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Title: Likelihood Analysis of the Minimal AMSB Model

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 $$\mu > 0$$.

Authors:
ORCiD logo [1]; ORCiD logo [2];  [3];  [4];  [5];  [2];  [4];  [4];  [6];  [7];  [8];  [9];  [10];  [11];  [2];  [12];  [2];  [13];  [4];  [4]
  1. Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
  2. Santiago de Compostela Univ. (Spain)
  3. Univ. of Warsaw (Poland); Univ. of Durham (United Kingdom)
  4. Imperial College, London (United Kingdom)
  5. Univ. of Illinois, Chicago, IL (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
  6. Antwerp Univ. (Belgium); European Organization for Nuclear Research (CERN), Geneva (Switzerland)
  7. Univ. of Melbourne (Australia)
  8. European Organization for Nuclear Research (CERN), Geneva (Switzerland); King's College London (United Kingdom)
  9. Bristol Univ. (United Kingdom)
  10. Consejo Superior de Investigaciones Cientificas (CSIC), Madrid (Spain)
  11. Univ. of Zurich (Switzerland)
  12. Univ. of Tokyo (Japan)
  13. Univ. of Minnesota, Minneapolis, MN (United States)
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1353303
Alternate Identifier(s):
OSTI ID: 1354877
Report Number(s):
CERN-PH-TH-2016-220; arXiv:1612.05210; FERMILAB-PUB-16-502-CMS; DESY-16-155; KCL-PH-TH-2016-58; CERN-TH-2016-220; IFT-UAM-CSIC-16-112; IPMU-16-0157; FTPI-MINN-16-30; UMN-TH-3610-16; IPPP-16-104
Journal ID: ISSN 1434-6044; 1504084
Grant/Contract Number:
AC02-07CH11359
Resource Type:
Journal Article: Published Article
Journal Name:
European Physical Journal. C, Particles and Fields
Additional Journal Information:
Journal Volume: C77; Journal Issue: 4; Journal ID: ISSN 1434-6044
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Bagnaschi, E., Borsato, M., 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., Martínez Santos, D., Olive, K. A., Richards, A., and Weiglein, G. Likelihood Analysis of the Minimal AMSB Model. United States: N. p., 2017. Web. doi:10.1140/epjc/s10052-017-4810-0.
Bagnaschi, E., Borsato, M., 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., Martínez Santos, D., Olive, K. A., Richards, A., & Weiglein, G. Likelihood Analysis of the Minimal AMSB Model. United States. doi:10.1140/epjc/s10052-017-4810-0.
Bagnaschi, E., Borsato, M., 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., Martínez Santos, D., Olive, K. A., Richards, A., and Weiglein, G. Thu . "Likelihood Analysis of the Minimal AMSB Model". United States. doi:10.1140/epjc/s10052-017-4810-0.
@article{osti_1353303,
title = {Likelihood Analysis of the Minimal AMSB Model},
author = {Bagnaschi, E. and Borsato, M. and Sakurai, K. and Buchmueller, O. and Cavanaugh, R. and Chobanova, V. and Citron, M. and Costa, J. C. and De Roeck, A. and Dolan, M. J. and Ellis, J. R. and Flächer, H. and Heinemeyer, S. and Isidori, G. and Lucio, M. and Luo, F. and Martínez Santos, D. and Olive, K. A. and Richards, A. and Weiglein, G.},
abstractNote = {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 $\mu > 0$.},
doi = {10.1140/epjc/s10052-017-4810-0},
journal = {European Physical Journal. C, Particles and Fields},
number = 4,
volume = C77,
place = {United States},
year = {Thu Apr 27 00:00:00 EDT 2017},
month = {Thu Apr 27 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1140/epjc/s10052-017-4810-0

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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 a wino-like or a Higgsino-like neutralino LSP,more » $$m_{\tilde \chi^0_{1}}$$, 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 $$\mu > 0$$.« less
  • In anticipation of data from the Large Hadron Collider (LHC) and the potential discovery of supersymmetry, we calculate the odds of the next-to-minimal version of the popular supergravity motivated model (NmSuGra) being discovered at the LHC to be 4:3 (57%). We also demonstrate that viable regions of the NmSuGra parameter space outside the LHC reach can be covered by upgraded versions of dark matter direct detection experiments, such as super-CDMS, at 99% confidence level. Due to the similarities of the models, we expect very similar results for the constrained minimal supersymmetric standard model (CMSSM)
  • Supersymmetric models based on anomaly-mediated SUSY breaking (AMSB) generally give rise to a neutral wino as a WIMP cold dark matter (CDM) candidate, whose thermal abundance is well below measured values. Here, we investigate four scenarios to reconcile AMSB dark matter with the measured abundance: 1. non-thermal wino production due to decays of scalar fields (e.g. moduli), 2. non-thermal wino production due to decays of gravitinos, 3. non-thermal wino production due to heavy axino decays, and 4. the case of an axino LSP, where the bulk of CDM is made up of axions and thermally produced axinos. In cases 1more » and 2, we expect wino CDM to constitute the entire measured DM abundance, and we investigate wino-like WIMP direct and indirect detection rates. Wino direct detection rates can be large, and more importantly, are bounded from below, so that ton-scale noble liquid detectors should access all of parameter space for m{sub Z-bar} {sub 1}∼<500 GeV. Indirect wino detection rates via neutrino telescopes and space-based cosmic ray detectors can also be large. In case 3, the DM would consist of an axion plus wino admixture, whose exact proportions are very model dependent. In this case, it is possible that both an axion and a wino-like WIMP could be detected experimentally. In case 4., we calculate the re-heat temperature of the universe after inflation. In this case, no direct or indirect WIMP signals should be seen, although direct detection of relic axions may be possible. For each DM scenario, we show results for the minimal AMSB model, as well as for the hypercharged and gaugino AMSB models.« less
  • Stringent limits are set on the long-lived lepton-like sector of the phenomenological minimal supersymmetric standard model (pMSSM) and the anomaly-mediated supersymmetry breaking (AMSB) model. We derived the limits from the results presented in a recent search for long-lived charged particles in proton–proton collisions, based on data collected by the CMS detector at a centre-of-mass energy of 8 TeV at the Large Hadron Collider. In the pMSSM parameter sub-space considered, 95.9 % of the points predicting charginos with a lifetime of at least 10 ns are excluded. Furthermore, these constraints on the pMSSM are the first obtained at the LHC. Charginosmore » with a lifetime greater than 100 ns and masses up to about 800 GeV in the AMSB model are also excluded. Furthermore, the method described can also be used to set constraints on other models.« less