Status of SUSY Higgs Physics - PowerPoint Presentation

Slide1

Status of SUSY Higgs Physics

Monoranjan Guchait TIFR, Mumbai

EWSB &

Flavors

in the light of LHC

February 20-22,

2014

IIT

GuwahatiSlide2

My sincere apology

If I miss your work and referencesSlide3

Outline

Higgs discovery.Higgs in Supersymmetry and relatedPhenomenology.Higgs in non-minimal modelSlide4

Discovery of Higgs

Signal observed above the

background

about 4.7

σ

level

Talk by

ManasSlide5

Higgs Properties

μ

=0.80 ±0.14

̴

20% uncertainty

.

With

updgraded

LHC,

this can come down

to 8-10%

Spin 0

+

is favoredSlide6

What it is?

Hence, it is a “125 GeV Boson/new state”….

But it is a Higgs Boson

Is it “the SM Higgs Boson” or “a Higgs boson” from

some other model..or something else..

Couplings to WW, ZZ and

γγ

are as expected

in SM.

Couplings are proportional to Masses as predicted

by Higgs mechanism.Slide7

No evidence of any New Physics

…..raising many uncomfortable questionsBut….

Higgs is discoveredSlide8

Higgs and New Physics

But a very serious implications are there for BSMData is compatible with SM , but sensitivity is 15-20% can constrain BSM.

Some models are already “closed”:

Higgsless

model,

fermiophobic

, gauge phobic, fourth generation,

extreme

technicolour

..

Some models are very much constrained….

Some models are under tension, many other extension

of Higgs model, private, portal light

technicolorSlide9

Is SM can be regarded as Theory of everything?

Is the SM a complete theory? Most probably answer is NO. Many issues(Th+Exp) need to understand, Hierarchy problem.. Neutrino mass,

Origin of DM

………………

Slide10

Beyond SM

Supersymmetry and many of its variationsExtra dimension,Kaluza Klein,Composite Higgs

Little Higgs,

Littlest Higgs

………………….Slide11

Higgs and SupersymmetrySlide12

Implication in SUSY

The MSSM: particle content

+ 2 Higgs doublets

100+ parameters

Stabilization of Higgs mass,

Hierarchy problem, m(Higgs)<<M(

planck

)

Supersymmetry

is not an exact symmetrySlide13

Higgs Sector in SUSYSlide14

Higgs Masses

At tree level, lightest Higgs mass :

Higgs masses are calculable:

5

Higgsses

:Slide15

Lightest Higgs mass at 1-loop

Stop masses play an important role, connected with

the Higgs Slide16

Stop Sector

Stop mixing matrix in the basis :Slide17

Lightest Higgs masses

No(Maximal) mixing

At 1-loop correction , ̴̴ 20-25

GeV

for stop

masses < 1

TeV

and no mixing scenarioSlide18

Upper bound on lightest Higgs Mass

Very strong prediction

For M

SUSY

̴ 1

TeV

.

An upper bound of 135

GeV

of lightest

higgs

can be achieved

GeVSlide19

Higgs MassesSlide20

Implications

A Higgs of mass 125 ±2 GeV

is observed.

What are the implications

In SUSY models?

What happens to the Higgs

sector?

What are the implications of Higgs discovery in other

particle searches, in particular stop searches?Slide21

Lightest Higgs mass and stop sector

Maximal mixing is favored, otherwise, requires heavy stop

Hall et. al ,12Slide22

Lightest Higgs mass and stop sector

In

pMSSM

Large M

S

values with moderate

mixings and high tan

β

are preferred

Djouadi

et. al ‘12Slide23

Prediction for stops

For large mixing, stop masses are within the reach of LHC and if it found, then this form of MSSM may be valid.

If LHC does not find stop, need to think some other

form of SUSY models

.Slide24

Stop searches at the LHC

Stop mass ̴ 500-600 GeV excluded depending on LSP mass.Slide25

Improved calculation of Higgs mass

Codes SoftSUSy, Spheno, and SusPect calculates the Higgs mass full One loop + dominant 2 loop contributions from top/stop loops

Recent calculation taking leading Three loops using

DR or a hybrid renormalization scheme for stop

sector where is the numerical evaluation

Depends on various SUSY hierarchies.

FeynHiggs

version 2.10 full one loop + two loop

leading and

subleading

contribution +

resummation

of leading and next to leading contributions

Allanach

, et. Al.,

Porod

et. Al,

Djouadi

et. Al.

Harlander

et. Al.

Heinemeyer

et. Al Slide26

Improved calculation of Higgs Mass

Heinemeyer et. al. 1312.4937Slide27

Impact on Models

O.

Buchmuller

, et. al 1312.5233 Slide28

MA-tanβ

exclusionSlide29

MH-mod scenario

mh-max scenario was designed to get large Higgs

mass , with

sparticle

masses set to > 1

TeV

.

