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

Journal Article · Sat Mar 24 00:00:00 EDT 2018 · European Physical Journal. C, Particles and Fields

DOI:https://doi.org/10.1140/epjc/s10052-018-5697-0· OSTI ID:1429510

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

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 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 $$\tilde{χ}{0\atop{1}}$$ is preferred, whereas a Higgsino-like $$\tilde{χ}{0\atop{1}}$$ 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, $$\tilde{χ}{0\atop{1}}$$, into the range indicated by cosmological data. In the fit including (g–2)_μ, coannihilations with $$\tilde{χ}{0\atop{2}}$$ and the Wino-like $$\tilde{χ}{±\atop{1}}$$ or with nearly-degenerate first- and second-generation sleptons are active, whereas coannihilations with the $$\tilde{χ}{0\atop{2}}$$ and the Higgsino-like $$\tilde{χ}{±\atop{1}}$$ 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 e⁺e^- collider such as the ILC or CLIC.

• Research Organization: Univ. of Minnesota, Minneapolis, MN (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP)
• Grant/Contract Number: de-sc0011842; FPA2016-78645-P, IFT Centro de Excelencia Severo O; SC0011842
• OSTI ID: 1429510
• Alternate ID(s): OSTI ID: 1510026
• Journal Information: European Physical Journal. C, Particles and Fields, Journal Name: European Physical Journal. C, Particles and Fields Vol. 78 Journal Issue: 3; ISSN 1434-6044
• Publisher: Springer Science + Business Media
• Country of Publication: Germany
• Language: English

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