1 / 35

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:

sharla
Download Presentation

the Fourth Generation

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related