1 / 32

University of Rochester Participation in CDF

University of Rochester Participation in CDF. Outline. Introduction/Group Members Our Operational Responsibilities Physics Pursuits Top Physics Non-Standard Top Coupling, Dilepton signature, New physics search in Dileptons, Top to taus Electroweak Physics,

timberly
Download Presentation

University of Rochester Participation in CDF

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. University of RochesterParticipation inCDF DOE, July 23, 2003, P.Tipton

  2. Outline • Introduction/Group Members • Our Operational Responsibilities • Physics Pursuits • Top Physics • Non-Standard Top Coupling, Dilepton signature, New physics search in Dileptons, Top to taus • Electroweak Physics, • W,Z production rates and asymmetries, extracting PDFs • Search for heavy bosons DOE, July 23, 2003, P.Tipton

  3. Current CDF Group Members Three sub-groups function as one on many projects, but primary hardware/physics interests align us as follows: Arie Bodek (50%): -Howard Budd (50%) -Pawel DeBarbaro (10%) -Willis Sakumoto -Yeon Sei Chung (95%) -Phil Yoon (4th year) (acc. Phys., FNAL Support) -J.-Y. Han (entering w/ MS) -G.-B. Yu (entering w/ MS) • Kevin McFarland (75%): • -Anthony Vaiciulis • Gilles deLentdecker • J. Chvojka (entering) • S. Demers (4th year) • B. Y. Han (1st year) • B. Kilminster(graduating) • Jedong Lee (3rd year) • Chris Clark (REU) • Paul Tipton (75%): • Eva Halkiadakis(90%) • Andy Hocker (90%) • M. Coca (5th year) • R. Eusebi (70%, 3rd year) • Andrew Ivanov (5th year) • Sarah Lockwitz (REU) Color KEY: PI’s Senior Res. Assoc. Postdoc. Fellows Grad Students Undergrads DOE, July 23, 2003, P.Tipton

  4. The Rochester CDF Group • CDF effort led by Bodek, Tipton, McFarland • We are focused on: • Tests of the SM in and around the top candidate sample • Production and decay parameters of the Top Quark • Electroweak physics with W and Z Bosons • Search for new W and Z Bosons • Higgs Search • Much experience from Run I (top discovery, heavy Z searches, etc) DOE, July 23, 2003, P.Tipton

  5. Rochester’s Three Areas of Focus and Operational Responsibility • Run 2 forward calorimeter --‘endplug’ (Bodek) • Hadronic section a Rochester-led effort • Constructed at FNAL with Rochester physicists and technicians doing fabrication, QA. • Rochester in charge of test beam calibration, calibration at B0, installation, commissioning and operations. • Fermilab responsibility -phototubes and bases Note: A lot of Physics (e.g. W Asymmetry, W Mass, PDFs) needs the plug. DOE, July 23, 2003, P.Tipton

  6. CDF Plug Operations Run 2Problem: Degradation of both EM and Hadron Plug calorimeter response at forward plug  (eta) Investigated ->by our group using the laser monitoring system. Problem narrowed down to degradation of phototubes due to high current associated with beam. Solution->(a) Lower the voltage to fix the problem. (b)Correct older data using the laser information Central-Plug Z mass constant after the application of Laser gain corrections DOE, July 23, 2003, P.Tipton

  7. Rochester Silicon Operations Second area of Focus: Silicon Tracking • Run 2 SVXII (Tipton) • Rochester group contributed to SVXII Ladder and Barrel fabrication • Silicon Cooling and Interlocks • Radiation Monitoring and Tevatron abort • Cabling and Power Supply Specifications DOE, July 23, 2003, P.Tipton

  8. Rochester Silicon Operations, Cont. • Cooling and Interlock Operations/On-Call (All) • UR Person on call 24-7 for Cooling and Interlocks • Tevatron Abort and Radiation Monitoring/Radiation Safety Officers (E. Halkiadakis, A.Hocker, R. Eusebi) • Silicon Power Supply Working Group (A.Hocker, A.Ivanov) • Silicon Leakage-current monitoring (Hocker, Eusebi) • Silicon Online Monitoring (Halkiadakis, Coca) • Typically take 95% of data with about 85% of silicon useful June 2002 May 2003 Improved silicon coverage DOE, July 23, 2003, P.Tipton

