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The D0 and CDF collaborations recently published two independent analysesthat both claim to represent the observation of the Omega_b particle, a baryonmade up by a (bss) quark combination. Both signals are estimated to exceed thestatistical significance of five standard deviations; however, the massmeasurements derived from the candidates differ by over six standarddeviations, accounting for estimated systematics. Measured rates also appear todiffer, although they remain compatible within the large uncertainties.  In this paper the author recomputes the significance of the D0 result,showing that it was considerably overestimated in the original publication; hethen investigates with a pseudoexperiment-based approach which, among differenthypotheses, appears the most likely cause of the observed discrepancy betweenthe D0 and CDF signals.

Type-I Error or Mass Bias ? An Investigation on the Omega_b Discovery