Transcript ASBS2 - University of Arizona

SuperWIMP Dark Matter (II)
SUSY WIMP and Collider Signatures
Shufang Su • U. of Arizona
J. Feng, F. Takayama, S. Su
Work in progress…
WIMP  SWIMP + SM particle
Takayama’s talk
FRT hep-ph/0302215, 0306024
WIMP
104 s  t  108 s
SWIMP
SM
 Gravitino LSP
 LKK graviton
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S. Su SWIMP
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SWIMP and SUSY WIMP
 SUSY case
~ (LSP)
SWIMP: G
WIMP: NLSP mG» mNLSP
Ellis et. al., hep-ph/0312262
104 s  t  108 s
~
NLSP  G + SM particles
Neutralino/Chargino NLSP Slepton NLSP
EM
BBN
had
Brhad  O(0.01)
S. Su SWIMP
Brhad  O(10-3)
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Slepton NLSP lifetime
 When does it decay ?
~
~
l  G + l
S. Su SWIMP
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Slepton NLSP hadronic decay
 How much hadronic energy released ?
 had » ml~-mG
~
~
l  G + l0+ Z/W
 Brhad
Brhad
~
Brhad
~
R
 YNLSP
S. Su SWIMP
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BBN Constraints on Hadronic Injection
hadBrhadYNLSP 
(2 £ 10-12 – 4£ 10-13 ) GeV
Yanagida, talk at DESY, 2003
(prelimenary)
BrhadYNLSP  (2-6) £ 10-15
Dimopoulos et. al.,
NPB 311, 699 (1989)
Need updated analyses of
BBN constraints on
hadronic /EM injection
S. Su SWIMP
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Favored Mass Region
SWIMP h2=0.23
500 GeV  mR
~
not favored
by BBN had
~

~
R
 m  30-200 GeV
BrhadYNLSP  (2-6) £ 10-15
S. Su SWIMP
had
not favored
by BBN EM
hadBrhadYNLSP  (2 £ 10-12 – 4£ 10-13 ) GeV
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Collider Phenomenology
 SWIMP Dark Matter
 no signals in direct / indirect Drell-Yang
dark matter searches
 SUSY slepton NLSP: rich collider phenomenology
 Slepton NLSP production
 Tevatron/LHC: Drell-Yang
WBF
~
lR
 LHC: WBF
 LC:
~
lL
m  Ecm/2
 study nature of NLSP
 distinguish DM scenario
 precise measurement
of sparticle
mass
and couplings
Choudhury
et. al., PRD
68, 075007
(2003)
S. Su SWIMP
Baer, Harris and Reno, PRD 57, 5871 (1998)
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Charged Slepton NLSP
Slepton NLSP: stable inside the detector
 Charged slepton highly ionizing track, almost background free
 charged track in tracking chamber, hit muon detector
 little hadronic activities in calorimeters
 slow moving: large dE/dx, TOF information
 Collider searches:
 RUN I and Run II search for highly ionizing particle
 LEP searches for stable stau in GMSB
m  99 GeV at 95% C.L. Cerutti et. al., LEPSUSYWG/02-05.1
 prospect at Tevatron RUN II Feng and Moroi, PRD 58, 035001 (1998)
110/180/230 GeV for L=2, 10, 30 fb-1
5 event
 LHC cover m » 90 – 700 GeV for L=100 fb-1 (GMSB)
Acosta, talk at HCP2002
Distinguish from stau NLSP and gravitino LSP in GMSB
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Sneutrino NLSP
 Sneutrino NLSP missing energy
Signal: energetic jets/leptons + missing energy
Is it a sneutrino NLSP in SWIMP scenario
or neutralino LSP in usual SUSY WIMP scenario?
 angular distribution of events (LC)
 direct/indirect dark matter searches (cosmo)
 Collider searches:
 invisible Z decay width Hebbeker, PLB 470, 259 (1999)
m  44.6 GeV at 95% C.L.
 detail study for metastable sneutrino NLSP is needed
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Conclusions
SWIMP is possible candidate for dark matter
SUSY models: gravitino LSP (SWIMP) slepton NLSP (WIMP)
Constraints from BBN: EM injection and hadronic injection
need updated studies of BBN constraints on hadronic/EM injection
Favored mass region: (enlarged if SWIMPh2<0.23)
 Sneutrino:  m  30-200 GeV, m~  100 GeV
 Charged ~
R: 500 GeV  m~R
Rich collider phenomenology
 Charged slepton: highly ionizing track
distinguish from metastable stau in GMSB
 Sneutrino: missing energy
distinguish from usual neutralino LSP case
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