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In supersymmetric extension to the Standard Model 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

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 \( {\tilde {u}} \) Up quark u
Sdown squark \( {\tilde {d}} \) Down quark d
Second generation
Scharm squark \( {\tilde {c}} \) Charm quark c
Sstrange squark \( {\tilde {s}} \) Strange quark s
Third generation
Stop squark \( {\tilde {t}} \) Top quark t
Sbottom squark \( {\tilde {b}} \) Bottom quark b

Sleptons are the superpartners of leptons. These include the selectron, smuon, stau, and the sneutrinos.[8]
Sleptons Slepton Symbol Associated lepton Symbol
First generation
Selectron \( {\tilde {e}} \) Electron e
Selectron sneutrino \( {\tilde {\nu }}_{e} \) Electron neutrino \( \nu _{e} \)
Second generation
Smuon \( {\tilde {\mu }} \) Muon {\displaystyle \mu } \mu \)
Smuon sneutrino \( {\tilde {\nu }}_{\mu } \) Muon neutrino \( \nu _{\mu } \)
Third generation
Stau \( {\tilde {\tau }} \) Tau \( \tau \)
Stau sneutrino \( {\tilde {\nu }}_{\tau } \) Tau neutrino \( \nu _{\tau } \)
See also

Minimal Supersymmetric Standard Model (MSSM)


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.

Martin, Stephen, P. (2011). "A Supersymmetry Primer". Advanced Series on Directions in High Energy Physics. 18: 1–98. arXiv:hep-ph/9709356. doi:10.1142/9789812839657_0001. ISBN 978-981-02-3553-6. S2CID 118973381.


Particles in physics

Up (quark antiquark) Down (quark antiquark) Charm (quark antiquark) Strange (quark antiquark) Top (quark antiquark) Bottom (quark antiquark)


Electron Positron Muon Antimuon Tau Antitau Electron neutrino Electron antineutrino Muon neutrino Muon antineutrino Tau neutrino Tau antineutrino


Photon Gluon W and Z bosons


Higgs boson

Ghost fields

Faddeev–Popov ghosts


Gluino Gravitino Photino


Axino Chargino Higgsino Neutralino Sfermion (Stop squark)


Axion Curvaton Dilaton Dual graviton Graviphoton Graviton Inflaton Leptoquark Magnetic monopole Majoron Majorana fermion Dark photon Planck particle Preon Sterile neutrino Tachyon W′ and Z′ bosons X and Y bosons


Proton Antiproton Neutron Antineutron Delta baryon Lambda baryon Sigma baryon Xi baryon Omega baryon


Pion Rho meson Eta and eta prime mesons Phi meson J/psi meson Omega meson Upsilon meson Kaon B meson D meson Quarkonium

Exotic hadrons

Tetraquark Pentaquark


Atomic nuclei Atoms Exotic atoms
Positronium Muonium Tauonium Onia Pionium Superatoms Molecules


Hexaquark Heptaquark Skyrmion


Glueball Theta meson T meson


Mesonic molecule Pomeron Diquark R-hadron


Anyon Davydov soliton Dropleton Exciton Hole Magnon Phonon Plasmaron Plasmon Polariton Polaron Roton Trion


Baryons Mesons Particles Quasiparticles Timeline of particle discoveries


History of subatomic physics
timeline Standard Model
mathematical formulation Subatomic particles Particles Antiparticles Nuclear physics Eightfold way
Quark model Exotic matter Massless particle Relativistic particle Virtual particle Wave–particle duality Particle chauvinism

Wikipedia books

Hadronic Matter Particles of the Standard Model Leptons Quarks

Physics Encyclopedia



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