Evidence for Final State Photons in Multi - Hadronic Decays of the $\Z^0$ - INSPIRE

DataBETA

Evidence for Final State Photons in Multi - Hadronic Decays of the $\Z^0$

OPAL

Collaboration

Apr, 1990

12 pages

Published in:

Phys.Lett.B 246 (1990) 285-296

Published: 1990

DOI:

10.1016/0370-2693(90)91347-E

PDG: MASS LIMITS for

{{\mathit b}^{\,'}}

{}^{\mathit th}

Generation) Quark or Hadron in

{{\mathit e}^{+}}{{\mathit e}^{-}}

Report number:

CERN-EP-90-55

Experiments:

CERN-LEP-OPAL

View in:

CERN Document Server

reference search74 citations

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Abstract: (Elsevier)

From the observed yield and properties of isolated energetic photons in the reaction e + e − →Z 0 →hadrons+ γ measured with the OPAL detector at LEP, evidence for final state radiation from primary quarks is obtained. Combined with the measurement of the total hadronic width of the Z 0 , the observed rate allows the extraction of the electroweak coupling constants of up and down type quarks: ν 1 3 2 + a 1 3 2 = 1.24±0.47 and ν 2 3 2 + a 2 3 2 = 1.72±0.70 No evidence for additional photon production from anomalous decays of the Z 0 or from decays of new particles is found. This measurement limits the contribution to the total Z 0 width from such sources to be less than 8.2 MeV at the 95% confidence level.

electron positron: colliding beams
colliding beams: electron positron
electron positron: annihilation
annihilation: electron positron
Z0: electroproduction
electroproduction: Z0
Z0: nonleptonic decay
nonleptonic decay: Z0
Z0: width
hadron: multiple production

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