First evidence for direct CP violation in beauty to charmonium decays
The 𝐶𝑃 asymmetry and branching fraction of the Cabibbo-Kobayashi-Maskawa-suppressed decay 𝐵+ →𝐽/𝜓𝜋+ are precisely measured relative to the favored decay 𝐵+ →𝐽/𝜓𝐾+ using a sample of proton-proton collision data corresponding to an integrated luminosity of 5.4 fb−1 recorded at a center-of-mass ener...
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| Hauptverfasser: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
12 March, 2025
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| In: |
Physical review letters
Year: 2025, Jahrgang: 134, Heft: 10, Pages: 1-13 |
| ISSN: | 1079-7114 |
| DOI: | 10.1103/PhysRevLett.134.101801 |
| Online-Zugang: | Verlag, kostenfrei, Volltext: https://doi.org/10.1103/PhysRevLett.134.101801 Verlag, kostenfrei, Volltext: https://link.aps.org/doi/10.1103/PhysRevLett.134.101801 |
| Verfasserangaben: | R. Aaij et al.* (LHCb Collaboration) |
MARC
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| 245 | 1 | 0 | |a First evidence for direct CP violation in beauty to charmonium decays |c R. Aaij et al.* (LHCb Collaboration) |
| 264 | 1 | |c 12 March, 2025 | |
| 300 | |b Diagramme | ||
| 300 | |a 13 | ||
| 336 | |a Text |b txt |2 rdacontent | ||
| 337 | |a Computermedien |b c |2 rdamedia | ||
| 338 | |a Online-Ressource |b cr |2 rdacarrier | ||
| 500 | |a LHCb Collaboration: R. Aaij, S. Bachmann, L. Carus, R. Caspary, S. Celani, C. Cocha Toapaxi, M. De Cian, L. Dittmann, S. Esen, F.C. Glaser, P.A. Günther, X. Han, S. Hansmann-Menzemer, P. Herrero Gascón, C. Langenbruch, B. Leverington, J. Marks, M.P. Morgenthaler, S.R. Roy, M. Ruiz Diaz, M.D. Tat, G. Tuci, L.H. Uecker, D.J. Unverzagt, U. Uwer, C. Wang, L. Witola, Y. Zhao, A. Zhelezov [und viele weitere] | ||
| 500 | |a Gesehen am 08.01.2026 | ||
| 520 | |a The asymmetry and branching fraction of the Cabibbo-Kobayashi-Maskawa-suppressed decay + →/+ are precisely measured relative to the favored decay + →/+ using a sample of proton-proton collision data corresponding to an integrated luminosity of 5.4 fb−1 recorded at a center-of-mass energy of 13 TeV during 2016-2018. The results of the asymmetry difference and branching fraction ratio are Δ≡(+→/+)−(+→/+)=(1.29±0.49±0.08)×10−2, ℛ/≡[ℬ(+→/+)/ℬ(+→/+)]=(3.852±0.022±0.018)×10−2, where the first uncertainties are statistical and the second are systematic. A combination with previous LHCb results based on data collected at 7 and 8 TeV in 2011 and 2012 yields Δ =(1.42 ±0.43 ±0.08) ×10−2 and ℛ/ =(3.846 ±0.018 ±0.018) ×10−2. The combined Δ value deviates from zero by 3.2 standard deviations, providing the first evidence for direct violation in the amplitudes of beauty decays to charmonium final states. | ||
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