Download - DELPHI Status
![Page 1: DELPHI Status](https://reader036.vdocument.in/reader036/viewer/2022062723/56813fe9550346895daade76/html5/thumbnails/1.jpg)
20 July 2000 W.Murray 1
DELPHI Status
Or...
Should we extend the run?
LEPC July LEPC July 20002000
![Page 2: DELPHI Status](https://reader036.vdocument.in/reader036/viewer/2022062723/56813fe9550346895daade76/html5/thumbnails/2.jpg)
20 July 2000 W.Murray 2
Talk Overview
• Data taking efficiency and Detector performance
• Standard model results
• Searches– Supersymmetry
– Exotica
– Higgs (& ZZ production!)
• Conclusions
![Page 3: DELPHI Status](https://reader036.vdocument.in/reader036/viewer/2022062723/56813fe9550346895daade76/html5/thumbnails/3.jpg)
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
Title:DELPHI$WWW:[PRIVATE.DAS.RUNNING]FILL_FULL.PS;18 (Portrait A 4)Creator:HIGZ Version 1.21/10Preview: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.
![Page 4: DELPHI Status](https://reader036.vdocument.in/reader036/viewer/2022062723/56813fe9550346895daade76/html5/thumbnails/4.jpg)
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
![Page 5: DELPHI Status](https://reader036.vdocument.in/reader036/viewer/2022062723/56813fe9550346895daade76/html5/thumbnails/5.jpg)
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
Title:/afs/cern.ch/user/a/arnoud/public/tpc/distorsions/eCreator: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.
Current runningCurrent running
![Page 6: DELPHI Status](https://reader036.vdocument.in/reader036/viewer/2022062723/56813fe9550346895daade76/html5/thumbnails/6.jpg)
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
Title:effvd_a0b_rphihe.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.
![Page 7: DELPHI Status](https://reader036.vdocument.in/reader036/viewer/2022062723/56813fe9550346895daade76/html5/thumbnails/7.jpg)
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
Title:/delphi9/dellaric/work/lep_all/sprime_plots_ecms_20 (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.
![Page 8: DELPHI Status](https://reader036.vdocument.in/reader036/viewer/2022062723/56813fe9550346895daade76/html5/thumbnails/8.jpg)
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.
Title:asy_all_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.
![Page 9: DELPHI Status](https://reader036.vdocument.in/reader036/viewer/2022062723/56813fe9550346895daade76/html5/thumbnails/9.jpg)
20 July 2000 W.Murray 9
B tagging cross-check
• Z resonance data well described
• Semileptonic WW sample also OK
Title:/afs/cern.ch/delphi/scratch3/b/borisov/lepc-1.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.
Title:/afs/cern.ch/delphi/scratch3/b/borisov/lepc-2.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.
Light quarks
b quarks
Non-WW
![Page 10: DELPHI Status](https://reader036.vdocument.in/reader036/viewer/2022062723/56813fe9550346895daade76/html5/thumbnails/10.jpg)
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
Title:TMP:[LIEBIG.PLOTS]RB_RESULTS_COLOUR_HE-ONLY.PS;2 (Portrait A 4)Creator: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.
![Page 11: DELPHI Status](https://reader036.vdocument.in/reader036/viewer/2022062723/56813fe9550346895daade76/html5/thumbnails/11.jpg)
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.
Title:/afs/cern.ch/user/j/jeans/massplot_new.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.
Title:/afs/cern.ch/user/j/jeans/massplot_new.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.
Title:/afs/cern.ch/user/j/jeans/massplot_new.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.
4 jets
qqe
ExcExcelleellentnt
![Page 12: DELPHI Status](https://reader036.vdocument.in/reader036/viewer/2022062723/56813fe9550346895daade76/html5/thumbnails/12.jpg)
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:
![Page 13: DELPHI Status](https://reader036.vdocument.in/reader036/viewer/2022062723/56813fe9550346895daade76/html5/thumbnails/13.jpg)
20 July 2000 W.Murray 13
Searches
• SUSY- aperitif
• Exotica - entrée
• Higgs - dessert
![Page 14: DELPHI Status](https://reader036.vdocument.in/reader036/viewer/2022062723/56813fe9550346895daade76/html5/thumbnails/14.jpg)
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
![Page 15: DELPHI Status](https://reader036.vdocument.in/reader036/viewer/2022062723/56813fe9550346895daade76/html5/thumbnails/15.jpg)
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.
Title:xsec_205_mm.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.
Title:xsec_205_qq.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.
