Do you know of any good research articles on capsaicin?

Yes!: Capsaicin is the active component of chili peppers, which are plants belonging to the genus capsicum.While initially making tissue coming in contact have a burning sensation, it eventually relieves pain by expending substance p, from nerves! a good paper:dray a (1992)."mechanism of action of capsaicin-like molecules on sensory neurons". Life sci. 51 (23):1759–65 in a rheumatology-good arthritis rx.