1 / 12

CDF Results

CDF Results. Andrew Mehta. Liverpool Christmas Meeting 2008. Tevatron. Tevatron is running really well :. Lumi per experiment. Analyses in this talk use 0.9 - 2.7 fb -1 per experiment. Expect 6-8 fb -1 datasets by end of 2009 + possibly run in 2010.

hogan
Download Presentation

CDF Results

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. CDF Results Andrew Mehta Liverpool Christmas Meeting 2008

  2. Tevatron • Tevatron is running really well: Lumi per experiment Analyses in this talk use 0.9 - 2.7 fb-1 per experiment Expect 6-8 fb-1 datasets by end of 2009 + possibly run in 2010 Data analysed with 2 multipurpose detectors CDF and D0: EM +had calorimeters for e +jet id Muon detectors Silicon vertex detectors for b tagging Andrew Mehta

  3. The Challenge at to find new physics QCD jet production is huge. Must be understood before we can Investigate rare processes Andrew Mehta

  4. QCD Z/γ+bjet Photon Z Sys. errors reduced In publication Andy Tara Photon agrees well with LO MCs. No NLO available yet. Publication soon (waiting for MC comparison for data at lower Et). Z+bjet has NLO comparison. Better agreement obtained if we lower the scale in the calculation. Paper just submitted. Andrew Mehta

  5. Search for chargino-neutralino production in 3 lepton final states Giulia No signal found in this or other channels set limits e.g. for MSSM no-mix chargino mass<150 GeV is excluded Paper published this year. Andrew Mehta

  6. Top /W Mass Top mass is still a very active topic - 7 New results in 2008 from CDF Summer CDF/D0 combination: 172.4 ± 0.7(stat) ± 1.0(syst) GeV/c2 Already beat the Run II goal Really want to improve W mass. No results yet but work going on Very difficult analysis! Andrew Mehta

  7. Higgs Production at the Tevatron and Decay Tevatron s=1.96 TeV Higgs Production Cross Section [pb] Higgs Branching Ratio Hxx ttH Main channels at low mH<140 GeV Main channels at low mH>140 GeV WH  lvbb ZH  llbb, vvbb H  WW Dominant gg H, H  bb has massive background Andrew Mehta

  8. Higgs Tevatron Combination - Status of April 9th 2008 - Summer 2008 Updated Tevatron Combination in progress! Andy Tevatron for the first time can exclude a Higgs at 95% CL, albeit with a tiny mass range. Publication of channel we worked on (ZH, Z→ll,H→bb) this year+ First use of H1 track+jet algorithm Andrew Mehta

  9. Muon Event Paper CDF produced a paper investigating reconstructed muons with large impact parameters Hint in paper is that these cannot be explained by SM processes. Obvious SM explanations are in flight decays of K , Ks,π, punchthrough These effects ‘account for half of the events but given the size of the uncertainty we cannot exclude that all events can be accounted for’ (paraphrased from paper) Paper then looks at a sample of these ‘muons’ produced very close to an additional ‘muon’ (hadronicpunchthrough?) Study of multi-muon events produced in p-pbar collisions at sqrt(s)=1.96 TeV.By CDF Collaboration (T. Aaltonen et al.). FERMILAB-PUB-08-046-E, Oct 2008. 70pp. Submitted to Phys.Rev.D e-Print: arXiv:0810.5357 [hep-ex] Andrew Mehta

  10. Muon Event Paper • Liverpool and at least 1/3 of collaboration removed names from paper because: • We did not think analysis was complete. Many obvious checks not performed. • Many internal results conflicted with results in paper. • Many experts disagreed with statements in paper. • Most calculations back of the envelope. No full simulation of jets comparison with data. • Paper very badly written + organised in the chronological order of work done rather than in a logical order • Paper has an undertone of new physics throughout, when most of us feel effects (if there are any) are due to detector, simulation or soft physics uncertainties • Paper did not go through the usual CDF procedures Will be interesting to see what external referee thinks Andrew Mehta

  11. Summary • Tevatron running well. Producing lots of data and lots of publications. • Liverpool group is small but has still achieve a lot in the past year in QCD+ SUSY+Higgs searches • Top mass now at very good precision. Hope for an improvement in the W mass soon • Have excluded a SM Higgs mass for the first time • Expect 2-3 times current analyzed lumi (more if we run in 2010) Andrew Mehta

  12. Summary of Analyses in low mass region mH=115 GeV/c2 (mH=120 GeV) Also WW contributes in the low mass region Andrew Mehta

More Related