We explore the parameter space of the phenomenological minimal supersymmetric standard model with a light neutralino thermal dark matter ($m_{{\tilde{\chi }}_1^0}\le m_h/2$) that is consistent with current collider and astrophysical constraints. We consider both positive and negative values of the higgsino mass parameter ($\mu$). Our investigation shows that the recent experimental results from the LHC as well as from direct detection searches for dark matter by the LUX-ZEPLIN Collaboration rule out the $Z$-funnel region for the $\mu >0$ scenario. The same results severely restrict the $h$-funnel region for positive $\mu$; however, the allowed points can be probed easily with few more days of data from the LUX-ZEPLIN experiment. In the $\mu <0$ scenario, we find that very light higgsinos in both the $Z$ and $h$ funnels might survive the present constraints from the electroweakino searches at the LHC, and dedicated efforts from experimental collaborations are necessary to make conclusive statements about their present status.

• Received 26 July 2022
• Revised 2 May 2023
• Accepted 25 May 2023

DOI:https://doi.org/10.1103/PhysRevLett.131.011802

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP³.

Published by the American Physical Society