Journal article
Measurement of the branching fraction of D + → τ + ν τ
- Abstract:
- By analyzing e+e− collision data with an integrated luminosity of 7.9 fb−1 collected with the BESIII detector at the center-of-mass energy of 3.773 GeV, the branching fraction of D+→ τ+ντ is determined as B = (9.9 ± 1.1stat± 0.5syst) × 10−4. Using the most precise result B(D+→ μ+νμ) = (3.981 ± 0.079stat± 0.040syst) × 10−4 [1], we determine Rτ/μ = Γ(D+ → τ+ντ)/Γ(D+ → μ+νμ) = 2.49 ± 0.31, achieving a factor of two improvement in precision compared to the previous BESIII result. This measurement is in agreement with the standard model prediction of lepton flavor universality within one standard deviation.
- Publication status:
- Published
- Peer review status:
- Peer reviewed
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(Preview, Version of record, pdf, 551.3KB, Terms of use)
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- Publisher copy:
- 10.1007/jhep01(2025)089
Authors
- Publisher:
- Springer
- Journal:
- Journal of High Energy Physics More from this journal
- Volume:
- 2025
- Issue:
- 1
- Article number:
- 89
- Publication date:
- 2025-01-17
- Acceptance date:
- 2024-12-21
- DOI:
- EISSN:
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1029-8479
- ISSN:
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1126-6708
- Language:
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English
- Keywords:
- Source identifiers:
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2651470
- Deposit date:
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2025-02-03
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