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A Light SM-like Higgs Boson with Exotic Decays in New Physics Models. Jin Min Yang 杨 金 民. Institute of Theoretical Physics, Academia Sinica, Beijing. 中国科学院 理论物理研究所. 2009.10.24 国立成功大学. 2HDM: L2HDM. arXiv: 0909.5148 , in PRD(R) , Cao, Wan, Wu, Yang  .

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slide1

A Light SM-like Higgs Boson with Exotic Decays in New Physics Models

Jin Min Yang

杨 金 民

Institute of Theoretical Physics, Academia Sinica, Beijing

中国科学院 理论物理研究所

2009.10.24 国立成功大学

slide2

2HDM: L2HDM

arXiv: 0909.5148 , in PRD(R) , Cao, Wan, Wu, Yang  

  • SUSY: NMSSM, nMSSM, General Singlet Ext

SUSY

arXiv: 0611142 , in PRD , Dermisek, Gunion  

arXiv: 0810.0989 , in PRD , Cao, Yang  

Higgs

Little Higgs

arXiv: 0901.1437, in PRD(R), Cao, Logan, Yang 

2HDM

arXiv: 0908.0486, in JHEP,  Wang, Xiong, Yang, Yu

  • Little Higgs: SLH, LHT

arXiv: 0611294 , in PRD , Cheung, Song  

arXiv: 0812.4609, in PRD, Wang, Yang 

slide3

Outline

0 Preface

1 2HDM: L2HDM

2 SUSY: NMSSM, nMSSM, ….

3 Little Higgs Theory: LHT, SLH

4 Conclusion

slide4

Preface

New Physics ?

Higgs

Boson

Hidden

Sector

Dark

Matter

slide5

MSSM+S

NMSSM

2HDM

New

Physics

LHT

nMSSM

SLH

slide6

1. 2HDM: L2HDM (lepton-specific 2HDM )

only couple to leptons

only couple to quarks

slide7

tan  large

 small

h, H, A, H

leptonic-Higgs dominant

SM-like Higgs ( dominant)

slide8

Constraints

  • Perturbativity
  • Unitarity
  • Potential is finite at large field values and contains no flat directions
  • LEP bound on charged Higgs mass
  • LEP constraints on neutral Higgs:

)

(

(

)

(

)

( S = scalor; f = b, )

  • W-boson mass
  • Z + + coupling
  •  leptonic decay e e 
  • muon g-2
slide9

h can be light

A can be very light

arXiv: 0909.5148 , Cao, Wan, Wu, Yang  

slide10

h A A  4  can be dominant

arXiv: 0909.5148 , Cao, Wan, Wu, Yang  

slide11

2 SUSY: NMSSM, nMSSM, ….

MSSM

NMSSM, nMSSM

-problem

little hierarchy

General MSSM+S

slide12

NMSSM, nMSSM, General MSSM+S

motivated from top-down view ?

E6 models (superstring-inspired)

string scale

SO(10)  U(1)  …

at low energy: S, Hu,Hd+ heavy particles

slide13

NMSSM Superpotential:

U(1)B: Q(1/3), U(-1/3), D(-1/3), L(0), E(0), Hu(0), Hd(0), S(0)

U(1)L: Q(0), U(0), D(0), L(1), E(-1), Hu(0), Hd(0), S(0)

U(1)R: Q(1), U(1), D(1), L(1), E(1), Hu(1), Hd(1), S(1), W(3)

0

U(1)PQ: Q(-1), U(0), D(0), L(-1), E(0), Hu(1), Hd(1), S(-2)

Scalor Potential:

U(1)R Z3 (non-R)

U(1)R ( A0, A0 ):PGB

slide14

nMSSM Superpotential:

U(1)B: Q(1/3), U(-1/3), D(-1/3), L(0), E(0), Hu(0), Hd(0), S(0)

U(1)L: Q(0), U(0), D(0), L(1), E(-1), Hu(0), Hd(0), S(0)

U(1)R: Q(1), U(1), D(1), L(1), E(1), Hu(0), Hd(0), S(2), W(2)

 0

U(1)PQ: Q(-1), U(0), D(0), L(-1), E(0), Hu(1), Hd(1), S(-2)

U(1)R Z2 matter parity

slide15

Spectrum of NMSSM, nMSSM, MSSM+S:

One more CP-odd Higgs (A1or a)

+

MSSM

One more CP-even Higgs

One more neutralino

slide16

Constraints:

(1) Direct Bounds: LEP1, LEP2, Tevatron

V

(2) Stability of Higgs Potential

(3) Cosmic Dark Matter (WMAP)

(4) Precision Electroweak Data

1 ,2 ,3 (S, T, U)

  • Rb

SUSY

(6)  g-2

slide17

NMSSM

Higgs h can be light

dark matter bound

arXiv: 0810.0989 , Cao, Yang  

slide18

NMSSM

h a a  4  can be dominant

arXiv: 0611142 , Dermisek, Gunion  

slide19

nMSSM

dark matter can be very light

h decay to dark matter

arXiv: 0901.1437, Cao, Logan, Yang 

slide20

General MSSM+S:

--Pamela+Relic density via Sommerfeld Enhance

MSSM

NMSSM

nMSSM

DM relic density

but not PAMELA

  • LSP annihlate to gauge bosons or fermion
  • LSP mass in a narrow range
  • No light particles to give Sommerfeld enhance
slide21

General MSSM+S:

Final states

  • h ~ GeV, a < 0.5 GeV

singlet-like

Sommerfeld enhancement

slide22

h ~ GeV , a < 0.5 GeV

arXiv: 0908.0486, Wang, Xiong, Yang, Yu

slide23

Sommerfeld enhancement

PAMELA

arXiv: 0908.0486, Wang, Xiong, Yang, Yu

arXiv: 0906.0362 Hooper, Tait

slide24

other visible modes (like )

are supressed

arXiv: 0908.0486, Wang, Xiong, Yang, Yu

slide25

3 Little Higgs Theory: LHT, SLH

LHT (littlest Higgs with T-parity) :

heavy photon AH : lightest T-odd particle (dark matter)

h  AH AH may be dominant

Br( h  XX)

arXiv: 0812.4609, Wang, Yang 

slide26

SLH (simplest little higgs):

CP-odd scalor : may be light

(pph)Br( h) suppressed

h     4 b may dominant

Br( H  XX)

thanks Xiao-Fang Han for plot this figure

arXiv: 0611294 , Cheung, Song  

slide27

4. Conclusion

2HDM (L2HDM, …)

SUSY (NMSSM, nMSSM, ...)

Little Higgs (LHT, SLH )

  • SM-like Higgs:
  • can be light (LEP2 bound relaxed)
  • exotic decays

. . . . . . . . .

  

 AH AH

Higgs

Boson

 a a

 dark matter

Hidden

Sector

Dark

Matter

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