Difference between revisions of "Mattione Update 09172012"
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=== LHCb RICH === | === LHCb RICH === | ||
* BIG IMPORTANT NOTE: These studies were performed with the parameters of the LHCb RICH AS IS (at a ~$4 million cost) | * BIG IMPORTANT NOTE: These studies were performed with the parameters of the LHCb RICH AS IS (at a ~$4 million cost) | ||
− | * From 0 to | + | * From 0 to ~11 degrees |
* 99.3% K/Pi separation from 0.6 to 2.6 GeV/c | * 99.3% K/Pi separation from 0.6 to 2.6 GeV/c | ||
* Perfect K/Pi separation above 2.6 GeV/c | * Perfect K/Pi separation above 2.6 GeV/c | ||
Line 42: | Line 42: | ||
=== Analysis === | === Analysis === | ||
+ | * Branching fractions and formulas used for determination of signal / background ratios: [[File:Mattione_Update_09172012_SignalToBackgroundCalc.pdf]] | ||
* Only the VertexP4 KinFit results (for both missing proton and no-missing) are shown here (results for no kinfit & p4 kinfit are in the reaction-specific sections) | * Only the VertexP4 KinFit results (for both missing proton and no-missing) are shown here (results for no kinfit & p4 kinfit are in the reaction-specific sections) | ||
* Cuts: 8.5 < E<sub>γ</sub> GeV < 9.0, PID confidence level (TOF, DC dE/dx) > 1%, Kinematic fit confidence level > 1%, +/- 1.5 Γ (~80% of signal integral) cut on resonance peaks | * Cuts: 8.5 < E<sub>γ</sub> GeV < 9.0, PID confidence level (TOF, DC dE/dx) > 1%, Kinematic fit confidence level > 1%, +/- 1.5 Γ (~80% of signal integral) cut on resonance peaks | ||
* "K: Inclusive" CKOV-Cut: 3-sigma cut on whether the particle COULD be a kaon | * "K: Inclusive" CKOV-Cut: 3-sigma cut on whether the particle COULD be a kaon | ||
* "K: 1 Exclusive" CKOV-Cut: 3-sigma cut on whether at least one kaon candidate WAS NOT a pion (require that the particle was definitely not a kaon at 99.7% certainty) | * "K: 1 Exclusive" CKOV-Cut: 3-sigma cut on whether at least one kaon candidate WAS NOT a pion (require that the particle was definitely not a kaon at 99.7% certainty) | ||
+ | ** Note: the loss of events due to this was a lot smaller than I thought it would be. However, this is because we get 4σ separation between pions & kaons with the TOF up to p = 2.5 GeV/c (with an 80ps σ) rather than up to 2 GeV/c as shown in the p-vs-theta plots in the proposal. | ||
+ | [[Image:Mattione_Update_09172012_TOFPiKDeltaT.png|left|450px]] | ||
+ | <br style="clear:both;"/> | ||
+ | * Note: Improvements in signal / background ratio (No-CKOV) by using VertexP4 KinFit instead of just P4 KinFit (with proton missing): | ||
+ | ** φ<sub>3</sub>(1850): 2.0x, Y(2175): 18.38x, η'<sub>1</sub>(2300): 8.5x, h'<sub>2</sub>(2600): 8.3x | ||
+ | |||
+ | === Ratios as Function of Cuts === | ||
+ | * φ<sub>3</sub>(1850) VertexP4 KinFit Signal / Background Ratios as Function of Analysis Actions (for pre-CKOV ONLY!!) | ||
+ | ** NOTE: This isn't a fair signal / background ratio comparison because: | ||
+ | *** I don't cut on the φ<sub>3</sub>(1850) mass until near the end | ||
+ | *** In this pass of the analysis, I generated the bggen events with the entire photon energy spectrum (the next pass I'm only generating between 8.5 & 9.0 GeV) | ||
+ | *** I didn't put a photon energy cut until the end. | ||
+ | {| class="wikitable" | ||
+ | | [[Image:Mattione_Update_09172012_SigBackRatioVsCut.png|left|550px]] | ||
+ | | [[Image:Mattione_Update_09172012_SigBackRatioVsCut_NoMissing.png|left|550px]] | ||
+ | |} | ||
+ | <br style="clear:both;"/> | ||
=== Yield %'s === | === Yield %'s === | ||
− | * % of generated events remaining after all cuts | + | * % of generated events remaining after all cuts |
{| border="1" cellpadding="2" align="left" valign="top" style="text-align:center;" | {| border="1" cellpadding="2" align="left" valign="top" style="text-align:center;" | ||
!width="100"| Detector / PID Cut | !width="100"| Detector / PID Cut |
Latest revision as of 23:40, 4 October 2012
Cherenkov Detector Details
Helium Drift Chamber
- From 1 to 18 degrees.
