Lmd phi omega

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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

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Second look

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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).
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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).
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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
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missing mass of proton gamma vs missing mass of proton
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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).
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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).
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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).
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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).