1 / 33

Mark Oreglia Activities in the EFI HEP Group

Mark Oreglia Activities in the EFI HEP Group. OPAL ATLAS (Muon Collider/Beamline Instrumentation)* International Linear Collider * ICAR project. OPAL: 1985-2005. There was much more hair around here in 1987 … when we built OPAL’s Presampler Barrel

elana
Download Presentation

Mark Oreglia Activities in the EFI HEP Group

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Mark Oreglia Activities in the EFI HEP Group OPAL ATLAS (Muon Collider/Beamline Instrumentation)* International Linear Collider * ICAR project M. Oreglia/NSF Site Visit

  2. OPAL: 1985-2005 • There was much more hair around here in 1987 … when we built OPAL’s Presampler Barrel • Shows the stress of reductions in NSF funding • What Pilcher did not cover: • Chicago searches • b ID and B physics • Tau physics • Exotic Higgs bosons • LEP-wide Higgs combo M. Oreglia/NSF Site Visit

  3. Searches for Higgs Bosons • Chicago has been involved in the OPAL Higgs searches since day-1: • Oreglia authored first OPAL Higgs search paper (1990) • Presented first LEP search summary at Neutrino ‘90 • Oreglia, Strom, Roney: dilepton channel • Hocker, Oreglia: tau channel and MSSM strategy • Tau channel sensitive to new physics • Contributed to flavor-independent Higgs limit • Nguyen, Merritt: first decay-mode independent LEP search (1991) • Coverage of low mass region filled a gap and is still the best limit M. Oreglia/NSF Site Visit

  4. From Hogan’s Flavor-Independent Paper • LEP-1 analysis from 1991 • set limits to mH=0 • tagged recoil against: • Z → ee, mm • Z → nn • still best low-mass limits M. Oreglia/NSF Site Visit

  5. Nonstandard Higgs Bosons • Exploration of more general 2HDM led to “photonic Higgs” LEP industry (Oreglia, Turcot) • First paper in 1993; followed by other 3 LEP collabs • Led to development of better photon ID tools • Promoted better investigation of theory space • Expanded fermiophobic 2HDM • Higgs triplet models • Final analysis of all LEP data: • OPAL limit is still the best, so there! • Oreglia has combined the LEP results … limit to 109 GeV • Inclusion of WW, ZZ channels in process (publication in 2005) • Participation in MSSM analysis → CP-violating model • Only OPAL has limits on this now-popular model M. Oreglia/NSF Site Visit

  6. Results from OPAL Photonic Higgs Search M. Oreglia/NSF Site Visit

  7. b ID and B physics • Kroll: chaired lepton ID working group; improved b ID for first Rb analyses • Glenzinski, Hocker: applied first likelihood + ANN techniques to b ID … platform for W mass • Bellrive extended this to charm and got improved Vcs and RWc • Also resulted in single-top production search and limits on FCNC • Amaral, Oreglia revisited measurement of the semileptonic decays of the b quark into P-wave charmed meson D** states M. Oreglia/NSF Site Visit

  8. BR(BD**ℓ ) • disagreement among experiments on branching ratios into the two narrow states (D1 and D2*) and whether two predicted broad states exist • difficult because the D** decay products must be identified in the core of a jet. • Advances in data analysis techniques (especially b-tagging and particle ID) warranted a repeat measurement, and the new analysis has obtained much better results compared to the previous OPAL publication. • It was nice to measure something that exists  M. Oreglia/NSF Site Visit

  9. Other Chicago Contributions • Heavy leptons: Merritt, Anderson, Redmond, Schappert • Excited leptons: Teuscher, Oreglia, Zhao • Tau Physics: Evans, Pilcher,Tecchio • Instrumentation: • Eric Torrence (with Mike Hildreth) came up with the idea of designing a beamline spectrometer to check the LEP energy calibration … 10 MeV precision • Luminometer: • DAQ electronics designed/built at EFI (Anderson, Pilcher) • Si prototyping and construction: Tecchio developed 5 mm metrology • lumi testbeam organized by Chicago: Oreglia, Evans, Wagner, Hart, Strom • Tools: • Bellerive, Kroll, Glenzinski, Hocker: vastly improved lepton, b- and tau tagging using likelihood techniques incorporating neural network elements • Evans, Tecchio, Pilcher: Kaon ID in multihadron modes • Oreglia, Turcot: improved conversion ID … package used in all post-1995 photon analyses • Amaral, Oreglia: improved b-ID in multi-jet environment • Merrett, Anderson: major fix in heavy lepton MC • Strom, Wagner; Hart, Pilcher; Oreglia: luminosity analysis M. Oreglia/NSF Site Visit

  10. Exotics – Phase II • LEP exotic Higgs activities have been reborn in Geneva: the CP-violating and non-standard Higgs WG • Application to TeVatron, b-factories, LHC and LC • Making sure we cover all the bases • Just like the yellowbook era of 1990 … new stuff M. Oreglia/NSF Site Visit

