delphi status

20 July 2000 W.Murray 1

DELPHI Status

Or...

Should we extend the run?

LEPC July LEPC July 20002000


Talk Overview

• Data taking efficiency and Detector performance

• Standard model results

• Searches– Supersymmetry

– Exotica

– Higgs (& ZZ production!)

• Conclusions


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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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


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


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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S/

distribution

L=87.75pb-1

• qq centre of mass energy/ECM, estimated from jet angles

• Agreement with PYTHIA 6125

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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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B tagging cross-check

• Z resonance data well described

• Semileptonic WW sample also OK

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Light quarks

b quarks

Non-WW


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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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

qq

qqe

qq

ExcExcelleellentnt


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:


Searches

• SUSY- aperitif

• Exotica - entrée

• Higgs - dessert


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


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


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


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


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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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


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


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


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

~


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


Exotica

Technicolour

Excited leptons

Flavour changing neutral currentsFlavour changing neutral currents

Contact Interactions


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e+e- to

Data corrected to Born level

Limits, combined with other data:

+ >342GeV

- >319GeV

e*>323GeV

for =1


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


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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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


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:


FCNC Single top search

• Gives limits on z

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ctzee /

Expected Observed3.3 4

qbqbWt


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


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


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


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.


ZZ to llqq

Good description of data

ZZ to bbqq

Small excess of events


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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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


Hll search

• 1 candidate in , compatible with ZZ

• no good candidates in ee

HH


Searches with ’s

• Consistent with expectations


Hchannel• Sensitive to

high-mass due to WW fusion

• Slight deficit of candidates– Consistent with

background

• Final event has high mass!


Hcandidate

• Mass 111GeV/c2

• B tagged rather strongly

• A reasonable candidate– possibly qq


Hqq search• Some excess seen• No Golden

candidate• Several bronze

• Events peak around 107GeV/c2


Hqq candidate

•Mass estimate 105.5GeV/c2

•Two b-tagged jets

•A reasonable candidate


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


hA search• Small excess in bbbb

channel.

• Correlated with ZZ, HZ, Technicolour

• Not very significant

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bbbb search


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


Summary

• DELPHI performance is good and well understood• Standard model physics processes normal

• No significant signals observed

Our thanks to all the LEP team


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.

delphi status

Documents

042gevc2 tan b

49gevc2 tan b

tan b exclusion

qqqq radiativetan b

c productiontopolgies

c productionnot

reduced voltage

qq centre of mass energyecm