Difference between revisions of "Mattione Update 10312011"
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== Procedure == | == 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<sup>+</sup> candidates to see proton, π<sup>+</sup> separation. | ||
+ | |||
+ | === Details === | ||
+ | * The 1234 segmentation is not available in the HDGEANT simulation, so the BCAL shower time for the 1234 segmentation was smeared manually during reconstruction | ||
+ | ** 1234: The BCAL hit-time smear was disabled in mc_smear | ||
+ | ** 1234: The shower time was smeared by: σ<sub>smear</sub> = sqrt(σ<sup>2</sup><sub>t_334</sub> - σ<sup>2</sup><sub>t_334_NoSmear</sub>) * σ<sub>t_1234</sub> / σ<sub>t_334</sub> | ||
* Fit David's γ σ<sub>t</sub> Improvement: Make dE, θ map | * Fit David's γ σ<sub>t</sub> Improvement: Make dE, θ map | ||
− | * Fit the π<sup>-</sup> & proton BCAL σ<sub>t</sub> vs θ distributions in dE bins | + | * Fit the π<sup>-</sup> & proton BCAL shower σ<sub>t</sub> vs θ distributions in dE bins: |
+ | ** Both the non-smeared and smeared | ||
+ | will apply improvement % to these resolutions. | ||
* Generate, simulate, smear, and reconstruct π(1600) -> b1π events with t-slope = 2.0 (was 5.0 for X(2000)) | * Generate, simulate, smear, and reconstruct π(1600) -> b1π events with t-slope = 2.0 (was 5.0 for X(2000)) | ||
− | ** For 1234 Segmentation, disabled BCAL hit t-smear in mc_smear, | + | ** For 1234 Segmentation, disabled BCAL hit t-smear in mc_smear, smeared reconstructed shower time as a function of dE & &theta during reconstruction to reach improved resolution. |
− | *** Proton, π<sup>+</sup>'s, π<sup>-</sup>'s all smeared the same | + | *** Proton, π<sup>+</sup>'s, π<sup>-</sup>'s all smeared the same. |
− | + | ||
== David's BCAL Photon Time Resolution Studies == | == David's BCAL Photon Time Resolution Studies == |
Revision as of 11:21, 31 October 2011
Contents
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+ candidates to see proton, π+ separation.
Details
- The 1234 segmentation is not available in the HDGEANT simulation, so the BCAL shower time for the 1234 segmentation was smeared manually during reconstruction
- 1234: The BCAL hit-time smear was disabled in mc_smear
- 1234: The shower time was smeared by: σsmear = sqrt(σ2t_334 - σ2t_334_NoSmear) * σt_1234 / σt_334
- Fit David's γ σt Improvement: Make dE, θ map
- Fit the π- & proton BCAL shower σt vs θ distributions in dE bins:
- Both the non-smeared and smeared
will apply improvement % to these resolutions.
- Generate, simulate, smear, and reconstruct π(1600) -> b1π events with t-slope = 2.0 (was 5.0 for X(2000))
- For 1234 Segmentation, disabled BCAL hit t-smear in mc_smear, smeared reconstructed shower time as a function of dE & &theta during reconstruction to reach improved resolution.
- Proton, π+'s, π-'s all smeared the same.
- For 1234 Segmentation, disabled BCAL hit t-smear in mc_smear, smeared reconstructed shower time as a function of dE & &theta during reconstruction to reach improved resolution.
David's BCAL Photon Time Resolution Studies
- γ BCAL σt vs. dE (GeV):
Time Resolution Segmentation Ratio
- γ BCAL σt_1234 / σt_334 vs. dE (GeV):
- Fits to γ BCAL σt_1234 / σt_334 vs. θ in dE bins:
- Don't trust fits at low-θ, so linearly-interpolate between 12 and 16 degrees.
BCAL π- 334 Segmentation σt Fits
- BCAL π- 334 Segmentation σt Fits vs. θ in dE bins:
X(2000) -> b1pi Events, π+ BCAL Δβ vs p
Δβ = βp - βt = p/sqrt(p*p + m*m) - path/(c*TOF)
- X(2000) -> b1pi Events, π+ BCAL Δβ vs p, 334 Segmentation:
- X(2000) -> b1pi Events, π+ BCAL Δβ vs p, 1234 Segmentation: