Using proton–proton collision data corresponding to an integrated luminosity of 140 fb-1 collected by the CMS experiment at sqrt(s) = 13 TeV, the Λb0 → J/ψ Ξ- K+ decay is observed for the first time, with a statistical significance exceeding 5 standard deviations. The relative branching fraction, with respect to the Λb0 → ψ(2S) Λ decay, is measured to be B(Λb0 → J/ψ Ξ- K+)/B(Λb0 → ψ(2S) Λ) = [3.38±1.02±0.61±0.03]%, where the first uncertainty is statistical, the second is systematic, and the third is related to the uncertainties in B(ψ(2S) → J/ψ π+ π-) and B(Ξ- → Λ π-).

Observation of the Lambda_b^0 --> J/psi Xi^- K^+ decay

Tornago, M.;Cappati, A.;Meridiani, P.;Amapane, N.;Argiro, S.;Bellan, R.;Bellora, A.;Costa, M.;Covarelli, R.;Grippo, M.;Kiani, B.;Luongo, F.;Mecca, A.;Migliore, E.;Mulargia, R.;Obertino, M. M.;Pacher, L.;Siviero, F.;Sola, V.;Solano, A.;Soldi, D.;Tarricone, C.;Umoret, G.;Shchelina, K.;Rumerio, P.;Ravera, F.;Salvatico, R.;Vagnerini, A.;
2024-01-01

Abstract

Using proton–proton collision data corresponding to an integrated luminosity of 140 fb-1 collected by the CMS experiment at sqrt(s) = 13 TeV, the Λb0 → J/ψ Ξ- K+ decay is observed for the first time, with a statistical significance exceeding 5 standard deviations. The relative branching fraction, with respect to the Λb0 → ψ(2S) Λ decay, is measured to be B(Λb0 → J/ψ Ξ- K+)/B(Λb0 → ψ(2S) Λ) = [3.38±1.02±0.61±0.03]%, where the first uncertainty is statistical, the second is systematic, and the third is related to the uncertainties in B(ψ(2S) → J/ψ π+ π-) and B(Ξ- → Λ π-).
2024
84
10
1
24
https://link.springer.com/article/10.1140/epjc/s10052-024-13114-9
null, null; Hayrapetyan, A.; Tumasyan, A.; Adam, W.; Andrejkovic, J. W.; Bergauer, T.; Chatterjee, S.; Damanakis, K.; Dragicevic, M.; Valle, A. Escala...espandi
File in questo prodotto:
File Dimensione Formato  
s10052-024-13114-9.pdf

Accesso aperto

Tipo di file: PDF EDITORIALE
Dimensione 2.41 MB
Formato Adobe PDF
2.41 MB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/2078931
Citazioni
  • ???jsp.display-item.citation.pmc??? 0
  • Scopus 8
  • ???jsp.display-item.citation.isi??? 8
social impact