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CDF B /Higgs Physics and Tracking

CDF B /Higgs Physics and Tracking. Matthew Herndon, May 2007 University of Wisconsin Wisconsin DOE Review. B Physics Tracking Higgs Physics. BEACH 04. J. Piedra. 1. CDF B Physics Group. One of the major goals of the Tevatron accomplished!. B physics group activities

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CDF B /Higgs Physics and Tracking

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  1. CDF B/Higgs Physics and Tracking Matthew Herndon, May 2007 University of Wisconsin Wisconsin DOE Review • B Physics • Tracking • Higgs Physics BEACH 04 J. Piedra 1

  2. CDF B Physics Group One of the major goals of the Tevatron accomplished! • B physics group activities • B and Charm Physics • Led for 2005-2006 by Matthew Herndon and Stefano Giagu/Kevin Pitts • 200 active members and 50 ongoing analysis • Analysis 2005-2006 • 60 preliminary new results • 20 published results • Some of the most interesting published and preliminary results • Discovery of b baryons Thesis of new Wisconsin Postdoc Jennifer Pursley • Bs +- Analysis with Prof. Matthew Herndon • Observation Bs - Bs Oscillations Analysis with Prof. Matthew Herndon Wisconsin Doe Review 2007 M. Herndon 2

  3. New B Baryons Jennifer Pursley and Collaborators • Lb only established b baryon - LEP/Tevatron • Tevatron: large cross section and samples of Lb baryons • First possible new heavy b baryon: • Predictions from HQET, Lattice QCD, potential models, sum rules… = 3/2+(Sb*) Sb: b{qq}, q = u,d; JP = SQ + sqq = 1/2+ (Sb) Wisconsin Doe Review 2007 M. Herndon 3

  4. bReconstruction • Strategy: • Establish a large sample of Lb decays with an optimized selection and search for:b+Lb+ Builds off PRL 98, 061802 2007 b: Nb = 3184 • Estimate backgrounds: • Random Hadronization tracks • Other B hadrons • Combinatoric • Extract signal in combined fit of Q distribution Wisconsin Doe Review 2007 M. Herndon 4

  5. bObservation In collaboration review for publication > 5s significance • Observe Sb signal for all four expected Sb states • Mass differences Wisconsin Doe Review 2007 M. Herndon 5

  6. Bs(d)→ μ+μ- Matt Herndon and Collaborators 9.8 X 107B+ events • Decay suppressed in SM • BF(Bs→μ+μ-) = 3.5x10-9 • May have 3 order of magnitude enhancement in new physics models • Relative normalization search • Measure the rate of Bs(d)→ μ+μ-decays relative to BJ/K+ • Takes advantage of CDFs excellent muon trigger 400pb-1 Wisconsin Doe Review 2007 M. Herndon 6

  7. Bs(d)→ μ+μ-SearchResults With summer graduate student Mike Glatzmaier BF(Bs +- ) < 1.0x10-7 at 95% CL BF(Bd +- ) < 3.0x10-8 at 95% CL CDF Result: 1(2) Bs(d)candidates observedconsistent with background expectation CDF 2 Bs result: 7.510-7 CDF 2 Bs result: 2.010-7 PRL 93, 032001 2004 PRL 95, 221805 2005 Working on update for Lepton-Photon: Expected sensitivity 4.0x10-8 10X the SM Wisconsin Doe Review 2007 M. Herndon 7

  8. Bs Mixing: Overview Matt Herndon Wisconsin contribution Wisconsin contribution - • Measurement of the rate of conversion from matter to antimatter: Bs Bs • Determine b meson flavor at production, how long it lived, and flavor at decay to see if it changed! tag Bs p(t)=(1 ± D cos mst) Wisconsin Doe Review 2007 M. Herndon 8

  9. Bs Mixing: Signals and Tagging BMU Used Here • Fully reconstructed decays: Bs Ds(2), where Ds, K*K, 3 • Also partially reconstructed decays: one particle missing • Semileptonic decays: Bs DslX 9

  10. Bs Mixing: Proper Time Resolution • Measurement critically dependent on proper time resolution • Full reconstructed events have excellent proper time resolution • Partially reconstructed events have worse resolution • Momentum necessary to convert from decay length to proper time M. Herndon 10

  11. Bs Mixing: Results March 2005 April 2006: Use 1fb-1 Data Add PID and NNs Nov 2005: Add Ds-3 and lower momentum Ds-l+ March 2006: Add L00 and SST Wisconsin Doe Review 2007 11

