DOE, July 23, 2003, R. Demina1 DØ and CMS physics program Regina Demina July 23, 2003

DOE, July 23, 2003, R. Demina2 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

DOE, July 23, 2003, R. Demina3 Outline DØ physics program Tevatron  LHC transition CMS silicon tracker construction Work on silicon detectors at UR

DOE, July 23, 2003, R. Demina4 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

DOE, July 23, 2003, R. Demina5 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

DOE, July 23, 2003, R. Demina6 UR for Top cross section Lepton = EM(MU) +track Jets+Met B-tagging Luminosity Analysis EM showers: Cho CFT: Ginther, Davis Tracking algorithm: Khanov Jet reco: Davis Calorimeter task force: Chan, Zielinski EXAMINE: Canelli Silicon clusters: CSIP: Demina, Khanov Lum_ID:Begel, Slattery e+j : Cho l+b-tag: Demina, Khanov Simulation: Zielinski Matrix element approach (to be applied): Ferbel, Canelli, Estrada Color key: PI, Senior RA, Postdocs, Grad. Students

DOE, July 23, 2003, R. Demina7 Ttbar production cross section Use NN to improve discrimination between ttbar from W+jets in e+>=4 jets channel. Inputs: aplanarity(A), scalar E T (H T ) D. Cho

DOE, July 23, 2003, R. Demina8 Ttbar production cross section  = (stat) (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

DOE, July 23, 2003, R. Demina9 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 data Ferbel, 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

DOE, July 23, 2003, R. Demina10 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 H  bb, Z  bb 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

DOE, July 23, 2003, R. Demina11 Tevatron  LHC 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

DOE, July 23, 2003, R. Demina12 Tevatron  LHC 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 gg  H   ) –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

DOE, July 23, 2003, R. Demina13 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

DOE, July 23, 2003, R. Demina14 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

DOE, July 23, 2003, R. Demina15 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 place Probstation is scheduled to be shipped on 7/24 K-State UR

DOE, July 23, 2003, R. Demina16 Development of radiation hard Si Demina, Korjenevski, Ginther Run 2b rad hard Si development success ELMA HPK Irradiation dose after 20fb -1 at r=1.8cm Vdepl <<700V (breakdown)

DOE, July 23, 2003, R. Demina17 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

DOE, July 23, 2003, R. Demina18 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