From Wikipedia, the free encyclopedia
Bosonic superpartner of a fermion
In
supersymmetric
extension to the
Standard Model
(SM) of
physics
, a
sfermion
is a hypothetical
spin
-0
superpartner particle
(sparticle) of its associated
fermion
.
[1]
[2]
Each particle has a superpartner with spin that differs by
1
/
2
. Fermions in the SM have
spin-
1
/
2
and, therefore, sfermions have spin 0.
[3]
[4]
The name 'sfermion' was formed by the general rule of prefixing an 's' to the name of its superpartner, denoting that it is a
scalar particle
with spin 0. For instance, the
electron
's superpartner is the
selectron
and the
top quark
's superpartner is the
stop squark
.
One corollary from supersymmetry is that sparticles have the same
gauge numbers
as their SM partners. This means that sparticle–particle pairs have the same
color charge
,
weak isospin
charge, and
hypercharge
(and consequently
electric charge
). Unbroken supersymmetry also implies that sparticle–particle pairs have the same mass. This is evidently not the case, since these sparticles would have already been detected. Thus, sparticles must have different masses from the particle partners and supersymmetry is said to be broken.
[5]
[6]
Fundamental sfermions
[
edit
]
Squarks
[
edit
]
Squarks
(also quarkinos)
[7]
are the superpartners of
quarks
. These include the sup squark, sdown squark, scharm squark, sstrange squark,
stop squark
, and sbottom squark.
Squarks
Squark
|
Symbol
|
Associated quark
|
Symbol
|
First generation
|
Sup squark
|
|
Up quark
|
|
Sdown squark
|
|
Down quark
|
|
Second generation
|
Scharm squark
|
|
Charm quark
|
|
Sstrange squark
|
|
Strange quark
|
|
Third generation
|
Stop squark
|
|
Top quark
|
|
Sbottom squark
|
|
Bottom quark
|
|
Sleptons
[
edit
]
Sleptons
are the superpartners of
leptons
. These include the selectron, smuon, stau, and their corresponding sneutrino flavors.
[8]
Sleptons
Slepton
|
Symbol
|
Associated lepton
|
Symbol
|
First generation
|
Selectron
|
|
Electron
|
|
Selectron sneutrino
|
|
Electron neutrino
|
|
Second generation
|
Smuon
|
|
Muon
|
|
Smuon sneutrino
|
|
Muon neutrino
|
|
Third generation
|
Stau
|
|
Tau
|
|
Stau sneutrino
|
|
Tau neutrino
|
|
See also
[
edit
]
References
[
edit
]
- ^
He-sheng, Chen; Dongsheng, Du; Weiguo, Li (2005).
High Energy Physics: Ichep 2004 - Proceedings Of The 32nd International Conference (In 2 Volumes)
. World Scientific. p. 109.
ISBN
9789814481274
. Retrieved
30 September
2019
.
- ^
Masayuki, Nakahata; Y, Itow; Masato, Shiozawa (2004).
Neutrino Oscillations And Their Origin, Proceedings Of The 4th International Workshop
. World Scientific.
ISBN
9789814485586
. Retrieved
30 September
2019
.
- ^
Baer, Howard; Tata, Xerxes (2006).
Weak Scale Supersymmetry: From Superfields to Scattering Events
. Cambridge University Press. p. 129.
ISBN
9781139455077
. Retrieved
30 September
2019
.
- ^
Cline, David B (1997).
Flavor-changing Neutral Currents: Present And Future Studies: Proceedings Of The Symposium
. World Scientific. p. 229.
ISBN
9789814545822
. Retrieved
30 September
2019
.
- ^
Seamus, Hegarty; Keith, Potter; Emanuele, Quercigh (1992).
Joint International Lepton-photon Symposium And Europhysics Conference On High Energy Physics - Lp-hep '91 (In 2 Volumes)
. World Scientific. p. 500.
ISBN
9789814555531
. Retrieved
30 September
2019
.
- ^
Khalil, Shaaban; Moretti, Stefano (2017).
Supersymmetry Beyond Minimality: From Theory to Experiment
. CRC Press.
ISBN
9781315350875
. Retrieved
30 September
2019
.
- ^
Khlopov, Maxim Yu. (1999).
Cosmoparticle Physics
. World Scientific. p. 53.
ISBN
978-981-02-3188-0
. Retrieved
23 June
2020
.
- ^
Masayuki, Nakahata; Y, Itow; Masato, Shiozawa (2004).
Neutrino Oscillations And Their Origin, Proceedings Of The 4th International Workshop
. World Scientific. p. 442.
ISBN
9789814485586
. Retrieved
30 September
2019
.