A search for stable particles heavier than the proton and for Q = −23 quarks produced in e+e− annihilation

doi:10.1016/0370-2693(81)90171-4

Physics Letters B

Volume 101, Issue 6, 28 May 1981, Pages 439-443

https://doi.org/10.1016/0370-2693(81)90171-4 Get rights and content

Abstract

We have searched 1.4 × 10⁶e⁺e⁻ annihilation events for particles with 1–3 GeV/c² mass and charge $Q = − 23$ from the processes e⁺e⁻→q $q$ X and e⁺e⁻ → q $q$ . Upper limits of RQ ∼ 10⁻⁴ for each process are presented which improve the previous limits on free quark production in electromagnetic interactions by 2 orders of magnitude.

References (12)

E. Bellamy
Phys. Rev.
(1968)
R. Galik
Phys. Rev.
(1974)
G.S. LaRue et al.
Phys. Rev. Lett.
(1977)
G.S. LaRue et al.
Phys. Rev. Lett.
(1979)
W.M. Fairbank
G. Bathow
Phys. Lett.
(1967)
J. Foss
Phys. Lett.
(1967)
W. Bartel
Z. Phys.
(1980)

There are more references available in the full text version of this article.

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^☆: This work was supported primarily by the Department of Energy under contracts DE-AC03-76SF00515 and W-7405-ENG-48. Support for individuals came from the listed institutions plus DAAD Bonn and Ecole Polytechnique.

¹: Present address: Vanderbilt University, Nashville, TN 37235, USA.

²: Present address: DESY, Hamburg, Fed. Rep. of Germany.

³: Present address: EP Division, CERN, Geneva, Switzerland.

⁴: Present address: California Institute of Technology, Pasadena, CA 91125, USA.

⁵: Present address: Harvard University, Cambridge, MA 02138, USA.

⁶: Present address: Universität Bonn, Fed. Rep. of Germany.

⁸: Present address: LPNHE Ecole Polytechnique, Palaiseau, France.

⁷: Present address: CEN-Saclay, France.

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Physics Letters B

Abstract

References (12)

Phys. Rev.

Phys. Rev.

Phys. Rev. Lett.

Phys. Rev. Lett.

Phys. Lett.

Phys. Lett.

Z. Phys.

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Search for fractionally charged particles produced in e<sup>+</sup>e<sup>-</sup> annihilation

A search for stable particles heavier than the proton and for Q = −23 quarks produced in e+e− annihilation☆

Abstract

Phys. Rev.

Phys. Rev.

Phys. Rev. Lett.

Phys. Rev. Lett.

Phys. Lett.

Phys. Lett.

Z. Phys.

A search for stable particles heavier than the proton and for $Q = − 23$ quarks produced in e⁺e⁻ annihilation☆