The Real Gauge Singlet Scalar Extension of Standard Model: A Possible Candidate of Cold Dark Matter

Details The Real Gauge Singlet Scalar Extension of Standard Model: A Possible Candidate of Cold Dark Matter The Real Gauge Singlet Scalar Extension of Standard Model: A Possible Candidate of Cold Dark Matter

2011-02-15

arxiv.org/abs/1102.3024v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

20 pages, New calculations, figures and references added

Scientific paper

We consider a simplest extension of Standard Model in which a real SM gauge singlet scalar with an additional discrete symmetry $Z_2$ is introduced to SM. This additional scalar can be a viable candidate of cold dark matter since the stability of $S$ is achieved by the application of $Z_2$ symmetry on $S$. Considering $S$ as a possible candidate of cold dark matter we have solved Boltzmann's equation to find the freeze out temperature and relic density of $S$ for two values of Higgs masses namely 120 GeV and 185 GeV in the scalar mass range 5 GeV to 1 TeV. As $HHSS$ coupling $\delta_2$ appearing in Lagrangian depends upon the value of scalar mass $m_S$ and Higgs mass $m_h$, we have constrained the $m_S - \delta_2$ parameter space by using the WMAP limit on the relic density of dark matter in the universe and the results of recent ongoing dark matter direct search experiments namely CDMS-II, CoGeNT, DAMA, EDELWEISS-II, XENON-10, XENON-100. From such analysis we find two distinct mass regions (a lower and higher mass domain) for such a dark matter candidate that satisfy both the WMAP limit and the experimental results considered here. Finally we have estimated the possible differential direct detection rates and annual variation of total detection rates for this scalar dark matter candidate $S$ for three detector materials namely Ge, Xe, NaI.

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