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04/18/23 S. Stark 1
Scan of the supersymmetric parameter space within mSUGRA
Luisa Sabrina Stark Schneebeli, IPP ETH Zurich
04/18/23 S. Stark 2
Outline
Astrophysics Particle Physics
• Cold Dark Matter
• Supersymmetry: mSUGRA scenario
• Monte Carlo Generators
• Preliminary Results
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Cold Dark Matter (CDM)
missing mass !
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Supersymmetry (SUSY)
Motivation: •Higgs boson needed to generate masses of weak gauge bosonsquantum fluctuations quadratic divergences
•SM no candidate for cold dark matter (CDM)
•…MSSM: Minimal supersymmetric extention of the SM
•doubling of SM particles & 2 complex Higgs doublets•new multiplicative symmetry: R-parity R = (-1)3B+2S+L
mSUGRA: Constrained modelonly 5 input parameter:m0, m12, tan, A0, sign()
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Supersymmetric CDM The lightest SUSY particle (LSP) is an excellent candidate
for CDM particles in the Universe:
LSP is massive, neutral, stable and interacts weakly with ordinary matter.
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ΩTOT =1.02 ± 0.02, h = 0.71−0.03+0.04
From WMAP and other Cosmological Data:From WMAP and other Cosmological Data:
Spergel et al.,arXiv:astro-ph/0302209
ΩCDMCDM=0.23±0.04 ; =0.23±0.04 ; Ω cc ;Hubble constant h= H ;Hubble constant h= H00/100km/100km-1-1ss-1-1MpcMpc-1-1
Astrophysics Particle Physics
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before WMAP results
mLSP ≈ 0.4 m1/2
mgluino ≈ 2.7 m1/2
CDM region using 0.1 < ΩCDM h2 < 0.3
J.Ellis et al, hep-ph/0303043
mSUGRA Parameter space:
m=200 GeV
mgl=1 TeV
msq=1 TeV50352010 5
tan =
m1/2 (GeV)
m0 (
GeV
)
Constraints from: WMAP+cosmol. data
Ω ΩCDMCDMhh22 < 0.129< 0.129
M.Battaglia et al, hep-ph/0306219
m0, m12, tan, A0, sign()
A0 = 0
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No systematic studies of the trilinear scalar coupling A0
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Monte Carlo Generators
SuSpect(Djouadi et al.), ISAJET(Baer et al.):
DarkSUSY(Edsjö et al.):
5 input parameter at GUT scale
Iterative application of renormalisation group equations
Couplings and mass spectraat the EW scale
WMAP cut on relic density
Calculation of the relic density
m0, m12, tan, A0, sign()
4`500`000 models generated
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Differences between SuSpect and ISAJET
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Differences in the relic density
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Preliminary results
The variation of the trilinear scalar coupling A0 strongly affects the allowed SUSY parameter space.