Neutralino Dark Matter in Light Higgs Boson Scenario

Neutralino Dark Matterin Light Higgs Boson Scenario

Masaki Asano (ICRR, University of Tokyo)

Collaborator

S. Matsumoto (Toyama Univ.)

M. Senami (Kyoto Univ.)

H. Sugiyama (SISSA)

Phys.Lett.B663:330

Introduction

What is the Light Higgs boson scenario?

Is LHS also compatible with GUT and Dark Matter?

We search the region where consistent with particle physics experiments cosmological observations.

Possibility of the dark matter direct detection in LHS.

Introduction What is Light Higgs boson Scenario (LHS)? is referred to as LHS in this

talk.MSSM with mh < 114.4 GeV

Recently, G.L.Kane, T. T. Wang, B. D. Nelson and L. T. Wang (2005), M. Drees (2005), A. Belyaev, Q. H. Cao, D. Nomura, K. Tobe, C. P. Yuan (2006), S. G. Kim, N. Maekawa, A. Matsuzaki, K. Sakurai, A. I. Sanda, and T. Yoshikawa (2006), S. G. Kim, N. Maekawa, K. I. Nagao, K. Sakurai, and T. Yoshikawa (2008) …….. Our interest

Recent works of LHS:consistency with LEP results, phenomenological aspect and a solution to the little hierarchy problem are discussed.

tan = ratio of vevs, : mixing

Higgs Boson Mass Limit from Direct Search at LEP

・ in SM, Lower limit: mh > 114 GeV (from lack of the direct signal at LEP II)

・ in MSSM, There are 2 Higgs doublets. →The coupling can be different! →The LEP limit may be lower than 114 GeV.

If sin(β - α) is small, LHS can be realized.

Introduction

tan = ratio of vevs, : mixing

Higgs Boson Mass Limit from Direct Search at LEP

・ in SM, Lower limit: mh > 114 GeV (from lack of the direct signal at LEP II)

・ in MSSM, There are 2 Higgs doublets. →The coupling can be different! →The LEP limit may be lower than 114 GeV.

If sin(β - α) is small, LHS can be realized.

Introduction

・ in MSSM, we should take care of the other mode. (This mode is suppressed due to the p-wave production as long as mA ~ mZ.)

Introduction What is Light Higgs boson Scenario (LHS)? is referred to as LHS in this

talk.MSSM with mh < 114.4 GeV

Our interest

To avoid ZAh constraint, we investigate around 90 < mh < 114 GeV .

Is LHS also compatible with GUT and Dark Matter?

We search the region where consistent with particle physics experiments cosmological observations.

Possibility of the dark matter direct detection in LHS.

Recent works of LHS:consistency with LEP results, phenomenological aspect and a solution to the little hierarchy problem are discussed.Recently, G.L.Kane, T. T. Wang, B. D. Nelson and L. T. Wang (2005), M. Drees (2005), A. Belyaev, Q. H. Cao, D. Nomura, K. Tobe, C. P. Yuan (2006), S. G. Kim, N. Maekawa, A. Matsuzaki, K. Sakurai, A. I. Sanda, and T. Yoshikawa (2006), S. G. Kim, N. Maekawa, K. I. Nagao, K. Sakurai, and T. Yoshikawa (2008) ……..

1. SM Higgs can not explain the excess, because the number of the excess events corresponds to about 10% of that predicted in the SM. 2. MSSM maybe explain this excess if the LHS is realized!

LEP has found the excess from expected BG around mh = 98 GeV.

□ 115 GeV ： 1.7σexcess

□ 98 GeV ： 2.3σexcess

Introduction

Light Higgs boson Scenario

To realize the LHS, sin(β-α) has to be small.

Assuming

Large radiative corrections

Mass eigenstates of neutral Higgs bosons are described by

small sin(β - α)

Neutral Higgs mass matrix

h (η2) H (η1)

mA2

mZ2

mA2 mZ

2

h (η1) H (η2)

Lightest Higgs consists of up-type. → cos α ~ 1 , α ~ 0 → sin(β-α) ~ 1 → gZZh ~ gZZHSM (SM Higgs limit is applied)

usual scenario (mA2 >> mZ

2)

Lightest Higgs consists of down-type. → sin α ~1 , α ~ π/2 → sin(β-α) is small → gZZh << gZZHSM (SM Higgs limit is avoided)

LHS (mA2 ~ mZ

2)

In LHS, all Higgs bosons are light. mA2 ~ mH±

2 ~ mH2 ~ mh

2

small sin(β - α)

,

h (η2) H (η1)

mA2

mZ2

mA2 mZ

2

h (η1) H (η2)

Lightest Higgs consists of up-type. → cos α ~ 1 , α ~ 0 → sin(β-α) ~ 1 → gZZh ~ gZZHSM (SM Higgs limit is applied)

usual scenario (mA2 >> mZ

2)

