Electroweak superpartners scrutinized at the LHC in events with multi-leptons - INSPIRE

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Electroweak superpartners scrutinized at the LHC in events with multi-leptons

Iñaki Lara
(
- U. Autonoma, Madrid (main) and
- Madrid, IFT
)
,
Daniel E. López-Fogliani
(
- Buenos Aires U. and
- Catolica Argentina U., Buenos Aires
)
,
Carlos Muñoz
(
- U. Autonoma, Madrid (main) and
- Madrid, IFT
)

Oct 29, 2018

8 pages

Published in:

Phys.Lett.B 790 (2019) 176-183

Published: Mar 10, 2019

e-Print:

1810.12455 [hep-ph]

DOI:

10.1016/j.physletb.2019.01.010

View in:

ADS Abstract Service

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Abstract: (Elsevier)

We analyze a multi-lepton signal plus missing transverse energy from neutrinos expected at the LHC for a bino-like neutralino as the lightest supersymmetric particle (LSP), when the left sneutrino is the next-to-LSP and hence a suitable source of binos. The discussion is carried out in the framework of the μν SSM, where the presence of R -parity violating (RPV) couplings involving right-handed neutrinos solves the μ problem and can reproduce simultaneously the neutrino data. Left sneutrinos/sleptons are pair-produced at pp collisions decaying to binos, with the latter decaying via RPV to Wℓ or Zν . This signal can be compared with LHC searches for electroweak superpartners through chargino–neutralino production. The reduced cross section of the sneutrino/slepton production in comparison with the one of the latter process, limits the sensitivity of the searches to small sneutrino/slepton masses. Although the resulting compressed spectrum typically evades the aforementioned searches, we show that analyses using recursive jigsaw reconstruction are sensitive to these scenarios. As a by-product, we find that the region of bino masses 110–120 GeV and sneutrino masses 120–140 GeV can give rise to a tri-lepton signal compatible with the local excess recently reported by ATLAS.

Note:

Discussions expanded, one figure and references added, version published in Phys. Lett. B. 18 pages, 3 figures, 3 tables

Supersymmetry phenomenology
Supersymmetric standard model
LHC phenomenology
new physics
minimal supersymmetric standard model
sneutrino: mass
slepton: mass
bino: mass
neutrino: right-handed
slepton: production

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