- Art Gallery -

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

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

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)

References

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.

vte

Particles in physics
Elementary
Fermions
Quarks

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

Leptons

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

Bosons
Gauge

Photon Gluon W and Z bosons

Scalar

Higgs boson

Ghost fields

Faddeev–Popov ghosts

Hypothetical
Superpartners
Gauginos

Gluino Gravitino Photino

Others

Axino Chargino Higgsino Neutralino Sfermion (Stop squark)

Others

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

Composite
Hadrons
Baryons

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

Mesons

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

Others

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

Hypothetical
Baryons

Hexaquark Heptaquark Skyrmion

Mesons

Glueball Theta meson T meson

Others

Mesonic molecule Pomeron Diquark R-hadron

Quasiparticles

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

Lists

Baryons Mesons Particles Quasiparticles Timeline of particle discoveries

Related

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

World

Index

Hellenica World - Scientific Library

Retrieved from "http://en.wikipedia.org/"
All text is available under the terms of the GNU Free Documentation License