Now, with the present Higgs mass, relaxing

mh

-max scenario, possible to obtain desired Higgs massSlide30

Mh-mod

scenario:MA-tanβ exclusionSlide31

MSSM: Charged HiggsSlide32

Beyond MSSM

In MSSM, getting the correct Higgs mass is not so trivial. Need higher SUSY scales, fine tuning which is not very interesting from phenomenological point of view.

May be LHC data give hints to go beyond MSSM, (M+1) SSM= NMSSMSlide33

μ-problem

In MSSM:

If

μ

is generated dynamically, can be controlled.Slide34

NMSSM Model

The superpotential,

Four

n

ew parameters :

: dimensionless

: dimension full ̴ M

SUSY

Some additional terms are not considered in general MSSM,

like tadpole terms etc.Slide35

NMSSM: Higgs Potential

With:

Tree level Higgs

potantial

: Slide36

Higgs spectrum

Mass terms :

7

Higgsses

Singlet like

CP even:

CP odd:Slide37

NMSSM: μ

problemA

vev

<S> of S, of the order of the weak or SUSY breaking

scale generates

μ

-term with

It solves mu problem.

Phenomenological constrained , lighter

chargino

> 100

GeV

,Slide38

Lightest Higgs Mass

The lightest Higgs mass:, the SM like , largest coupling with the gauge boson,

Contribution due to the singlet

int

For large values of

λ

, and for small tan

β

, the second term

grows, possible to achieve larger Higgs mass at tree level.

For

λ

̴ 0.7 – 0.8, Higgs mass cannot be raised above

125

GeV

at tree level.

To recover 125

GeV

Higgs mass, we need, another

̴ 25

GeV

contribution to the tree level mass.Slide39

Higgs Mass at one loop

Loop level contribution make Higgs mass favorable valueSlide40

Lightest Higgs Mass

Ellwanger and Hugonie

, ‘06

Mt=178

GeV

Mt=171.4

GeV

MSSM

Mt=178

GeV

MSSM

Mt=171

GeVSlide41

All Higgs MassesSlide42

Lightest Higgs Mass SM like

Tree level mass

L. Hall et. al. ‘11Slide43

Higgs Mixings

Mixing of CP odd Higgs

P

2

is singlet like , If M

A

is large, mixing is small, A

1

is completely

singlet like A

2

has finite singlet component.

And for CP even Higgs,

O

ij

is a

diagnolizing

matrices and also determine

couplings., it controls Couplings.

Slide44

SUM RULESSlide45

Higgs couplings

The treel level couplings between charged Higgs and fermions/gauge bosons sams

as MSSM

Couplings A

1,2

to SM particles are same as MSSM, but

multiplied by a dilution factors, related with mixings

Coulings

for h

1

and SM particle can be read off by

replacing Cos

α

and sin

β

by the

i-th

eigen

vector of

diagonalizing

matrices.

A pure singlet SU(2) components has

valising

couplings

with fermions and gauge bosons, then it is difficult to

search those

higgs

masses at the

the

collider. Slide46

ZZH reduced couplings

Non observation of Higgs in LEP

Light CP scalars are not ruled

out by LEP, because of reduced

couplings.

For

ξ

̴ 0, the H

1

is difficult to produce, H

2

is sensitive to Higgs

searches, possibility of another

lighter Higgs to exist.Slide47

NMSSM Higgs in in B-Factory

Prasad,

Bipul

,

Poulose

, 12Slide48

NMSSM Higgs at the LHCSlide49

Higgs production at the LHC

Signal depend on the standard higgs discovery modesSlide50

NMSSM Higgs at the LHC

Higgs discovery is same as MSSM channels, but sensitivity depends on the doublet-singlet mixings.Interestingly, higgs to

higgs

decays,

h→AA

decays give rich

phenomenology.

Gunion

et. Al.,

Poulose

,

Moretti

et. al. ,

Dproy

,

Drees

, MG, ….

If lighter state , possibly below LEP limits, is SM like and

strongly mixed, less coupling with b-quarks, enhanced

decay rates In photonic channel.

G. Belanger et. al ‘12, ….

There are scenario where the SM like state is H

2

and the

lightest state is H

1

(70 – 100

GeV

), singlet like.

Distinguishing feature of NMSSMSlide51

Outlook

Discovery of 125 GeV Higgs open up new era in particle physics. Although, it is very much SM-like, possibility of other BSM are not ruled out. May be , this Higgs is the first

piece of BSM, which has been discovered.

In minimal

Supersymmetry

, it can be confirmed by discovering

sparticles

, mainly lighter Stop, and non-minimal SUSY

model, in addition more lighter states of Higgs are

required to be discovered.

A rich phenomenology and experimental program is ahead

in the next generation of LHC.

Slide52

Thank you