 July 2000 W.Murray 3
Performance of DELPHI• Efficiency good,
average 93.3%
• 112.4pb-1 recorded on 20th July– Includes 2.2pb-1
recorded outside declared physics
• Congratulations to the pit team
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20 July 2000 W.Murray 4
TPC Voltage problems• HV problems:
– wire slack in sector 6 of 12
• Each trip requires new working point,– ~10 Trips so far
– We ran OK for 1 month
• Sense wire voltage now reduced from 1435V to 1410V
20 July 2000 W.Murray 5
TPC sector 6• 1/12 running at reduced
voltage, gain 40%
• Some compensation with shaper settings– DeDx distorted
– Z0 run shows efficiency
OK
• TPC experts suffering more than the data so far
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Current runningCurrent running
20 July 2000 W.Murray 6
VD performance• No new problems
in vertex detector• Resolution as
good as ever• 10-20m motion
being tracked.– We welcome the
Z0’s in September
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20 July 2000 W.Murray 7
S/
distribution
L=87.75pb-1
• qq centre of mass energy/ECM, estimated from jet angles
• Agreement with PYTHIA 6125
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20 July 2000 W.Murray 8
Two Fermion ProductionTitle:xsec_all_had_el_mu_tau.ps (Portrait A 4)Creator:HIGZ Version 1.26/04Preview:This EPS picture was not savedwith a preview included in it.Comment:This EPS picture will print to aPostScript printer, but not toother types of printers.
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20 July 2000 W.Murray 9
B tagging cross-check
• Z resonance data well described
• Semileptonic WW sample also OK
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Light quarks
b quarks
Non-WW
20 July 2000 W.Murray 10
Rb measurement
Y2KY2K
Acts as a Acts as a check on check on
high-energy high-energy datadata
Agrees with Agrees with ZfitterZfitter
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20 July 2000 W.Murray 11
W mass MeasurementTitle:/_/del/jdhondt/kumac/spec2000.epsCreator:HIGZ Version 1.25/05Preview:This EPS picture was not savedwith a preview included in it.Comment:This EPS picture will print to aPostScript printer, but not toother types of printers.
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4 jets
qqe
ExcExcelleellentnt
20 July 2000 W.Murray 12
WW cross-sectionTitle:/afs/cern.ch/user/c/chierici/sigww/osaka.epsCreator:HIGZ Version 1.26/04Preview:This EPS picture was not savedwith a preview included in it.Comment:This EPS picture will print to aPostScript printer, but not toother types of printers.
2 0 4 . 8 4G e V
L u m i n o s i t y ,p b - 1
M e a s u r e d R a c o o n /Y F S
q q q q 5 6 . 6 3 49.030.9 7 . 8 0
q q l 5 0 . 0 9 55.044.7 7 . 5 1
l l 5 0 . 0 9 25.086.1 1 . 8 0
2 0 6 . 7 2G e V
L u m i n o s i t y ,p b - 1
M e a s u r e d R a c o o n /Y F S
q q q q 2 9 . 1 1 61.086.6 7 . 8 0
q q l 2 6 . 6 9 83.095.8 7 . 5 1
l l 2 6 . 6 9 32.047.1 1 . 8 0
Channel details:
20 July 2000 W.Murray 13
Searches
• SUSY- aperitif
• Exotica - entrée
• Higgs - dessert
20 July 2000 W.Murray 14
Single and acoplanar photonsTitle:/afs/cern.ch/user/d/demin/gamma/d208g2_rec.ps (Portrait A 4)Creator:HIGZ Version 1.26/04Preview:This EPS picture was not savedwith a preview included in it.Comment:This EPS picture will print to aPostScript printer, but not toother types of printers.
Expected Observed
2000, 90pb-1 7.8 6
130-208 GeV 52.6 56
Expected Observed
2000, 93pb-1 208 218
192-208 GeV 757 758
20 July 2000 W.Murray 15
Search for
and
ee:ee: 27.7 exp,27.7 exp,
26 obs26 obs..
:: 23.0 exp,23.0 exp,
28 obs28 obs..
qq:qq: 29.1 exp,29.1 exp,
24 obs24 obs..
94.2pb94.2pb-1-1Title:xsec_205_ee.epsCreator:HIGZ Version 1.26/04Preview:This EPS picture was not savedwith a preview included in it.Comment:This EPS picture will print to aPostScript printer, but not toother types of printers.
