Search for Heavy, Long-Lived Neutralinos that Decay to Photons at CDF II Using Photon Timing
CDF 9171


P. Geffert*, M. Goncharov, E. Lee, R. Patel, D. Toback*, and P. Wagner - Texas A&M University
V. Krutelyov - UCSB

*Corresponding Authors
Analysis web page
Godparenting web page
Corresponding PRL page


Accepted by PRD
Phys. Rev. D 78, 032015 (2008) Final version (.pdf) (08/22/08)
Significant Changes Made due to Comments from the PRD Referee(.txt) (05/13/08)

Comments and Responses from PRD (.txt) (05/13/08)

Draft submitted to PRD (.pdf) (04/04/08)
Draft submitted to PRD: ( FERMILAB-PUB-08-078-E, arXiv:hep-ex/0804.1043)

Significant Changes Made due to Second Reading Comments(.txt) (03/31/08)

PRD version posted for the second reading by the collaboration:
CDF 9171 (.pdf) (02/27/08)
This is the Second Reading version for the Collaboration (Message to the collaboration), due date: March 14, 2008


Significant Changes Made due to First Reading Comments(.txt) (02/19/08)

PRD version posted for the first reading by the collaboration:
CDF 9171 (.pdf) (01/23/08)
This is the First Reading version for the Collaboration (Message to the collaboration), due date: Feb. 8 2008


Revision history before first reading First draft sent to the GPS (v0.0) (.pdf) (10/10/07)
Figures:
  1. Feynman diagrams of GMSB production processes
    (a) (01/13/08) (b) (01/13/08)
  2. (a) Schematics of a long-lived neutralino decay (08/20/07)
    (b) Predicted corrected time distribution for background and signal (12/05/07)
  3. (a) Definition of incident angle &alpha (03/21/08) (b) Definition of incident angle &beta (03/21/08)
  4. (a) Distribution of the total incident angle &psi (02/12/08)
  5. ID variable distributions for photons in a GMSB model
    (a) (Hadronic Energy)/(EM Energy) (07/16/08) (b) Isolation energy (03/21/08) (c) Ntracks (03/21/08)
    (d) pt (05/06/08) (e) Sum pt in a 0.4 cone (05/06/08) (f) 2nd cluster energy (03/21/08)
  6. (a) Total efficiencies for the standard photon ID requirements vs. &alpha (03/21/08)
    (b) vs. &beta (12/15/07)
  7. (a) Pmt asymmetry for the photon+MET sample and electrons from W&rarr enu events (11/12/07)
  8. (a) t0 of the highest sum-pt vertex in W&rarr enu events without allowing the electron track to participate in the vertexing (12/05/07)
    (b) The same but for z0 (12/05/07)
    (c) Vertex time vs. position using space-time clustering (12/05/07)
  9. (a) The difference in t between sets of tracks from the same vertex in the W&rarr enu dataset (12/13/07)
    (b) The difference in z for the same (02/14/08)
  10. (a) The difference in t between electron track and highest sum-pt vertex without the electron track participating in vertexing (12/05/07)
    (b) The difference in z for the same (12/05/07)
  11. The clustering efficiency using:
    (a) The subset method (12/05/07)
    (b) The window method (12/05/07)
    (c) As a function of sum-pt of the tracks using the window method (12/05/07)
  12. (a) A comparison of MC and data for the corrected times of electrons from a W&rarr enu sample (12/05/07)
  13. The corrected time distributions for electrons in a sample of W&rarr enu events
    (a) Total (02/20/08) (b) Right vertex (02/13/08) (c) Wrong vertex (02/13/08)
  14. (a) Mean time of arrival of electrons from subsamples of W&rarr enu+jets events (10/24/07)
    (a) RMS of the mean time of arrival of electrons from subsamples of W&rarr enu+jets events (11/12/07)
  15. (a) Corrected time distribution mean of electron from W&rarr enu events where the wrong vertex is picked (12/05/07)
    (b) Corrected time distribution RMS of electron from W&rarr enu events where the wrong vertex is picked (12/05/07)
  16. (a) Illustration of a beam halo event (03/20/08)
    (b) Illustration of a beam halo event with detector schematic (02/20/08)
  17. (a) The distribution of non-collision photons as a function of nEMTowers and nHADTowers (01/10/08)
  18. Non-collision background time distribution for:
    (a) Cosmics (08/06/07) (a) Beam Halo (08/06/07)
  19. (a) Number of beam halo photon candidates as a function of &phi position (05/06/08)
  20. (a) The expected 95% C.L. cross section limit as a function of corrected time (02/15/08)
  21. The corrected time distributions of expected signal and background and observed data
    (a) Over all control regions (12/05/07)
    (b) Zoomed in on the SM control region and signal region (12/05/07)
  22. Predicted and observed kinematic distributions for the signal region
    (a) Photon Et (12/05/07) (b) Jet Et (12/05/07) (c) Missing Et (12/05/07) (d) Delta phi (12/05/07)
  23. (a) Expected and observed cross section limits as a function of neutralino lifetime at a mass of 100 GeV (11/28/07)
    (b) Expected and observed cross section limits as a function of neutralino mass at a lifetime of 5 ns (11/28/07)
  24. (a) Contours of constant 95% C.L. cross section upper limit (11/30/07)
  25. (a) The expected and observed 95% C.L. exclusion region (04/03/08)
  26. (a) Predicted exclusion regions for multiple luminosities (04/03/08)
Tex files:
  1. llived_prd.tex: Main .tex file (05/19/08)
  2. July_2007_Authors_Visitors.tex: The Author List (05/16/08)
  3. abstract.tex: The Abstract (04/08/08)
  4. introduction.tex: The Introduction (05/02/08)
  5. emtiming.tex: Description of EMTiming at CDF (05/08/08)
  6. photonid.tex: Photon Identification and Timing (05/08/08)
  7. selection.tex: Triggers, Datasets and Event Preselection (05/02/08)
  8. background.tex: Background Events (05/13/08)
  9. acceff.tex: Acceptances to GMSB Events and Their Systematic Uncertainties (05/05/08)
  10. optimization.tex: Optimization of the search and Expected Sensitivity (05/05/08)
  11. results.tex: Data, Cross Section Limits and Final Results (07/16/08)
  12. conclusion.tex: The Conclusion (05/05/08)
  13. bibliography.tex: The Bibliography (05/05/08)
  14. definitions.tex: Defines various commands used in the text (02/20/08)
  15. colortab.tex: Package for shading or coloring with certain commands. (06/22/07)
  16. colortab.sty: For use with colortab.tex (06/25/07)
  17. fncylab.sty: Alters the structure of label references (06/25/07)
last updated by Paul Geffert on 08/22/08