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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,

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University of Rochester Participation in CDF

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University of rochester participation in cdf

University of RochesterParticipation inCDF

DOE, July 23, 2003, P.Tipton



  • 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

Current cdf group members

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

The rochester cdf group

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

    Rochester s three areas of focus and operational responsibility

    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

    Cdf plug operations

    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

    Rochester silicon operations

    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

    Rochester silicon operations cont

    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

    3 rd area of focus level 3 data hub mcfarland

    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

    Level 3 data hub operations

    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

    Current level 3 data hub development

    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

    Cdf data taking

    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

    Great progress in one year

    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

    University of rochester participation in cdf

    Top Physics

    DOE, July 23, 2003, P.Tipton

    Search for non standard tbw vertex km bjk

    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-


    <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

    S tt dilepton channel tt l l bb

    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

    New results in the dilepton channel

    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

    Tau dileptons e or m t jets

    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


    pseudo Mreconstruction

    DOE, July 23, 2003, P.Tipton

    Testing sm with dilepton kinematics the pks test

    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

    Chosen kinematic variables ttbar versus susy

    Chosen kinematic variables. ttbar versus SUSY

    Angle between them

    Missing Et


    Top Dilepton topological variable

    (goodness-of-fit from NWT)

    Pt of the leading lepton

    DOE, July 23, 2003, P.Tipton

    University of rochester participation in cdf

    Electroweak Physics

    DOE, July 23, 2003, P.Tipton

    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

    B z 0 l l

    ·B(Z0ee) = 2676stat15sys16lum pb

    ·B(Z0mm) = 2466stat12sys15lum pb


    Sakumoto, J.D.Lee, E. Halkiadakis



    • 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

    W cross sections vs e cm

    W & Cross Sections vs. ECM

    Our new measurements


    DOE, July 23, 2003, P.Tipton

    University of rochester participation in cdf


    combined Exp






    (ppW)(W  e)(Z)


    (ppZ)(W)(Z  ee)



    DOE, July 23, 2003, P.Tipton

    Analyses with w z drell yan rates and asymmetries

    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

    Z drell yan fb asymmetry

    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

    Drell yan z search z q couplings

    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

    Z rapidity distribution

    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

    W charge asymmetry

    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

    Constraining pdfs d u with w asymmetry d u with y distribution for z s and w s

    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



    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



    • 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

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