Difference between revisions of "Lmd phi omega"
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===What is known=== | ===What is known=== | ||
− | ~700K events of φ from pK+(K-) final state | + | ~700K events of φ from pK+(K-) final state in g11 |
φ decays to K+K- with BR 0.49 | φ decays to K+K- with BR 0.49 | ||
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Assume pK+ acceptance ~10%, total φ produced ~ 7M in pφ exclusive production | 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 | + | 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 η from φ ~30 events | ||
expect ω from φ ~110 | expect ω from φ ~110 | ||
+ | ==First look== | ||
+ | <table> | ||
+ | <tr> | ||
+ | <td>[[File:Mm2vsmmp g11.png|thumb|left|500px]]</td> | ||
+ | </tr> | ||
+ | <tr> | ||
+ | <td>[[File:Missing mass of p with mm2 0.016-0.024.png|thumb|left|500px]]</td> | ||
+ | </tr> | ||
+ | </table> | ||
+ | ==Second look== | ||
+ | <table> | ||
+ | <tr> | ||
+ | <td>[[File:Missing mass of p with mm2 0.016-0.024 and mmpgamma 0.74-0.82.png|thumb|left|500px|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). ]]</td> | ||
+ | </tr> | ||
+ | <tr> | ||
+ | <td>[[File:Missing mass of p with mm2 0.016-0.024 and mmpgamma 0.52-0.58.png|thumb|left|500px|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). ]]</td> | ||
+ | </tr> | ||
+ | <tr> | ||
+ | <td>[[File:Mmpgamma_cut_piz.png|thumb|left|500px|Missing mass of proton gamma]]</td> | ||
+ | </tr> | ||
+ | </table> | ||
+ | ==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 | ||
+ | <table> | ||
+ | <tr> | ||
+ | <td>[[File:Mmpgammavsmmp Cut.png|thumb|left|500px|missing mass of proton gamma vs missing mass of proton ]]</td> | ||
+ | </tr> | ||
+ | <tr> | ||
+ | <td>[[File:Missing mass of p with mm2 0.016-0.024 and mmpgamma 0.74-0.82 Cut.png|thumb|left|500px|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). ]]</td> | ||
+ | <td>[[File:Missing mass of p with mm2 0.016-0.024 and mmpgamma 0.74-0.82 Cut Side-band-subtraction.png|thumb|left|500px|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). ]]</td> | ||
+ | </tr> | ||
+ | <tr> | ||
+ | <td>[[File:Missing mass of p with mm2 0.016-0.024 and mmpgamma 0.52-0.58 Cut.png|thumb|left|500px|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). ]]</td> | ||
+ | <td>[[File:Missing mass of p with mm2 0.016-0.024 and mmpgamma 0.52-0.58 Cut Side-band-subtraction.png|thumb|left|500px|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). ]]</td> | ||
+ | |||
+ | </tr> | ||
+ | |||
+ | </table> |
Latest revision as of 13:00, 27 May 2014
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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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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