Likelihood Analysis of the pMSSM11 in Light of LHC 13-TeV Data

Bagnaschi, Emanuele; Sakurai, K.; Lucio, M.; Spanos, V. C.; Flächer, H.; Olive, K. A.; Ellis, J. R.; Buchmueller, O.; Borsato, M.; Fernández, I. Suárez; Dolan, M. J.; Richards, A.; Weiglein, G.; De Roeck, A.; Costa, J.; Citron, M.; Heinemeyer, S.; Santos, D. Martínez

Preprint/Report

PUBDB-2017-11875

Likelihood Analysis of the pMSSM11 in Light of LHC 13-TeV Data

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

2017

[10.3204/PUBDB-2017-11875]

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Please use a persistent id in citations: doi:10.3204/PUBDB-2017-11875

Report No.: CERN-PH-TH-2017-087; DESY-17-059; FTPI-MINN-17-17; IFT-UAM-CSIC-17-035; KCL-PH-TH-2017-22; UMN-TH-3701-17; arXiv:1710.11091

Abstract: We use MasterCode to perform a frequentist analysis of the constraints on a phenomenological MSSM model with 11 parameters, the pMSSM11, including constraints from ~ 36/fb of LHC data at 13 TeV and PICO, XENON1T and PandaX-II searches for dark matter scattering, as well as previous accelerator and astrophysical measurements, presenting fits both with and without the $(g-2)_{\mu}$ constraint. The pMSSM11 is specified by the following parameters: 3 gaugino masses $M_{1,2,3}$, a common mass for the first-and second-generation squarks $m_{\tilde{q}}$ and a distinct third-generation squark mass $m_{\tilde{q}_3}$, a common mass for the first-and second-generation sleptons $m_{\tilde l}$ and a distinct third-generation slepton mass $m_{\tilde \tau}$, a common trilinear mixing parameter $A$, the Higgs mixing parameter $\mu$, the pseudoscalar Higgs mass $M_A$ and $\tan\beta$. In the fit including $(g-2)_{\mu}$, a Bino-like $\tilde\chi^0_1$ is preferred, whereas a Higgsino-like $\tilde \chi^0_1$ is favoured when the $(g-2)_{\mu}$ constraint is dropped. We identify the mechanisms that operate in different regions of the pMSSM11 parameter space to bring the relic density of the lightest neutralino, $\tilde\chi^0_1$, into the range indicated by cosmological data. In the fit including $(g-2)_{\mu}$, coannihilations with $\tilde \chi^0_2$ and the Wino-like $\tilde\chi^{\pm}_1$ or with nearly-degenerate first- and second-generation sleptons are favoured, whereas coannihilations with the $\tilde \chi^0_2$ and the Higgsino-like $\tilde\chi^{\pm}_1$ or with first- and second-generation squarks may be important when the $(g-2)_{\mu}$ constraint is dropped. Prospects remain for discovering strongly-interacting sparticles at the LHC as well as for discovering electroweakly-interacting sparticles at a future linear $e^+ e^-$ collider such as the ILC or CLIC.

Keyword(s): family: 3 ; slepton: mass ; squark: mass ; Higgs particle: mass ; gaugino: mass ; dark matter: scattering ; magnetic moment ; CERN LHC Coll ; sparticle ; mixing ; minimal supersymmetric standard model ; relic density ; pseudoscalar ; accelerator ; frequentist ; neutralino ; CERN CLIC ; ILC Coll