From Wikipedia, the free encyclopedia
Hypothetical elementary particle; supersymmetric partner of a gluon
In the
particle physics
theory of
supersymmetry
, a
gluino
(symbol
g͂
) is the hypothetical
supersymmetric partner
of a
gluon
.
In supersymmetric theories, gluinos are
Majorana fermions
and interact via the
strong force
as a color octet.
[1]
Gluinos have a
lepton
number 0,
baryon
number 0, and
spin
1/2.
Experimentally, gluinos have been one of the most promising SUSY particle candidates to be discovered since the production cross-section is the highest among SUSYs in the energy-frontier hadron colliders such as
Tevatron
and the
Large Hadron Collider
(LHC).
[2]
The experimental signatures are typically a pair-produced gluinos and their cascade decays. In models of supersymmetry that conserve
R-parity
, gluinos eventually decay into the undetected lightest super-symmetric particle with many quarks (looking as
jets
) and the standard model
gauge bosons
or Higgs bosons. In the
R-parity
violating scenarios, gluinos can either decay promptly into multiple jets, or be long-lived leaving anomalous sign of "displaced decay vertices" from the interaction point where they are generated.
There has been no sign of gluinos observed so far. The strongest limit has been set by
LHC
(
ATLAS
/
CMS
) where up to minimum 1 TeV and maximum 2 TeV in gluino mass has been excluded.
[3]
[4]
In Popular Culture
[
edit
]
In graphic novel
Watchmen
, chapter 1, page 23,
Dr Manhattan
is about to locating a gluino.