Stau pairs from natural SUSY at high luminosity LHC

Journal Article · Tue Jul 16 00:00:00 EDT 2024 · Physical Review. D.

DOI:https://doi.org/10.1103/PhysRevD.110.015017· OSTI ID:2403374

Baer, Howard; Barger, Vernon; Zhang, Kairui

Natural supersymmetry (SUSY) with light Higgsinos is perhaps the most plausible of all weak scale SUSY models while a variety of motivations point to (right) tau sleptons as the lightest of all the sleptons. We examine a SUSY model line with rather light right staus embedded within natural SUSY. For light ${\tilde{\tau }}_1$ of a few hundred GeV, the decays ${\tilde{\tau }}_1\to \tau {\tilde{\chi }}_{1,2}^0$ and ${\nu }_{\tau }{\tilde{\chi }}_1^{-}$ occur at comparable rates where the (Higgsino-like) ${\tilde{\chi }}_1^{\pm }$ and ${\tilde{\chi }}_2^0$ release only small visible energy: in this case, the expected ${\tau }^{+}{\tau }^{-}+{\overline{)E}}_T$ signature is diminished from the usual expectations due to the presence of the nearly invisible decay mode ${\tilde{\tau }}_1\to {\nu }_{\tau }{\tilde{\chi }}_1^{-}$ . However, once $m_{{\tilde{\tau }}_1}\gtrsim m\left(bino\right)$ , decays to binos such as ${\tilde{\tau }}_1\to \tau {\tilde{\chi }}_3^0$ open up where ${\tilde{\chi }}_3^0$ decays to Higgsinos plus $W^{\pm }$ , $Z^0$ , and $h$ at comparable rates. For these heavier staus, the stau pair production gives rise to $\text{diboson}+{\overline{)E}}_T$ events, which may contain 0, 1, or 2 additional hard $\tau$ leptons. From these considerations, we examine the potential for future discovery of tau-slepton pair production at a high-luminosity LHC. While we do not find a $5\sigma$ HL-LHC discovery reach for $3000{\mathrm{fb}}^{-1}$ , we do find a 95% CL exclusion reach, ranging between $m_{{\tilde{\tau }}_1}:100–450\mathrm{GeV}$ for $m_{{\tilde{\chi }}_1^0}\sim 100\mathrm{GeV}$ . This latter reach disappears for $m_{{\tilde{\chi }}_1^0}\gtrsim 200\mathrm{GeV}$ .

Published by the American Physical Society 2024

• Research Organization: Univ. of Oklahoma, Norman, OK (United States)
• Sponsoring Organization: USDOE Office of Science (SC); USDOE Office of Science (SC), High Energy Physics (HEP)
• Grant/Contract Number: SC0009956
• OSTI ID: 2403374
• Alternate ID(s): OSTI ID: 2579504
• Journal Information: Physical Review. D., Journal Name: Physical Review. D. Journal Issue: 1 Vol. 110; ISSN PRVDAQ; ISSN 2470-0010
• Publisher: American Physical Society
• Country of Publication: United States
• Language: English

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