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DØ and CMS physics program Regina DeminaJuly 23, 2003

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Hadron collider program at UR

• Rochester is essential institution in DØ– Great number of key DØ players are or were affiliated with UR

at some point in their career

• It is important to maintain Tevatron program =CDF+DØ– Important measurements to come:

• Top! – we just opened the door to top physics in Run 1. Run 2 is the time to walk in. Potential role of top quark in EWSB.

• Jet (especially heavy flavor) production, W,Z production …– Tevatron program is essential to expedite the way to physics

in LHC

• UR is making crucial contribution to CMS• UR – bridge from Tevatron to LHC program

– Preparation and experience in hadron physics are essential for the fastest way to physics

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Outline

• DØ physics program • Tevatron LHC transition• CMS silicon tracker construction• Work on silicon detectors at UR

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Focus of DØ physics program

• Top quark physics = Hope for surprises • Why is it so heavy?• Why its mass is on the EW scale?• Potential role in EWSB: coupling to gauge bosons

– W helicity, – ttj, tt production

• Is it top? – study basic properties, e.g. charge, spin• It is only top? – study kinematics, ttbar invariant mass• Understanding of jets production, heavy flavor

– QCD test, background normalization, probe of new physics– “engineering” measurements for LHC

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Jet production cross section

• One of the first run 2 physics results• Dijet mass – new physics probe• Zielinski (QCD convener for 2 years of Run II), Begel, Davis

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UR for Top cross section

Lepton = EM(MU)+track

Jets+Met

B-tagging

Luminosity

Analysis

EM showers: Cho CFT: Ginther, DavisTracking algorithm: Khanov

Jet reco: DavisCalorimeter task force: Chan, ZielinskiEXAMINE: Canelli

Silicon clusters:CSIP: Demina, Khanov

Lum_ID:Begel, Slattery

e+j : Chol+b-tag: Demina, Khanov

Simulation: Zielinski

Matrix element approach(to be applied):

Ferbel, Canelli, Estrada

Color key:PI, Senior RA, Postdocs, Grad. Students

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Ttbar production cross section

• Use NN to improve discrimination between ttbar from W+jets in e+>=4 jets channel.

• Inputs: aplanarity(A), scalar ET (HT) D. Cho

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Ttbar production cross section

=7.4+4.4-3.6(stat)+2.1

-1.8(sys)±0.7(lum) pb•Allow 3 or more jets in lepton+jets channel, but apply b-tagging •First time in DØ use lifetime based b-tagging!

btag

Demina, Khanov

L=45pb-1

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W-helicity in top decay

• Important measurement that probes top coupling to gauge bosons

• Hypothetical top role in EWSB may manifest itself in deviation from Standard Model

SM

Run 1 dataFerbel,Canelli (to graduate this summer)Estrada(graduated)

Great improvements in Run 2:•With 2fb-1 x20 in stat•B-tagging – drastically improve S/N •B-charge tagging – reduce combinatorics in jet assignment

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• Task B• Zielinski, Begel, Davis: Jet production studies• Cho: top cross section in e+jets• Chan: non-standard coupling to tt prod• C. Garcia: mass resolution in Hbb, Zbb• Pleier: W-helicity, backgrounds to top, heavy flavor production• Task C• Khanov: top x-section with b-tagging• Schwaab: b-charge tagging, W-helicity• E. Grove: b/c separation, b/c production• ttg, tt production (need more people)

Ongoing and future analyses

Color key:PI, Senior RA, Postdocs, Grad. Students

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TevatronLHC transition• Commissioning

– Could be lengthy and painful– Experience and preparation is the key:

• Ginther (CFT), Demina (SMT), Tipton(SVXII)• Pleier (CMS DAQ, test beam data)

• Calibration of detector systems and physics objects on collider data- use methods developed at Tevatron

• Physics of hadron environment:– Use of Tevatron data for “engineering” measurements

• Zielinski –experience with Tevatron, connection to theory, MC tools• Pleier – heavy flavor production• tt+jets production• L. Orr – theoretical guidance

