1 / 18

Latest PRELIMINARY Results from Run 2 at DØ

Latest PRELIMINARY Results from Run 2 at DØ. Last updated – Jan. 11, 2002 Boaz Klima (klima@fnal.gov). Z  e + e - Candidates. 2 EM objects, E T > 20 GeV, isolation and shower shape cuts. L ~1.2pb -1. e. e. (uncalibrated energy scale). Leo Chan, Rochester. W  e Candidates.

brynne-hebert
Download Presentation

Latest PRELIMINARY Results from Run 2 at DØ

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. Latest PRELIMINARY Results from Run 2 at DØ Last updated – Jan. 11, 2002 Boaz Klima (klima@fnal.gov)

  2. Z  e+e- Candidates 2 EM objects, ET > 20 GeV, isolation and shower shape cuts L~1.2pb-1 e e (uncalibrated energy scale) Leo Chan, Rochester

  3. W e Candidates Vishnu Zutshi, NIU Leo Chan, Rochester ET e EM cluster with track mT(e,n) L~0.7pb-1 (uncalibrated energy scale) EM cluster with track

  4. Higgs Candidate (just kidding…) DØ W + 2 jet candidate Jet 1 ETraw = 17 GeV* ET Electron Electron Jet 1 Jet 2 Jet 2 ETraw = 13 GeV* * Jet ET corrections will be relatively large

  5. Z  m+m-Candidate • Two muons recoiling against a jet • Dimuon invariant mass ~ 55 GeV (with large uncertainty) Onne Peters NIKHEF

  6. J/+- Di-muons reconstructed in the forward region Roger Moore and Adam Yurkewicz, MSU

  7. Muons in Jets Onne Peters, NIKHEF Back to back calorimeter jets Muon in jet (b candidate?) Hits in A,B,C layers

  8. bb (b  m)Candidate Two jets tagged with muons • Jet 1: ET ~ 18 GeV, pTm ~ 7.4 GeV, pTrel ~ .30 GeV • Jet 2: ET ~ 13 GeV, pTm ~ 5.4 GeV, pTrel ~ .24 GeV • …and in case you wonder, Mmm ~ 12 GeV and Mjj ~ 29 GeV R-Z view X-Y view 3-D view

  9. Muons and Jets Onne Peters, NIKHEF Muon + Jet cross section (partially corrected) PTRel Distribution (using Run 1 templates)

  10. Jetty Events Using R=0.7 Cone Algorithm with Run 1 corrections Alexander Kupco, Prague • 3-jet event • ETjet1~310GeV • ETjet2~240GeV • ETjet3~110GeV • ET~8GeV • 2-jet event • ETjet1~230GeV • ETjet2~190GeV

  11. Jet Distributions Using R=0.7 Cone Algorithm (energies partially corrected) Alexander Kupco, Prague Dijet Invariant Mass Single Jet PT

  12. Jet Energy Calibration Ia Iashvili, Riverside Calorimeter Response in CC+EC  jet Pre-shutdown Data Post-shutdown Data E' = ETgxcosh(hjet)

  13. J/e+e- Di-electrons reconstructed in CFT and SMT Sergey Burdin, LAL (uncalibrated EM energy scale)

  14. EM Energy Calibration Marie-Claude Cousinou, Marseille Data - before Correction Data - after Correction Monte Carlo P3=0.959 corresponds to a mass of 87.5 GeV

  15. Ksp+p- Tracks reconstructed in the SMT detector Brad Abbott, Oklahoma Black histogram – opposite-sign tracks Red histogram – same-sign tracks Dotted curve – fit to background Full curve – fit to signal + background

  16. Ks(p+p-) Lifetime Tracks reconstructed in the SMT detector Ariel Schwartzman, Buenos Aires l( )

  17. Hits in SMT and CFT Avto Kharchilava, Notre Dame

  18. Level 3 Calorimeter Trigger EM clusters, pT > 10 GeV Isolated, EM fraction > 0.9 || < 1.1 Jets, pT > 15 GeV R = 0.7 cone || < 1.1 fail (prescaled) fail (prescaled) pass pass Volker Buescher, Mainz

More Related