Test of lepton universality with Λ0b → pK- ℓ+ ℓ- decays
The ratio of branching fractions of the decays Λ0b → pK−e+e− and Λ0b → pK−μ+μ−, R-1pK, is measured for the first time using proton-proton collision data corresponding to an integrated luminosity of 4.7 fb−1 recorded with the LHCb experiment at center-of-mass energies of 7, 8 and 13 TeV. In the dilep...
Gespeichert in:
| Hauptverfasser: | , , , , , , , , , , , , , , , , , , , , , |
|---|---|
| Körperschaft: | |
| Weitere Verfasser: | |
| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
May 11, 2020
|
| In: |
Journal of high energy physics
Year: 2020, Heft: 5, Pages: 1-27 |
| ISSN: | 1029-8479 |
| DOI: | 10.1007/JHEP05(2020)040 |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1007/JHEP05(2020)040 Verlag, lizenzpflichtig, Volltext: https://link.springer.com/article/10.1007%2FJHEP05%282020%29040 |
| Verfasserangaben: | The lHCb collaboration |
| Zusammenfassung: | The ratio of branching fractions of the decays Λ0b → pK−e+e− and Λ0b → pK−μ+μ−, R-1pK, is measured for the first time using proton-proton collision data corresponding to an integrated luminosity of 4.7 fb−1 recorded with the LHCb experiment at center-of-mass energies of 7, 8 and 13 TeV. In the dilepton mass-squared range 0.1 < q2 < 6.0 GeV2/c4 and the pK− mass range m(pK−) < 2600 MeV/c2, the ratio of branching fractions is measured to be R-1pK=1.17+0.18-0.16+- 0.07, where the first uncertainty is statistical and the second systematic. This is the first test of lepton universality with b baryons and the first observation of the decay Λ0b → pK−e+e−. |
|---|---|
| Beschreibung: | Im Titel ist die Zahl "0" hochgestellt, "b" tiefgestellt Im Titel sind "-" und "+" hochgestellt The lHCb collaboration: R. Aaij, F. Archilli, S. Bachmann, D. Berninghoff, M. Borsato, S. Braun, P. d’Argent, M. Dziewiecki, D. Gerick, J. Grabowski, P.A.Günther, X. Han, S. Hansmann-Menzemer, J. Hu, R. Kopecna, B. Leverington, H. Malygina, J. Marks, A. Piucci, N. Skidmore, U. Uwer, L. Witola, A. Zhelezov [und viele weitere] Gesehen am 12.05.2021 |
| Beschreibung: | Online Resource |
| ISSN: | 1029-8479 |
| DOI: | 10.1007/JHEP05(2020)040 |