Searches in CMS for New Physics in Final States with Leptons

Abstract

Many new physics models, such as the Sequential Standard Model, Grand Unified Theories, models of extra dimensions, or models like leptoquarks or vector-like leptons, predict heavy mediators at the TeV energy scale. We present recent results of such searches in leptonic final states obtained using data recorded by the CMS experiment during Run-II of the LHC.

Figures (5)

• Figure 1: Left: observed and expected 95% CL exclusion contours in the $(m_{\tilde{\chi}_1^\pm}, \Delta m(\tilde{\chi}_2^0,\tilde{\chi}_1^0))$ plane for the wino--bino model. Right: comparison of the observed limit for the higgsino scenario with complementary CMS analyses based on isolated soft tracks and disappearing tracks.
• Figure 2: Left: two-dimensional distribution showing the diagonal signal region $m_{\mu\mu}\approx m_{hh}$. Right: observed and expected 95% CL upper limits on $\mathcal{B}(H\to SS)$ versus scalar mass and lifetime.
• Figure 3: Left: distribution of the reconstructed visible mass compared to background prediction. Right: observed and expected 95% CL limits on $\sigma(pp\to\phi\to\tau\tau)$ as a function of resonance mass.
• Figure 4: Left:distribution of the boosted decision tree (BDT) output score for the combined analysis region, illustrating the agreement between data and the stacked background prediction, with the lower panel showing the Data/MC ratio. Right:observed and expected 95% confidence level upper limits on the production cross section times branching fraction $\sigma(pp\!\to\!{\rm LQ})\,\mathcal{B}({\rm LQ}\!\to\!\mu q)$ as a function of the leptoquark mass, for a coupling value of $\lambda_{u\mu}=1$.
• Figure 5: Results of the ALP search (EXO-24-031). Left: distribution of the four-electron invariant mass compared with the background-only fit. Right: observed and expected 95% CL limits on $\mathcal{B}(H\to aa\to4e)$ versus $m_a$ for representative lifetimes.