*01
02 Z Model independent limitsModel independent limits
![Page 16: DELPHI Status](https://reader036.vdocument.in/reader036/viewer/2022062723/56813fe9550346895daade76/html5/thumbnails/16.jpg)
20 July 2000 W.Murray 16
Title:
Creator:
Preview: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.
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
![Page 17: DELPHI Status](https://reader036.vdocument.in/reader036/viewer/2022062723/56813fe9550346895daade76/html5/thumbnails/17.jpg)
20 July 2000 W.Murray 17
Search for productionTitle:
Creator:
Preview: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.
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
![Page 18: DELPHI Status](https://reader036.vdocument.in/reader036/viewer/2022062723/56813fe9550346895daade76/html5/thumbnails/18.jpg)
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
Title:mum_207.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.
![Page 19: DELPHI Status](https://reader036.vdocument.in/reader036/viewer/2022062723/56813fe9550346895daade76/html5/thumbnails/19.jpg)
20 July 2000 W.Murray 19
Squark searches
Title:/afs/cern.ch/user/v/verdier/public/limite/Results/2Creator: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.
Title:/afs/cern.ch/user/v/verdier/public/limite/Results/2Creator: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.
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
![Page 20: DELPHI Status](https://reader036.vdocument.in/reader036/viewer/2022062723/56813fe9550346895daade76/html5/thumbnails/20.jpg)
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.
Title:smuon183to205.psg (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.
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
![Page 21: DELPHI Status](https://reader036.vdocument.in/reader036/viewer/2022062723/56813fe9550346895daade76/html5/thumbnails/21.jpg)
20 July 2000 W.Murray 21
Stau status• Stau results at
Moriond interesting
93.7pb-1 @205:
Title:stau189to205.psy (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.
ResultsExp.Obs.
~19.6618
m > 68GeV/c2
See Alberto DeMin’s talk
=-200
tan = 1.5
![Page 22: DELPHI Status](https://reader036.vdocument.in/reader036/viewer/2022062723/56813fe9550346895daade76/html5/thumbnails/22.jpg)
20 July 2000 W.Murray 22
GMSB searches
Limit on GMSB at least SUGRA level
Title:/work/atlas/garcia/excl_stau_r_204.epsCreator: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.
G~~
Expected Observed
KinkSearch
25.018.001.1
1
Large IP 23.014.010.1
1
~
![Page 23: DELPHI Status](https://reader036.vdocument.in/reader036/viewer/2022062723/56813fe9550346895daade76/html5/thumbnails/23.jpg)
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
![Page 24: DELPHI Status](https://reader036.vdocument.in/reader036/viewer/2022062723/56813fe9550346895daade76/html5/thumbnails/24.jpg)
20 July 2000 W.Murray 24
Exotica
Technicolour
Excited leptons
Flavour changing neutral currentsFlavour changing neutral currents
Contact Interactions
![Page 25: DELPHI Status](https://reader036.vdocument.in/reader036/viewer/2022062723/56813fe9550346895daade76/html5/thumbnails/25.jpg)
20 July 2000 W.Murray 25
Title:/delphi4/users/patricia/work00/dsdt.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.
e+e- to
Data corrected to Born level
Limits, combined with other data:
+ >342GeV
- >319GeV
e*>323GeV
for =1
![Page 26: DELPHI Status](https://reader036.vdocument.in/reader036/viewer/2022062723/56813fe9550346895daade76/html5/thumbnails/26.jpg)
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
![Page 27: DELPHI Status](https://reader036.vdocument.in/reader036/viewer/2022062723/56813fe9550346895daade76/html5/thumbnails/27.jpg)
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
Title:/delphi4/users/tome/public/EXCITED/limits/lim00_1_c (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.
![Page 28: DELPHI Status](https://reader036.vdocument.in/reader036/viewer/2022062723/56813fe9550346895daade76/html5/thumbnails/28.jpg)
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
![Page 29: DELPHI Status](https://reader036.vdocument.in/reader036/viewer/2022062723/56813fe9550346895daade76/html5/thumbnails/29.jpg)
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
Title:/afs/cern.ch/delphi/scratch3/b/borisov/tc-lim-jun00Creator: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.
For any ND
))(( bcbcTTT ))(( bclW TT
Combine:
![Page 30: DELPHI Status](https://reader036.vdocument.in/reader036/viewer/2022062723/56813fe9550346895daade76/html5/thumbnails/30.jpg)
20 July 2000 W.Murray 30
FCNC Single top search
• Gives limits on z
Title:paw.metafileCreator: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.
ctzee /
Expected Observed3.3 4
qbqbWt
![Page 31: DELPHI Status](https://reader036.vdocument.in/reader036/viewer/2022062723/56813fe9550346895daade76/html5/thumbnails/31.jpg)
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
![Page 32: DELPHI Status](https://reader036.vdocument.in/reader036/viewer/2022062723/56813fe9550346895daade76/html5/thumbnails/32.jpg)
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.
