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CDF Overview

CDF Overview. Joseph Kroll Penn DOE Review 14 August 2007. TexPoint fonts used in EMF. Read the TexPoint manual before you delete this box.: A A A A A A A. Faculty Joseph Kroll Nigel Lockyer (adjunct, not DOE) Evelyn Thomson Brig Williams Post-docs Anadi Canepa (not DOE)

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CDF Overview

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  1. CDF Overview Joseph Kroll Penn DOE Review 14 August 2007 TexPoint fonts used in EMF. Read the TexPoint manual before you delete this box.: AAAAAAA

  2. Faculty Joseph Kroll Nigel Lockyer (adjunct, not DOE) Evelyn Thomson Brig Williams Post-docs Anadi Canepa (not DOE) Aart Heijboer Chris Neu Graduate Students Justin Keung (20% DOE) Elisabetta Pianori Tatiana Rodriguez Yanjun Tu Instrumentation Group Joel Heinrich Personnel Past Fiscal Year (07-08) • Leadership in past 3 years • Chris Neu – b-tag group convener • Anadi Canepa – L2 calorimeter upgrade • Evelyn Thomson – top group convener • Joseph Kroll – co-lead Bs oscillation discovery

  3. Personnel Next Fiscal Year (08-09) • Faculty • Joseph Kroll • Elliot Lipeles • Nigel Lockyer (adjunct, not DOE) • Evelyn Thomson • Brig Williams • Graduate Students • Justin Keung • Elisabetta Pianori • Tatiana Rodriguez • Yanjun Tu – defends in October 2008 • Instrumentation Group • Joel Heinrich

  4. Careers in Particle Physics after Penn • Aart Heijboer – CERN Fellow (ATLAS) • Anadi Canepa – Research Scientist TRIUMF (ATLAS, CDF) • Aafke Kraan – Marie Curie EU Fellowship (CMS) • Matthew Jones – Asst. Prof. Purdue (CDF, CMS) • Isamu Nakamura – Staff Scientist KEK (Belle) • Chris Neu – Asst. Prof. Univ. of Virginia (CMS, CDF) • Rolf Oldeman – Faculty, Univ. Cagliari, Sardinia (LHCb) • Daniel Whiteson – Asst. Prof. UC Irvine (CDF, ATLAS) • Peter Wittich – Asst. Prof. Cornell Univ. (CDF, CMS) • Chunhui Chen – post-doc Maryland (BaBar) • Kristian Hahn – post-doc MIT (CMS) • Eiko Yu – post-doc FNAL (CDF, CMS)

  5. Contributions to CDF Experiment/Operations • Major contributions of the past*** • COT front end electronics - ASDQ ASIC & daughter board (Lockyer) • TOF signal electronics (Jones, Oldeman, Chen, Usynin, Kroll) • Trigger Level 2 upgrade • Run IIa upgrade (Hahn, Neu, Whiteson, Wittich, Kroll)*** • Run IIb Calorimeter + general expertise (Canepa, Lockyer) • Calibration constants • 1st organized systematic calibration effort (Kraan) • Set up automatic calibration procedure for production (Whiteson) • Silicon tracking detector alignment (Heijboer) ***Critical contributions from Penn Instrumentation Specialists

  6. Physics • B Physics • Primary participants in B0s flavor oscillations • Top Physics (see talk by E. Thomson) • Top cross-section • Top mass • Top decay properties (W helicity measurement) • SUSY (see talk by A. Canepa) • High mass dilepton pairs (e¹, e¿, ¹¿) • Standard Model Higgs (see talks by Thomson, Canepa, Pianori, Keung) • Contributions in several areas – see details later in this presentation

  7. Publications • Authors of 12 publications from CDF Run II in PRL or PRD including • 1st Tevatron Run II PRL (Charm cross-section, C. Chen thesis) • 1st Tevatron Run II High-pT PRL (top dilepton cross-section)

