Author

Shubham Chatterjee

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Preprint Aug 2026

When Do Anchor-Based Pointwise LLM Rerankers Help? Retriever Quality, Statistical Scope, and Anchor Design

Anchor-based pointwise LLM reranking scores each candidate against a shared reference passage to recover cross-document context at pointwise cost. We study when this actually helps, using GCCP/PAGC as a representative method. Our study is reproduction-first. We use reproduction as a starting point for a controlled comp...

Utshab Kumar Ghosh, Shubham Chatterjee · 0 citations

Preprint Aug 2026

Assessing the Downstream Utility of Evidence-Aware Retrieval in RAG

Retrieval evaluation for retrieval-augmented generation (RAG) is increasingly designed around whether retrieved passages contain evidence that can support generation, rather than topical relevance alone. We study whether this closer alignment with downstream evidence needs also makes retrieval evaluation more useful fo...

Utshab Kumar Ghosh, D. Mukhopadhyay, Shubham Chatterjee · 0 citations

Jul 2026

Bridge Evidence: Static Retrieval Utility Does Not Predict Causal Utility in Multi-Step Agentic Search

Using the Observable Entity Relevance measure from prior work, entities that discriminate relevant from non-relevant candidates appear in the agent's next query 4.02 times more often than entities found only in non-relevant documents.

D. Mukhopadhyay, Utshab Kumar Ghosh, Shubham Chatterjee · arXiv.org · 1 citation