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Scan of the supersymmetric parameter space within mSUGRA

Luisa Sabrina Stark Schneebeli, IPP ETH Zurich

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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.