  11. NSH: ATLAS Coverage • It is becoming increasingly apparent that there are non-minimal models which have theoretical advantages over MSSM: • Strong EWSB • MSSM+extra singlets = Minimal Nonminimal SSM… MNSSM • Higgs not of this earth: Extra Dimension models • Higgs as a pseudo-Goldstone boson: Little Higgs • 2HDM and triplets: fermiophobic Higgs • … and the list is growing • Problem: adequately covering the phase-space • Are there topological solutions? • What signatures yield fastest unraveling • K-factors still not under control M. Oreglia/NSF Site Visit

  12. ATLAS Activities • Rapidly growing Chicago analysis activity • Gupta and Merritt paved the way • Farbin and Hurwitz advancing SUSY analyses • Martina moving to CERN; devoting to SUSY Emiss analysis • Now primary activity for Oreglia • With Matt Wood: explored calorimeter cell-weighting within Athena • New optimizing event definition for specific processes • Since 2000: working with Elizabeth Richter-Was on covering exotic SSB searches • But aversion to using inadequate older simulations • Going state-of-art has long learning curve these days • Co-coordinator now in CPNSH M. Oreglia/NSF Site Visit

  13. More prosaic: Early studies of calorimeter cell weighting schemes • Work done 2002-3 with student Matthew Wood • Study of jet energy resolution as function of calorimeter cluster weights • The problem: calorimeter calibrated to EM energy scale, and hadron calorimeter is not compensating • We sought to minimize resolution with weights defined for h zones … used full ATHENA framework (ouch!) M. Oreglia/NSF Site Visit

  14. Chicago SUSY Emiss Activity • Gupta, Farbin, Hurwitz very active in crafting second-generation SUSY Emiss analysis • Using the real tools … not old noiseless fortran • Well matched to our work on jet definition and calibration • Farbin has been successful in getting our own GRID production underway • Looking at Meff = ETmiss + ETjets • Have generated good statistics samples now • Seeing big differences from DC1 • Starting to explore: • Resolution … testbeam analysis • Looking for better variables/objects M. Oreglia/NSF Site Visit

  15. My own “pet” project of the moment: Hard, but Interesting physics … Higgs or Strong EWSB or ??? • Challenging process for detector • 2 high-pT forward jets + WW or ZZ in central region • problem background from gg→ttg • Recent progress … discovery of discriminating variables (Dytag, etc) • Can optimizing particle flow help out here? • Can PF lead to better discriminating variables or likelihood? • Can jj mass resolution be optimized by PF to differentiate W or Z? • And this study good for LC too  • Therefore, just beginning to study calorimeter clustering and PF matching to tracker with 2 undergrads (Jim McNeur and Tien-tien Yu) M. Oreglia/NSF Site Visit

  16. Muon Collider Interlude • During 2001-2004 I spent a fraction of my time studying Muon Collider physics and beamline instrumentation • Work conducted with Kwang-Je Kim and postdoc Kara Hoffman using funding from State of Illinois • The problem: instrumentation that can survive the extreme environment in a muon ionization channel M. Oreglia/NSF Site Visit

  17. Beam Profile Monitor Ideas • 1st round: concentrated on bolometric concept – attached to liquid-H absorber vessel • Developed graphite, nickel, etc, devices • Refurbished vacuum deposition system; built prototypes • Harold Sanders & Mircea Bogdan developed electronics • Set up pulsed Xe and Ar-laser beam simulators; later beam tests • Trained 5 undergrads (and Kara ) • But: evident now that MuColl technology far in future, and Kara had the idea to try dirty CVD diamond • Hypothesis: near-heatsink grade CVDD might perform adequately in intense beams and survive • Result: it worked; prototypes built and tested • FNAL beams division is producing some now M. Oreglia/NSF Site Visit

  18. Linear Collider Activities • When it became clear that MuColl not feasible, LC activity was ramping up … Snowmass 2001; HEPAP • Chicago hosted ALCPG January 2002 Workshop • Jim Brau and myself suceeded Baltay/Grannis as ALCPG co-chairs • Blucher, Kim on Exec Ctte • Kim on US SG • LC Steering cttes formed • MJO edited US “scope” paper • MJO co-wrote the ILC scope paper • MJO+Dawson: ARNPS 2004 review on LC • Jim & I focusing on getting detectors better defined and important R&D to a higher level • DISCLAIMER: LHC activity has higher priority right now; for moment asking just for LC travel M. Oreglia/NSF Site Visit

  19. Remainder of My Talk:Why LC Detector $ Now; MJO Projects • ILC/FALC schedule call for physics starting 2015 !!! • Not credible, but they have reasons for staying with this for now • Strong reasons to urge startup while LHC still online (2020?) • With that timeline in mind, many feel it is premature to spend R&D money on detectors now • I don’t, so let me explain why • LC detectors have very clear physics missions • They require state-of-the-art  2-10 • Repeat: not LHC technology; not LEP technology The following are adapted from a recent talk at MDI/SLAC M. Oreglia/NSF Site Visit

  20. 3 Archetype Physics Topics • Light Higgs -- tracker • Best recoil mass resolution in Z-> dileptons • Strong EWSB -- calorimeter • Important to look at WW scattering • W/Z jet separation crucial • Some SUSY scenarios -- hermeticity • Cosmology “benchmarks” summarized: • “bulk” -> cc annihilation -> smuon/selectron • “coannihilation” -> c-stau annihil. -> staus • Low angle backgrounds M. Oreglia/NSF Site Visit

