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Article overview
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Distinguishing between MSSM and NMSSM through $Delta F=2$ processes | Jacky Kumar
; Michael Paraskevas
; | Date: |
4 Sep 2016 | Abstract: | We study deviations between MSSM and $Z_3$-invariant NMSSM, with respect to
their predictions in $Delta F=2 $ processes. We find that potentially
significant effects arise either from the well known double-penguin diagrams,
due to the extra scalar NMSSM states, or from neutralino-gluino box
contributions, due to the extended neutralino sector. Both are discussed to be
effective in the large $ aneta$ regime. Enhanced genuine-NMSSM contributions
in double penguins are expected for a light singlet spectrum (CP-even,CP-odd),
while the magnitude of box effects is primarily controlled through singlino
mixing. The latter is found to be typically subleading (but non-negligible) for
$lambda lesssim 0.5$, however it can become dominant for $lambdasim
mathcal{O}(1)$. We also study the low $ aneta$ regime, where a distinction
between MSSM and NMSSM can come instead due to experimental constraints, acting
differently on the allowed parameter space of each model. To this end, we
incorporate the LHC Run-I limits from $H
ightarrow Z Z$, $A
ightarrow hZ$
and $H^pm
ightarrow au
u $ non-observation along with Higgs observables
and set (different) upper bounds for new physics contributions in $Delta F=2 $
processes. We find that a $sim 25\%$ contribution in $Delta M_{s(d)}$ is
still possible for MFV models, however such a large effect is nowadays severely
constrained for the case of MSSM, due to stronger bounds on the charged Higgs
masses. | Source: | arXiv, 1608.8794 | Services: | Forum | Review | PDF | Favorites |
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