  9. 3rd Area of Focus:Level-3 / Data Hub(McFarland) • Software trigger based on offline reconstruction • Current→ Upgraded Bandwidth • Input rate: 80→150 MB/sec • Output: 20→60 MB/sec • Level-3 selections determine offline datasets after processing • Seeds both offline production and user analysis • “Data Hub” takes accepted Level-3 events, logs them and distributes to online monitoring system DOE, July 23, 2003, P.Tipton

  10. Level-3 / Data Hub Operations • Both Level-3 and the Data Hub are critical online systems • require extensive pager coverage, hardware and software maintenance • Level-3 Operations (deLentdecker, Demers, B-Y Han, KSM) • Rochester personnel create all Level-3 triggers in trigger DB • Responsible for testing new filter code • Maintain software I/O infrastructure (interface between filtering software and online system) • Data Hub Operations (Vaiciulis, Kilminster, Lee) • Vaiciulis serves as Data Hub sub-project leader • Rochester group carries most of pager load • Hardware maintenance (RAID arrays), software upgrades • Data Hub is key DAQ monitoring point; frequent requests for minor updates DOE, July 23, 2003, P.Tipton

  11. Current Level-3 / Data Hub Development • Level-3 Output reduction (deLentdecker, Demers, McFarland) • Level3Summary replaces and summarizes Level-3 reconstruction results • reduces event size ~25%. Adds permanent record of Level-3 results • Data Hub Operations(Vaiciulis, Kilminster, Lee, Clark) • to improve yield for B physics (hadronic Bs final states), CDF has recently proposed doubling the data rate out of Level-3 • requires a major increase in data hub bandwidth • recent internal review has advised developing a system with triple the bandwidth within one year • Vaiciulis, Clark (NSF REU) doing preliminary tests with IDE-RAID based networkp-attached fileservers • portion of McFarland CAREER award not for outreach purchased test hardware for data hub upgrade 3ware IDE RAID controller for low-cost NAS-based Data Hub DOE, July 23, 2003, P.Tipton

  12. 290 pb-1 delivered ~220 pb-1 recorded Run 1 luminosity CDF Data-Taking In first 6 months of 2003, UR Scientists provided 150 8-hour data-taking shifts A. Hocker is current CDF Operations Manager ~195 of 225 pb-1 goal delivered y.t.d. Typically run with 85-90% efficiency Ultimately collect 4-8 fb-1 Between ~67 and 125 pb-1 used in analyses presented here DOE, July 23, 2003, P.Tipton

  13. Great Progress in One Year 1 year ago (2002) Now (2003) • L1/L2/L3 rates: 18k/250/75 Hz 6k/240/30Hz ~45e30 ~15e30 • Biggest run: 1553 nb-1 (run 163064)447 nb-1 (run 145005) taken May 17-18th 17h w. Si. taken May 17, 11h w Si. • Highest Init. Lum. 47.5e30 (May 17th)20.6e30 (May 19th) • Best store CDF int. Lum1553 nb-1 (one run) 602 nb-1 (4 runs) (store 2555, May 17th) (Store 1332, May 17th) • Best “CDF-week” 9.1 (pb-1)/10.3 (pb-1)2.97 (pb-1)/3.47 (pb-1) (most pb-1 to tape) (week of May 11th) (week of May 16th) • Best Store Efficiency 94.2% with Si (1 run)93.2% no Si (4 runs) (May 17th, 9.1 of 10.3 pb-1) (May 16th, 506 of 543 nb-1) DOE, July 23, 2003, P.Tipton

