1. Kaori Maeshima Fermilab Jan. 12, 2005 @Waseda University Evolution: Search in High Mass Dilepton Channel in CDF Pre Run I Run 1A, Run 1B, and Run II...... Kaori Maeshima Fermilab at Waseda University, Jan 12, 2005

2. Kaori Maeshima Fermilab Jan. 12, 2005 @Waseda University Why Search in Dilepton (ee,  ) channel? ● Theoretically: Interesting physics -- many different theoretical predictions ● Experimentaly: relatively small and well understood background. Z, Z*,  *,  TC,  TC, e Z' or what? Discovery Potential! Dilepton invariant mass (M(ll))

3. Kaori Maeshima Fermilab Jan. 12, 2005 @Waseda University Why Search in Dilepton (ee,  ) channel? ● Theoretically: Interesting physics -- many different theoretical predictions we can test/search in this dilepton channel. – Extra dimension solutions to the Hierachy problem – Z' (higher gauge structure, -> U(1) ), E6, little Higgs model Z', SO(10), etc., etc.... – Technicolor model (r T, w T ) – RPV SUSY s-neutrino – lepton-quark compositeness –.....

4. Kaori Maeshima Fermilab Jan. 12, 2005 @Waseda University Why Search in Dilepton (ee,  ) channel? ● Experimentaly: relatively small and well understood background. ee 2 two isolated e, E T > 25 GeV 2 central e (CC) or 1 central and 1 forward e (CP) missing Et significance < 2.5  2 isolated  P T >20 GeV |   1 |<1, |   2 |<1.5 Cosmic ray rejection cuts Muon System COT Plug Calorimeter Time-of-Flight Central Calorimeters Solenoid Silicon Tracker |  | < 1 1<|  |<3 |  | < 1.5 |  | < 1 Selection cuts

5. Kaori Maeshima Fermilab Jan. 12, 2005 @Waseda University 00.9450 22.0400 94.6350 1411.1300 3026.7250 7170.5200 N obs N exp Mass (GeV/c 2 ) CC+CP High Mass Dielectrons Total of ~ 12500 dielectron candidates in 200 pb -1 data

6. Kaori Maeshima Fermilab Jan. 12, 2005 @Waseda University High Mass Dimuons High mass dilepton spectra is consistent with background prediction 11.24 ± 0.13500 11.79 ± 0.16450 01.03 ± 0.11550 5855.25 ± 2.50150 12.28 ± 0.19400 13.23 ± 0.24350 65.22 ± 0.32300 99.44 ± 0.49250 1820.88 ± 0.97200 N obs N exp Mass (GeV/c 2 ) Total of ~ 7500 dimuon candidates in 200 pb -1 data

7. Kaori Maeshima Fermilab Jan. 12, 2005 @Waseda University CDF (D0) Z' Published Papers ● CDF: “Measurement of the e+e- invariant-mass distributions in pbarp collisions at root-s = 1.8 TeV”, PRL 67, 2418 (1991) ● CDF: “Search for new gauge bosons in anti-p p collisions at root-s = 1.8 TeV”, PRL 68, 1463 (1992) ● CDF: “Search for new gauge bosons decaying into dielectrons in anti-p p collisions at root-s = 1.8 TeV”, PRD 51, 949 (1995) ● CDF: “Search for new gauge bosons decaying into dileptons in anti-p p collisions at root-s = 1.8 TeV”, PRL 79, 2192 (1997) ● D0: “Search for additional newtral gauge bosons”, PLB 385, 471 (1996) ● D0: “Search for heavy particles decaying into electron positron pairs in p anti-p collisions”, PRL 87, 061802 (2001)

8. Kaori Maeshima Fermilab Jan. 12, 2005 @Waseda University CDF (D0) Z' Published Papers ● CDF: “Measurement of the e+e- invariant-mass distributions in pbarp collisions at root-s = 1.8 TeV”, PRL 67, 2418 (1991),1988-1989 data, 4.05 pb-1, ee only, 387 Gev sm limit, compositness, 1310 fb limit. ● CDF: “Search for new gauge bosons in anti-p p collisions at root-s = 1.8 TeV”, PRL 68, 1463 (1992), 1988-1989 data, 4 pb-1, ee and mm, 4 E6 models, 412 GeV sm limit, compositness limits, 1000 fb limit ● CDF: “Search for new gauge bosons decaying into dielectrons in anti-p p collisions at root-s = 1.8 TeV”, PRD 51, 949 (1995), 1992-1993 data, 19.7 pb-1, ee only, 6 E6, 350 fb limit (> 350 GeV), 505 gev sm limit ● CDF: “Search for new gauge bosons decaying into dileptons in anti-p p collisions at root-s = 1.8 TeV”, PRL 79, 2192 (1997), 1992-1995 data, 110 pb-1, ee and mm, 690 sm limit, 40 fb limit, 6 E6 limits. ● D0: “Search for additional newtral gauge bosons”, PLB 385, 471 (1996), 1992-1993 data, 15 pb-1, 490 GeV sm limit, (sigZ'/sigZ) = 2.2*10-3, using sigZ(ee) = 218 pb (measuments of W and Z boson production cross section (run 1A), phys rev D 60, 052003, 1999, then, sigZ' limit = 480 fb ● D0: “Search for heavy particles decaying into electron positron pairs in p anti-p collisions”, PRL 87, 061802 (2001), 1992-1996 data, 124.8 pb-1 TC, Z', Z'sm limit below 670 GeV, ~70 fb limit 148 mm 406 ee 7234 ee 2566 mm 1371 ee

9. Kaori Maeshima Fermilab Jan. 12, 2005 @Waseda University Summary: CDF/D0 Z' results 88-89 ee only 88-89 ee and mm 92-93 ee only 92-95 ee and mm 2002-03, ee and mm 4 pb-1, 1000fb 200 pb-1, 20 fb 50 times data, 50 times better cross section limit, but... mass limits improve very slow because s dropps very fast.

