Test of lepton universality in Υ(1S) decays at BABAR
The ratio Rτμ(Υ(1S))=ΓΥ(1S)→τ+τ−/ΓΥ(1S)→μ+μ− is measured using a sample of (121.8±1.2)×106Υ(3S) events recorded by the BABAR detector. This measurement is intended as a test of lepton universality and as a search for a possible light pseudoscalar Higgs boson. In the standard model (SM) this ratio is...
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| Main Authors: | , , , , , , , , |
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| Corporate Author: | |
| Format: | Article (Journal) |
| Language: | English |
| Published: |
14 May 2010
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| In: |
Physical review letters
Year: 2010, Volume: 104, Issue: 19, Pages: 1-7 |
| ISSN: | 1079-7114 |
| DOI: | 10.1103/PhysRevLett.104.191801 |
| Online Access: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevLett.104.191801 Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevLett.104.191801 
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| Author Notes: | BABAR Collaboration |
MARC
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| 245 | 1 | 0 | |a Test of lepton universality in Υ(1S) decays at BABAR |c BABAR Collaboration |
| 246 | 3 | 3 | |a Test of lepton universality in Gamma (1S) decays at BABAR |
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| 500 | |a BABAR Collaboration: P. del Amo Sanchez, A. Adametz, J. Marks, S. Schenk, U. Uwer, T. Hartmann, T. Leddig, H. Schröder, R. Waldi [und viele weitere] | ||
| 500 | |a Gesehen am 23.08.2023 | ||
| 520 | |a The ratio Rτμ(Υ(1S))=ΓΥ(1S)→τ+τ−/ΓΥ(1S)→μ+μ− is measured using a sample of (121.8±1.2)×106Υ(3S) events recorded by the BABAR detector. This measurement is intended as a test of lepton universality and as a search for a possible light pseudoscalar Higgs boson. In the standard model (SM) this ratio is expected to be close to 1. Any significant deviations would violate lepton universality and could be introduced by the coupling to a light pseudoscalar Higgs boson. The analysis studies the decays Υ(3S)→Υ(1S)π+π−, Υ(1S)→l+l−, where l=μ, τ. The result, Rτμ(Υ(1S))=1.005±0.013(stat)±0.022(syst), shows no deviation from the expected SM value, while improving the precision with respect to previous measurements. | ||
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