Outlook Post-Higgs. Fermilab. UCLA Higgs Workshop March 22, 2013

Transcription

1 Outlook Post-Higgs Christopher T. Hill Fermilab UCLA Higgs Workshop March 22, 2013

2 A dynamical Higgs mechanism was supposed to explain the origin of electroweak mass

3 A dynamical Higgs mechanism was supposed to explain the origin of electroweak mass We now know that, evidently, a fundamental Higgs Boson exists and explains the masses of quarks, leptons, W and Z

4 A dynamical Higgs mechanism was supposed to explain the origin of electroweak mass We now know that, evidently, a fundamental Higgs Boson exists and explains the masses of quarks, leptons, W and Z The Higgs Boson does NOT explain the origin of the electroweak mass-scale

5 A dynamical Higgs mechanism was supposed to explain the origin of electroweak mass We now know that, evidently, a fundamental Higgs Boson exists and explains the masses of quarks, leptons, W and Z The Higgs Boson does NOT explain the origin of the electroweak mass-scale i.e., what is the origin of the Higgs Boson mass itself?

6 A dynamical Higgs mechanism was supposed to explain the origin of electroweak mass We now know that, evidently, a fundamental Higgs Boson exists and explains the masses of quarks, leptons, W and Z The Higgs Boson does NOT explain the origin of the electroweak mass-scale i.e., what is the origin of the Higgs Boson mass itself? This may present opportunities for a deeper understanding

7 QCD beautifully explains the origin of strong mass:

8 The magnificent scale anomaly: The scale current: = 0 in a scale invariant theory

9 The magnificent scale anomaly: The scale current: = 0 in a scale invariant theory The old puzzle: QCD is scale invariant!!!???!???

10 Resolution: The Scale Anomaly

11 Resolution: The Scale Anomaly Origin of Mass in QCD = Quantum Mechanics

12 QCD beautifully explains the origin of strong mass: Gell-Mann and Low: Gross, Politzer and Wilczek:

13 Many theories were proposed to imitate QCD for the electroweak scale (1) Technicolor (2) Supersymmetric Technicolor (3) Extended Technicolor (4) Multiscale Technicolor (5) Walking Extended Technicolor (6) Topcolor Assisted Technicolor (7) Top Seesaw (8) Supersymmetric Walking Extended Technicolor (9) Strong dynamics from extra-dimensions (10).

14 Many theories were proposed to imitate QCD for the electroweak scale (1) Technicolor (2) Supersymmetric Technicolor (3) Extended Technicolor (4) Multiscale Technicolor (5) Walking Extended Technicolor (6) Topcolor Assisted Technicolor (7) Top Seesaw (8) Supersymmetric Walking Extended Technicolor (9) Strong dynamics from extra-dimensions (10). Most of these models were killed on July 4 th 2012

15 Susy is still alive?

16 Susy is still alive? We discovered a Standard Model Higgs and Susy is still alive?

17 Why EDM s are so powerful: e m e Λ 2 _ Ψ γ 5 σ µν F µν Ψ e m e d e = Λ 2 (m e /MeV) = 0.2 x (e-cm) x (Λ /GeV) 2 Current limit: d e < e-cm Λ > 1.4 x 10 5 GeV

18 Why EDM s are so powerful: selectron e wino wino e e m e Λ 2 _ Ψ γ 5 σ µν F µν Ψ 1/(Λ) 2 = (α sin(γ) / 4π sin 2 θ) /(M selectron ) 2 M selectron > 7 TeV ( sin(γ)) 1/2 Future limit: d e < e-cm e-cm?

19 Susy is still alive? Weak Scale SUSY was seriously wounded before the LHC turned on (e.g. EDM s)

20 Susy is still alive? Weak Scale SUSY was seriously wounded before the LHC turned on (e.g. EDM s) Natural Weak Scale SUSY e.g. MSSM, was killed by LHC with new, severe direct limits

21 A very heretical conjecture:

22 Predictions of the Conjecture: We live in D=4! Cosmological constant is zero in classical limit QCD scale is generated in this way; Hierarchy is naturally generated Testable in the Weak Interactions? Weyl Gravity in D=4 is QCD-like: Is the Higgs technically natural? On naturalness in the standard model. William A. Bardeen (Fermilab). FERMILAB-CONF T, Aug pp. Conjecture on the physical implications of the scale anomaly. Christopher T. Hill (Fermilab). hep-th/

