Search for baryon-number-violating ${\Xi }_b^0$ oscillations

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 ${\Xi }_b^{\ast -}\to {\Xi }_b^0{\pi }^{-}$ 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.

arXiv commentAll figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2017-023.html

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