https://doi.org/10.1140/epjc/s10052-019-7412-1
Regular Article - Theoretical Physics
Sampling the 
SSM for displaced decays of the tau left sneutrino LSP at the LHC
1
Departamento de Física Teórica, Universidad Autónoma de Madrid (UAM), Campus de Cantoblanco, 28049, Madrid, Spain
2
Instituto de Física Teórica (IFT) UAM-CSIC, Campus de Cantoblanco, 28049, Madrid, Spain
3
Departamento de Física, Facultad de Ciencia Exactas y Naturales, Instituto de Física de Buenos Aires UBA & CONICET, Universidad de Buenos Aires, 1428, Buenos Aires, Argentina
4
Pontificia Universidad Católica Argentina, 1107, Buenos Aires, Argentina
5
Department of Physics, University of Tokyo, Tokyo, 113-0033, Japan
6
Research Center for Advanced Particle Physics, Kyushu University, Fukuoka, 819-0395, Japan
7
Instituto de Física Corpuscular CSIC-UV, c/Catedrático José Beltrán 2, 46980, Paterna, Valencia, Spain
8
Center for Theoretical Physics of the Universe, Institute for Basic Science (IBS), Daejeon, 34126, Korea
* e-mail: c.munoz@uam.es
Received:
13
July
2019
Accepted:
19
October
2019
Published online:
16
November
2019
Within the framework of the 
, a displaced dilepton signal is expected at the LHC from the decay of a tau left sneutrino as the lightest supersymmetric particle (LSP) with a mass in the range 45–100 GeV. We compare the predictions of this scenario with the ATLAS search for long-lived particles using displaced lepton pairs in pp collisions, considering an optimization of the trigger requirements by means of a high level trigger that exploits tracker information. The analysis is carried out in the general case of three families of right-handed neutrino superfields, where all the neutrinos get contributions to their masses at tree level. To analyze the parameter space, we sample the SSM for a tau left sneutrino LSP with proper decay length 
using a likelihood data-driven method, and paying special attention to reproduce the current experimental data on neutrino and Higgs physics, as well as flavor observables. The sneutrino is special in the since its couplings have to be chosen so that the neutrino oscillation data are reproduced. We find that important regions of the parameter space can be probed at the LHC run 3.
© The Author(s), 2019
