{"arxiv_id":"hep-ph/0312331","title":"Effective theory approach to unstable particle production","abstract":"Using the hierarchy of scales between the mass, $M$, and the width, $\\Gamma$, of a heavy, unstable particle we construct an effective theory that allows calculations for resonant processes to be systematically expanded in powers of the coupling $\\alpha$ and $\\Gamma/M$. We illustrate the method by computing the next-to-leading order line shape of a scalar resonance in an abelian gauge-Yukawa model.","primary_cat":"hep-ph","cross_cats":[],"submitted_at":"2003-12-23T11:47:50+00:00","latest_version":1,"source":"arxiv","source_label":"arXiv","source_url":null,"has_pdf":true,"has_source":false,"verdict":"CONDITIONAL","confidence":"MODERATE","one_line_summary":"A new effective theory makes resonant production of unstable particles computable as a systematic double expansion in the coupling and the width-to-mass ratio, demonstrated at next-to-leading order for a toy scalar resonance.","novelty_score":7.0,"correctness_risk":"medium","formal_verification":"none","upvotes":0,"downvotes":0,"pith_score":0.0,"inbound_count":26,"_links":{"html":"https://pith.science/paper/hep-ph/0312331","verdict":"/api/v1/verdicts/hep-ph/0312331"}}