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Quark and Lepton Compositeness, Searches for

The latest unpublished results are described in the ``Quark and Lepton Compositeness'' review.

See related review:

Searches for Quark and Lepton Compositeness

SCALE LIMITS for Contact Interactions: $\Lambda\mathrm {({{\mathit e}} {{\mathit e}} {{\mathit e}} {{\mathit e}})}$

$>8.3$ TeV CL=95.0%

SCALE LIMITS for Contact Interactions: $\Lambda\mathrm {({{\mathit e}} {{\mathit e}} {{\mathit \mu}} {{\mathit \mu}})}$

SCALE LIMITS for Contact Interactions: $\Lambda\mathrm {({{\mathit e}} {{\mathit e}} {{\mathit \tau}} {{\mathit \tau}})}$

SCALE LIMITS for Contact Interactions: $\Lambda\mathrm {({{\mathit \ell}} {{\mathit \ell}} {{\mathit \ell}} {{\mathit \ell}})}$

SCALE LIMITS for Contact Interactions: $\Lambda\mathrm {({{\mathit e}} {{\mathit e}} {{\mathit q}} {{\mathit q}})}$

$>24$ TeV CL=95.0%

SCALE LIMITS for Contact Interactions: $\Lambda\mathrm {({{\mathit \mu}} {{\mathit \mu}} {{\mathit q}} {{\mathit q}})}$

SCALE LIMITS for Contact Interactions: $\Lambda\mathrm {({{\mathit \ell}} {{\mathit \nu}} {{\mathit \ell}} {{\mathit \nu}})}$

$>3.10$ TeV CL=90.0%

SCALE LIMITS for Contact Interactions: $\Lambda\mathrm {({{\mathit e}} {{\mathit \nu}} {{\mathit q}} {{\mathit q}})}$

$>2.81$ TeV CL=95.0%

SCALE LIMITS for Contact Interactions: $\Lambda\mathrm {({{\mathit q}} {{\mathit q}} {{\mathit q}} {{\mathit q}})}$

SCALE LIMITS for Contact Interactions: $\Lambda\mathrm {({{\mathit \nu}} {{\mathit \nu}} {{\mathit q}} {{\mathit q}})}$

$>5.0$ TeV CL=95.0%

MASS LIMITS for Excited ${{\mathit e}}$ (${{\mathit e}^{*}}$)

Limits for Excited ${{\mathit e}}$ (${{\mathit e}^{*}}$) from Pair Production

$>103.2$ GeV CL=95.0%

Limits for Excited ${{\mathit e}}$ (${{\mathit e}^{*}}$) from Single Production

$>5.600 \times 10^{3}$ GeV CL=95.0%

Limits for Excited ${{\mathit e}}$ (${{\mathit e}^{*}}$) from ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}$

$>356$ GeV CL=95.0%

Indirect Limits for Excited ${{\mathit e}}$ (${{\mathit e}^{*}}$)

MASS LIMITS for Excited ${{\mathit \mu}}$ (${{\mathit \mu}^{*}}$)

Limits for Excited ${{\mathit \mu}}$ (${{\mathit \mu}^{*}}$) from Pair Production

$>103.2$ GeV CL=95.0%

Limits for Excited ${{\mathit \mu}}$ (${{\mathit \mu}^{*}}$) from Single Production

$>5.700 \times 10^{3}$ GeV CL=95.0%

Indirect Limits for Excited ${{\mathit \mu}}$ (${{\mathit \mu}^{*}}$)

MASS LIMITS for Excited ${{\mathit \tau}}$ (${{\mathit \tau}^{*}}$)

Limits for Excited ${{\mathit \tau}}$ (${{\mathit \tau}^{*}}$) from Pair Production

$>103.2$ GeV CL=95.0%

Limits for Excited ${{\mathit \tau}}$ (${{\mathit \tau}^{*}}$) from Single Production

$>4.600 \times 10^{3}$ GeV CL=95.0%

MASS LIMITS for Excited Neutrino (${{\mathit \nu}^{*}}$)

Limits for Excited ${{\mathit \nu}}$ (${{\mathit \nu}^{*}}$) from Pair Production

$>1.600 \times 10^{3}$ GeV CL=95.0%

Limits for Excited ${{\mathit \nu}}$ (${{\mathit \nu}^{*}}$) from Single Production

$> 213$ GeV CL=95.0%

MASS LIMITS for Excited ${{\mathit q}}$ (${{\mathit q}^{*}}$)

Limits for Excited ${{\mathit q}}$ (${{\mathit q}^{*}}$) from Pair Production

$> 338$ GeV CL=95.0%

Limits for Excited ${{\mathit q}}$ (${{\mathit q}^{*}}$) from Single Production

$> 6700$ GeV CL=95.0%

MASS LIMITS for Color Sextet Quarks (${{\mathit q}_{{{6}}}}$)

$>84$ GeV CL=95.0%

MASS LIMITS for Color Octet Charged Leptons (${{\mathit \ell}_{{{8}}}}$)

$>86$ GeV CL=95.0%

MASS LIMITS for Color Octet Neutrinos (${{\mathit \nu}_{{{8}}}}$)

$>110$ GeV CL=90.0%

MASS LIMITS for ${{\mathit W}_{{{8}}}}$ (Color Octet ${{\mathit W}}$ Boson)

FOOTNOTES

Except where otherwise noted, content of the 2024 Review of Particle Physics is licensed under a Creative Commons Attribution 4.0 International (CC BY 4.0) license. The publication of the Review of Particle Physics is supported by US DOE, MEXT (Japan), INFN (Italy) and CERN. Individual collaborators receive support for their PDG activities from their respective institutes or funding agencies. © 2024. See LBNL disclaimers.