SUSY Dark Matter in light of CDMS/XENON Results
Jin Min Yang
Institute of Theoretical Physics, Beijing
arXiv: 1006.4811, in PRD(R)
arXiv: 1005.0761, in JHEP
With Cao, Hikasa, Wang, Yu
2010.11.5 , Tsinghua Univ
Outline
1 Introduction: SUSY—Dark Matter—Higgs
2 Experimental Constraints on SUSY
2.1 Collider Constraints
2.2 Dark Matter Constraints
3 Currently Allowed SUSY Parameter Space
4 Implication for LHC Higgs Search
5 Conclusion
1. Introduction
Higgs
Boson
Dark
Matter
SUSY
In the following I will give a very brief discussion
1.1 About SUSY
standard non-standard theory – D. Gross
Edward Witten
International Conference on String Theory, Beijing, (Aug 17, 2002)
David Gross
August 17, 2002
S
RO
TF
R
EF
NO
GR
TC
HE
STRONG
Supersymmetry
WEAK
UNIFICATION
ELECTRO
Planck Scale
GRAVITY
Present day
observation
1012ev
LHC
1028ev
ENERGY
-- M. E. Peskin
ITP, Beijing, Aug. 2010
So we see exploring SUSY is very important !
Different models give different phenomenology
MSSM
NMSSM
SUSY
Models:
nMSSM
Split-SUSY
mSUGRA
MSSM
····
SUSY
1.2 SUSY Dark Matter: a miracle !
a byproduct of SUSY  DM
1
~0
(a perfect WIMP )
Perfect candidate for DM
Naturally give correct relic density
A miracle !
1.3 Higgs Bosons
---SUSY is the paradise of Higgs
• SM
(only one Higgs boson)
Will be found at LHC !
• SUSY (more than 5 Higgs)
h, H, A, H
How many can be seen at LHC ?
---depending on parameter space
Which part is chosen by nature ?
---current experimental constr.
2 Experimental Constraints on SUSY
• direct bounds (LEPI, LEPII, Tevatron)
• EW (S,T,U)
Rb
• B-decays
• muon anomalous a
• dark matter DM
• CDMSII/XENON
 
meet all constraints
at 2- level
2.1 Collider Constraints
(1) Direct Bounds:
• LEP I
• LEP II
• Tevatron
• LEP II
(2) Precision EW Data S, T, U
Rb
SUSY
(3) a


SUSY

(4) B-decays and mixings

2.2 Dark Matter Constraints
• Relic Density (WMAP)
Thermal equilibrium
  ff
Universe cools: n=nEQe-m/T
(i) Lightest nurtralino
solely composes
cosmic dark matter
Freeze out
(ii) Relic density in 2 range
(not only upper bounded)
1018 秒
• CDMS-II/XENON Limits:
• We do not consider
Cosmic Ray Anomaly (PAMELA, ATIC, ···)
as constraints on SUSY
Anyway, they can be explained by pulsars
3
Currently Allowed SUSY Parameter Space
Scan over parameter space
Red: CDMS-II covered region
Blue: SuperCDMS(25kg)/XENON100 (6000 kg-day)
Green: beyond SuperCDMS/XENON100
CDMS-II already make sense in testing SUSY!
bino-like
LSP (DM) property
singlino-like
CDMS/XENON will push LSP more bino-like
CDMS-II push LSP (DM) more bino-like
CDMS/XENON push up  value
higgsino component decrease
bino component increase
CDMS/XENON push up chargino (finally 2*LSP)
CDMS/XENON push up charged-Higgs
SM-like Higgs may decay to DM
How about split-SUSY ?
4 Implication for LHC MSSM-Higgs Search
charged-Higgs: almost unaccessible
neutral-Higgs (H,A) at LHC
CMS
5. Conclusion
(i) Current CDMS-II/XENON100 limits can exclude some parameter
space which survive the constraints from dark matter relic density
and various collider experiments: push up charged-Higgs, chargino
push LSP more bino-like
(ii) Future SuperCDMS/XENON100 (6000 kg-days exposure) will
significantly tighten the parameter space in case of null results
(iii) Currently, in allowed parameter space:
charged Higgs is hardly accessible at LHC
neutral non-SM Higgs bosons may be accessible in some
allowed region characterized by a large mu
Future SuperCDMS/XENON100 limits will further push away
non-SM Higgs bosons at the LHC
(iv) Interplay of LHC and CDMS/XENON: a good test for SUSY !
Thanks !