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Update on Rare η Decays

This update discusses the latest developments in rare η decays research led by Liping Gan at the University of North Carolina Wilmington. The focus is on competing experiments at low-energy η production facilities like Jlab, and high-energy scenarios, such as the CBELSA/TAPS at ELSA. Key findings include the proposed measurements of η decays into multiple final states, strategies to filter background noise, and plans for collaboration with theoretical physicists and institutions. The proposal to PAC40 is aimed at enhancing the physics case and establishing promising collaborations, crucial for advancing this research field.

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Update on Rare η Decays

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  1. Update on Rare η Decays Liping Gan University of North Carolina Wilmington

  2. World competition in Rare η Decays Low energy -facilities High energy -facility CBELSA/TAPS at ELSA JEF at Jlab

  3. Filter Background with η Energy Boost Other competitors (CB, KLOE, BES-III, WASA, C-Barrel) : lowenergy η production Jlab: high energy η production (E =9-11.7 GeV) Signal: 0 η →000 • Note: • Statistics is normalized to 1 • beam day. • BG will be further reduced by • requiring only one pair of ’s • to have the 0 invariant mass. S. Prakhov et al.Phy.Rev.,C78,015206 (2008)

  4. Our Plan • Submit a proposal to PAC40 in May 2013. • Work with theorists to strengthen the physics case. • Establish collaborations with Chinese institutes for FCAL-II upgrade. • We are also in process to contact people in the Panda collaboration to establish possible collaboration for the calorimeter development. • Implement PbWO4 crystal in the standard GlueX montecarlo simulation.

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