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Major Data Taking Run of RadPhi Experiment: Photonic and Electron Beam Analysis (Summer 2000)

This document summarizes the major data-taking run of the RadPhi experiment conducted in Summer 2000, which focused on analyzing photon and electron beams with energies of 4.3-5.3 GeV and 5.56 GeV, respectively. With an integrated luminosity of 100 pb⁻¹, the experiment produced around 60 million f-mesons, contributing to the invariant mass spectra of 3γ. Further results from VEPP-2M experiments (SND, CMD-2) and DAFNE (KLOE) are discussed, including the analysis of a combined total of 90 million events. Effective field theories and threshold dynamics are also evaluated.

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Major Data Taking Run of RadPhi Experiment: Photonic and Electron Beam Analysis (Summer 2000)

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  1. Radphi experiment Major data-taking run summer 2000 photon beam energy: 4.3-5.3 GeV electron beam energy: 5.56 GeV electron beam current: 80 mA integrated luminosity: 100 pb-1 total f mesons from g,p: 60 M

  2. 2g invariant-mass spectra

  3. 3g invariant-mass spectra Total sample: ~1 M w(782) Total sample: ~20 K f(1020)

  4. Experimental results from VEPP-2M • 2 experiments: • SND • CMD-2 • 2001: • combined total of 90 M events analyzed

  5. continued: results from VEPP-2M = =

  6. Experiment: results from DAFNE • 1 experiment: • KLOE • 2001: • results shown for 50 M events analyzed

  7. continued: results from DAFNE = =

  8. Effective field theory Oset et.al . (2000): + - K K loops Evaluation: threshold dynamics Uses only leading-order XPT interactions q -1 q Unitarization leads to expansion of T instead of T q Coefficients come from fits to 2-pseudoscalar elastic scattering data q Dominant contributions come from imaginary part of Some phases remain ambiguous q

  9. Oset et.al . (2000) Evaluation: threshold dynamics

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