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2HDM George W.S. Hou (NTU) Guwahati, 2/2014 1 Two Higgs Doublet Model: Past and Future February 21, 2014, Guwahati.

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Presentation on theme: "2HDM George W.S. Hou (NTU) Guwahati, 2/2014 1 Two Higgs Doublet Model: Past and Future February 21, 2014, Guwahati."— Presentation transcript:

1 2HDM George W.S. Hou (NTU) Guwahati, 2/2014 1 Two Higgs Doublet Model: Past and Future February 21, 2014, EWSB-Flavours-LHC @ Guwahati

2 2HDM George W.S. Hou (NTU) Guwahati, 2/2014 2 Intro: Flav H ➾ EWSB Soni; H + ; Enhanced “Murky”; Top-Higgs Let’s Do H + : b → s  ( g ) “Murky Mode” @ 10%: b → c  & b → sg ➥ B → D ( * )  ;  FCNH: Model III & t → ch  LHC Conclusion 2HDM: Past & Future EWSB-Flavour-LHC ➾ More on “Lost Opportunities” (from my past dabbles) and Good Pheno Link

3 2HDM George W.S. Hou (NTU) Guwahati, 2/2014 3 m m F ~ F υ m m V ~ g υ B.E.H., 1964 Weinberg, 1967 Flavour Sector V L “ seen ” since 1983 The “God” Particle: the Origin of Mass Fermion: Repeated Doublets (Agent of) EWSB Higgs: Second Doublet

4 2HDM George W.S. Hou (NTU) Guwahati, 2/2014 4 2HDM Will focus on Flavour Connection p.s. parameters in Higgs sector always give me the shudders …

5 2HDM George W.S. Hou (NTU) Guwahati, 2/2014 5 Thanks, Soni ! WSH, Soni, Steger,b → s  PLB’87 WSH, Soni, Steger,b → sg*PRL’87 WSH, Soni, B d & B s MixingPLB’87 WSH, Willey, Soni,b → s ℓ  ℓ  PRL’87 4G Introduced me to B Physics. But I missed “large QCD corrections” by focusing too much on New Physcs… Bertolini, Borzumati, Masiero, PRL’87 Deshpande, Trampetic, Eilam, Singer, PRL’87 ➥ Operator Analysis: Culmination in M. Misiak!

6 2HDM George W.S. Hou (NTU) Guwahati, 2/2014 6 Thanks, Soni ! WSH, Soni, Steger,b → s  PLB’87 WSH, Soni, Steger,b → sg*PRL’87 WSH, Soni, B d & B s MixingPLB’87 WSH, Willey, Soni,b → s ℓ  ℓ  PRL’87 4G Introduced me to B Physics. Timelike Lightlike Spacelike

7 2HDM George W.S. Hou (NTU) Guwahati, 2/2014 7 Before summer 1987, before moving from Pitt to Munich, saw this paper... and said to Ray Willey, “We can easily do this, too.” Turned out they focus on large tan  … and missed a crucial sign. H + effect b → s 

8 2HDM George W.S. Hou (NTU) Guwahati, 2/2014 8 Usual 2HDM Framework: NFC

9 2HDM George W.S. Hou (NTU) Guwahati, 2/2014 9 H + Couplings in Model I/II “SUSY” (mindset: ~ m t /m b )

10 2HDM George W.S. Hou (NTU) Guwahati, 2/2014 10 1992: CDF bound of mt > 91 GeV Could top be still lighter? Ca. 1990: B s.l. (semileptonic BR) and N C (charm counting) problem. Could there be Enhanced “Murky” Modes? ➥ Polish synergy: B → D ( * )  ; B →  t → ch  Non-NFC: Model III

11 2HDM George W.S. Hou (NTU) Guwahati, 2/2014 11 Intro: Flav H ➾ EWSB Soni; H + ; Enhanced “Murky”; Top-Higgs Let’s Do H + : b → s  ( g ) “Murky Mode” @ 10%: b → c  & b → sg ➥ B → D ( * )  ;  FCNH: Model III & t → ch  LHC Conclusion 2HDM: Past & Future EWSB-Flavour-LHC ➾ More on “Lost Opportunities” (from my past dabbles) and Good Pheno Link

