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the Fourth Generation

Thoughts and Directions. on. the Fourth Generation. October 23, 2011, 3-B3GSM @ BOUN. diaz site !!! at http://flickr.com/photos/7339233@N05/ 1843725867. Outline. I. Intro:

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the Fourth Generation

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  1. Thoughts and Directions on the Fourth Generation October 23, 2011, 3-B3GSM@ BOUN diaz site !!! at http://flickr.com/photos/7339233@N05/ 1843725867

  2. Outline I. Intro: Capri’08; 1st BSM3 & 4 Statements; 2nd BSM3; Summer’11 II. From Hintsto Measurements:Indirect/Direct Bs→ J/yf/ Bs→ mm/ B→K*mm║mt;BR(t→bW*) III. Enhancing Small Numbers nEDM4;BAU4 IV. Breaking the Unitarity “Bound” Yukawa-bound Ultra Heavy “Mesons”— Relativ. Bound State Issues; Lattice; [“Bootstrap” Gap Equation V. Conclusion

  3. I. Intro arXiv:0805.4393 [hep-ph]

  4. ~ 133 citations today

  5. http://indico.cern.ch/conferenceDisplay.py?confId=68036 Summarized this morning.

  6. sin2FBs~ -0.5 --0.7 sin2FBs ~ -0.33 WSH, Nagashima, Soddu, PRD’07 WSH, Ma, arXiv:1004.2186 [hep-ph] (already in 05) sin2FBs ≡ sinfs≡ -sin2bs Also, Soni et al., arXiv:1002.0595 [hep-ph] Buras et al. arXiv:1002.2126 [hep-ph] Lenz et al., arXiv:1005.3505 [hep-ph] 4th generation “prediction” still robust, but needs LHCb to verify. curios 1.2s too

  7. B Physics Results from the LHC Gerhard Raven LP11 Practically All Flavor/CPV Hints are “Gone” !!

  8. II. From Hintsto Measurements:Indirect/Direct Measuring CKM4 Solely @ LHC t, t ’ , t’ t, t ’

  9. Andrei: Do you like the 1 fb-1 number I gave, George? George: Well, perhaps -0.3  0.1 better fs ~ -0.83 [sinfs ~ -0.74] Andrei Golutvin @

  10. 7.0  2.4 x 10-9 reachable w/ 1 fb-1 ? Add ATLAS/CMS ! CERN RRB April 2011

  11. B Physics Results from the LHC Gerhard Raven LP11 Getting Interesting: 4G could enhance Bs→ mmby ~ 2 !

  12. B Physics Results from the LHC Gerhard Raven LP11 I was devasted by this, and mildly depressed in September …

  13. Measuring CKM4 Solely @ LHC t, t ’ = t, t ’ SM3 SM3 Bs , t’ Remove dependence, only left. Trick: Take Ratio of Bs→ m+m-and Dms

  14. Measuring CKM4 Solely @ LHC Anticipating 2012 t, t ’ t, t ’ “2s” SM3-like Bs , t’ Could by smaller than SM3

  15. Measurement Anticipating 2012 “2s” SM3-like Smaller than SM3 Intersect at ~ SM3 value

  16. Measurement A Third Measureable: AFB for mt’= 550 GeV Contours of ~ SM3! x x Sample points: blue; purple; red; green. Allowed

  17. Measurement for mt’= 550 GeV The refined measurements of ˙sin2FBs ˙B(Bs→ m+m-) ˙AFB(B0→ K*0m+m-) together with mt’, will pinpoint the value of Take red point to illustrate the Meaning. Sample points: blue; purple; red; green. Allowed

  18. Belle/BaBar Measurement KM Nobel b → d b → s Measurement of t, t ’ , t’ t, t ’ Determine (knowing t’ mass) ~ Triangle Relevant for BAU?