  14. Top Physics DOE, July 23, 2003, P.Tipton

  15. Search for Non-Standard tbW Vertex KM,BJK ^ { HW = J • P -1 Left handed F-(cos Ψ*l) ~(1 – cos Ψ*l) 2 0 LongitudinalF0(cos Ψ*l) ~(1 - cos Ψ*l 2) +1 Right handed F+(cos Ψ*l) ~(1 +cos Ψ*l)2 = M2lb = ½ (M2T – M2W)(1 + cosΨ*l) CDF Run I Preliminary Result: (Using ttbar dilepton, and lepton+jets events with 1 and 2 SVX b-tagged jets) fV+A= -0.21+0.42-0.25 ± 0.21 fV+A < 0.80 @ 95%CL 2000 pb-1 Run II : expected uncertainties ±0.1 (stat), ± 0.11 (sys) SM V-A Theory: 30% F- 70%F0 <0.04% F+ (Mb) fV+A : 0: corresponds to all V-A, (0 % right-handed W’s) 1: corresponds to all V+A (30% right-handed W’s) DOE, July 23, 2003, P.Tipton

  16. Df vs. ET N jets 2 / tt = 13.2  5.9stat  1.5sys  0.8lum pb NLO@ s=1.96 TeV for Mtop = 175 GeV‡: 6.70+0.71–0.88 pb - stt DileptonChannel: tt llbb Tipton’s Group contributed to all aspects of this analysis Run II Top Dilepton Summary Table: CDF Run II Preliminary - ‡ MLM ‡ hep-ph/0303085(ML Mangano et al) DOE, July 23, 2003, P.Tipton

  17. New Results in the Dilepton Channel A. Hocker new co-leader of Top Dilepton Group Approximately doubles our acceptance and Uses ~125pb-1 Not Yet ‘Blessed’ • Theoretical prediction: (6.7 +/- 0.5) pb DOE, July 23, 2003, P.Tipton

  18. Tau Dileptons: (e or m) t + jets • Motivation: t  b may have contributions not apparent in first and second generation dileptons • from either non-standard amplitudes or even from things other than top (e.g., high tanβ SUSY) • Problems: • jet to  fake rates are 1-2 orders of magnitude higher than e or μ •  not fully reconstructed, Z+jets background higher • McFarland’s Rochester group responsible for analysis(Demers’ thesis, Vaiciulis, Insler & Petruccelli – former REU students) • Recent progress: • reduced largest background in Run 1 by an order of magnitude by pseudo-reconstruction of the ditau mass (Demers, Petruccelli) • optimization of cuts to lower jet fake rate (Vaiciulis) • Expect 1st result this fall Z→+jets pseudo Mreconstruction DOE, July 23, 2003, P.Tipton

  19. Testing SM with Dilepton Kinematics:The PKS test 1: We plan to use the product of KS tests (PKS) to determine how consistent the kinematic features of the dilepton events are with the SM. 2: We devised an a-priori technique to handle a possible excess of events in the high-energy tails of kinematic distributions, like it was in Run I. The PKS method isolates a subset of most unlikely events and determines its significance. Missing Et : Run I dilepton sample DOE, July 23, 2003, P.Tipton

  20. Chosen kinematic variables. ttbar versus SUSY Angle between them Missing Et Flm Top Dilepton topological variable (goodness-of-fit from NWT) Pt of the leading lepton DOE, July 23, 2003, P.Tipton

  21. Electroweak Physics DOE, July 23, 2003, P.Tipton

  22. .B(Wee) ·B(We) = 2.640.01stat0.09sys0.16lum nb NNLO @ s=1.96 TeV‡: 2.69  0.10 nb W. Sakumoto,E. Halkiadakis, J.D. Lee, M.Coca, A. Hocker • Candidates: 38625 in ~ 72 pb-1 • Backgrounds ~6% (dominated by QCD) ‡ Nucl. Phys. B359,343 (1991) Phys.Rev. Lett. 88,201801 (2002) DOE, July 23, 2003, P.Tipton

  23. ·B(Z0ee) = 2676stat15sys16lum pb ·B(Z0mm) = 2466stat12sys15lum pb .B(Z0l+l-) Sakumoto, J.D.Lee, E. Halkiadakis VERY CLEAN • Candidates: 1830 in ~ 72 pb-1 • Backgrounds ~0.6% • Candidates: 1631 in ~ 72 pb-1 • Backgrounds: ~0.9% NNLO@ s=1.96 TeV‡: 252  9 pb ‡ Nucl. Phys. B359,343 (1991) Phys.Rev. Lett. 88,201801 (2002) DOE, July 23, 2003, P.Tipton

