Observation of the Decay Λ0b→Λ+cτ−ν[bar]τ
The first observation of the semileptonic b-baryon decay Λ0b→Λ+cτ−¯ντ, with a significance of 6.1σ, is reported using a data sample corresponding to 3 fb−1 of integrated luminosity, collected by the LHCb experiment at center-of-mass energies of 7 and 8 TeV at the LHC. The τ− lepton is reconstructed...
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
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13 May 2022
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| In: |
Physical review letters
Year: 2022, Jahrgang: 128, Heft: 19, Pages: 1-11 |
| ISSN: | 1079-7114 |
| DOI: | 10.1103/PhysRevLett.128.191803 |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevLett.128.191803 Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevLett.128.191803 
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| Verfasserangaben: | R. Aaij et al. (LHCb Collaboration) |
MARC
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| 245 | 1 | 0 | |a Observation of the Decay Λ0b→Λ+cτ−ν[bar]τ |c R. Aaij et al. (LHCb Collaboration) |
| 246 | 3 | 3 | |a Observation of the decay Lambda 0 b → Lambda + c tau − nu [bar] tau |
| 264 | 1 | |c 13 May 2022 | |
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| 337 | |a Computermedien |b c |2 rdamedia | ||
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| 500 | |a Im Titel sind die Buchstaben b und c tiefgestellt | ||
| 500 | |a Im Titel sind die Zahl 0 und die Zeichen + und - hochgestellt | ||
| 500 | |a Im Titel steht "nu" mit einem Oberstrich | ||
| 500 | |a LHCb Collaboration: R. Aaij, F. Archilli, S. Bachmann, D. Berninghoff, M. Borsato, R. Caspary, G. Frau, D. Gerick, J.P. Grabowski, P.A. Günther, X. Han, S. Hansmann-Menzemer, J. Hu, R. Kepcna, B. Leverington, P. Li, H. Malygina, J. Marks, D.J. Unverzagt, U. Uwer, C. Wang, L. Witola, A. Zhelezov [und 985 weitere Personen] | ||
| 500 | |a Gesehen am 21.07.2022 | ||
| 520 | |a The first observation of the semileptonic b-baryon decay Λ0b→Λ+cτ−¯ντ, with a significance of 6.1σ, is reported using a data sample corresponding to 3 fb−1 of integrated luminosity, collected by the LHCb experiment at center-of-mass energies of 7 and 8 TeV at the LHC. The τ− lepton is reconstructed in the hadronic decay to three charged pions. The ratio K=B(Λ0b→Λ+cτ−¯ντ)/B(Λ0b→Λ+cπ−π+π−) is measured to be 2.46±0.27±0.40, where the first uncertainty is statistical and the second systematic. The branching fraction B(Λ0b→Λ+cτ−¯ντ)=(1.50±0.16±0.25±0.23)% is obtained, where the third uncertainty is from the external branching fraction of the normalization channel Λ0b→Λ+cπ−π+π−. The ratio of semileptonic branching fractions R(Λ+c)≡B(Λ0b→Λ+cτ−¯ντ)/B(Λ0b→Λ+cμ−¯νμ) is derived to be 0.242±0.026±0.040±0.059, where the external branching fraction uncertainty from the channel Λ0b→Λ+cμ−¯νμ contributes to the last term. This result is in agreement with the standard model prediction. | ||
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