Is it SUSY?

Abstract

If a signal for physics beyond the Standard Model is observed at the Tevatron collider or LHC, we will be eager to interpret it. Because only certain observables can be studied at a hadron collider, it will be difficult or impossible to measure masses and spins that could easily establish what physics was being seen. Nevertheless, different underlying physics implies different signatures. We examine the main signatures for supersymmetry, with some emphasis on recognizing supersymmetry in parts of parameter space where generic signatures are reduced or absent. We also consider how to distinguish supersymmetry from alternatives that most closely resemble it, such as Universal Extra Dimensions (UED). Using the robust connection between spins and production cross section, we think it will not be difficult to distinguish UED from supersymmetry. We expect that by considering patterns of signatures it is very likely that it will not be difficult to find a compelling interpretation of any signal of new physics.

Figures (11)

• Figure 1: Inclusive rates in a somewhat usual paradigm of $M_1 < M_2 < M_3$ with an arbitrary choice of $M_2=1.3 \, M_1$ and with (i) $m_{\tilde{q}} > m_{\tilde{g}}$ in the upper panel and (ii) $m_{\tilde{g}} > m_{\tilde{q}}$ in the bottom panel. The upper (bottom) left one is with a fixed squark/sfermion mass of 4 TeV (500 GeV) and varying gluino mass while for the upper (bottom) right it is the reverse variation with the gluino mass fixed at 500 GeV (1.5 TeV). Other relevant parameters are $\mu=500$ GeV, $M_2=300$ GeV, $\tan\beta=10$.
• Figure 2: Inclusive rates as a function of (a) $M_2$ with $\mu=750$ GeV and (b) $\mu$ for $M_2=400$ GeV when $m_{\tilde{q}} (1 \, {\mathrm {TeV}}) > m_{\tilde{g}} (500 \, {\mathrm {GeV}})$. Other relevant inputs are $M_2=2 \, M_1$ and $\tan\beta=10$.
• Figure 3: Inclusive rates as a function of (a) $M_2$ with $\mu=750$ GeV and (b) $\mu$ for $M_2=500$ GeV when $m_{\tilde{q}} (500 \, {\mathrm {GeV}}) < m_{\tilde{g}} (1 \, {\mathrm {TeV}})$. Other relevant inputs are $M_2=2 \, M_1$ and $\tan\beta=10$.
• Figure 4: Inclusive rates as a function of (a) $M_2$ with $\mu=1$ TeV and (b) $\mu$ for $M_2=600$ GeV when $m_{\tilde{q}}=5$ TeV and $m_{\tilde{g}}=1$ TeV. Other relevant inputs are $M_2=2 \, M_1$ and $\tan\beta=10$.
• Figure 5: Variation of inclusive rates as a function of $m_{\tilde{q}_L}$ for $m_{\tilde{q}_R} < m_{\tilde{g}} < m_{\tilde{q}_L}$ (left) and $m_{\tilde{t}_1} < m_{\tilde{g}} < m_{\tilde{q}_L}=m_{\tilde{q}_R}$ (right), for $m_{\tilde{g}}=1$ TeV and $m_{\tilde{q}_R} (m_{\tilde{t}_1})=750$ GeV. Other relevant SUSY paramters are $M_2=2M_1=500$ GeV, $\mu=1$ TeV, $\tan\beta=10$.