Estimate
What is known
~700K events of φ from pK+(K-) final state in g11
φ decays to K+K- with BR 0.49
φ decays to γη with BR 0.013
φ decays to γω < 5%
Feasibility
Assume pK+ acceptance ~10%, total φ produced ~ 7M in pφ exclusive production
set the final state particles are pγπ+π- and the acceptance is ~0.0003 with assumption that charged particle ~30% acceptance and photon ~10%
expect η from φ ~30 events
expect ω from φ ~110
First look
Error creating thumbnail: File missing |
Error creating thumbnail: File missing |
Second look
Error creating thumbnail: File missing Missing mass of proton after selecting missing mass square between [0.016,0.024] (pi0) and missing mass of proton gamma between [0.74,0.82] (ω). |
Error creating thumbnail: File missing Missing mass of proton after selecting missing mass square between [0.016,0.024] (pi0) and missing mass of proton gamma between [0.52,0.58] (η). |
Error creating thumbnail: File missing Missing mass of proton gamma |
Third look
Additional cut applied:
- Beta of photon > 0.8
- In each event, only one photon is counted (missing mass closest to pi0)
- pi0 mass is assumed with PDG value in calculation
Error creating thumbnail: File missing missing mass of proton gamma vs missing mass of proton |
Error creating thumbnail: File missing Missing mass of proton after selecting missing mass square between [0.016,0.024] (pi0) and missing mass of proton gamma between [0.74,0.82] (ω). |
Error creating thumbnail: File missing side-band of omega subtracted missing mass of proton after selecting missing mass square between [0.016,0.024] (pi0) and missing mass of proton gamma between [0.74,0.82] (ω). |
Error creating thumbnail: File missing Missing mass of proton after selecting missing mass square between [0.016,0.024] (pi0) and missing mass of proton gamma between [0.52,0.58] (η). |
Error creating thumbnail: File missing side-band of eta subtracted missing mass of proton after selecting missing mass square between [0.016,0.024] (pi0) and missing mass of proton gamma between [0.52,0.58] (η). |
