Sparticle Spectroscopy and Dark Matter in a $U(1{)}_{B-L}$ extension of MSSM

Abstract

We consider a class of SUSY models in which the MSSM gauge group is supplemented with a gauged $U(1{)}_{B-L}$ symmetry and a global $U(1{)}_R$ symmetry. This extension introduces only electrically neutral states, and the new SUSY partners effectively double the number of states in the neutralino sector that now includes a blino (from $B-L$) and singlino from a gauge singlet superfield. If the DM density is saturated by a LSP neutralino, the model yields quite a rich phenomenology depending on the DM composition. The LSP relic density constraint provides a lower bound on the stop and gluino masses of about 3 TeV and 4 TeV respectively, which is testable in the near future collider experiments such as HL-LHC. The chargino mass lies between 0.24 TeV and about 2.0 TeV, which can be tested based on the allowed decay channels. We also find $m_{{\tilde{\tau }}_1}\gtrsim 500$ GeV, and $m_{\tilde{e}},m_{\tilde{\mu }},m_{{\tilde{\nu }}^{S,P}}\gtrsim 1$ TeV. We identify chargino-neutralino coannihilation processes in the mass region $0.24\mathrm{TeV}\lesssim m_{{\tilde{\chi }}_1^0}\approx m_{{\tilde{\chi }}_1^{\pm }}\lesssim 1.5$ TeV, and also coannihilation processes involving stau, selectron, smuon and sneutrinos for masses around 1 TeV. In addition, $A_2$ resonance solutions are found around 1 TeV, and $H_2$ and $H_3$ resonance solutions are also shown around 0.5 TeV and 1 TeV . Some of the $A_2$ resonance solutions with $\tan \beta \gtrsim 20$ may be tested by the $A/H\to {\tau }^{+}{\tau }^{-}$ LHC searches. While the relic density constraint excludes the bino-like DM, it is still possible to realize higgsino, singlino and blino-like DM for various mass scales. We show that all these solutions will be tested in future direct detection experiments such as LUX-Zeplin and Xenon-nT.

23 pages,4 figures

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