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Discover the Heavy Top Partner in the LR-Twin Higgs Model at the LHC

Discover the Heavy Top Partner in the LR-Twin Higgs Model at the LHC. Xinyu Miao, Shufang Su University of Arizona 05/08/07. TexPoint fonts used in EMF. Read the TexPoint manual before you delete this box.: A A A A A A A A A A. Outline. Twinhiggs Model Twin Higgs Mechanism

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Discover the Heavy Top Partner in the LR-Twin Higgs Model at the LHC

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  1. Discover the Heavy Top Partner in the LR-Twin Higgs Model at the LHC Xinyu Miao, Shufang Su University of Arizona 05/08/07 TexPoint fonts used in EMF. Read the TexPoint manual before you delete this box.: AAAAAAAAAA

  2. Outline • Twinhiggs Model • Twin Higgs Mechanism • Introduce the Heave Top quark • New Particles • Heavy Top Quark @ LHC • Production • Decay • Background • Signal + Background @LHC

  3. Twinhiggs Mechanism: Linear Realization SM Higgs doublet EWSB ! SM Higgs U(4) !U(3) SU(2)L£SU(2)R£U(1)B-L!SU(2)L£U(1)Y Z. Chacko, Hock-seng Goh, Roni Harnik, JHEP 0601:108,2006

  4. gL = gR = g Natural for f ~ TeV U(4) invariant, Doesn’t contribute to GB mass TH Mechanism: Linear Realization Contd … Z. Chacko, Hock-seng Goh, Roni Harnik, JHEP 0601:108,2006

  5. 3 eaten by heavy gauge bosons 3 Higgses: 0, ± SU(2)L Higgs doublet H1±, H20 ^ ^ Dark matter candidate Twinhiggs Mechanism: Linear Realization SM Higgs doublet EWSB ! SM Higgs U(4)£U(4) !U(3) £U(3) SU(2)L£SU(2)R£U(1)B-L!SU(2)L£U(1)Y Only couples to Gauge bosons. Z. Chacko, Hock-seng Goh, Roni Harnik, JHEP 0601:108,2006

  6. LL = (, e)L = [2, 1, -1] QL = (u, d)L = [2, 1, 1/3] QR = (u, d)R = [1, 2, 1/3] LR = (, e)R = [1, 2, -1] TL = [1, 1, 4/3] TR = [1, 1, 4/3] Heavy Top Quark: tH Yukawa coupling ~ 1 for SM top quark. M: mixing parameter of TL with TR. Mass eigenstates: SM top and tH Z. Chacko, Hock-seng Goh, Roni Harnik, JHEP 0601:108,2006

  7. Heavy gauge bosons:WH, ZH m2WH,ZH g2(f12+f22) • Heavy top:tH m2TH M2+y2f12 • Other SU(2)R Higgses:m2  g4/(162)f22 log(/gf2) 0m20  B (f2/f1) B: small, (50-100 GeV)2 • Other SU(2)L Higgs H1m2H1, H20  H20: soft symmetry breaking, O(f1) ^ ^ New Particles

  8. Single tH production Pair production tH production Hock-seng Goh, Shufang Su, Phys.Rev.D75:075010,2007

  9. 3 b + 1 j + 1 lepton + missing ET j b W b  l t tH b  tH decay

  10. (after standard cuts) Background

  11. f1 =1TeV σ(fb) / 20 GeV Signal + Background @ LHC • lepton (e or μ) with pT > 30 GeV, |η|<2.5 • all jets with pT > 50 GeV, 4Rjj >0.4, 4Rjl >0.4 • at least one jet with pT > 550 GeV Preliminary results Need more background data.

  12. L-R twin Higgs model: • Quadratic divergence forbidden by left-right symmetry • New Particles: • Heavy gauge bosons: WH, ZH • Heavy top quark: tH • New Higgses: , 0 ,H1 ,H20 • Heavy top @ LHC • Signal: 3 b + 1 j + 1 lepton + missing ET • Background: tt~, w+4j • Future work • Identify Twin Higgs mechanism • Distinguish from i.e. little Higgs ^ ^ Conclusion

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