Webis at TREC 2020: Health Misinformation Track Extended Abstract

We give a brief overview of the Webis group’s participation in the TREC 2020 Health Misinformation track. e baseline retrieval results of our search engine ChatNoir (BM25F-based) are re-ranked in two di erent approaches: (1) axiomatically re-ranking the top-20 initial results for argumentative topics / queries, and (2) formulating keyqueries to retrieve relevant documents at the top ranks. Our axiomatic re-ranking uses three axioms that capture argumentativeness, while for the keyqueries approach, we use low-e ort manual pilot judgments to identify several relevant documents per topic.