Test of lepton flavor universality by the measurement of the B0→D[star]-[tau]+ [nu][tau] branching fraction using three-prong [tau] decays
The ratio of branching fractions R(D*−)≡B(B0→D*−τ+ντ)/B(B0→D*−μ+νμ) is measured using a data sample of proton-proton collisions collected with the LHCb detector at center-of-mass energies of 7 and 8 TeV, corresponding to an integrated luminosity of 3 fb−1. The τ lepton is reconstructed with three ch...
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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Corporate Author: | |
| Format: | Article (Journal) |
| Language: | English |
| Published: |
25 April 2018
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| In: |
Physical review
Year: 2018, Volume: 97, Issue: 7 |
| ISSN: | 2470-0029 |
| DOI: | 10.1103/PhysRevD.97.072013 |
| Online Access: | Verlag, Volltext: https://doi.org/10.1103/PhysRevD.97.072013 Verlag, Volltext: https://journals.aps.org/prd/pdf/10.1103/PhysRevD.97.072013 
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| Author Notes: | R. Aaij et al.* (LHCb Collaboration) |
MARC
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| 245 | 1 | 0 | |a Test of lepton flavor universality by the measurement of the B0→D[star]-[tau]+ [nu][tau] branching fraction using three-prong [tau] decays |c R. Aaij et al.* (LHCb Collaboration) |
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| 246 | 3 | 3 | |a Test of lepton flavor universality by the measurement of the B zero → D star minus tau plus nu tau branching fraction using three-prong tau decays |
| 264 | 1 | |c 25 April 2018 | |
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| 500 | |a Im Titel ist das zweite "tau" tiefgestellt | ||
| 500 | |a Im Titel sind null, star, minus und plus hochgestellt | ||
| 500 | |a Im Titel werden star, tau und nu als griechische Buchstaben dargestellt | ||
| 500 | |a R. Aaij, P. d'Argent, S. Bachmann, D. Berninghoff, S. Braun, A. Comerma-Montells, M. De Cian, F. Dordei, M. Dziewiecki, D. Gerick, J.P. Grabowski, X. Han, S. Hansmann-Menzemer, M. Kecke, B. Khanji, M. Kolpin, R. Kopecna, B. Leverington, J. Marks, D.S. Mitzel, S. Neubert, A. Piucci, M. Stahl, S. Stemmle, J. van Tilburg, U. Uwer, A. Zhelezov [und weitere] | ||
| 500 | |a Gesehen am 15.08.2019 | ||
| 520 | |a The ratio of branching fractions R(D*−)≡B(B0→D*−τ+ντ)/B(B0→D*−μ+νμ) is measured using a data sample of proton-proton collisions collected with the LHCb detector at center-of-mass energies of 7 and 8 TeV, corresponding to an integrated luminosity of 3 fb−1. The τ lepton is reconstructed with three charged pions in the final state. A novel method is used that exploits the different vertex topologies of signal and backgrounds to isolate samples of semitauonic decays of b hadrons with high purity. Using the B0→D*−π+π−π+ decay as the normalization channel, the ratio B(B0→D*−τ+ντ)/B(B0→D*−π+π−π+) is measured to be 1.97±0.13±0.18, where the first uncertainty is statistical and the second systematic. An average of branching fraction measurements for the normalization channel is used to derive B(B0→D*−τ+ντ)=(1.42±0.094±0.129±0.054)%, where the third uncertainty is due to the limited knowledge of B(B0→D*−π+π−π+). A test of lepton flavor universality is performed using the well-measured branching fraction B(B0→D*−μ+νμ) to compute R(D*−)=0.291±0.019±0.026±0.013, where the third uncertainty originates from the uncertainties on B(B0→D*−π+π−π+) and B(B0→D*−μ+νμ). This measurement is in agreement with the Standard Model prediction and with previous measurements. | ||
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| 773 | 1 | 8 | |g volume:97 |g year:2018 |g number:7 |g extent:26 |a Test of lepton flavor universality by the measurement of the B0→D[star]-[tau]+ [nu][tau] branching fraction using three-prong [tau] decays |
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