Likelihood analysis of the pMSSM11 in light of

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 $\sim 36$ /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 ${(g - 2)}_{μ}$ 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 $m_{\tilde{τ}}$ , a common trilinear mixing parameter A, the Higgs mixing parameter $μ$ , the pseudoscalar Higgs mass $M_{A}$ and $tan β$ . In the fit including ${(g - 2)}_{μ}$ , a Bino-like ${\tilde{χ}}_{1}^{0}$ is preferred, whereas a Higgsino-like ${\tilde{χ}}_{1}^{0}$ is mildly favoured when the ${(g - 2)}_{μ}$ 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, ${\tilde{χ}}_{1}^{0}$ , into the range indicated by cosmological data. In the fit including ${(g - 2)}_{μ}$ , coannihilations with ${\tilde{χ}}_{2}^{0}$ and the Wino-like ${\tilde{χ}}_{1}^{\pm}$ or with nearly-degenerate first- and second-generation sleptons are active, whereas coannihilations with the ${\tilde{χ}}_{2}^{0}$ and the Higgsino-like ${\tilde{χ}}_{1}^{\pm}$ or with first- and second-generation squarks may be important when the ${(g - 2)}_{μ}$ constraint is dropped. In the two cases, we present $χ^{2}$ functions in two-dimensional mass planes as well as their one-dimensional profile projections and best-fit spectra. Prospects remain for discovering strongly-interacting sparticles at the LHC, in both the scenarios with and without the ${(g - 2)}_{μ}$ constraint, as well as for discovering electroweakly-interacting sparticles at a future linear $e^{+} e^{-}$ collider such as the ILC or CLIC.

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Title

Likelihood analysis of the pMSSM11 in light of LHC 13-TeV data

Author

Bagnaschi, E¹

; Sakurai, K²; Borsato, M³; Buchmueller, O⁴; Citron, M⁴; Costa, J C⁴; De Roeck, A⁵; Dolan, M J⁶; Ellis, J R⁷; Flächer, H⁸; Heinemeyer, S⁹; Lucio, M³; D Martínez Santos³; Olive, K A¹⁰; Richards, A⁴; Spanos, V C¹¹; I Suárez Fernández³; Weiglein, G¹

¹ DESY, Hamburg, Germany
² Faculty of Physics, Institute of Theoretical Physics, University of Warsaw, Warsaw, Poland
³ Instituto Galego de Física de Altas Enerxías, Universidade de Santiago de Compostela, Santiago de Compostela, Spain
⁴ High Energy Physics Group, Blackett Laboratory, Imperial College, London, UK
⁵ Experimental Physics Department, CERN, Geneva 23, Switzerland; Antwerp University, Wilrijk, Belgium
⁶ ARC Centre of Excellence for Particle Physics at the Terascale, School of Physics, University of Melbourne, Melbourne, Australia
⁷ Theoretical Particle Physics and Cosmology Group, Department of Physics, King’s College London, London, UK; National Institute of Chemical Physics and Biophysics, Tallinn, Estonia; Theoretical Physics Department, CERN, Geneva 23, Switzerland
⁸ H.H. Wills Physics Laboratory, University of Bristol, Bristol, UK
⁹ Campus of International Excellence UAM+CSIC, Cantoblanco, Madrid, Spain; Instituto de Física Teórica UAM-CSIC, Madrid, Spain; Instituto de Física de Cantabria (CSIC-UC), Santander, Spain
¹⁰ William I. Fine Theoretical Physics Institute, School of Physics and Astronomy, University of Minnesota, Minneapolis, MN, USA
¹¹ Section of Nuclear and Particle Physics, Department of Physics, National and Kapodistrian University of Athens, Athens, Greece

Pages

1-38

Publication year

2018

Publication date

Mar 2018

Publisher

Springer Nature B.V.

ISSN

14346044

e-ISSN

14346052

Source type

Scholarly Journal

Language of publication

English

DOI

https://doi.org/10.1140/epjc/s10052-018-5697-0

ProQuest document ID

2017580199

Likelihood analysis of the pMSSM11 in light of LHC 13-TeV data

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