  12. Bs Oscillations: L00 Impact CDF Bs Oscillations Sensitivity  L = 1fb-1 A 95% CL sensitivity Without L00 3 sensitivity With L00 5 sensitivity Observed value of ms With L00 should reach 5! ms • Difficult detector to use - only now being fully utilized in analysis • L00s primary effect is to improve proper time resolution • Improves proper time resolution by 20%: 109fs to 87fs Wisconsin Doe Review 2007 M. Herndon 12

  13. Bs Mixing: Results A >5 Observation! Can we see the oscillation? 2.8THz PRL 97, 242003 2006 PRL 97, 062003 2006 M. Herndon 13

  14. Bs Mixing: CKM Triangle CDF |Vtd| / |Vts| = 0.2060  0.0007 (stat + syst) +0.0081(lat. QCD) -0.0060 ms = 17.77  0.10 (stat)  0.07 (syst) ps-1 14

  15. Silicon Only Tracking Matt Herndon and Jason Nett 80% TDR  • Silicon Standalone Tracking: SiSA • Algorithm • Use two outer 3D points(r-phi + SAS) and vertex to find initial helix. Gives helix and constraint in z. • Cooling problems, wire bond oscillation, chip failures, beam incidents effect stereo side disproportionately • SiSA Performance is suboptimal: New algo’s that use less stereo information and COT IO Tracking: NIM A538, 249 2005 Wisconsin Doe Review 2007 M. Herndon 15

  16. Z  ee: Efficiency With COT Hits • Silicon efficiency relative to the calorimeter • Good resolution! • New forward silicon tracking algorithms will enhance sensitivity • Excellent for lepton finding • Most forward tracks  < 1.7 have silicon and drift chamber hits. Good pt and impact parameter resolution for b tagging Wisconsin Doe Review 2007 M. Herndon 16

  17. Z : Efficiency • Tight central muon with forward stub With Jim Bellinger and Bob Handler • Black efficiency,Blue Si || COT acc. • Electrons difficult to track due to Brehm • Efficiency for IMU muons used in mixing analysis was excellent Wisconsin Doe Review 2007 M. Herndon 17

  18. CDF Higgs Physics Group Wisconsin Expects to make an impact with tracking work applied to lepton identification and b tagging • Higgs Discovery Group - Newly formed as of 2007 • Led by Matthew Herndon and Mark Kruse • Scope: SM and SUSY Higgs physics and related SM background channels • Similar manpower and effort to B physics group! • Focus • Equally on technical issues and analysis improvements • Technical subgroups: Higgs Trigger, Jet and MET Energy Resolution, Lepton Id, and b quark tagging • Analysis level efforts on use of advanced analysis techniques and understanding of backgrounds Wisconsin Doe Review 2007 M. Herndon 18

  19. Where We Are Matt Herndon Jen Pursley Matt Herndon Jason Nett Recent thesis of Sunny Chuang advised by Duncan Carlsmith SM Higgs is within reach. Limits or the hint of a signal • Current status of the CDF SM Higgs Analysis • Current major players • Low mass • WH  lbb • ZH bb • ZH llbb • High Mass • H  WW  ll • Many analysis improvements under development and other channels add to sensitivity: ttH ttbb, VH  qqbb, WH  WWW, … PRL 97, 081802 (2006) Wisconsin Doe Review 2007 M. Herndon 19

  20. How Analysis can be Improved Development of New Triggers New Lepton Types Advanced Lepton Id b quark tagging b jet resolution Advanced  Id Expanded use of triggers MET resolution Advanced Analysis Techniques WH  lbb ZH bb ZH llbb H  WW  ll A  … Jason Nett working on BMU based Higgs trigger and forward b tagging Jennifer Pursley will concentrate on forward lepton finding Goal: make substantial improvements to key high and low mass Higgs searches Wisconsin Doe Review 2007 M. Herndon 20

  21. Conclusion • Tevatron making large gains in our understanding of B Physics • Concentrating on areas where there might be hints of new physics and discovering new particles • Observation of Bs - Bs Oscillations • Potential for Standard Model Higgs searches looks good • Can set limits on full SM mass range and maybe see a hint of signal • Forward tracking will substantially enhance Higgs sensitivity • Will be used to reprocess 2fb-1 datasets Signal at >5 level. One of the major Tevatron goals accomplished ms = 17.77  0.10 (stat)  0.07 (syst) ps-1 Let’s accomplish another of the major Tevatron goals! Wisconsin Doe Review 2007 M. Herndon 21

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