slide1 n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Theoretical Implications of neutrino oscillations PowerPoint Presentation
Download Presentation
Theoretical Implications of neutrino oscillations

Loading in 2 Seconds...

play fullscreen
1 / 22

Theoretical Implications of neutrino oscillations - PowerPoint PPT Presentation


  • 77 Views
  • Uploaded on

How many light neutrinos?. Spectral pattern?. Near degeneracy, hierarchy, inverted hierarchy?. Theoretical Implications of neutrino oscillations. Crucial questions :. G. Ross, Imperial College, July 02. Why so light?. Dirac, Majorana?. Underlying origin?. Family symmetry? Unification?.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Theoretical Implications of neutrino oscillations' - grace


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.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
theoretical implications of neutrino oscillations

How many light neutrinos?

Spectral pattern?

Near degeneracy, hierarchy, inverted hierarchy?

Theoretical Implications of neutrino oscillations

Crucial questions :

G. Ross, Imperial College, July 02

Why so light?

Dirac, Majorana?

Underlying origin?

Family symmetry?

Unification?

slide3

3 :

How many light neutrinos?

… protected by symmetry

4.. :

e.g. SUSY new neutral fermions

Masses not small but can generate neutrino masses via

mixing with via R-parity violation

m=0 through chiral symmetry

Modulini

Compactification

radius

slide4

New space dimensions

Radiative mass generation

Why so light?

Symmetry breaking

{

High scale : GUT breaking

Low scale : RP violation,

See-saw

Valle et al

slide5

New space dimensions

Closed string 11D propagation

Graviton, Modulini

Open string

SM states

}

Flux spreading

Dirac mass …. Could also be Majorana mass in bulk

slide6

See-saw

Majorana mass :

c.f. GUT scale MX=3.1016GeV

Double see-saw

slide7

10

100

10-1

10-2

10-3

10-4

eV

Degenerate

Normal

Inverted

4-neutrino

Spectral pattern?

slide8

10

100

10-1

10-2

10-3

10-4

eV

Near degeneracy

To generate the degeneracy need

a family symmetry – ensures it is

stable against radiative corrections

Barbieri,

Hall,

Kane,

Strumia,

GGR

  • Large mixing angles natural
  • Cosmologically interesting abundance possible
slide9

10

100

10-1

10-2

10-3

10-4

eV

Near degeneracy

To generate the degeneracy need

a family symmetry – ensures it is

stable against radiative corrections

Pseudo Dirac

gives

suppression

slide10

See-saw :

}

9 params

18 parameters

10

100

10-1

Atmospheric

10-2

10-3

10-4

King

Altarelli, Ferugio, Masina

Smirnov

eV

SRHD

Normal hierarchy

“Bottom-up” – no complicated conspiracy between matrix

elements of MD, MM

Lavignac, Masina, Savoy

Ml diagonal

slide11

Atmospheric

10

100

10-1

10-2

10-3

10-4

eV

SRHD

Solar?

Hierarchical

DRHD

Close to bound

slide12

10

100

10-1

Atmospheric

10-2

10-3

10-4

eV

Ml diagonal

SRHD

Solar?

Degenerate

Pseudo Dirac

+ similar form for MD

Near maximal U12

slide13

Pseudo Dirac

10

100

10-1

10-2

10-3

10-4

eV

Inverted hierarchy

{

Small

Lavignac et al

See-saw :

slide14

Underlying origin?

.

Unification :

}

RH quark mixing

}

LH lepton mixing

slide15

DRHD ?

Large mixings

Underlying origin?

.

Unification :

{

SO(10)

SU(2)L,R

slide16

-12

-9

-6

-3

0

3

GeV

Mixing

DATA :

Masses

?

slide17

Mass matrix determination

Near equality – large mixing

Symmetric fit

Asymmetric fit

slide18

King, GGR,

Velasco Sevilla

slide21

νs - Near bi-maximal mixing

Majorana Mass

“See Saw” DRHD

slide22

Origin of hierarchy

…Li, X, SUSY

…New space dimensions

…See-saw

…Family symmetry

Connection between quarks and leptons?

SU(5), SO(10), strings Large mixing

Small mixing

See

saw

CP

May be probed in ν sector

SUMMARY

The new data for lepton masses and mixings (and quarks) is testing our ideas for the origin of the fermion masses and mixings and raises interesting questions :

Multiplicity of neutrinos? New symmetries