Difference between revisions of "JEF meeting Jan 26, 2015"
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# Task list updates? | # Task list updates? | ||
# [https://cnidlamp.jlab.org/RareEtaDecay/JDocDB/node/55 Update on pi+pi- studies] (Dave M.) | # [https://cnidlamp.jlab.org/RareEtaDecay/JDocDB/node/55 Update on pi+pi- studies] (Dave M.) | ||
+ | |||
+ | =Minutes= | ||
+ | Attendees: Liping Gan, Dave Mack, Sascha Somov, Justin Stevens, Simon Taylor | ||
+ | |||
+ | * Dave Mack presented comparisons between a toy MC for the reaction γ p → p ρ, ρ→π+π-; (and continuum π+π- events) and histograms created by Justin Stevens from the Fall Commissioning Run data | ||
+ | ** The recoil proton was not reconstructed. A proton band is seen in missing mass: Dave's toy MC mimics the behaviour of the data well for signal events where the correct photon in the tagger is measured. | ||
+ | ** Inclusion of continuum π+π- accounts for the grass above and below the rho peak for missing mass consistent with a proton. | ||
+ | ** The data is dominated by a large bump at low two-pi mass and high missing mass | ||
+ | *** ρ events from photons below the range of the tagger can only account for some of this enhancement | ||
+ | *** Dave can account for most of the enhancement by adding continuum 2-pion events; JS pointed out that multi-prong events (5 pions, etc) could account for some of this as well. | ||
+ | ** Cutting on the energy of the 2-pion pair cleans up the data considerably. |
Latest revision as of 18:01, 27 January 2015
Meeting time and location= 13:30 EST (JLab time) CC F326-327
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Agenda
- Task list updates?
- Update on pi+pi- studies (Dave M.)
Minutes
Attendees: Liping Gan, Dave Mack, Sascha Somov, Justin Stevens, Simon Taylor
- Dave Mack presented comparisons between a toy MC for the reaction γ p → p ρ, ρ→π+π-; (and continuum π+π- events) and histograms created by Justin Stevens from the Fall Commissioning Run data
- The recoil proton was not reconstructed. A proton band is seen in missing mass: Dave's toy MC mimics the behaviour of the data well for signal events where the correct photon in the tagger is measured.
- Inclusion of continuum π+π- accounts for the grass above and below the rho peak for missing mass consistent with a proton.
- The data is dominated by a large bump at low two-pi mass and high missing mass
- ρ events from photons below the range of the tagger can only account for some of this enhancement
- Dave can account for most of the enhancement by adding continuum 2-pion events; JS pointed out that multi-prong events (5 pions, etc) could account for some of this as well.
- Cutting on the energy of the 2-pion pair cleans up the data considerably.