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New results on the reaction e+e-→μ+μ- at s =29 GeV

Abstract:
We have measured the process e+e-→μ+μ- at s =29 GeV using the High Resolution Spectrometer at SLAC PEP. The forward-backward charge asymmetry is Aμμ=-(4.9±1.5±0.5)% based on 5057 events. A subsample of 3488 μ+μ- events in the angular range cosθ<0.55 gives a cross-section ratio of Rμμ=0.990±0.017±0.030. The resulting couplings of the weak neutral current are gaegaμ=0.208±0.064± 0.021 and gvegvμ=0.027 ±0.051±0.089. The QED cutoff parameters are Λ+>170 GeV and Λ->146 GeV at 95% C.L. © 1985 The American Physical Society.

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Publisher copy:
10.1103/PhysRevD.31.2352

Authors


Derrick, M More by this author
Fernandez, E More by this author
Kooijman, P More by this author
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Journal:
Physical Review D
Volume:
31
Issue:
9
Pages:
2352-2355
Publication date:
1985
DOI:
ISSN:
0556-2821
URN:
uuid:a93b6739-fcde-4070-ab02-a872d051d472
Source identifiers:
345285
Local pid:
pubs:345285
Language:
English

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