Lightest Higgs consists of down-type. → sin α ~1 , α ~ π/2 → sin(β-α) is small → gZZh << gZZHSM (SM Higgs limit is avoided)

LHS (mA2 ~ mZ

2)

In LHS, all Higgs bosons are light. mA2 ~ mH±

2 ~ mH2 ~ mh

2

small sin(β - α)

,

h (η2) H (η1)

mA2

mZ2

mA2 mZ

2

h (η1) H (η2)

Lightest Higgs consists of up-type. → cos α ~ 1 , α ~ 0 → sin(β-α) ~ 1 → gZZh ~ gZZHSM (SM Higgs limit is applied)

usual scenario (mA2 >> mZ

2)

Lightest Higgs consists of down-type. → sin α ~1 , α ~ π/2 → sin(β-α) is small → gZZh << gZZHSM (SM Higgs limit is avoided)

LHS (mA2 ~ mZ

2)

In LHS, all Higgs bosons are light. mA2 ~ mH±

2 ~ mH2 ~ mh

2

small sin(β - α)

,

Results (LHS Allowed region in NUHM )

(Non-Universal scalar masses for the Higgs Multiplets)

m0, mHu, mHd, m1/2, A0, sign(

m0, m1/2, A0, tan, , mA

Weak scale

Using this, we can study the MSSM Higgs sector in detail.

Charged LSP

WMAP allowed region

co-annihilation funnel

example parameter set

Charged LSP

WMAP allowed region

co-annihilation funnel

Light H± contribution should be canceled by chargino one. In particular, light H± contribution can be compensated by large A-terms. A-term

Bs→γ:

example parameter set

Charged LSP

WMAP allowed region

co-annihilation funnel

Br(Bs →μμ) (tanβ)∝ 6/(mA)4

tanβ

Bs →μ+μ-:

light H± contribution should be canceled by chargino one. In particular, light H± contribution can be compensated by large A-terms. A-term

Bs→γ:

Because mA is small, large tanβ ( 20) is excluded.

example parameter set

Charged LSP

WMAP allowed region

co-annihilation funnel

Br(Bs →μμ) (tanβ)∝ 6/(mA)4

tanβ

Bs →μ+μ-:

light H± contribution should be canceled by chargino one. In particular, light H± contribution can be compensated by large A-terms. A-term

Bs→γ:

Because mA is small, large tanβ ( 20) is excluded.

Allowed region

CONSTRAINTS Parameter Scan

80 < mA < 140 GeVtan = 10

(, A0) GeV = (300, –700), (600, –1000), (700, –1100)

WMAP LEP2 Higgs search Zh/ZH & Ah/AH SUSY particle searches Color/Charged breaking Br( b sγ ) & Br( Bs μ+μ– )

For several value of μ, we search the region which is consistent with following constraints.

CONSTRAINTS Parameter Scan

80 < mA < 140 GeVtan = 10

(, A0) GeV = (300, –700), (600, –1000), (700, –1100)

WMAP LEP2 Higgs search Zh/ZH & Ah/AH SUSY particle searches Color/Charged breaking Br( b sγ ) & Br( Bs μ+μ– )

funnel regionfunnel region

Mixing regionMixing region

coannihilation regioncoannihilation region

For several value of μ, we search the region which is consistent with following constraints.

The LHS region consistent with the WMAP observation exists!

Too Large μ is not favored (No region for μ > 800 GeV)

Direct detection Because DM often passes through the Earth, DM sometimes interacts with nucleus inside the detector.

Direct detection observes nuclear recoil as DM scatter of them.

… Now, all Higgs are light. Then, prediction for this cross section is large.

1. Small μ is not favored from direct detection experiments.2. Even for large μ, it is possible to detect the signal at on-going experiments!

Direct detection

… Now, all Higgs are light. Then, prediction for this cross section is large.

1. Small μ is not favored from direct detection experiments.2. Even for large μ, it is possible to detect the signal at on-going experiments!

Direct detection

… Now, all Higgs are light. Then, prediction for this cross section is large.

1. Small μ is not favored from direct detection experiments.2. Even for large μ, it is possible to detect the signal at on-going experiments!

Direct detection

XMASS

Summery

Light Higgs Boson Scenario is one of interesting candidates for new physics at TeV scale.

The scenario is consistent with not only particle physics experiments but also cosmological observations.

The scenario predicts a large scattering cross section between dark matter and ordinary matter, thus it will be tested at present direct detection measurements for dark matter.

We will scan all parameter space to search the lower limit of tanβ (which determines lower limit of Br(Bs μ+μ–) in LHS). Using the limit, LHS can be tested by near future.

Almost all SUSY particles are predicted to be light, these particles will be copiously produced at colliders.

Summery