### Charginos and Neutralinos in the Light of Radiative Corrections: Sealing the Fate of Higgsino Dark MatterCharginos and Neutralinos in the Light of Radiative Corrections: Sealing the Fate of Higgsino Dark Matter

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 Author Ellis, John ♦ Falk, Toby ♦ Ganis, Gerardo ♦ Olive, Keith A. ♦ Schmitt, Michael Source arXiv.org Content type Text File Format PDF Date of Submission 1998-01-29 Language English
 Subject Domain (in DDC) Computer science, information & general works ♦ Natural sciences & mathematics ♦ Astronomy & allied sciences ♦ Physics Subject Keyword High Energy Physics - Phenomenology ♦ Astrophysics ♦ physics:astro-ph ♦ physics:hep-ph Abstract We analyze the LEP constraints from searches for charginos $\chi^{\pm}$ and neutralinos $\chi_i$, taking into account radiative corrections to the relations between their masses and the underlying Higgs-mixing and gaugino-mass parameters $\mu, m_{1/2}$ and the trilinear mass parameter $A_t$. Whilst radiative corrections do not alter the excluded domain in $m_{\chi^{\pm}}$ as a function of $m_{\chi^{\pm}} - m_{\chi}$, its mapping into the $\mu, m_{1/2}$ plane is altered. We update our previous lower limits on the mass of gaugino dark matter and on tan$\beta$, the ratio of Higgs vacuum expectation values, in the light of the latest LEP data and these radiative corrections. We also discuss the viability of Higgsino dark matter, incorporating co-annihilation effects into the calculation of the Higgsino relic abundance. We find that Higgsino dark matter is viable for only a very limited range of $\mu$ and $m_{1/2}$, which will be explored completely by upcoming LEP runs. Description Reference: Phys.Rev.D58:095002,1998 Educational Use Research Learning Resource Type Article Page Count 21