  21. Momentum Resolution • e+e-gZHgllX • Golden physics channel! • Zgmm BR = 3.4% • d(1/p) = 7 x 10-5/GeV • 1/10 LEP !!! • goal: dMmm <0.1x GZ • dMHdominated by beamstrahlung M. Oreglia/NSF Site Visit

  22. Impact Parameter • dd= 5 mm Å 10/p(GeV) mm • 1/3 SLD !!! • excellent flavor tagging capabilities for charm and bottom quarks • Need exceptional tagging for reducing combinatorial background in multi-jets ... • Charge assignment • Asymmetry measurements • (measurement of Higgs BRs not so sensitive!) • The big question: inner VTX radius • No simple answer – physics reach gains with lever arm and background suppresion, esp low momentum particles • … thus, low MS, small radius is essential • Needs more validation, but we are talking 1.5 cm radius! • Instrument lifetime issue M. Oreglia/NSF Site Visit

  23. (Jet) Energy Resolution • dE/E = 0.3/ÖE(GeV) • <1/2 LEP !!! • DMDijet ~ GZ/W • separation between e+e-gnnWWgnnqqqq and e+e-gnnZZgnnqqqq M. Oreglia/NSF Site Visit

  24. Particle Flow • reconstruction of multijet final states • e+e- H+H-  tbtb  bqqb bqqb • Emphasis on combined systems now • System compataibility means fine granularity in calorimeters (1 cm2 !!!) • Digital mode possible, if backgrounds controllable M. Oreglia/NSF Site Visit

  25. Hermeticity • hermetic down to q = 5 mrad • Important physics with missing energy topologies (SUSY , extra-dim, Higgs, ...) • Background issues • Ability to veto low-pT particles • Crossing angle optimization • Excellent physics motivation: SUSY-stau M. Oreglia/NSF Site Visit

  26. IR-Related Issues • Good measurements in the low-angle region • Need to make pT cuts for physics analyses • Need to mask and reduce occupancies in low angle region • Need convincing? See Bambade’s summary of X-angle mtg • Beam-beam interaction • broadening of energy distribution (beamstrahlung) • ~5% of power at 500 GeV • backgrounds • e+e- pairs • radiative Bhabhas • low energy tail of disrupted beam • neutron “back-shine” from dump • hadrons from gamma-gamma M. Oreglia/NSF Site Visit

  27. IR Issues pairs Hits/bunch train/mm2 in VXD, and photons/train in TPC M. Oreglia/NSF Site Visit

  28. Beam Energy • need to know <E>lumi-weighted • Some analyses require better than 0.1% • techniques for determining the lumi-weighted <ECM>: • energy spectrometers • Bhabha acolinearity • Other possibilities : • gZ, ZZ and WW events; use existing Z and W mass • utilize Bhabha energies in addition to Bhabha acol • m-pair events; use measured muon momentum • 200 ppm feasible; 50 ppm a difficult challenge Top-mass: need knowledge of E-spread FWHM to level of ~0.1% M. Oreglia/NSF Site Visit

  29. Crossing Angle M. Oreglia/NSF Site Visit

  30. There are currently 3 Detector Concepts • The WorldWide Study is working on a plan: • organization of effort • benchmarking performance • cdr/tdr’s • selection • 3 concepts are materializing: • The TESLA concept: TPC-tracker • Silicon tracker + calorimetry (SiD) • new large magnetic volume concept (Global Large Detector, GLD) • Rethinking as new information available M. Oreglia/NSF Site Visit

  31. Comparison of 3 Concepts(thanks to Y. Sugimoto) • Very large R • Jet chamber or TPC • Scintilator/W-Pb-Fe • Si tracking and ECAL • Small R • Smallest granularity • Moderate R • TPC tracker • SiW ECAL M. Oreglia/NSF Site Visit

  32. Snowmass 2005 • The ALCPG and, separately, ILC will meet at Snowmass this summer • Crucial steps towards detector definitions and CDRs • Real chance to optimize integrated detector design for PF • Essential studies of Machine-detector interface • 700 participants expected, with about 50% non-US M. Oreglia/NSF Site Visit

  33. Summary of MJO LC Future • 1st priority: getting global detector R&D on track • 2005: concentrate on administrative role (travel money) • Detector R&D activity: detector optimization for PF • Working with undergrad to do this for SiD concept • Linking this to what we learn from PF studies for ATLAS • Since ATLAS takes priority now, I see this as the responsible way to contribute to LC (unless a postdoc can eventually be taken on for LC activity) • I have also worked with Jose Repond (ANL) on RPC hadcal • Undergrads Abby Kaboth and Steve Olmschenk built/tested prototypes and CR telescope/tracker • Abby identified several problems with the design: • I’d like to continue participating on CALICE prototype and beamtest … perhaps subcontract to build FE electronics in our e-shop M. Oreglia/NSF Site Visit

More Related