12 2HDM George W.S. Hou (NTU) Guwahati, 2/2014 12 Let’s Do H + : b → s  ( g )

13 2HDM George W.S. Hou (NTU) Guwahati, 2/2014 13 logarithmic vs power GIM suppression in SM QCD corr. brings in large log b → s  ( g )

14 2HDM George W.S. Hou (NTU) Guwahati, 2/2014 14 ξ 2 = cot 2 , ξξ′  = ξ 2 (Model I),  (Model II) fig. stolen from Hermann, Misiak, Stenihauser why does ξ′ enter?

15 2HDM George W.S. Hou (NTU) Guwahati, 2/2014 15 ξ 2 = cot 2 , ξξ′  = ξ 2 (Model I),  (Model II) fig. stolen from Hermann, Misiak, Stenihauser why does ξ′ enter?

16 2HDM George W.S. Hou (NTU) Guwahati, 2/2014 16 ξ 2 = cot 2 , ξξ′  = ξ 2 (Model I),  (Model II) fig. stolen from Hermann, Misiak, Stenihauser, JHEP’12 NNLO

17 2HDM George W.S. Hou (NTU) Guwahati, 2/2014 17 Hermann, Misiak, Stenihauser, JHEP’12 [1208.2788] Exp 1  SM 1  WSH & Willey NPB’89 State of the Art Can be weakened by BSM

18 2HDM George W.S. Hou (NTU) Guwahati, 2/2014 18 “Murky Mode” @ 10%: b → c  & b → sg ➥ B → D ( * )  ;  

19 2HDM George W.S. Hou (NTU) Guwahati, 2/2014 19 The Polish Connection/Synergy b → c  part based on Krawczyk and Pokorski, PRL’88 SM ~ 3% ~ 0.2%

20 2HDM George W.S. Hou (NTU) Guwahati, 2/2014 20 charm counting ~ SM charm counting Sol. 1: b → sg @ 10% Great Pheno If True ! ca. 1991 Sol. 2: b → c  @ 10%

21 2HDM George W.S. Hou (NTU) Guwahati, 2/2014 21 PLB’92 Form Factors scalar tr. long. scalar ➥  polarization Flip Kalinowski, PLB’90 s-wave enhanced 7 5 3

22 2HDM George W.S. Hou (NTU) Guwahati, 2/2014 22 ALEPH Exclusion of b → c  @ 10%; and then … b →  + X = (4.08 ± 0.76 ± 0.62)%PLB’93 (2.75 ± 0.30 ± 0.37)%PLB’95 (2.43 ± 0.20 ± 0.25)%EPJC’01 ➙ SM-like, rule out enhanced b → c  = (1.05 ± 18)% = (1.64 ± 15)% saturate inclusive (PDG’13) expected a crisp result: no new hadronic effect beyond f B within SM cf.

23 2HDM George W.S. Hou (NTU) Guwahati, 2/2014 23 Crisp B →  Surprise

24 2HDM George W.S. Hou (NTU) Guwahati, 2/2014 24 anybody out there? cottage industry When First Evidence in 2006, citations soared. A Driver for Super B Factory

25 Theory Summary George W.S. Hou (NTU) FPCP@USTC, Hefei 5/25/2012 25 Finally underway in my own group … Old Tensions: e.g. Or, But, B →  almost touched by BaBar/Belle. Super B Factory (2015 for Belle 2) would unravel it “immediately”. Totally different systematics! An Illustration towards 2015+ Which One ? No serious sign of Godot in FPCP... Roderjohann; Soni Lüth Hara Stole from my own FPCP2012 Talk

26 2HDM George W.S. Hou (NTU) Guwahati, 2/2014 26 FCNH: Model III & t → ch  Became relevant recently at the LHC 11/1991

27 2HDM George W.S. Hou (NTU) Guwahati, 2/2014 27 2HDM Framework: NFC 2HDM III: “Natural” FC Neutral Higgs FCNH from B Phys.

