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

Research output: Contribution to journalArticle

  • E. Bagnaschi
  • K. Sakurai
  • M. Borsato
  • O. Buchmueller
  • M. Citron
  • J. C. Costa
  • A. De Roeck
  • M. J. Dolan
  • J. R. Ellis
  • H. Flächerhttp://orcid.org/0000-0002-5371-941X
  • S. Heinemeyer
  • M. Lucio
  • D. Martínez Santos
  • K. A. Olive
  • A. Richards
  • V. C. Spanos
  • I. Suárez Fernández
  • G. Weiglein
Original languageEnglish
Article number256
Number of pages38
JournalEuropean Physical Journal C: Particles and Fields
Volume78
Issue number3
Early online date24 Mar 2018
DOIs
DateAccepted/In press - 3 Mar 2018
DateE-pub ahead of print - 24 Mar 2018
DatePublished (current) - 24 Mar 2018

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) μ constraint. The pMSSM11 is specified by the following parameters: 3 gaugino masses M1 , 2 , 3, a common mass for the first-and second-generation squarks mq~ and a distinct third-generation squark mass mq~3, a common mass for the first-and second-generation sleptons mℓ~ and a distinct third-generation slepton mass mτ~, a common trilinear mixing parameter A, the Higgs mixing parameter μ, the pseudoscalar Higgs mass MA and tan β. In the fit including (g- 2) μ, a Bino-like χ~10 is preferred, whereas a Higgsino-like χ~10 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, χ~10, into the range indicated by cosmological data. In the fit including (g- 2) μ, coannihilations with χ~20 and the Wino-like χ~1± or with nearly-degenerate first- and second-generation sleptons are active, whereas coannihilations with the χ~20 and the Higgsino-like χ~1± or with first- and second-generation squarks may be important when the (g- 2) μ constraint is dropped. In the two cases, we present χ2 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.

Additional information

48 pages, 24 figures, 65 plots, 6 tables; version published on EPJC

    Research areas

  • hep-ph, astro-ph.HE, hep-ex

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    Rights statement: This is the final published version of the article (version of record). It first appeared online via Springer at https://doi.org/10.1140/epjc/s10052-018-5697-0 . Please refer to any applicable terms of use of the publisher.

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