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Outlook: Higgs, SUSY, flavor

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Outlook: Higgs, SUSY, flavor Ken-ichi Hikasa (Tohoku U.) Fourth Workshop, Origin of Mass and SUSY March 8, 2006, Epochal Tsukuba – PowerPoint PPT presentation

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Title: Outlook: Higgs, SUSY, flavor


1
Outlook Higgs, SUSY, flavor
  • Ken-ichi Hikasa (Tohoku U.)

Fourth Workshop, Origin of Mass and SUSY March 8,
2006, Epochal Tsukuba
2
Apology
  • This is not designed to be a summary talk, so no
    reference to most of the talks

3
Standard Model
4
SM GHY
  • Three elements
  • G gauge
  • H Higgs
  • Y Yukawa

5
SM GHY
  • Three elements
  • G gauge Dm
  • H Higgs
  • Y Yukawa
  • All gauge interactions from Dm ?m ig Am
  • ? Universality unique coupling,
  • blindness to
    generations

6
SM GHY
  • Three elements
  • G gauge
  • H Higgs l j4
  • Y Yukawa
  • Symmetry breaking, W,Z masses
  • Higgs mass term m2 only dimensional parameter in
    SM (classically)
  • ? sets the weak scale

7
SM GHY
  • Three elements
  • G gauge
  • H Higgs
  • Y Yukawa y f f j
  • Fermion couplings to Higgs field
  • give masses to quarks/leptons

8
SM GHY
  • Three elements
  • G gauge Dm
  • H Higgs
  • Y Yukawa
  • Only interaction experimentally confirmed
  • 2/3 of SM still to be tested

9
SM GHY
  • Three elements
  • G gauge
  • H Higgs
  • Y Yukawa yij fi fj j
  • No universality origin of flavor difference
    and mixing
  • Most of parameters in SM

10
Generation mixing
If no Yukawa coupling, generation labels has no
meaning
11
Generation mixing
Charged current interactions connects ups and
downs
W
12
Generation mixing
Yukawa couplings breaks the generation symmetry
13
Generation mixing
Mismatch of ups and downs gives the Cabibbo mixing
u2
c
u1
u
d2
W
s
d1
?C
d
14
Leptons
If the neutrinos were massless
n 2
n1
? 2
m
?1
e
15
Leptons
Neutrino eigenstates can be defined only by
charged current and the lepton flavors are
conserved
n2
nm
n1
ne
? 2
m
?1
e
16
Neutrino mass (side remark)
  • In SM, n is made to be massless
  • Quark-lepton correspondence
  • Naturally expect nR Yukawa
  • nR gauge blind particle (hard to see)
  • Ultratiny mass suggests different origin
  • Important question Dirac or Majorana?

17
Higgs sector
18
DIweak ½ Rule
  • Quark/lepton masses have to be DIweak ½
  • W, Z masses can have any DIweak
  • Precision measurements experimental evidence for
    DIweak ½ dominance

19
DIweak ½ Rule
r1 to high precision ? doublet vev dominance
20
Indirect Higgs limit
21
Direct Higgs searches
  • Still a long way to go, but worth pursueing

22
MSSM implies light Higgs
23
MSSM/two doublet
  • Large tan b region started to be excluded at
    Tevatron

A0? tt-
24
Beyond SM
  • Standard Model is not the final story

25
(Observational) reasons we need FBSM
  • Gravity
  • Dark Matter
  • Dark Energy
  • Baryon asymmetry
  • CMB
  • Neutrino mass

26
(Theoretical) reasons we need FBSM
  • No strong CP violation
  • Hierarchy problem?
  • Too many parameters?
  • Unification of gravity

27
Where to seek for FBSM
  • New particles
  • Energy frontier
  • Faint interactions (can be light)
  • Forbidden processes
  • baryon violation
  • lepton violation
  • lepton flavor violation
  • (seen in n oscillations, but very
    small)
  • Suppressed processes

28
Weak interaction processes
  • Superallowed
  • t ? b, c ? s
  • CKM suppressed (tree-allowed but small)
  • b ? c, u s ? u
  • GIM suppressed (tree-forbidden)
  • FCNC b ? s, d s ? d
  • Good place to look for new physics

29
FBSM Scenarios
30
Supersymmetry
  • Raison dêtre aka excuse
  • Unique nontrivial extension of the Poincaré
    group ( Einsteins relativity)
  • Motivation _at_ weak scale
  • Stabilize Fermi-Planck hierarchy by cancelling
    loop corrections

31
Extra Dimensions
  • Raison dêtre aka excuse
  • Superstrings require 10 spacetime dimensions for
    consistency
  • Motivation _at_ weak scale
  • (Originally) trading the Fermi-Planck hierarchy
    for large extra-dim size
  • More recently, branes, Randall-Sundrum
    hierarchy,

32
Extra Dimensions
  • All SM interactions are nonrenormalizable for Dgt5
  • ? Couplings tend to blow up above weak scale
  • Strong-coupling phenomena at TeV
  • (Technicolor-type physics)
  • Higgsless models Heavy W,Z recurrences should
    appear

33
And many others
34
Minimal Supersymmetric Standard Model
35
MSSM
  • Many parameters (gt100)
  • New sources of flavor structure
  • Sfermion masses (left and right)
  • LR mixing (A term)
  • New sources of CP violation
  • LSP neutralino good DM candidate

36
D-squark mass matrix
One new source of flavor mixing
37
D-squark mass matrix
Chiral substructure of sfermion mass
38
Vast parameter space
  • Most regions contradict with neutral Kaon mixing
  • mSUGRA, CMSSM tiny regions in the parameter
    space
  • Useful as a guideline
  • Should not trust too much

39
Varied phenomenology
  • Different mass patterns
  • Generally colored gt noncolored
  • Split SUSY scalars gt gauginos
  • Focus point light higgsinos
  • Interesting alternatives
  • Gauge mediation stau LSP
  • Anomaly mediation light wino
  • R parity violation exotic resonances

40
Dark Matter
41
Rare b decays
  • In SM, b ? s is much more suppressed than b ? c
  • ? good place for new physics
  • b-s sfermion mixing can contribute to CP asymmetry

42
New physics effects on b ? s
43
Sign of SUSY contributions
  • Extra contribution to sL
  • ? Same sign deviation for B ? fK and hK
  • New mixing of sR
  • ? Opposite sign deviation for B ? fK and hK

44
Consequence of possible deviation
  • If both fK and hK deviates in the same
    direction, new physics are in the left-handed
    sector
  • (the data are old)

Endo, Mishima, Yamaguchi
45
Lepton-flavor violation
  • Neutrino mass mixing way too small effect on
    charged lepton FV
  • Supersymmetry slepton mass matrix gives new LFV
    source
  • GUT quark mixing ? lepton mixing
  • Right-handed n ? new mixing source
  • Observable effect expected in
  • t ? mg, m ? eg etc.

46
Conclusions
47
Conclusions
  • Tevatron has plunged into new luminosity frontier
  • SM Higgs important target to pursue
  • MSSM/Two doublet already started to constrain
    parameter space
  • Supersymmetry, XD, etc
  • Dont wait for LHC

48
Conclusions (contd)
  • B factories
  • Very rich physics output
  • Good measurements of all 3 angles
  • Hint of new physics??
  • t LFV unique place to seek for FBSM
  • Kaon physics
  • should not be discontinued

49
Future
LHC, ILC
K physics
B physics
50
One final remark
  • Mass-origin priority-area grant ends in one
    month,
  • but
  • We are still on the way!
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