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*01
02 Z Model independent limitsModel independent limits
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Title:
Creator:
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Search for production
Jet-l ll jet-jet Rad Total
Back 96.128.001.3
6.31.22.65
15.277.084.18
96.131.030.4
0.53.23.91
Data 3 66 23 4 96
*011 W
Topolgies studied:Topolgies studied:
llqq, lqq, lll qqqq & radiative qqqq & radiative
tan tan >= 1 >= 1
20 July 2000 W.Murray 17
Search for productionTitle:
Creator:
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Not allowed Not allowed with tanwith tan>=1>=1
Charginos Charginos excluded to excluded to
kinematic limitkinematic limit
>102.2GeV/c>102.2GeV/c22
forforM>10GeV/cM>10GeV/c22
20 July 2000 W.Murray 18
LSP mass limitUsing 0 and limits up to
2000, DELPHI can exclude LSP below
38.2GeV/c2
Limit at tan =1, and assuming
GUT gauge mass relation.
If Higgs 0.8 - 2.0 tan exclusion
applied, we get:
49GeV/c2 tan above 2.0
42GeV/c2 tan below 0.8
- Assumes mt=175GeV/c2
and m0 < 1TeV
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20 July 2000 W.Murray 19
Squark searches
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S t o p M C D a t a M > 3 0 41.046.4 6 M < 3 0 22.047.1 0
S b o t t o m M C D a t a M > 3 0 37.042.3 4 M < 3 0 22.088.0 0
0~ b
961
~ b
M
68~ b
831
~ b
M
0t 951~ tM
56~ t 911~ tM
M>15GeV/c2
100%Br.
L91.4pb-1
20 July 2000 W.Murray 20
Search for sleptonsTitle:selec183to205.pslb (Portrait A 4)Creator:HIGZ Version 1.23/09Preview:This EPS picture was not savedwith a preview included in it.Comment:This EPS picture will print to aPostScript printer, but not toother types of printers.
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93.7pb-1
2~ /89 cGeVM
2~ /90 cGeVM e
Assume lAssume lll
inaccessibleinaccessible
Results Exp. Obs.
e~ 23.57 22
~ 7.58 4
=-200
tan = 1.5
For For M>5GeV/cM>5GeV/c22
=-200
tan = 1.5
ObservedObserved
ExpectedExpected
20 July 2000 W.Murray 21
Stau status• Stau results at
Moriond interesting
93.7pb-1 @205:
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ResultsExp.Obs.
~19.6618
m > 68GeV/c2
See Alberto DeMin’s talk
=-200
tan = 1.5
20 July 2000 W.Murray 22
GMSB searches
Limit on GMSB at least SUGRA level
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G~~
Expected Observed
KinkSearch
25.018.001.1
1
Large IP 23.014.010.1
1
~
20 July 2000 W.Murray 23
RPV UDD 01 and +
1
Direct to qqqMass window Back. Data
Low 20.7+-0.6 24
Medium 18
High 9.9+-0.6 8
Indirect to qqqqqMass window Back. Data
Low 88.0+-1.6 67
High 15.7+-0.7 18
101.101.7pb-1-1
MM++11>102GeV/c>102GeV/c22
MM0011>37.5GeV/c>37.5GeV/c22
20 July 2000 W.Murray 24
Exotica
Technicolour
Excited leptons
Flavour changing neutral currentsFlavour changing neutral currents
Contact Interactions
20 July 2000 W.Murray 25
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e+e- to
Data corrected to Born level
Limits, combined with other data:
+ >342GeV
- >319GeV
e*>323GeV
for =1
20 July 2000 W.Murray 26
Excited leptons• Nice Candidate
for * production– * decay to
E=103GeV, p=103GeV,0.175GeV
M o d e e
ll * 6 7 / 7 2 2 6 / 2 7 5 1 / 6 4
Wl * 2 3 / 1 6 1 7 / 1 3 7 / 2
lZl * 5 7 / 5 8 4 1 / 2 6 3 2 / 3 9 *
l 1 . 2 / 3lWl * 2 0 / 1 5 1 4 / 1 2 1 3 / 1 2
Z * 5 / 5
20 July 2000 W.Murray 27
Excited leptons
L=90.2pb-1
• No sign of a significant excess
• Limits for f=f/ and f=-f/
• e* also combined with study
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20 July 2000 W.Murray 28
Technicolo(u)r• Similar to Hqq;
different mass pairing & 5C fit
• Small excess, nothing striking
))(( bcbcee TTT Title:meq_tc_1999_2000.epsCreator:HIGZ Version 1.26/04Preview:This EPS picture was not savedwith a preview included in it.Comment:This EPS picture will print to aPostScript printer, but not toother types of printers.
