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Physics Letters B 770 (2017) 161–165

Contents lists available at ScienceDirect

Physics Letters B

www.elsevier.com/locate/physletb

Higgsino-like dark matter from sneutrino late decays

Anibal D. Medina

a,b,∗

ARC Centre of Excellence for Particle Physics at the Terascale, School of Physics, The University of Melbourne, Victoria 3010, Australia

Institut de Physique Théorique, Université Paris Saclay, CNRS, CEA, F-91191 Gif-sur-Yvette, France

a r t i c l e i n f o a b s t r a c t

Article history:

Received

3 February 2017

Received

in revised form 3 April 2017

Accepted

13 April 2017

Available

online 26 April 2017

Editor: J.

Hisano

We consider Higgsino-like dark matter (DM) in the Minimal Supersymmetric Standard Model (MSSM)

with additional right-handed neutrino chiral superﬁelds, and propose a new non-thermal way of

generating the right amount of relic DM via sneutrino late decays. Due to the large DM annihilation cross-

section,

decays must occur at lower temperatures than the freeze-out temperature T

 T

F ,

∼ μ/25,

implying a mostly right-handed lightest sneutrino with very small Yukawa interactions. In that context,

the right amount of Higgsino-like DM relic density can be accounted for if sneutrinos are produced via

thermal freeze-in in the early Universe.

(http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP

1. Introduction

Supersymmetry (SUSY) elegantly solves the quadratic ultra-

violet

(UV) sensitivity of the Higgs mass via the introduction of

particles (superpartners) with opposite statistics to each Standard

Model (SM) particle. Stability of the proton naturally leads to the

introduction of R-parity under which all superpartners are odd

while the SM content is even. Thus sparticles can only be created

in pairs at colliders and the lightest supersymmetric particle (LSP)

is stable, providing an interesting dark matter (DM) candidate.

the minimal supersymmetric extension of the SM a natural

and well-studied DM candidate is the lightest neutralino

, a lin-

ear

combination of the wino

W , bino

B and Higgsinos

and

superpartners. Given its weak couplings and for masses of order

the EW scale, the lightest neutralino can provide the well-known

“WIMP miracle” in which the total amount of DM relic density

is naturally obtained. Despite its appealing properties, neutralino

DM in the MSSM is being pushed toward corners of parameter

space, in particular due to the lack of positive signals in direct

detection experiments that probe spin-independent (SI) [1,2] and

spin-dependent (SD) [3] scattering of DM particles off of nuclei

target. Furthermore, the absence of discovery of superpartners at

Large Hadron Collider (LHC) and the discovery of a SM-like Higgs

with a mass m

∼ 126 GeV, seem to point towards a SUSY spec-

Correspondence to: Institut de Physique Théorique, Université Paris Saclay,

CNRS, CEA, F-91191 Gif-sur-Yvette, France.

E-mail

address: anibal.medina@cea.fr.

trum where at least part of the sparticle content have masses in

the TeV range.

Despite

the increasing constraints on the sparticle masses and

composition, a neutralino saturating the DM relic density and of

almost pure Higgsino composition is able to evade current direct

detection bounds due to its suppress coupling to the Higgs and

Z-gauge boson [4], see in particular Fig. 3 of Ref. [4]. Moreover,

if the theory is to remain natural one expects the supersymmet-

ric

Higgs mass parameter μ ≈ O(100) GeV, making a neutralino

LSP with almost pure Higgsino composition m

≈ μ a good can-

didate

for DM. As shown in Ref. [5], for μ < 0 and in the case of

a Higgsino-like neutralino with Bino admixture, there is a destruc-

tive

interference in the diagrams that contribute to DM-nucleon

scattering between the SM-like Higgs and the non-standard Higgs

H such that the latest LUX constraints can be avoided. Studies

have shown that pure thermal Higgsino DM is under-abundant

for masses below 1TeV[6]. This tension served as motivation for

non-thermal ways of generating the right amount of Higgsino relic

density [7,8].

this work we propose an alternative non-thermal way of

generating the right amount of Higgsino DM via late decays of

sneutrinos. As has been well established by now, neutrinos are

massive. A convenient manner of obtaining neutrino masses is

through the addition of right-handed neutrinos to the SM con-

tent,

which by means of heavy Majorana masses leads to the type I

see-saw mechanism of neutrino mass generation. When this extra

content in the SM is supersymmetrized, we ﬁnd that for the light-

est

sneutrino masses m

 μ and small Yukawa couplings Y

the Higgsino-chargino sector, late decays of sneutrinos either di-

rectly

to the lightest neutralino

or cascading to it via decays to

http://dx.doi.org/10.1016/j.physletb.2017.04.054

0370-2693/

SCOAP

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