- K/proton separation not shown but is included in the study.
- Separation between Pions & Kaons as a function of momentum.
- Theta dependence changes above 12 degrees but is not shown (not super large).
Gas Threshold (Original Design)
- From ~1 or ~0 to 10 degrees
- No K/proton separation
- Separation between Pions & Kaons as a function of momentum.
- Theta dependence is present but not shown (not super large).
HBRICH
- From ~1 or ~0 to 20 degrees
- K/proton separation not shown but is included in the study.
- Separation between Pions & Kaons as a function of momentum.
- Theta dependence is present but not shown (not super large).
LHCb RICH
- BIG IMPORTANT NOTE: These studies were performed with the parameters of the LHCb RICH AS IS (at a ~$4 million cost)
- From 0 to ~11 degrees
- 99.3% K/Pi separation from 0.6 to 2.6 GeV/c
- Perfect K/Pi separation above 2.6 GeV/c
- 99.3% K/proton separation from 2.0 to 10.0 GeV/c
- Perfect K/proton separation above 10.0 GeV/c
Studies
- Kaon PID Studies: φ3(1850)
- Kaon PID Studies: Y(2175)
- Kaon PID Studies: η1'(2300)
- Kaon PID Studies: h2'(2600)
Summary
Analysis
- Branching fractions and formulas used for determination of signal / background ratios: File:Mattione Update 09172012 SignalToBackgroundCalc.pdf
- Only the VertexP4 KinFit results (for both missing proton and no-missing) are shown here (results for no kinfit & p4 kinfit are in the reaction-specific sections)
- Cuts: 8.5 < Eγ GeV < 9.0, PID confidence level (TOF, DC dE/dx) > 1%, Kinematic fit confidence level > 1%, +/- 1.5 Γ (~80% of signal integral) cut on resonance peaks
- "K: Inclusive" CKOV-Cut: 3-sigma cut on whether the particle COULD be a kaon
- "K: 1 Exclusive" CKOV-Cut: 3-sigma cut on whether at least one kaon candidate WAS NOT a pion (require that the particle was definitely not a kaon at 99.7% certainty)
- Note: the loss of events due to this was a lot smaller than I thought it would be. However, this is because we get 4σ separation between pions & kaons with the TOF up to p = 2.5 GeV/c (with an 80ps σ) rather than up to 2 GeV/c as shown in the p-vs-theta plots in the proposal.
- Note: Improvements in signal / background ratio (No-CKOV) by using VertexP4 KinFit instead of just P4 KinFit (with proton missing):
- φ3(1850): 2.0x, Y(2175): 18.38x, η'1(2300): 8.5x, h'2(2600): 8.3x
Ratios as Function of Cuts
- φ3(1850) VertexP4 KinFit Signal / Background Ratios as Function of Analysis Actions (for pre-CKOV ONLY!!)
- NOTE: This isn't a fair signal / background ratio comparison because:
- I don't cut on the φ3(1850) mass until near the end
- In this pass of the analysis, I generated the bggen events with the entire photon energy spectrum (the next pass I'm only generating between 8.5 & 9.0 GeV)
- I didn't put a photon energy cut until the end.
