Are there scientific experiments on shark accidents with humans?
Not really. However, there are statistical/mathematical analyses of known accidents and predictions from them, analogous conclusions from experiments with sharks and humanoid puppets, extrapolations of general information about sharks to accidents, experiments with shark repellents to prevent direct contact with sharks in the water and similar studies.
However, there are no direct and realistic studies of shark accidents involving humans. How could there be? For a scientifically clean experiment, a hypothesis must be established, which is then tested experimentally. How is that possible? In order to achieve statistically significant results, put 100 - 200 people with, for example, different coloured diving suits in the water at different times of the year and day and count how many and which of them are bitten by sharks? At least the author is not aware of any such experiments.