Are there any scientifically validated practices for Buddhists? We know there are already hundreds of studies with promising results. State of enlightenment is already documented and can be measured.

So I am asking whether exists some resources or even a curriculum of best practices that lead enlightenment and are supported by scientific research.
The Buddha himself advocates the scientific method:


  the teaching realizable in this very life, immediately effective, inviting inspection, relevant, so that sensible people can know it for themselves --SN35.70


The practice of Buddhism is essentially endless lab experiments with reproducible results. The results are subjective and difficult to measure externally. For example, what meter can one buy to measure "tranquility"? A heart rate monitor that measures tranquility as low BPM? Maybe not, since dead people are quite tranquil at 0 BPM.

Because science prefers instrumented measurements over self-reported assessments, a scientist interested in measuring the results of Buddhist practice objectively (i.e., vs. "are you tranquil?") must do so a bit indirectly. For example, there is interest in MRI scans of meditators. 

Although the reliance on instruments is fascinating, it's also a bit more than what is actually needed. If we experience a cessation of suffering, do we really need external instrument validation? And what would convince someone more to try the Noble Eight Fold Path: a scientific paper, or a friend with a clear heart?