Searching for left sneutrino LSP at the LHC

We analyze relevant signals expected at the LHC for a left sneutrino as the lightest supersymmetric particle (LSP). The discussion is carried out in the “μ from ν” supersymmetric standard model (μνSSM), where the presence of R-parity breaking couplings involving right-handed neutrinos solves the μ problem and reproduces neutrino data. The sneutrinos are pair produced via a virtual W, Z or γ in the s channel. From the prompt decay of a pair of left sneutrinos LSPs of any family, a significant diphoton signal plus missing transverse energy (MET) from neutrinos can be present in the mass range 118–132 GeV, with 13 TeV center-of-mass energy and an integrated luminosity of 100 fb−1. In addition, in the case of a pair of tau left sneutrinos LSPs, given the large value of the tau Yukawa coupling diphoton plus leptons and/or multileptons can appear. We find that the number of expected events for the multilepton signal, together with properly adopted search strategies, is sufficient to give a significant evidence for a sneutrino of mass in the range 130–310 GeV, even with the integrated luminosity of 20 fb−1. In the case of the signal producing diphoton plus leptons, an integrated luminosity of 100 fb−1 is needed to give a significant evidence in the mass range 95–145 GeV. Finally, we discuss briefly the presence of displaced vertices and the associated range of masses.

Note:

Version published in IJMPA. 54 pages, 8 figures, 14 tables

12.60.Jv
14.80.Ly
Supersymmetry phenomenology
supersymmetric Standard Model
sneutrino: mass
sneutrino: LSP
neutrino: right-handed
standard model: supersymmetry
coupling: Yukawa
transverse energy: missing-energy

References(121)

Figures(34)

[1]

Proposal for a Supersymmetric Standard Model

D.E. Lopez-Fogliani
(
- Madrid, Autonoma U.
)
,
C. Munoz
(
- Madrid, Autonoma U. and
- KAIST, Taejon
)

- Phys.Rev.Lett. 97 (2006) 041801
•
e-Print:
- hep-ph/0508297
•
DOI:
- 10.1103/PhysRevLett.97.041801

[2]

Analysis of the parameter space and spectrum of the mu nu SSM

Nicolas Escudero
(
- Madrid, Autonoma U. and
- Madrid, IFT
)
,
Daniel E. Lopez-Fogliani
(
- Sheffield U.
)
,
Carlos Munoz
(
- Madrid, Autonoma U. and
- Madrid, IFT
)
,
Roberto Ruiz de Austri
(
- Madrid, Autonoma U. and
- Madrid, IFT
)

- JHEP 12 (2008) 099
•
e-Print:
- 0810.1507
•
DOI:
- 10.1088/1126-6708/2008/12/099

[3]

Phenomenology of a New Supersymmetric Standard Model: The mu nu SSM

Carlos Munoz
(
- Madrid, Autonoma U. and
- Madrid, IFT
)

- AIP Conf.Proc. 1200 (2010) 1, 413-416
•
e-Print:
- 0909.5140
•
DOI:
- 10.1063/1.3327603

[4]

Searching for SUSY and decaying gravitino dark matter at the LHC and Fermi-LAT with the $\mu\nu$ SSM

Carlos Muñoz
(
- Madrid, IFT and
- Madrid, Autonoma U.
)

- PoS DSU2015 (2016) 034
•
e-Print:
- 1608.07912
•
DOI:
- 10.22323/1.268.0034

[5]

A Supersymmetry primer

Stephen P. Martin
(
- Northern Illinois U. and
- Fermilab
)

- ,
- Adv.Ser.Direct.High Energy Phys. 21 (2010) 1-153,
- Adv.Ser.Direct.High Energy Phys. 18 (1998) 1-98
•
e-Print:
- hep-ph/9709356
•
DOI:
- 10.1142/9789812839657_0001