10. Kaori Maeshima Fermilab Jan. 12, 2005 @Waseda University prospect of the search 50 times data, 50 times better cross section limit, but... mass limits improve very slow because s dropps very fast. ● Tevatron performance and prospect of Int. luminosity and it's affect for the search ● More Center of Mass Energy LHC

11. Kaori Maeshima Fermilab Jan. 12, 2005 @Waseda University Status: Current CDF Data Taking Intial Luminosity vs Store Number June 2001 RUN II 2002 20032004 2001 Jan. 2005 ● Going up ● Dips (shutdowns) ● #stores/year ● 1240 (2002) ● 770 (2004)

12. Kaori Maeshima Fermilab Jan. 12, 2005 @Waseda University Status: Current CDF Data Taking Intial Luminosity vs Store Number June 2001 RUN II 2002 20032004 2001 Jan. 2005 ● Going up ● Dips (shutdowns) ● #stores/year ● 1240 (2002) ● 770 (2004) Main cause of the sharp rise in the peak luminosity in 2004: alignment a huge difference in ave. store hours (much more stable operation). allow enough time to accumulate large stack of pbars

13. Kaori Maeshima Fermilab Jan. 12, 2005 @Waseda University Status: Current CDF Data Taking (cont.) Int. Lum vs Store Number June 2001 RUN II 2002 20032004 2001 Jan. 2005 ● Going up sharper ● Flats (shutdowns) ● #stores/year ● 1240 (2002) ● 770 (2004) Delivered To tape ~ 500 pb-1 on tape

14. Kaori Maeshima Fermilab Jan. 12, 2005 @Waseda University Status: Current CDF Data Taking (cont.) Data taking Efficiency vs Store Number June 2001 RUN II 2002 2003 2004 2001 Jan. 2005 ● Going up in 2002 ● Spreads, consistency ● Dips ● beam cond. ● w/wo Silicon ● Effort to sustain ● #stores/year ● 1240 (2002) ● 999 (2003) ● 770 (2004)

15. Kaori Maeshima Fermilab Jan. 12, 2005 @Waseda University Luminosity and Efficiency during a typical store ● run 182514 ● 2004.05.09 ● 57e30 lum begin ● 13e10 lum end ● 26 hours store ● 2.4 pb-1 delivered ● 2.1 pb-1 to tape ● 85% efficient The same duration of time at the beginning or the end of the store corresponds more than 3 times difference in luminosity.

16. Kaori Maeshima Fermilab Jan. 12, 2005 @Waseda University Operation is easier with the longer store hours The same duration of time at the beginning or the end of the store corresponds more than 3 times difference in luminosity. ● There are much more chance things go wrong at the beginning of the store. – luminosity is high ● high noise ● high trigger rate – start of a run after no beam period. Ops person comes to the conrol room beginning of each store. >30 hour store vs < 20 hours (shot setup ~ 3 hours).

17. Kaori Maeshima Fermilab Jan. 12, 2005 @Waseda University Status: Current CDF Data Taking (cont.) days Delivered and CDF Acquired Luminosity per FY in RUN II

18. Kaori Maeshima Fermilab Jan. 12, 2005 @Waseda University What to expect in FY2005 - 2009 summer 04 shutdown: electron cooling installed in the recycler FY05 run: commitioning electron cooling ( no gain from it, yet) summer 05 shutdown: 2 major items planed - D0 run 2B upgrade * L00 tracker * complete trigger upgrade - Reconfig C0 for BTeV (quite a big job) - reconfig. Accumulator (electron cooling must be working for this.) no more large stack after this. FY06 - FY 09: just take data with minor adjustment goal: 4.7 fb-1 (case: electron cooling not working) - 8.5 fb -1

19. Kaori Maeshima Fermilab Jan. 12, 2005 @Waseda University upgrade needed in CDF work in progress (modification are all to do with faster trigger-rate): SVT (~5 times faster readout. L2 rate: 250 - 800) Pulsar: running in pararell with alpha now XFT: reconfig. TDC: faster DSP code Event builder: 20 Mb/sec -> 60 Mb/sec pararell CSL

20. Kaori Maeshima Fermilab Jan. 12, 2005 @Waseda University prospect with 8.5 fb-1 88-89 ee only 88-89 ee and mm 92-93 ee only 92-95 ee and mm 2002-03, ee and mm 4 pb-1, 1000fb 200 pb-1, 20 fb 1000/(8500/4) = 0.47 fb good limit, but better to find one.