  8. Publications (continued)

  9. Dissertations Y. Tu – expected in October 2008 Plus Keung, Pianori, Rodriguez

  10. Penn played major leadership role Began in Run I Development of flavor tagging B0 oscillation measurements Sin2¯ analysis TOF prototype Run II Highlights Proposed TOF for Kaon ID TOF critical for observation Co-leader of analysis (Kroll) 1st measurement of excess of kaons around B0s (Usynin) Proposed & executed method to determine significance (Heijboer) Critical innovations to sped up likelihood fit (Heijboer) Primary authors of both PRLs Observation of B0s Oscillations

  11. Plans for the Coming Year Both CDF & Tevatron are running extremely well The most exciting results still to come from these data

  12. Largest production cross-section Instead search for But QCD background overwhelms at low mass For low mass Higgs Use associated production Leptonic W & Z easily identified Search for SM Higgs at Tevatron

  13. Penn Contributions to Higgs Search Reminder: Penn co-lead (Kroll) Higgs Sensitivity Study in 2003 • New trigger capabilities • L2 upgrade • Studies of trigger algorithms (Higgs trigger task force, ¿ triggers) • Increase trigger efficiency – especially as inst. L increases • Understand backgrounds • Measure Wbb cross-section • Measure WZ, ZZ production • Increase signal sensitivity • Z! bb for b-jet energy calibration • b tagging studies • Add new signal paths • Build on ¿ id developed for dilepton SUSY search • Add W!¿º¿ to WH channel • Use W!¿º in H! WW • Use W,Z! qq0 in WH, ZH • Exploit experience with Matrix Element tech. used in top mass meas. • Investigate VBF (undergrad involvement: Lauren Wozniak, Ian MacNeill) Described in talks that follow

  14. q q Motivation for All-hadronic SM Higgs Search W decay modes Z decay modes ene nn mnm ee mm tt tnt _ _ qq=70% qq=68% CDF Run IPRL 95, 051801(2005)‏ • All-hadronic channel has largest signalyield of all channels (Br W/Z ! qq ≈ 68%) • Challenge: Large QCD bbqq background • Run I result was comparable with leptonicchannels: as good as Wln and Zl+l- • Not yet investigated in Tevatron Run II.Will add new events to ongoing searches. • Data collected with multi-jet trigger originallyintended for all-hadronic ttbar. _ _ _ Initiated by A. Heijboer + D. Whiteson. Joined up with parallel initiative by group from Academia Sinica (Taiwan).

  15. Modeling the QCD background • idea: look in background-enriched 1-b tagsample to estimate the number of 2-b tag signal events. • Determine the Tag Rate Fraction (TRF) in a region without VH signal. • Backgrounds with real Z/W (e.g. ttbar) will be modeled by MC TRF prediction data _ qq sideband: use to measure TRF Tag rate function predicts #events in signal region. Mqq 'signal' region VH signal _ qq sideband: use to measure TRF Mbb (GeV)‏ Mbb

  16. data (QCD)‏ Higgs signal MC ( P(x|WH) + P(x|ZH) P(x|WH) + P(x|ZH) + P(x|QCD) ) log Separating signal and background Discriminate between data and background using Likelihood computedusing Matrix Elements. The probability of seeing event x is: integrate over unknown parton momenta matrix element describes parton level physics jet transfer functions describes the detector response to partons Likelihood ratio to discriminate signal and bg. QCD normalized to signal MC • particular for this analysis: O(100k) events to analyze. Execution speed had to be drastically improved (from 15 min ! 10 sec). • S/B separation compares favorably to alternatives (NN, BDT)

  17. ( P(x|WH) + P(x|ZH) P(x|WH) + P(x|ZH) + P(x|QCD) ) log Separating signal and background Discriminate between data and background using Likelihood computedusing Matrix Elements. The probability of seeing event x is: integrate over unknown parton momenta matrix element describes parton level physics jet transfer functions describes the detector response to partons Likelihood ratio to discriminate signal and bg. • particular for this analysis: O(100k) events to analyze. Execution speed had to be drastically improved (from 15 min ! 10 sec). • S/B separation compares favorably to alternatives (NN, DBT)

  18. Results (1)

  19. Results (2)

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