Likelihood analysis of the minimal AMSB model

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

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We perform a likelihood analysis of the minimal anomaly-mediated supersymmetry-breaking (mAMSB) model using constraints from cosmology and accelerator experiments. We find that either a wino-like or a Higgsino-like neutralino LSP,χ~10,may provide the cold dark matter (DM),both with similar likelihoods. The upper limit on the DM density from Planck and other experiments enforces mχ~10≲3TeV after the inclusion of Sommerfeld enhancement in its annihilations. If most of the cold DM density is provided by the χ~10,the measured value of the Higgs mass favours a limited range of tan β∼ 5 (and also for tan β∼ 45 if μ> 0) but the scalar mass m0 is poorly constrained. In the wino-LSP case, m3/2 is constrained to about 900 TeV and mχ~10 to 2.9±0.1 TeV, whereas in the Higgsino-LSP case m3/2 has just a lower limit ≳650TeV (≳480TeV) and mχ~10 is constrained to 1.12 (1.13)± 0.02 TeV in the μ> 0(μ<0) scenario. In neither case can the anomalous magnetic moment of the muon, (g-2)μ, 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 χ~10 contributes only a fraction of the cold DM density, future LHC [InlineEquation not available: see fulltext.]-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 BR(Bs,d→μ+μ-) to agree with the data better than in the SM in the case of wino-like DM with μ> 0.

Original languageEnglish (US)
Article number268
JournalEuropean Physical Journal C
Issue number4
StatePublished - Apr 1 2017

Bibliographical note

Funding Information:
The work of E.B. and G.W. is supported in part by the Collaborative Research Center SFB676 of the DFG, "Particles, Strings and the early Universe", and by the European Commission through the "HiggsTools" Initial Training Network PITN-GA-2012-316704. The work of R.C. is supported in part by the National Science Foundation under Grant No. PHY-1151640 at the University of Illinois Chicago and in part by Fermilab, operated by Fermi Research Alliance, LLC under Contract No. De-AC02-07CH11359 with the United States Department of Energy. This work of M.J.D. is supported in part by the Australian Research Council. The work of J.E. is supported in part by STFC (UK) via the research Grant ST/L000326/1, and the work of H.F. is also supported in part by STFC (UK). The work of S.H. is supported in part by CICYT (Grant FPA 2013-40715-P) and by the Spanish MICINN's Consolider-Ingenio 2010 Program under Grant MultiDark CSD2009-00064. The work of D.M.-S. is supported by the European Research Council via Grant BSMFLEET 639068. The work of F.L. is supported by World Premier International Research Center Initiative (WPI), MEXT, Japan. The work of K.A.O. is supported in part by DOE Grant DE-SC0011842 at the University of Minnesota. KS is supported by STFC through the IPPP grant. The work of K.S. is partially supported by the National Science Centre, Poland, under research Grants DEC-2014/15/B/ST2/02157 and DEC-2015/18/M/ST2/00054.

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