Post on 22-Jul-2020
AMS-02 results and decaying gravitino DM
Sho IWAMOTO
20th Nov. 2013
PASCOS 2013 Conference @ Taipei, Taiwan
Reference)
M. Ibe, SI, S. Matsumoto, T. Moroi, and N. Yokozaki,
JHEP 1308 (2013) 029 [1304.1483].
Kavli IPMU, Japan
Motivation
Hierarchy problem
SUSY !? Hierarchy solved.
“LSP” = DM candidate.
Higgs!!
2 /25
… MSUSY = ???
Motivation
Hierarchy problem
SUSY !? Hierarchy solved.
“LSP” = DM candidate.
Higgs!!
3 /25
… MSUSY = ???
Motivation
Hierarchy problem
SUSY !? Hierarchy solved.
“LSP” = DM candidate.
Higgs!!
4 /25
… MSUSY = ???
Motivation
Hierarchy problem
SUSY !? Hierarchy solved.
“LSP” = DM candidate.
Higgs!!
Decaying DM scenario (Gravitino with bilinear RPV)
5 /25
Underlying model (provides “suitably-tiny” bilinear RPV)
Outline
Hierarchy problem
SUSY !? Hierarchy solved.
“LSP” = DM candidate.
Higgs!!
Decaying DM scenario (Gravitino with bilinear RPV)
1
2
3
6 /25
Underlying model (provides “suitably-tiny” bilinear RPV)
Outline
Hierarchy problem
SUSY !? Hierarchy solved.
“LSP” = DM candidate.
Higgs!!
Decaying DM scenario (Gravitino with bilinear RPV)
1
2
3
7 /25
Underlying model (provides “suitably-tiny” bilinear RPV)
Standard Model
MSSM
λ is fixed by SUSY.
Large loop-correction is required.
Mass and/or mixing of scalar-top must be large.
Higgs mass : SM v.s. MSSM
8
tree one-loop level
where α is the stop mixing parameter.
Okada, Yamaguchi, Yanagida (1991) etc.
two adjustable parameters mh is a free parameter.
/25
Standard Model
MSSM
λ is fixed by SUSY.
Large loop-correction is required.
Mass and/or mixing of scalar-top must be large.
Higgs mass : SM v.s. MSSM
9
tree one-loop level
where α is the stop mixing parameter.
two adjustable parameters mh is a free parameter.
/25
Ibe, Yanagida [1112.2462]
If the mixing is small…
MSUSY [TeV]
tanβ
Okada, Yamaguchi, Yanagida (1991) etc.
Outline
Hierarchy problem
SUSY !? Hierarchy solved.
“LSP” = DM candidate.
Higgs!!
Decaying DM scenario (Gravitino with bilinear RPV)
1
2
3
10 /25
Underlying model (provides “suitably-tiny” bilinear RPV)
Outline
Hierarchy problem
SUSY !? Hierarchy solved.
“LSP” = DM candidate.
Higgs!!
Decaying DM scenario (Gravitino with bilinear RPV)
1
3
2
11 /25
Underlying model (provides “suitably-tiny” bilinear RPV)
Cosmic-ray positron fraction
12
PAMELA & AMS-02 coll. (Figure from PRL 110 (2013) 141102)
/25
Cosmic-ray positron fraction
13
PAMELA & AMS-02 coll. (Figure from PRL 110 (2013) 141102)
/25
fraction increases
A scenario for decaying DM
14
A decaying DM scenario
“SUSY with gravitino LSP
with bilinear R-parity violation”
(LSP, i.e., DM)
/25
DM
Results
15
Sample point
•Positron fraction •Electron total flux
/25
Outline
Hierarchy problem
SUSY !? Hierarchy solved.
“LSP” = DM candidate.
Higgs!!
Decaying DM scenario (Gravitino with bilinear RPV)
1
3
2
16 /25
Underlying model (provides “suitably-tiny” bilinear RPV)
Outline
Hierarchy problem
SUSY !? Hierarchy solved.
“LSP” = DM candidate.
Higgs!!
Decaying DM scenario (Gravitino with bilinear RPV)
1
2
3
17 /25
Underlying model (provides “suitably-tiny” bilinear RPV)
Results (review)
18
Sample point
•Positron fraction •Electron total flux
/25
RPV = tiny!
A model that provides the tiny bilinear R-parity violation
19
extra singlets
/25
A model that provides the tiny bilinear R-parity violation
20
extra singlets
MSSM
/25
A model that provides the tiny bilinear R-parity violation
21
extra singlets
MSSM
(mediated by X)
/25
A model that provides the tiny bilinear R-parity violation
22
extra singlets
MSSM
(mediated by X)
Bilinear RpV ~ O(10-5)GeV (as desired)
/25
A model that provides the tiny bilinear R-parity violation
23
extra singlets
MSSM
(mediated by X)
Majorana mass ~ O(1011)GeV
Bilinear RpV ~ O(10-5)GeV (as desired)
/25
Outline
Hierarchy problem
SUSY !? Hierarchy solved.
“LSP” = DM candidate.
Higgs!!
Decaying DM scenario (Gravitino with bilinear RPV)
1
2
3
24 /25
Underlying model (provides “suitably-tiny” bilinear RPV)
1. Decaying Gravitino dark matter
is motivated by the Higgs mass
explains the AMS-02 results with
2. Model for the bilinear RpV
Summary
25
through bilinear R-parity violation
/25
Backup
26 /25
Antiproton constraint
27 /25
is on the edge of anti-proton constraint. DM
Garny, Ibarra, Tran [1205.6783] See also: Delahaye and Grefe [1305.7183] primary = from DM decay
secondary = spallation on interstellar gas
dependence on propagation-model