Abstract: The decays Λb 0→ ψ(2S)pK− and Λb 0→ J/ψπ+π−pK−are observed in a data sample corresponding to an integrated luminosity of 3 fb−1, collected in proton-proton collisions at 7 and 8 TeV centre-of-mass energies by the LHCb detector. The ψ(2S) mesons are reconstructed through the decay modes ψ(2S) → μ+μ− and ψ(2S) → J/ψπ+π−. The branching fractions relative to that of Λb 0→ J/ψpK−are measured to beℬ(Λb 0→ψ(2S)pK−)/ℬ(Λb 0→J/ψpK−)=(20.70±0.76±0.46±0.37)×10−2, ℬ(Λb 0→ψ(2S)pK−)/ℬ(Λb 0→J/ψpK−)=(20.86±0.96±1.34)×10−2 where the first uncertainties are statistical, the second are systematic and the third is related to the knowledge of J/ψ and ψ(2S) branching fractions. The mass of the Λb 0baryon is measured to be M(Λb 0)=5619.65±0.17±0.17MeV/c2, where the uncertainties are statistical and systematic. © 2016, The Author(s).

Observation of Λb 0→ ψ(2S)pK−and Λb 0→ J/ψπ+π−pK−decays and a measurement of the Λb 0baryon mass

PALANO, Antimo;PAPPAGALLO, MARCO IGNAZIO;
2016-01-01

Abstract

Abstract: The decays Λb 0→ ψ(2S)pK− and Λb 0→ J/ψπ+π−pK−are observed in a data sample corresponding to an integrated luminosity of 3 fb−1, collected in proton-proton collisions at 7 and 8 TeV centre-of-mass energies by the LHCb detector. The ψ(2S) mesons are reconstructed through the decay modes ψ(2S) → μ+μ− and ψ(2S) → J/ψπ+π−. The branching fractions relative to that of Λb 0→ J/ψpK−are measured to beℬ(Λb 0→ψ(2S)pK−)/ℬ(Λb 0→J/ψpK−)=(20.70±0.76±0.46±0.37)×10−2, ℬ(Λb 0→ψ(2S)pK−)/ℬ(Λb 0→J/ψpK−)=(20.86±0.96±1.34)×10−2 where the first uncertainties are statistical, the second are systematic and the third is related to the knowledge of J/ψ and ψ(2S) branching fractions. The mass of the Λb 0baryon is measured to be M(Λb 0)=5619.65±0.17±0.17MeV/c2, where the uncertainties are statistical and systematic. © 2016, The Author(s).
File in questo prodotto:
Non ci sono file associati a questo prodotto.

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/11586/179540
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 18
  • ???jsp.display-item.citation.isi??? 17
social impact