A 15-query CORD-19 study claims hybrid BM25+dense retrieval beats either alone, but the evaluation labels are the hybrid system's own top results, making the comparison self-referential.
Proceedings of the 16th Conference of the European Chapter of the Association for Computational Linguistics , pages =
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SciRet: A Compute-Aware Empirical Study of Retrieval and Reranking for Scientific RAG
A 15-query CORD-19 study claims hybrid BM25+dense retrieval beats either alone, but the evaluation labels are the hybrid system's own top results, making the comparison self-referential.