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\textit{Superradiance} can trigger the formation of an ultra-light bosoncloud around a spinning black hole. Once formed, the boson cloud is expected toemit a nearly periodic, long-duration, gravitational-wave signal. For bosonmasses in the range $(10^{-13}-10^{-11})$ eV, and stellar mass black holes,such signals are potentially detectable by gravitational wave detectors, likeAdvanced LIGO and Virgo. In this {\it Letter} we present full band upper limitsfor a generic all-sky search for periodic gravitational waves in LIGO O2 data,and use them to derive - for the first time - direct constraints on theultra-light scalar boson field mass.

Direct constraints on ultra-light boson mass from searches for continuous gravitational waves