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Search for Baryon-Number Violating ${\mathrm{\Xi}}_{b}^{0}$ Oscillations

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Original languageEnglish
Article numberAaij:2017inn
Pages (from-to)181807
JournalPhysical Review Letters
Issue number18
StatePublished - 3 Nov 2017


A search for baryon-number-violating $\Xi_b^0$ oscillations is performed with a sample of $pp$ collision data recorded by the LHCb experiment, corresponding to an integrated luminosity of 3 fb$^{-1}$. The baryon number at the moment of production is identified by requiring that the $\Xi_b^0$ come from the decay of a resonance $\Xi_b^{*-} \to \Xi_b^0 \pi^-$ or $\Xi_b^{\prime-} \to \Xi_b^0 \pi^-$, and the baryon number at the moment of decay is identified from the final state using the decays $\Xi_b^0 \to \Xi_c^+ \pi^-, ~ \Xi_c^+ \to p K^- \pi^+$. No evidence of baryon number violation is found, and an upper limit at the 95% confidence level is set on the oscillation rate of $\omega <0.08$ ps$^{-1}$, where $\omega$ is the associated angular frequency.

ID: 47616493