Difference between revisions of "Mattione Update 11072011"
From GlueXWiki
(Created page with "== Procedure == * Reconstruct π(1600) -> b1π events with t-slope = 2.0 (was 5.0 for X(2000)) using both the 334 and 1234 segmentations * Plot Δβ vs p for π<su...") |
(→π(1600) -> b1pi Events) |
||
| (13 intermediate revisions by the same user not shown) | |||
| Line 1: | Line 1: | ||
== Procedure == | == Procedure == | ||
| − | * Reconstruct π(1600) -> b1π events with t-slope = 2.0 | + | * Reconstruct π(1600) -> b1π events with t-slope = 2.0 using both the 334 and 1234 segmentations |
* Plot Δβ vs p for π<sup>+</sup> candidates to see proton, π<sup>+</sup> separation. | * Plot Δβ vs p for π<sup>+</sup> candidates to see proton, π<sup>+</sup> separation. | ||
| + | |||
| + | == π(1600) -> b1π Events == | ||
| + | |||
| + | === p vs. θ === | ||
| + | |||
| + | * p vs. θ | ||
| + | ** NOTE: time improvement only at forward angles, so will be negligible for protons in this reaction. | ||
| + | {| class="wikitable" | ||
| + | | [[Image:Mattione_Update_11072011_BCALPVsTheta_PiPlus.gif|thumb|left|400px|π<sup>+</sup>'s]] | ||
| + | | [[Image:Mattione_Update_11072011_BCALPVsTheta_Proton.gif|thumb|left|400px|protons]] | ||
| + | |} | ||
| + | |||
| + | === π<sup>+</sup> BCAL Δβ vs p === | ||
| + | Δβ = β<sub>p</sub> - β<sub>t</sub> = p/sqrt(p*p + m*m) - path/(c*TOF) | ||
| + | |||
| + | [[Image:Mattione_Update_10312011_BCALPiPlusDeltaBetaVsP_334Segmentation.gif|thumb|left|600px|334 Segmentation]] | ||
| + | <br style="clear:both;"/> | ||
| + | |||
| + | * π(1600) -> b1π Events, π<sup>+</sup> Candidates, BCAL Δβ vs p, 334 Segmentation | ||
| + | {| class="wikitable" | ||
| + | | [[Image:Mattione_Update_10312011_BCALPiPlusDeltaBetaVsP1200MeV_334Segmentation.gif|thumb|left|400px|p = 1.2 GeV/c, 334 Segmentation]] | ||
| + | | [[Image:Mattione_Update_10312011_BCALPiPlusDeltaBetaVsP1400MeV_334Segmentation.gif|thumb|left|400px|p = 1.4 GeV/c, 334 Segmentation]] | ||
| + | |- | ||
| + | | [[Image:Mattione_Update_10312011_BCALPiPlusDeltaBetaVsP1500MeV_334Segmentation.gif|thumb|left|400px|p = 1.5 GeV/c, 334 Segmentation]] | ||
| + | | [[Image:Mattione_Update_10312011_BCALPiPlusDeltaBetaVsP1600MeV_334Segmentation.gif|thumb|left|400px|p = 1.6 GeV/c, 334 Segmentation]] | ||
| + | |} | ||
| + | |||
| + | == Problems == | ||
| + | |||
| + | * π<sup>+</sup> Reconstructed BCAL Time Resolution Sample dE bin: | ||
| + | ** Expect to see significant resolution improvement between 15 < θ < 35. | ||
| + | ** NOTE: For 1234 Scheme: the shower time was smeared by: σ<sub>smear</sub> = sqrt(σ<sup>2</sup><sub>t_1234_Target</sub> - σ<sup>2</sup><sub>t_334_NoSmear</sub>), where σ<sub>t_1234_Target</sub> = σ<sub>t_334</sub>*Improvement_Ratio, Improvement_Ratio = σ<sub>t_1234</sub> / σ<sub>t_334</sub> | ||
| + | |||
| + | [[Image:Mattione_Update_11072011_BCALPiPlusSigmaTCompare_Bin1.gif|thumb|left|600px]] | ||
| + | <br style="clear:both;"/> | ||
| + | |||
| + | * π<sup>+</sup> BCAL Shower Δt Sample θ bin, Time Smearing Disabled: | ||
| + | ** Δt = t_reconstructed - t_true | ||
| + | ** Instead of a spike at zero, the long tail is due to the hit clustering. | ||
| + | ** Will decrease 1234 time smearing to match expected resolution improvement to 334. | ||
| + | [[Image:Mattione_Update_11072011_BCALPiPlusSigmaTNoSmear_SingleBin.gif|thumb|left|600px]] | ||
| + | <br style="clear:both;"/> | ||
| + | |||
| + | === Reference === | ||
| + | * Fit the results of David's study: Fit γ BCAL σ<sub>t_1234</sub> / σ<sub>t_334</sub> vs. θ in dE bins: show significant (> 10%) timing improvement is between 15 < θ < 35. | ||
| + | ** Don't trust fits at low-θ, so linearly-interpolate between 12 and 16 degrees. | ||
| + | [[Image:Mattione_Update_10312011_BCALPhotonTimeResolutionRatio_Fits1.gif|thumb|left|300px]] | ||
| + | <br style="clear:both;"/> | ||
Latest revision as of 14:50, 7 November 2011
Contents
Procedure
- Reconstruct π(1600) -> b1π events with t-slope = 2.0 using both the 334 and 1234 segmentations
- Plot Δβ vs p for π+ candidates to see proton, π+ separation.
π(1600) -> b1π Events
p vs. θ
- p vs. θ
- NOTE: time improvement only at forward angles, so will be negligible for protons in this reaction.
π+ BCAL Δβ vs p
Δβ = βp - βt = p/sqrt(p*p + m*m) - path/(c*TOF)
- π(1600) -> b1π Events, π+ Candidates, BCAL Δβ vs p, 334 Segmentation
Problems
- π+ Reconstructed BCAL Time Resolution Sample dE bin:
- Expect to see significant resolution improvement between 15 < θ < 35.
- NOTE: For 1234 Scheme: the shower time was smeared by: σsmear = sqrt(σ2t_1234_Target - σ2t_334_NoSmear), where σt_1234_Target = σt_334*Improvement_Ratio, Improvement_Ratio = σt_1234 / σt_334
- π+ BCAL Shower Δt Sample θ bin, Time Smearing Disabled:
- Δt = t_reconstructed - t_true
- Instead of a spike at zero, the long tail is due to the hit clustering.
- Will decrease 1234 time smearing to match expected resolution improvement to 334.
Reference
- Fit the results of David's study: Fit γ BCAL σt_1234 / σt_334 vs. θ in dE bins: show significant (> 10%) timing improvement is between 15 < θ < 35.
- Don't trust fits at low-θ, so linearly-interpolate between 12 and 16 degrees.