Expected Obs
22.6 24
100.7pb-1
20 July 2000 W.Murray 29
T, T limits
• Couplings depend upon ND, number of doublets
• Contours give exclusion for specific ND, solid for all ND
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For any ND
))(( bcbcTTT ))(( bclW TT
Combine:
20 July 2000 W.Murray 30
FCNC Single top search
• Gives limits on z
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ctzee /
Expected Observed3.3 4
qbqbWt
20 July 2000 W.Murray 31
The main goal of the 2000 run
Invisible, Fermophobic
Charged
ZZ production
Standard Model
MSSM hA
Higgs searches
See Alex See Alex Read’s talkRead’s talk
20 July 2000 W.Murray 32
Invisible HiggsTitle:hqq-ida3.epsCreator:HIGZ Version 1.26/04Preview:This EPS picture was not savedwith a preview included in it.Comment:This EPS picture will print to aPostScript printer, but not toother types of printers.
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Lumi Expected Observed
qq 71.5 8.8 9
73.7 2.2 0
e+e- 73.7 2.3 2
73.7 4.3 5
MH>104.3GeV/c2
107.0 expected
Assuming H to invisible 100%
eeeeqqqq
20 July 2000 W.Murray 33
Fermiophobic Higgs to
L=102pb-1
MH>112GeV/c2
For 100% Br to
MH>97GeV/c2
For SM Br to
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100%
SM Br
20 July 2000 W.Murray 34
ZZ productionTitle:/afs/cern.ch/user/i/ivanvulp/skelana/zzhz/output/pzCreator:HIGZ Version 1.26/04Preview:This EPS picture was not savedwith a preview included in it.Comment:This EPS picture will print to aPostScript printer, but not toother types of printers.
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ZZ to llqq
Good description of data
ZZ to bbqq
Small excess of events
20 July 2000 W.Murray 35
ZZ Cross-sectionL= 92.0-96.9pb-1 (channel
dependent)
• 2 ECM bins:– 204.9GeV (67%)– 206.8GeV (33%)
1.06pb predicted
ECM qqqq qqll qq llll +ll
Total
204.9 51.092.1 41.075.0 60.091.0 72.150.0 31.028.1
206.8 65.048.1 60.080.0 86.011.1 04.200.0 40.011.1
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20 July 2000 W.Murray 36
H+H- results74pb-1 analysed
E v e n t s E x p e c t e d O b s e r v e d
scsc 1 2 7 .2 1 4 7
sc 7 2 .5 5 9
8 .8 1 2
Limits Expected Observed
100% 76.5 76.3
0% 86.5 85.0
Any 74.4 75.0
20 July 2000 W.Murray 37
Hll search
• 1 candidate in , compatible with ZZ
• no good candidates in ee
HH
20 July 2000 W.Murray 38
Searches with ’s
• Consistent with expectations
20 July 2000 W.Murray 39
Hchannel• Sensitive to
high-mass due to WW fusion
• Slight deficit of candidates– Consistent with
background
• Final event has high mass!
20 July 2000 W.Murray 40
Hcandidate
• Mass 111GeV/c2
• B tagged rather strongly
• A reasonable candidate– possibly qq
20 July 2000 W.Murray 41
Hqq search• Some excess seen• No Golden
candidate• Several bronze
• Events peak around 107GeV/c2
20 July 2000 W.Murray 42
Hqq candidate
•Mass estimate 105.5GeV/c2
•Two b-tagged jets
•A reasonable candidate
20 July 2000 W.Murray 43
HZ Mass distribution• Some excess at
high mass • But partially
compensated by 1999 data
MH>109.0GeV/c2
(109.2 expected)96.9pb-1 Hll ’s H Hqq Total
ExpectedObserved
1.21
3.63
2.41
2.86
10.011
20 July 2000 W.Murray 44
hA search• Small excess in bbbb
channel.
• Correlated with ZZ, HZ, Technicolour
• Not very significant
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bbbb search
20 July 2000 W.Murray 45
MSSM Higgs limits
Since 1999:– gain of 1.2 GeV in expected limits – loss of 0.5-1 GeV in observed
due to the excess in 4b's
• tan between 0.8 and 2.0 is excluded in the pessimistic ‘mh-max’ scenario for mtop=175
• tan range is 0.6 to 4.2 in the ‘no mixing’ scenario
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Lim Median ObsMh 87.0 85.1MA 88.5 86.7
20 July 2000 W.Murray 46
Summary
• DELPHI performance is good and well understood• Standard model physics processes normal
• No significant signals observed
Our thanks to all the LEP team
20 July 2000 W.Murray 47
Running Request
• To accumulate, as soon as possible, 10pb-1 at the highest possible energy. Presently this seems to be feasible running with the 2*2 scheme.
• In September evaluate the possibility to achieve a three sigma Higgs discovery and continue to run until it is excluded that it can be reached before Christmas. Depending upon the conclusion:
a Use the reserve weeks to possibly run at higher energy by going to negative frequency shift (possibly compromising the detector backgrounds) and thus gaining 500MeV ECM
b Support a dedicated run at the W mass threshold in order to provide a competitive and independent measurement of the mass of the W. This run should aim to collect 200pb-1 before Christmas.