Trigger Upgrades, Hardware and Heavy Flavor Physics at CDF

1. Trigger Upgrades, Hardware and Heavy Flavor Physics at CDF http://www.physics.purdue.edu/~mjones/talks/mjones_cdf_Aug19_2009.ppt • Level 2 calorimeter trigger • Di-boson production • Time-of-Flight • correlations • , • ¨ production? Trigger Upgrades Matthew Jones (Assistant Professor) Gene Flanagan (Postdoc) Niharika Ranjan (Graduate student, M. Jones) Nishanth Sasanka (Undergarduate, M. Jones) Heavy Flavor Physics 2009 DOE site visit

2. Trigger Upgrades • Almost all events recorded by CDF require tracks or jets in the Level 1 trigger. • Trigger bandwidth has remained approximately constant. c. 2004 today • Level 1 track trigger upgrade • Confirm tracks using stereo superlayers • Integrated into standard trigger table • Level 2 calorimeter trigger upgrade • Fast energy clustering in software • Also integrated into standard trigger table Completed, spring 2007 Completed, spring 2008 2009 DOE site visit

3. Improved ET and ET resolution: Increased ZH/WH acceptance: Doubled the acceptance for a 120 GeV Higgs Now 60-70% compared with 20-30% using hardware energy clustering. Level 2 Calorimeter Upgrade 2009 DOE site visit

4. An application: Di-boson production • Topologically similar to WH/ZH production • The Higgs peak would emerge as a (small) bump on a (large) di-jet background: • Dataset: 3.5 fb-1 using multiple ET triggers • Require ET > 60 GeV + 2 jets 2009 DOE site visit

5. Di-boson production • Remaining QCD background from mismeasured jet energies – constrain using ET calculated using charged tracks (stat) (syst) (lumi) 5.3σ significance Submitted to Phys. Rev. Lett. 2009 DOE site visit

6. Provides particle ID when pT<1.5 GeV/c Same Side Kaon Tag (Δms): still relevant for ACP in BsJ/ψφ Fragmentation studies Past institutional involvement: Penn, MIT, FNAL, Berkeley, Japan, Italy, Korea, Spain No longer providing pager coverage: Integrated with calorimeter support. Main operational issues: On-line hardware/software maintenance Calibration at high luminosities PMT aging issues (with UCL + Tsukuba) Calculated new HV settings to restore efficiency Measured degradation in attenuation length (CDF note 9855) Time-of-Flight Operations 2009 DOE site visit

7. Same-side kaon tag works very well. Why? Reconstruct D+s/D+φK+ Statistically isolate prompt component (CDF Note 9749) Parameterize TOF response using pure pion sample from D*+ decays. Measure K,π,p fractions in cone around D Compare with Pythia fragmentation models. Proceeding with blessing the analysis in B group. D+K± and D+sK± correlations 2009 DOE site visit

8. CP-Even decays B0sJ/ψη • Interesting new decay channel... • is a challenging at CDF: • Low ET photons • Calorimeter alignment • Strip chamber response • Detailed parameterization of low energy calorimeter response using conversion sample • Blind analysis optimization suggested we might have 84 signal events (6.7 sigma). 2009 DOE site visit

9. CP-Even decays BsJ/ψη • Significance is lower than expected. • important to check photon reconstruction using a calibration sample. CDF B-group meeting: July 10, 2009 2009 DOE site visit

10. Connection with ¨ analysis • Suggests that an production cross section measurement would be useful and natural. ∫ Ldt = 2.6 fb-1 ∫ Ldt = 90 pb-1 from Run I 2009 DOE site visit

11. Undergraduate Involvement • Feasibility of search for ? • Summer project for Nishanth Sasanka (Purdue sophomore): • Apply photon reconstruction tools to signal Monte Carlo, study background in sidebands • Optimize photon selection • Expect a limit of Br < 1.6x10-5 @ 90% CL. • One theory calculates Br ~ 1.4x10-6... • Sensitivity to new physics? 2009 DOE site visit

12. Summary • Purdue continues to make important contributions to trigger upgrades and detector operations. • Heavy Flavor and high pT Physics Analysis • The data samples available are large • The detector is well understood • Now serving as convener of B production and decay subgroup 2009 DOE site visit