  19. but TCPV hint is now diminished … so then phase space suppressed vs CKM suppressed virtual t, b Thresholdenhanced determination of CKM4 BR(b→tW*) determines Y. Chao et al., PRD 11

  20. III. Enhancing Small Numbers nEDM4 and BAU4

  21. New neutron EDM expts underway … »for BAU« nEDM4 Borderline even if hadronic enhanced by 103 21

  22. nEDM4 estimate Pospelov & Ritz, PRD’01 Hamzaoui & Pospelov, PLB’95 effective 3-loop estimate, picking out large momenta in loop Hamzaoui & Pospelov, PRD’96 Hou & Ma, PRD’10 nEDM is a slow (safe) track for 4G nEDM4 ~10-31 e cm w/ Fanrong Xu & Junji Hisanp, to appear PRD 11

  23. BAU4estimate • Farrar & Shaposhnikov claimed, in 1993, that SM3 could generate BAU by • CP violating scattering of quasi-particles (thermal excitations of q & anti-q) • with bubbles of the • Higgs condensate • This was shot down by Gavela, Hernández, Orloff and Pène in 1994, who • pointed out FS neglected the damping length in the plasma (mainly QCD) • Huet & Sather gave in PRD’95 a lucid account, finding conservatively • We find, following the steps of HS, bubble wall Toosmall! seem sufficient! Problem: Large Yukawa coupling. w/ Masaya Kohda & Yoshio Kikukawa (prelim.)

  24. IV. Breaking the Unitarity “Bound” Yukawa-bound Ultra-heavy Mesons; pheno? Lattice future

  25. b' Search @ LHC _ b' (→ W-t)b' same sign dileptons PLB 11 LP11 Nonperturbative Partial Wave Unitarity Bound Will cross UB w/ 2011-2012 data

  26. Bethe-Salpeter approach to new Heavy Isospin Jain et al., PRD 92; 94 semi-degenerate subtract s-channel Isosinglet 1- lightest ↬Collapse for large mQ cov. + r p becomes most attractive! w w r but s-channel is repulsive ! ± ± + Ishiwata & Wise, PRD 11 relativistic correction study breaks down?

  27. Fourth generation bound states relativistic expansion study Ishiwata and Wise, PRD 11 breaks down? • My interpretation: • QCD-bound for GeV scale binding energy • Sudden turn-on of Large Yukawa Coupling • ⇒ Sudden drop in radius • jump in binding energy • Rel. Expan. fails just when it turns interesting. accidental degeneracy w8 p8 r8 less bound

  28. Bethe-Salpeter approach to new Heavy Isospin Jain et al., PRD 92; 94 semi-degenerate subtract s-channel Isosinglet 1- lightest ↬Collapse for large mQ cov. + r p becomes most attractive! w w r but s-channel is repulsive ! ± ± + Ishiwata & Wise, PRD 11 relativistic correction study breaks down?

  29. p1 : “usual” : vanish for zero rel. motion Goes down fast w/ mQ Yukawa / g5 • Tight, Relativistic Bound State (large q!) • “Negative Energy Potential” Matters! • What does collapse mean? What about s-channel subtr.? deep boundstate production/decay … Enkhbat, WSH, Yokoya, to appear PRD

  30. mQ = 500 – 700 GeV; binding -100 to -200 GeV 1 to 1.4 TeV no gg production

  31. Decay narrow

  32. Results dijet

  33. from the Abstract Enkhbat, WSH, Yokoya, to appear PRD

  34. Lattice: only known nonpert. approach talk at Lattice 2011 Last name: Lin First name: C.-J. David Affiliation: National Chiao-Tung University Email address: dlin1971@gmail.com Title: Study of the Higgs-Yukawa Theory at the Strong-Yukawa Regime Authors: John Bulava, Philipp Gerhold, George W.-S. Hou, Karl Jansen, C.-J. David Lin, Kei-Ichi Nagai, Attila Nagy, Kenji Ogawa, Brian Smigielski Type: Parallel Session: Applications beyond QCD Abstract: We present an on-going project on the Higgs-Yukawa theory in the regime of large bare Yukawa coupling. We use the overlap fermion and the pHMC algorithm in this work. Our preliminary study shows that there exists a symmetric phase (vanishing scalar vacuum expectation value) in this regime. We also comment on the investigation of the spectrum. Remote Talk tomorrow

  35. V. Conclusion • Measure CKM relevant (?) for BAU at LHC [measure also • nEDM4 safe; BAU4 “possible” • Unitarity Boundapproached with 2011-2012 LHC Data • Need Lattice Study/Understanding to Go Beyond BR(t→bW*) Ultra Relativistic, Strong/Nonpert. BoundStates !? We await the light SM Higgs verdict Transition ~ Moriond / Summer Conf. 2013

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