# Search for Baryon-Number Violating $\Xi_b^0$ Oscillations

LHCb Collaboration; Bernet, R; Müller, K; Serra, N; Steinkamp, O; Straumann, U; Vollhardt, A; et al (2017). Search for Baryon-Number Violating $\Xi_b^0$ Oscillations. Physical Review Letters, 119(18):181807.

## Abstract

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 $\Xi^{'-}_b \to \Xi_b^0 \pi^−$, and the baryon number at the moment of decay is identified from the final state using the decays $\Xi_b^0 \to \Xi_c^+ \pi^-$, $\Xi_c^+ \to pK^− \pi^+$. 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 ω is the associated angular frequency.

## Abstract

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 $\Xi^{'-}_b \to \Xi_b^0 \pi^−$, and the baryon number at the moment of decay is identified from the final state using the decays $\Xi_b^0 \to \Xi_c^+ \pi^-$, $\Xi_c^+ \to pK^− \pi^+$. 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 ω is the associated angular frequency.

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