R-Parity Breaking via Type II Seesaw, Decaying Gravitino Dark Matter and PAMELA Positron Excess

We propose a new class of R-parity violating extension of MSSM with type II seesaw mechanism for neutrino masses where an unstable gravitino is the dark matter of the Universe. It decays predominantly into three leptons final states, thereby providing a natural explanation of the positron excess but no antiproton excess in the PAMELA experiment. The model can explain neutrino masses without invoking any high scale physics while keeping the pre-existing baryon asymmetry of the universe in tact.

Note:

13 pages, 6 figures; accepted for publication in PLB

neutrino: mass
gravitino: dark matter
gravitino: leptonic decay
gravitino: lifetime
positron: cosmic radiation
cosmic radiation: diffusion
cosmic radiation: flux
final state: (3lepton)
R parity: violation
baryon: asymmetry

References(76)

Figures(7)

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PAMELA

Collaboration

•

Oscar Adriani
(
- Florence U. and
- INFN, Florence
)

et al.

- Nature 458 (2009) 607-609
•
e-Print:
- 0810.4995
•
DOI:
- 10.1038/nature07942

A new measurement of the antiproton-to-proton flux ratio up to 100 GeV in the cosmic radiation

O. Adriani
(
- Florence U. and
- INFN, Florence
)
,
G.C. Barbarino
(
- Naples U. and
- INFN, Naples
)
,
G.A. Bazilevskaya
(
- Lebedev Inst.
)
,
R. Bellotti
(
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- INFN, Bari
)
,
M. Boezio
(
- INFN, Trieste
)

et al.

- Phys.Rev.Lett. 102 (2009) 051101
•
e-Print:
- 0810.4994
•
DOI:
- 10.1103/PhysRevLett.102.051101

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HEAT

Collaboration

•

S.W. Barwick
(
- UC, Irvine
)

et al.

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•
e-Print:
- astro-ph/9703192
•
DOI:
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AMS 01

Collaboration

•

M. Aguilar
(
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et al.

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•
e-Print:
- astro-ph/0703154
•
DOI:
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TeV Gamma Rays from Geminga and the Origin of the GeV Positron Excess

Hasan Yuksel
(
- Delaware U., Bartol Inst. and
- Delaware U.
)
,
Matthew D. Kistler
(
- Ohio State U., CCAPP and
- Ohio State U.
)
,
Todor Stanev
(
- Delaware U., Bartol Inst. and
- Delaware U.
)

- Phys.Rev.Lett. 103 (2009) 051101
•
e-Print:
- 0810.2784
•
DOI:
- 10.1103/PhysRevLett.103.051101

Pulsars as the Sources of High Energy Cosmic Ray Positrons

Dan Hooper
(
- Chicago U., Astron. Astrophys. Ctr. and
- Fermilab
)
,
Pasquale Blasi
(
- Arcetri Observ. and
- Fermilab and
- Gran Sasso
)
,
Pasquale Dario Serpico
(
- CERN and
- Fermilab
)

- JCAP 01 (2009) 025
•
e-Print:
- 0810.1527
•
DOI:
- 10.1088/1475-7516/2009/01/025

New Positron Spectral Features from Supersymmetric Dark Matter - a Way to Explain the PAMELA Data?

- Phys.Rev.D 78 (2008) 103520
•
e-Print:
- 0808.3725
•
DOI:
- 10.1103/PhysRevD.78.103520

Minimal Dark Matter predictions and the PAMELA positron excess

Marco Cirelli
(
- Saclay, SPhT
)
,
Alessandro Strumia
(
- Pisa U. and
- INFN, Pisa
)

- PoS IDM2008 (2008) 089,
- Proceedings of IDM 2008: 7th International Workshop on the Identification of Dark Matter 2008, Stockholm, Sweden, 18-22 Aug 2008
•
e-Print:
- 0808.3867
•
DOI:
- 10.22323/1.064.0089