Publication

Muon-pair and tau-pair production in two-photon collisions at LEP

2004
Journal Articles

Abstract

The QED processes e+e-→e+e -μ+μ- and e+e -→e+e-τ+τ- are studied with the L3 detector at LEP using an untagged data sample collected at centre-of-mass energies 161 GeV≤√s≤209 GeV. The τ-pairs are observed through the associated decay of one τ into eνν and the other into ππν. The cross sections are measured as a function of √s. For muon pairs, the cross section of the γγ→μ +μ- process is also measured as a function of the two-photon centre-of-mass energy for 3 GeV≤Wγγ≤40 GeV. Good agreement is found between these measurements and the O(α 4) QED expectations. In addition, limits on the anomalous magnetic and electric dipole moments of the τ lepton are extracted. © 2004 Published by Elsevier B.V.

Official source

https://infoscience.epfl.ch/entities/publication/6b4c8ac0-635b-4d99-93c0-a03b09d755f8

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2004
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/6b4c8ac0-635b-4d99-93c0-a03b09d755f8

About this result

Related concepts (32)

Tau (particle)

The tau (τ), also called the tau lepton, tau particle, tauon or tau electron, is an elementary particle similar to the electron, with negative electric charge and a spin of 1/2. Like the electron, the muon, and the three neutrinos, the tau is a lepton, and like all elementary particles with half-integer spin, the tau has a corresponding antiparticle of opposite charge but equal mass and spin. In the tau's case, this is the "antitau" (also called the positive tau). Tau particles are denoted by the symbol _Tau- and the antitaus by _Tau+.

Lepton

In particle physics, a lepton is an elementary particle of half-integer spin (spin ) that does not undergo strong interactions. Two main classes of leptons exist: charged leptons (also known as the electron-like leptons or muons), and neutral leptons (better known as neutrinos). Charged leptons can combine with other particles to form various composite particles such as atoms and positronium, while neutrinos rarely interact with anything, and are consequently rarely observed. The best known of all leptons is the electron.

Muon

A muon (ˈmjuːɒn ; from the Greek letter mu (μ) used to represent it) is an elementary particle similar to the electron, with an electric charge of −1 e and a spin of , but with a much greater mass. It is classified as a lepton. As with other leptons, the muon is not thought to be composed of any simpler particles; that is, it is a fundamental particle. The muon is an unstable subatomic particle with a mean lifetime of 2.2μs, much longer than many other subatomic particles.

Related publications (25)

Muon-pair and tau-pair production in two-photon collisions at LEP

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