23 Mass is always associated with conformal symmetry breaking

24 QCD: Explicitly Broken Scale symmetry by perturbative anomaly The Origin of the Nucleon Mass (aka, the visible mass in the universe)

25 Spontaneously Broken Scale Symmetry? Nambu-Goldstone Boson Dilaton

26 Spontaneously Broken Scale Symmetry? Nambu-Goldstone Boson Is the Higgs boson a Dilaton?

27 Higgs Potential M 2 φ 2 + _ λ φ 4 2

28 Scale Invariant Higgs Potential M 2 φ 2 + _ λ φ 4 2

29 Scale Invariant Higgs Potential M 2 φ 2 + _ λ φ 4 2

30 v Higgs Potential M 2 φ 2 + _ λ φ 4 2 v = M / λ 1/2

31 δh Scale Invariant Higgs Potential 0 x φ 4

32 δh Scale Invariant Higgs Potential 0 x φ 4

33 δh Scale Invariant Higgs Potential 0 x φ 4 dilatonic current

34 This permits mass with hidden scale symmetry

35 This permits mass with hidden scale symmetry

36 This permits mass with hidden scale symmetry

37 This permits mass with hidden scale symmetry

38 Remarks on Higgs Boson Interactions with Nucleons. Mikhail A. Shifman, A.I. Vainshtein, Valentin I. Zakharov (Moscow, ITEP) Phys.Lett. B78 (1978) 443 Low Energy Theorems for Higgs Boson Couplings to Photons. Mikhail A. Shifman, A.I. Vainshtein, M.B. Voloshin, Valentin I. Zakharov (Moscow, ITEP) Sov.J.Nucl.Phys. 30 (1979) , Yad.Fiz. 30 (1979)

39 The Higgs is massive, so it would be a pseudo dilaton at mass-shell

40 The Higgs is massive, so it would be a pseudo dilaton at mass-shell Scale symmetry is broken by quantum loops, (ie by renormalization group running)

41 The Higgs is massive, so it would be a pseudo dilaton at mass-shell Scale symmetry is broken by quantum loops, (ie by renormalization group running) Higgs quartic coupling λ runs to zero, but

42 The Higgs is massive, so it would be a pseudo dilaton at mass-shell Scale symmetry is broken by quantum loops, (ie by renormalization group running) Higgs quartic coupling λ runs to zero, but. then negative at M GUT = to (very sensitive to m top )

43 The Higgs is massive, so it would be a pseudo dilaton at mass-shell Scale symmetry is broken by quantum loops, (ie by renormalization group running) Higgs quartic coupling λ runs to zero, but. then negative at M GUT = to (very sensitive to m top ) Standard Model Vacuum is Unstable!

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47 The SM Higgs is Dilatonic at the λ = 0 scale M GUT = to GeV Higgs is pseudo-dilatonic at the m Higgs scale due to the λ running (scale anomaly) Dilatonic Higgs seems to imply a vacuum instability

48 Is there any hope left for dynamics?

49 Is there any hope left for dynamics? Coincidence?

50 Is there any hope left for dynamics? Coincidence?

51 I find this intriguing: Generalize dilatational c-number shift

52 Generalize dilatational c-number shift to a q-number shift: nonlinear super -symmetry: Super Dilatation Symmetry of the Top-Higgs System C. T. H. E-Print: arxiv:

53 Generalize dilatational shift to a nonlinear super -symmetry: is invariant under the following SUSY dilatation:

54 A minimal super dilatation: shift only t R Full Lagrangian of Top-Higgs System Invariance under SD:

55 A UV Completion Theory invariant under super-dilatation predicts Higgs boson recurrence(s) and heavy Dirac fermion(s) Mass scale Few TeV Recurrences of Higgs and, composite fermionic models

56 Otherwise:

57 Otherwise: The Desert

58 A Muon Collider Higgs Factory provides a Staged Pathway from the Intensity Frontier to the Energy frontier via a Unique Higgs Factory Only a Low energy Muon Collider can directly measure full width of H(125) Offers most precise measurement of Higgs mass Offers most precise measurement of non-third generation Higgs-Yukawa coupling constant; can check running of cc. s peak x10 31 x(1 SMyr) = 10k Higgs Multi-Higgs H 0 A 0 accessible with 500 GeV cms machine Sensitivity begins at L = (few) x10 29

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