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TevatronLHC transition,case study: ttH

• Associated ttbar and Higgs(bb) production – One of the discovery channels for low mass Higgs– Tree level at production and decay (unlike ggH)– Proof that it is indeed Higgs – probe coupling to two fermions – t

and b

• To establish the signal in CMS we need– Lepton, jets and missing energy ID and calibration of objects

(Zielinski – techniques developed at Tevatron)– 4 b-jets!: B-tagging development and calibration (Demina, Tipton)– Reduce combinatorics in jet assignment – b-charge tagging

(Demina, Schwaab)– Understanding production rate (Orr – NLO calculation, Zielinski –

MC)– Backgrounds – can be measured at Tevatron(!):

• W+bb+jets (Pleier)• tt+jets• Improved mass resolution (C. Garcia’s study)

Studies at Tevatron pave the road to discovery at LHC

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Silicon for CMS

• CMS Tracker Outer Barrel (1/3 of the tracker) – US project: Tipton, Demina

• 2 production sites:FNAL, UCSB• UR – key institution for FNAL

production line.

UR

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UR People on CMS-TOB

• Demina: co-leader, liaison with EU, parts delivery• Demina, Ferbel, Korjenevski(50%), undergrads:

sensor probing• Tipton: transportation• Pleier(30%), Hocker(10%), Eusebi(30%), Tipton:

rod burn-in testing: DAQ, cooling, interlocks• Ginther, Halkiadakis, J. Gielata, A. Sanocka –

module/rods construction and mech inspection at FNAL

Color key:PI, Senior RA, Postdocs, Grad. Students, Project funds

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Silicon technology• Continue successful approach developed at Kansas

State University (R. Demina)• Si – the fastest growing technology in HEP• Research done using onsite facilities

– Involve early grad and undergrad students– Good training for HEP, solid state, semiconductor industry– Work done for two projects (CMS, DØ 2b) with positive

interference

• Success in 2b sensor development• Silicon facility setup at UR supported by

– UR, dean’s funds– CMS MOU funds– DØ MOU funds

• Multipurpose– CMS sensor probing– DØ sensor QA– Further development of rad hard technology for super LHC

Most equipment is in placeProbstation is scheduled to be shipped on 7/24

K-State

UR

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Development of radiation hard Si

• Demina, Korjenevski, Ginther• Run 2b rad hard Si development success

ELMA

HPK

ELMA L1 sensors

0

50

100

150

200

250

300

350

400

450

0.1 1 10 100 1000

flux, E12 n/cm2

ELMA 7

ELMA 12

hamburg model

HPK L1 sensors for Run 2b

0

50

100

150

200

250

300

0.1 1 10 100 1000

flux, E12 n/cm2

Depletion voltage, V

HKP 20

HPK 11

HPK 12

hamburg model

Irradiation dose after 20fb-1

at r=1.8cm (L0 @D0)Vdepl <<700V (breakdown)

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Si R&D for super LHC• R&D for the LHC detectors started in early 90’s• US CMS is planning for super LHC upgrades• Tracker is the first priority, new technology must be developed• Focus on

– Rad hardness– Improved resolution– Reduced cost

• We have done silicon development for one project (DØ 2b)• We have made significant contribution to the construction of

three silicon detectors (CDF SVXII, DØ SMT2b, CMS TOB)• Have expertise, facility, contacts, interested collaborators at

UCSB, FNAL• Possible route – join RD50, take advantage of the new

approaches under development – Started initial discussions with RD50 leadership and groups

• Testing new ideas (e.g. 3D column Si) with CMS electronics

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Conclusions

• UR delivers highest quality– Technology, detectors, algorithms, physics, people

• We have a well thought out plan for– DØ algorithms development and physics analysis– DØ and CMS detector construction– Transition from Tevatron to LHC physics– Technology development for future experiments

• It’s a lean mean physics machine on its way to discovery– Keep it running