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Summary of Moriond 2010 Part I. Tevatron

Summary of Moriond 2010 Part I. Tevatron. 이강영 ( 건국대학교 ). @ 연세대학교 2010. 4. 26. Rencontres de Moriond Since 1966 La Thuile, Aosta valley, Italy. Jean Tran Thanh Van. Theorists and experimentalists are brought together in a pleasant, relaxed and intimate atmosphere.

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Summary of Moriond 2010 Part I. Tevatron

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  1. Summary of Moriond 2010Part I. Tevatron 이강영 (건국대학교) @ 연세대학교 2010. 4. 26.

  2. Rencontres de Moriond Since 1966 La Thuile, Aosta valley, Italy Jean Tran Thanh Van

  3. Theorists and experimentalists are brought together in a pleasant, relaxed and intimate atmosphere. • 75 ordinary talks + 2 summary talks • 32 Young Scientist Forum • Ordinary talks of 15-30 min. are on invitation. • Young scientist forum talks are 7 min and only one question is allowed.

  4. Electroweak session • Tevatron results • LHC prospects (+a little results) • Neutrinos • And others including theory, flavour, dark matter, etc.

  5. Theoretical Issues on Higgs Productionat Tevatron

  6. Experimental Results on Higgs Physics at Tevatron

  7. Dr. Richard St. Denis Glasgow University On behalf of the CDF and D0 Collaborations Moriond 2010 Electroweak, La Thuile, Italy March 6-March 13, 2010 Tevatron Results on SM Higgs Search in the High Mass Region Outline • Search Foundation and Higgs detection modes • CDF and D0 detection methods in High Mass • Results, implications, next steps

  8. Higher Physics Reach Dms=17.77 ± 0.10 ± 0.07 Single Top Susy Higgs M M w t WZ New hadronic ZZ WW,WZ,ZZ Top (t) Top(ttbar) WZ Bottom Jets Build on mountain of measurements

  9. Low Mass High Mass SM Higgs Production and Decay • Trigger: 1 High Pt e or m • Focus on Decays: WW → ee, em, mm, et, mt + n’s • Separate channels by dileptons (D0), Njets (CDF) • Event Selection: High Pt Leptons, Missing ET Gluon Fusion (dominates) Associated production Vector Boson Fusion

  10. ww Df ll Df ll Z/g HWW Production Features nm • High Pt Leptons not back to back • Spin 0 Higgs correlates spins of leptons: charged leptons (low Df ll), two neutrinos (High MET) tend to be closely aligned with one another. g W+ m+ H0 W- g e- ne Backgrounds

  11. High Pt e,m Isolation Met,Mll Lo <2Jet Hi 0jet 1Jet >1Jet WW Df,DR,Ht… H M ll (CDF) Discr. Ana Wg H Wg t H B t H H Z/g WW Z/g H Z/g H t t WW WW WW Heavy Flavor Z/g H H DrellYan WW/Wg/top H-Enhanced WW H

  12. Same sign Dileptons(CDF/D0), Trileptons(CDF) No Rate? Too Low? No! New l+ • Same Sign dileptons: • WH: W(jj)W*(ln)W(ln), • ll(l) nnn • ZH: Z(jj)llnn,W(jj)ll(l) nn,… • Trileptons: • WH:lllnnn • ZH:Z(ll)W(qq)W(l) n W+ nl W+ q q H0 l- l- W+ H0 q W- W- nl q nl l+ l+ W+ q q nl q q Z0 Different Channel Different Systematics Z0 No Channel Left Behind l-

  13. arXiv: 1001.4468 CDF 4.8 fb-1 V. M. Abazov et al. (DØ Collaboration), Phys. Rev. Lett. 104, 061804 (2010). @165: Expected 1.20 @165: Expected 1.36 Observed 1.29 Observed 1.55 T. Aaltonen et al. (CDF Collaboration), Phys. Rev. Lett. 104, 061803 (2010). arXiv:1001.4481 SM Sensitivity: 159-169 GeV/c2! + SM Exclusion: 162-166 GeV/c2! arXiv: 1001.4162. T. Aaltonen et al., (CDF and DØ Collaborations), Phys. Rev. Lett. 104, 061802 (2010).

  14. New Improvements Over Publication • 4.8→5.3 fb-1: 5% better • Optimized e- selection • Add Trileptons, Low Mll ,VH, VBF for 0 Jet • All together: 15% better! • Improvements continue (t modes add a few %)

  15. Next:Extend sensitivity 146-183 136-190

  16. Summary • “No channel too small” strategy successful: different, backgrounds, systematics, S/B and many channels. • Combined Tevatron results exclude the Standard Model Higgs at 95% CL for 162≤ MH ≤ 166 GeV/c2. • Updated CDF results: sensitivity close to 95% CL exclusion for MH=160-165 GeV/c2. • The High mass sensitivity will be expanded: 2xCDF gives 146-183 GeV/c2 if no improvements, 136-190 GeV/c2 with improvements. • Both experiments have 8 fb-1 delivered! • These are remarkable times. Rapid changes in data collected and analysis continue.

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