Title:/afs/cern.ch/user/c/ceballos/public/hz/mass_ee_2000Creator: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.
Title:/afs/cern.ch/user/c/ceballos/public/hz/mass_mm_2000Creator: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.
Title:/afs/cern.ch/user/c/ceballos/public/hz/mass_tt_2000Creator: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.
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
![Page 33: DELPHI Status](https://reader036.vdocument.in/reader036/viewer/2022062723/56813fe9550346895daade76/html5/thumbnails/33.jpg)
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
Title:/afs/cern.ch/user/a/andringa/higgs/lim_hz_00.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.
100%
SM Br
![Page 34: DELPHI Status](https://reader036.vdocument.in/reader036/viewer/2022062723/56813fe9550346895daade76/html5/thumbnails/34.jpg)
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.
Title:/afs/cern.ch/delphi/scratch3/b/borisov/lepc-3.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.
ZZ to llqq
Good description of data
ZZ to bbqq
Small excess of events
![Page 35: DELPHI Status](https://reader036.vdocument.in/reader036/viewer/2022062723/56813fe9550346895daade76/html5/thumbnails/35.jpg)
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
Title:/tmp_mnt/users/delphi/bambade/zzcro2000.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.
![Page 36: DELPHI Status](https://reader036.vdocument.in/reader036/viewer/2022062723/56813fe9550346895daade76/html5/thumbnails/36.jpg)
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
![Page 37: DELPHI Status](https://reader036.vdocument.in/reader036/viewer/2022062723/56813fe9550346895daade76/html5/thumbnails/37.jpg)
20 July 2000 W.Murray 37
Hll search
• 1 candidate in , compatible with ZZ
• no good candidates in ee
HH
![Page 38: DELPHI Status](https://reader036.vdocument.in/reader036/viewer/2022062723/56813fe9550346895daade76/html5/thumbnails/38.jpg)
20 July 2000 W.Murray 38
Searches with ’s
• Consistent with expectations
![Page 39: DELPHI Status](https://reader036.vdocument.in/reader036/viewer/2022062723/56813fe9550346895daade76/html5/thumbnails/39.jpg)
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!
![Page 40: DELPHI Status](https://reader036.vdocument.in/reader036/viewer/2022062723/56813fe9550346895daade76/html5/thumbnails/40.jpg)
20 July 2000 W.Murray 40
Hcandidate
• Mass 111GeV/c2
• B tagged rather strongly
• A reasonable candidate– possibly qq
![Page 41: DELPHI Status](https://reader036.vdocument.in/reader036/viewer/2022062723/56813fe9550346895daade76/html5/thumbnails/41.jpg)
20 July 2000 W.Murray 41
Hqq search• Some excess seen• No Golden
candidate• Several bronze
• Events peak around 107GeV/c2
![Page 42: DELPHI Status](https://reader036.vdocument.in/reader036/viewer/2022062723/56813fe9550346895daade76/html5/thumbnails/42.jpg)
20 July 2000 W.Murray 42
Hqq candidate
•Mass estimate 105.5GeV/c2
•Two b-tagged jets
•A reasonable candidate
![Page 43: DELPHI Status](https://reader036.vdocument.in/reader036/viewer/2022062723/56813fe9550346895daade76/html5/thumbnails/43.jpg)
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
![Page 44: DELPHI Status](https://reader036.vdocument.in/reader036/viewer/2022062723/56813fe9550346895daade76/html5/thumbnails/44.jpg)
20 July 2000 W.Murray 44
hA search• Small excess in bbbb
channel.
• Correlated with ZZ, HZ, Technicolour
• Not very significant
Title:masa_ha4b_sb1.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.
bbbb search
![Page 45: DELPHI Status](https://reader036.vdocument.in/reader036/viewer/2022062723/56813fe9550346895daade76/html5/thumbnails/45.jpg)
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
Title:/tmp_mnt/home/manip/mnt/delphi/mssm/tbeta_mh_max.epCreator: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.
Lim Median ObsMh 87.0 85.1MA 88.5 86.7
![Page 46: DELPHI Status](https://reader036.vdocument.in/reader036/viewer/2022062723/56813fe9550346895daade76/html5/thumbnails/46.jpg)
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
![Page 47: DELPHI Status](https://reader036.vdocument.in/reader036/viewer/2022062723/56813fe9550346895daade76/html5/thumbnails/47.jpg)
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.