- NOTE: This isn't a fair signal / background ratio comparison because:
Yield %'s
- % of generated events remaining after all cuts
Detector / PID Cut | φ3(1850), (p) | Y(2175), (p) | η'1(2300), (p) | h'2(2600), (p) | φ3(1850), p | Y(2175), p | η'1(2300), p | h'2(2600), p |
---|---|---|---|---|---|---|---|---|
No CKOV | 27.1151% | 7.50864% | 2.28122% | 2.99637% | 11.6797% | 2.64085% | 0.823292% | 0.98661% |
He DC K: 1 Exclusive |
19.7511% | 5.92137% | 1.09893% | 2.05918% | 8.37895% | 2.06825% | 0.394798% | 0.698757% |
Gas Threshold K: 1 Exclusive |
24.3453% | 7.32316% | 1.36843% | 2.31741% | 9.99005% | 2.57775% | 0.493155% | 0.785577% |
HBRICH K: 1 Exclusive |
26.3715% | 7.18456% | 1.89643% | 2.61845% | 11.1512% | 2.53028% | 0.684736% | 0.909531% |
LHCb RICH K: 1 Exclusive |
26.1134% | 7.2575% | 1.50837% | 2.43328% | 10.8679% | 2.55721% | 0.542613% | 0.829916% |
Exclusive Kaon Cut Signal Yield Loss
- % of pre-CKOV signal events LOST due to exclusive Kaon cut
Detector / PID Cut | φ3(1850), (p) | Y(2175), (p) | η'1(2300), (p) | h'2(2600), (p) | φ3(1850), p | Y(2175), p | η'1(2300), p | h'2(2600), p |
---|---|---|---|---|---|---|---|---|
He DC K: 1 Exclusive |
27.1582% | 21.1393% | 51.8271% | 31.2778% | 28.2606% | 21.6826% | 52.0465% | 29.176% |
Gas Threshold K: 1 Exclusive |
10.2149% | 2.47022% | 40.013% | 22.6596% | 14.4665% | 2.38949% | 40.0996% | 20.3761% |
HBRICH K: 1 Exclusive |
2.74221% | 4.31607% | 16.8677% | 12.6127% | 4.52537% | 4.18701% | 16.8295% | 7.8125% |
LHCb RICH K: 1 Exclusive |
3.69439% | 3.34465% | 33.8788% | 18.7925% | 6.95065% | 3.16726% | 34.0923% | 15.882% |
Signal / Background Ratios
- Signal / Background Ratios
Detector / PID Cut | φ3(1850), (p) | Y(2175), (p) | η'1(2300), (p) | h'2(2600), (p) | φ3(1850), p | Y(2175), p | η'1(2300), p | h'2(2600), p |
---|---|---|---|---|---|---|---|---|
No CKOV | 0.0195118 | 0.0250697 | 0.00289624 | 0.0047081 | 1.07163 | |||
He DC K: Inclusive |
0.0331994 | 0.0365619 | 0.00362402 | 0.00650644 | 1.13469 | |||
Gas Threshold K: Inclusive |
0.0433289 | 0.0343859 | 0.00408972 | 0.00744195 | 1.15175 | |||
HBRICH K: Inclusive |
0.0583342 | 0.0585217 | 0.00443097 | 0.0122539 | 1.15841 | |||
LHCb RICH K: Inclusive |
0.0501617 | 0.0530719 | 0.00455084 | 0.0103902 | 1.15521 | |||
He DC K: 1 Exclusive |
0.0840888 | 0.0658157 | 0.0069218 | 0.0119952 | 1.23877 | |||
Gas Threshold K: 1 Exclusive |
0.115124 | 0.0813565 | 0.0080035 | 0.0123712 | 1.11751 | |||
HBRICH K: 1 Exclusive |
0.154364 | 0.104682 | 0.0124215 | 0.0202096 | 1.14907 | |||
LHCb RICH K: 1 Exclusive |
0.137432 | 0.105741 | 0.0112272 | 0.0167062 | 1.22991 |
Signal / Background Ratios : Improvements Over No CKOV
- Detector Signal / Background Ratio (StBR) DIVIDED BY No CKOV StBR
Detector / PID Cut | φ3(1850), (p) | Y(2175), (p) | η'1(2300), (p) | h'2(2600), (p) | φ3(1850), p | Y(2175), p | η'1(2300), p | h'2(2600), p |
---|---|---|---|---|---|---|---|---|
He DC K: Inclusive |
1.7015 | 1.45841 | 1.25129 | 1.38197 | 1.05884 | |||
Gas Threshold K: Inclusive |
2.22065 | 1.37161 | 1.41208 | 1.58067 | 1.07477 | |||
HBRICH K: Inclusive |
2.98968 | 2.33436 | 1.5299 | 2.60273 | 1.08098 | |||
LHCb RICH K: Inclusive |
2.57083 | 2.11697 | 1.57129 | 2.20688 | 1.07799 | |||
He DC K: 1 Exclusive |
4.30963 | 2.6253 | 2.38993 | 2.54777 | 1.15596 | |||
Gas Threshold K: 1 Exclusive |
5.90022 | 3.24521 | 2.76341 | 2.62763 | 1.04281 | |||
HBRICH K: 1 Exclusive |
7.91128 | 4.17563 | 4.28883 | 4.29252 | 1.07227 | |||
LHCb RICH K: 1 Exclusive |
7.04351 | 4.21788 | 3.87647 | 3.54839 | 1.1477 |