28 2HDM George W.S. Hou (NTU) Guwahati, 2/2014 28 FCNH: t → ch  & Model III Thy Shall Not Mix 4G – 2HDM – FCNH ! “    ”

29 2HDM George W.S. Hou (NTU) Guwahati, 2/2014 29 t → ch  / t → bW* h  → tc / h  → bb & tt S/P 1% benchmark FCNH: t → ch  & Model III

30 t → ch @ LHC George W.S. Hou (NTU) EPSHEP@Stockholm 19/7/2013 30 Pro-found if Found BaBar Anomaly, 2HDM-III & tch 0 Coupling B Physics & H →  Constraints t → ch 0 Search at LHC Kao, Cheng, WSH, Sayre, PLB 2012 Chen, WSH, Kao, Kohda, 1304.8037 Mass FCNH: verboten in SM & 2HDM I/II Glashow-Weinberg 1977 Fajfer, Kamenik, Nisandzic, Zupan, PRL 2012 Crivellin, Greub, Kokulu, PRD 2012; 1303.5877 CGK KCHSCHKK C.Kao talk ZZ* gg WW* bb t c h0h0 ► ► Outline

31 t → ch @ LHC George W.S. Hou (NTU) EPSHEP@Stockholm 19/7/2013 31 Very (too) Large ! BaBar, PRL 2012 BaBar “ Anomaly ”

32 t → ch @ LHC George W.S. Hou (NTU) EPSHEP@Stockholm 19/7/2013 32 2HDM-III (General) Yukawa Interactions [we use notation of Mahmoudi and Stal, PRD 2010 Exotic “ Standard ” CGK considered Decoupling Limit: SMH FCNH To consider t → ch 0 : FCNH Need Nondecoupling: h  mixes in cos (  ) frac. of H  Not only  bb, but   turn out small (next page)  deviate from CGK [left with m H + pockets  ct ~ 1, implying  tt and  cc need be considered! Crivellin, Greub, Kokulu, PRD 2012 2 32 32 32 3

33 t → ch @ LHC George W.S. Hou (NTU) EPSHEP@Stockholm 19/7/2013 33 t → ch 0 How large can B ( t → ch 0 ) be?  ct ~ 1 cos (  ) If  ct ~ 1, what constraint we have on cos (  ) ? N.B. From  tt(bar) measurement with dileptons, one t → ch infers B ( t → ch ) cannot be larger than few %. With Regrets, “ detach ” from BaBar anomaly m H + pockets remain B & H →  Constraints t → ch 0 t → ch 0 Search at LHC

34 t → ch @ LHC George W.S. Hou (NTU) EPSHEP@Stockholm 19/7/2013 34 Summary of Constained 2HDM-III  cc  tt  ct New Sector to be probed at the LHC

35 t → ch @ LHC George W.S. Hou (NTU) EPSHEP@Stockholm 19/7/2013 35 No Evidence of Excess Jets in ZZ* … Any tt(bar ) → ch bW ? KCHS’12: Can probe down to 1% Craig et al., PRD 2012: < 2.7% (can improve) Simple CLs estimate gives (95% C.L.) t → ch B (t → ch) < 1.5% Best done directly by the Experiments ATLAS 4 ℓ + 4j evt (backup) Illustration ? 2.2% Is there bias even in ZZ*?

36 t → ch @ LHC George W.S. Hou (NTU) EPSHEP@Stockholm 19/7/2013 36 ∙  + 4j,  + jj + l : [  in Higgs window ] Because of background concerns, evts perhaps rejected by  ( VBF )  Even the study of such BG may be interesting; b/t tags if found. ∙ WW* + jets, WW* + jets + W : [ no Higgs Mass ] Comments ATLAS announced at Higgs Hunting, Orsay, week after EPS: t → cH  < 0.83% at 95 C.L. ATLAS-CONF-2013-081 CMS announced at SUSY2013: t → ch mult- ℓ < 1.28% at 95 C.L. CMS PAS-SUS-13-002 Can be Improved Astounding: % level bound year after Higgs discovery !

37 2HDM George W.S. Hou (NTU) Guwahati, 2/2014 37 2HDM H + Search at LHC Eli Ben-Haim @ EPSHEP2013 a BaBar-centric View LHC Search has Started !

38 2HDM George W.S. Hou (NTU) Guwahati, 2/2014 38 ATLAS JHEP’12 CMS JHEP’12 t → bH + Search at LHC

39 2HDM George W.S. Hou (NTU) Guwahati, 2/2014 39 t → bH + & H + → tb at LHC ATLAS-CONF-2013-081 t → bH + : getting there entered H + → tb

40 2HDM George W.S. Hou (NTU) Guwahati, 2/2014 40 finally getting there

41 2HDM George W.S. Hou (NTU) Guwahati, 2/2014 41 Conclusion: 2HDM I, II & III b → s  B →  Haisch 0805.2141 BaBar throws in B → D ( * )  monkey wrench ➥ Rule out 2HDM II ? finally getting there finally getting there FCNH t → ch  Search Underway need Belle-II (2015+) 2015+ Looks Bright

42 2HDM George W.S. Hou (NTU) Guwahati, 2/2014 42

43 2HDM George W.S. Hou (NTU) Guwahati, 2/2014 43 Outline Is “ the Higgs ” the Agent of BEH Mech.? 12/2013 EWSB Dilaton Dilaton : Goldstone boson of SSB of Scale Invariance

44 2HDM George W.S. Hou (NTU) Guwahati, 2/2014 44 υ /Fυ /F

45 2HDM George W.S. Hou (NTU) Guwahati, 2/2014 45 Leading Processes cgcg Dilaton How does Dilaton fake Higgs ? H → ZZ* → ee  H →  Dilaton Dilaton cgcg υ /Fυ /F cccc but, no convincing evidence for VBF ( Vector Boson Fusion ) or VH (Higgsstrahlung off V ) so far ➙ Dilaton ➙ Check Dilaton 2015+ ! c g υ /F ~ SM Higgs c g c  ~ SM Higgs fortuitous, maybe …

46 2HDM George W.S. Hou (NTU) Guwahati, 2/2014 46 B →  Satus

47 t → ch @ LHC George W.S. Hou (NTU) EPSHEP@Stockholm 19/7/2013 47 Nonperturb.  ct needed With Regrets, “ detach ” from BaBar anomaly b → s  :  bb tinyHiggs →  :   small Because of chiral m t /m b and KM enhancement,  bb tiny ! ~ SM m H + pockets remain Data-constrained 2HDM-III

48 t → ch @ LHC George W.S. Hou (NTU) EPSHEP@Stockholm 19/7/2013 48 Example: Clean Sample of ZZ* → 4 ℓ (  ) With 126 GeV dominantly SMH, i.e. sin(  ) ≃ 1 (near Decoupling), ZZ* (and WW*) Rate hard to change.  cc The width of 126 GeV Higgs can be enhanced by  cc as not measured.  tt cos (  ). Gluon Fusion can be enhanced by  tt, even though damped by cos (  ). Consistency of 15-20 evts ~ SM w/ little BG, for both CMS/ATLAS t → ch Cf.:  tt(bar) ~ 220 pb, if t → ch 2%, then tt(bar) → chbW is at 9 pb ! ~ 22 pb Could we have seen it already !?

49 t → ch @ LHC George W.S. Hou (NTU) EPSHEP@Stockholm 19/7/2013 49 ! One ATLAS ee  + 4j Event ! ATLAS-CONF-2013-013, (extra) Fig. 38 [ thanks to Bill Murray “Passed VBF Selection” Is there bias even in ZZ*?   is there a b?


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