Likelihood Analysis of the Minimal AMSB Model

Bagnaschi, E.; Sakurai, K.; Lucio, M.; Cavanaugh, R.; Olive, K. A.; Isidori, G.; Ellis, J. R.; Buchmueller, O.; Luo, F.; Borsato, M.; De Roeck, A.; Dolan, M. J.; Richards, A.; Santos, D. Martínez; Chobanova, V.; Citron, M.; Costa, J. C.; Heinemeyer, S.; Weiglein, G.; Flächer, H.

Preprint/Report

PUBDB-2016-06707

Likelihood Analysis of the Minimal AMSB Model

Bagnaschi, E.DESY* ; Borsato, M. (Corresponding author) ; Sakurai, K. ; Buchmueller, O. ; Cavanaugh, R. ; Chobanova, V. ; Citron, M. ; Costa, J. C. ; De Roeck, A. ; Dolan, M. J. ; Ellis, J. R. ; Flächer, H. ; Heinemeyer, S. ; Isidori, G. ; Lucio, M. ; Luo, F. ; Santos, D. M. ; Olive, K. A. ; Richards, A. ; Weiglein, G.DESY*

2016

[10.3204/PUBDB-2016-06707]

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Please use a persistent id in citations: doi:10.3204/PUBDB-2016-06707

Report No.: CERN-PH-TH-2016-220; DESY-16-155; FERMILAB-PUB-16-502-CMS; FTPI-MINN-16-30; IFT-UAM-CSIC-16-112; IPMU16-0157; IPPP-16-104; KCL-PH-TH-2016-58; UMN-TH-3610-16; arXiv:1612.05210

Abstract: We perform a likelihood analysis of the minimal Anomaly-Mediated Supersymmetry Breaking (mAMSB) model using constraints from cosmology and accelerator experiments. We find that a wino-like or a Higgsino-like neutralino LSP, $m_{\tilde \chi^0_{1}}$, may provide the cold dark matter (DM) with similar likelihood. The upper limit on the DM density from Planck and other experiments enforces $m_{\tilde \chi^0_{1}} \lesssim 3~TeV$ after the inclusion of Sommerfeld enhancement in its annihilations. If most of the cold DM density is provided by the $\tilde \chi_0^1$, the measured value of the Higgs mass favours a limited range of $\tan \beta \sim 5$ (or for $\mu > 0$, $\tan \beta \sim 45$) but the scalar mass $m_0$ is poorly constrained. In the wino-LSP case, $m_{3/2}$ is constrained to about $900~TeV$ and ${m_{\tilde \chi^0_{1}}}$ to $2.9\pm0.1~TeV$, whereas in the Higgsino-LSP case $m_{3/2}$ has just a lower limit $\gtrsim 650TeV$ ($\gtrsim 480TeV$) and $m_{\tilde \chi^0_{1}}$ is constrained to $1.12 ~(1.13) \pm0.02~TeV$ in the $\mu>0$ ($\mu<0$) scenario. In neither case can the anomalous magnetic moment of the muon, ${(g-2)_\mu}$, be improved significantly relative to its Standard Model (SM) value, nor do flavour measurements constrain the model significantly, and there are poor prospects for discovering supersymmetric particles at the LHC, {though there} are some prospects for direct DM detection. On the other hand, if the ${m_{\tilde \chi^0_{1}}}$ contributes only a fraction of the cold DM density, {future LHC $E_T$-based searches for gluinos, squarks and heavier chargino and neutralino states as well as disappearing track searches in the wino-like LSP region will be relevant}, and interference effects enable ${\rm BR}(B_{s, d} \to \mu^+\mu^-)$ to agree with the data better than in the SM in the case of wino-like DM with $\mu > 0$.

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