  24. W & Cross Sections vs. ECM Our new measurements NNLO DOE, July 23, 2003, P.Tipton

  25. PDG combined Exp PDG SM Theoretical prediction Measure (ppW)(W  e)(Z) R= (ppZ)(W)(Z  ee) Extract G(W) DOE, July 23, 2003, P.Tipton

  26. Analyses with W/Z/Drell-Yan Rates and Asymmetries • Run 1 (0.1 fb-1) Achievements of Rochester group • W lepton charge asymmetry (Bodek, Fan) • Reduced error on W Mass from PDF uncertainties from 100 to 15 MeV • Makes possible precision measurement of W mass at hadron colliders! • Use of Silicon to measure charge of forward electron tracks using extrapolation of track stubs in sillicon to shower centroid (Bodek, Fan) • Extended Z and Drell-Yan forward-backward asymmetry and rapidity distributions(Bodek, Sakumoto, Chung) • Asymmetry sensitive to Z’ or other high mass states (2 sigma discrepancy at high mass in Run 1 data) • Z rapidity constrains PDFs • Run 2 (2 fb-1) we are continuing this tradition of novel analyses with these samples • repeat Z rapidity (gain in statistics important) • high mass Drell-Yan (Z’ search), new W asymmetry technique DOE, July 23, 2003, P.Tipton

  27. Z/Drell-Yan FB Asymmetry Run I analysis - Bodek/Chung example of 500 GeV Z’ (E6 model) little observable rate effect, but large asymmetry change (Bodek, Baur) DOE, July 23, 2003, P.Tipton

  28. Drell-Yan: Z’ Search, Z-q couplings • Starting from this hint, we are proposing to combine rate AND asymmetry information to search for Z’ signal in Drell-Yan(Lee thesis, deLentdecker, McFarland) • leads to increased sensitivity • Can also use Drell-Yan FBasymmetry to probe for non-standard NC couplings of quarks(deLentdecker, McFarland) • complementary to NuTeV and atomic parity violation as precise probes of Z coupling to light quarks rate and asymmetry Discovery probability rate only DOE, July 23, 2003, P.Tipton

  29. Z Rapidity Distribution Run I analyses (Z- Bodek/Liu), (W - Bodek/Fan). Using plug electrons together with SVX tracking (Rochester plug-Rochester SVX group), MC shows definitive measurements of PDFs Z rapidity distributions and W asymmetry. 2 fb-1 Run 1 results are statistically limited; Chung/J. Han working on Run 2, particularly forward acceptance. Run II Analysis Bodek/Chung/J.Han DOE, July 23, 2003, P.Tipton

  30. W Charge Asymmetry Run 1 (Bodek, Fan): established d/u ratio of proton. However, measurements at high rapidity are difficult to interpret; sensitive to W pT Run 2 (Bodek, McFarland, B. Han, G.Yu): statistics will improve, but interpretation difficult. Need a new technique direct measurement of W rapidity! 2 fb-1, Run II analysis Bodek/McFarland/B.Han/Gyu DOE, July 23, 2003, P.Tipton

  31. Constraining PDFs : (d/u) with W asymmetry;(d+u) with y distribution for Z’s and W’s Measure W decay lepton charge asymmetry - V-A has opposite asymemtry. Unkown neutrino Z momentum yields two solutions for yw New technique Needed to Limit the Error on W Mass from PDFs uncertainties New technique to unfold the two yw solutions to get the true W production asymmetry -being developed by Bodek, McFarland- expected errors. Shown: U-quark carries more momentum than d-quark DOE, July 23, 2003, P.Tipton

  32. Conclusions • U or R continues to play an indispensable role in CDF • Our Contributions to Operations for Calorimetry, Silicon and Trigger/DAQ are essential to CDF data-taking • These put us at the top of CDF University groups with critical operational commitments • CDF physics program for Run II is broad and compelling, even if only 4fb-1 are collected • Many ways to make precision tests of the Standard Model in top and EWK sector. • UR led CDF physics program is also broad and compelling • marked by continued innovation DOE, July 23, 2003, P.Tipton

More Related