Difference between revisions of "Mattione Kaon PID Studies Y2175"
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(Created page with "== Reaction == * γ p → Y(2175), p ** Y(2175) → π<sup>+</sup>, π<sup>-</sup>, φ *** φ → K<sup>+</sup>, K<sup>-</sup> * Final State: p, π<sup>...") |
(→Yield %'s & Signal / Background Ratios) |
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== Reaction == | == Reaction == | ||
* γ p → Y(2175), p | * γ p → Y(2175), p | ||
− | ** Y(2175) → π<sup>+</sup>, π<sup>-</sup> | + | ** Y(2175) → f<sub>0</sub>(980)<sup>0</sup>, φ |
− | *** φ → K<sup>+</sup>, K<sup>-</sup> | + | *** f<sub>0</sub>(980)<sup>0</sup> → π<sup>+</sup>, π<sup>-</sup> |
+ | **** φ → K<sup>+</sup>, K<sup>-</sup> | ||
* Final State: p, π<sup>+</sup>, π<sup>-</sup>, K<sup>+</sup>, K<sup>-</sup> | * Final State: p, π<sup>+</sup>, π<sup>-</sup>, K<sup>+</sup>, K<sup>-</sup> | ||
* Events generated with: Γ<sub>Y(2175)</sub> = 61 MeV/c<sup>2</sup>, t-slope = 5.0, 50.0 < Vertex-Z (cm) < 80.0 | * Events generated with: Γ<sub>Y(2175)</sub> = 61 MeV/c<sup>2</sup>, t-slope = 5.0, 50.0 < Vertex-Z (cm) < 80.0 | ||
+ | |||
+ | == Analysis Overview == | ||
+ | * For each q = +/- particle in the reaction, all detected q = +/- tracks are tested as to whether or not they are that particle | ||
+ | ** e.g. If a q = + track has PID FOM > 1% for both the π<sup>+</sup> & K<sup>+</sup>: allow both combinations (DO NOT take the best FOM as true!) | ||
+ | * Maximum of 8 tracks per event (to cut down on memory spikes). | ||
+ | * The analysis (cuts/histing/kinfits) is then performed on each possible track combination (events are only cut if every one of their track combinations is cut): | ||
+ | ** Required 45.0 < Track-Vertex-Z (cm) < 85.0 | ||
+ | ** EXTREMELY loose mass cuts around each mass peak (typically at the histogram edges): saves time by reducing # of kinematic fits to perform | ||
+ | ** Require the combined FOM for PID (χ<sup>2</sup> and NDF of all tracks summed together) be > 1% | ||
+ | ** Where kinematic fit: Require that the confidence level from the kinematic fit be > 1% | ||
+ | ** Mass cuts as illustrated. | ||
+ | |||
+ | == Mass Peaks & Kinematic Fitting == | ||
+ | |||
+ | * NOTES: | ||
+ | ** Plots are shown for "Missing p, VertexP4 KinFit" only. | ||
+ | ** Mass Plots: Pre-KinFit is Magenta, Post-KinFit is Teal | ||
+ | ** Kinematic Fit Confidence Level is zoomed in: spike at 0 confidence is well off the top of the plot | ||
+ | ** For the genr8 background, It wasn't possible to lineup every mass peak (without generating the recoil proton at a bogus mass), so the missing mass peak is a little off-center. | ||
+ | ** If a cut is shown, then all "Post-KinFit" plots after that cut include it. | ||
+ | {| border="1" cellpadding="2" align="left" valign="top" style="text-align:center;" | ||
+ | !width="75"| Plot | ||
+ | !width="350"| genr8 Y(2175) Signal | ||
+ | !width="350"| genr8 Y(2175) Background | ||
+ | !width="350"| bggen Background | ||
+ | |- | ||
+ | ! Confidence Level | ||
+ | | [[Image:Mattione_Update_09132012_KinFitConLev_MissingP_VertexP4KinFit_Y2175.png|left|350px]] || [[Image:Mattione_Update_09132012_KinFitConLev_MissingP_VertexP4KinFit_Y2175bkgnd.png|left|350px]] || [[Image:Mattione_Update_09132012_KinFitConLev_MissingP_VertexP4KinFit_Y2175bggen.png|left|350px]] | ||
+ | |- | ||
+ | ! Missing Mass | ||
+ | | [[Image:Mattione_Update_09132012_MissingMass_MissingP_VertexP4KinFit_Y2175.png|left|350px]] || [[Image:Mattione_Update_09132012_MissingMass_MissingP_VertexP4KinFit_Y2175bkgnd.png|left|350px]] || [[Image:Mattione_Update_09132012_MissingMass_MissingP_VertexP4KinFit_Y2175bggen.png|left|350px]] | ||
+ | |- | ||
+ | ! φ Mass | ||
+ | | [[Image:Mattione_Update_09132012_PhiMass_MissingP_VertexP4KinFit_Y2175.png|left|350px]] || [[Image:Mattione_Update_09132012_PhiMass_MissingP_VertexP4KinFit_Y2175bkgnd.png|left|350px]] || [[Image:Mattione_Update_09132012_PhiMass_MissingP_VertexP4KinFit_Y2175bggen.png|left|350px]] | ||
+ | |- | ||
+ | ! Y(2175) Mass | ||
+ | | [[Image:Mattione_Update_09132012_Y2175Mass_MissingP_VertexP4KinFit_Y2175.png|left|350px]] || [[Image:Mattione_Update_09132012_Y2175Mass_MissingP_VertexP4KinFit_Y2175bkgnd.png|left|350px]] || [[Image:Mattione_Update_09132012_Y2175Mass_MissingP_VertexP4KinFit_Y2175bggen.png|left|350px]] | ||
+ | |} | ||
+ | <br style="clear:both;"/> | ||
+ | |||
+ | == Cherenkov Detector Comparison == | ||
+ | |||
+ | === genr8 Y(2175) Background === | ||
+ | |||
+ | * P vs. θ of π<sup>+</sup>'s as K<sup>+</sup> candidates ("All" means all post-analysis cuts, pre-Cherenkov cuts) | ||
+ | ** π<sup>-</sup>'s as K<sup>-</sup> not shown: identical due to symmetry. | ||
+ | ** Plots are shown for "Missing p, VertexP4 KinFit" only. | ||
+ | {| border="1" cellpadding="2" align="left" valign="top" style="text-align:center;" | ||
+ | !width="75"| Detector | ||
+ | !width="350"| % of Pions That Fail Kaon Cut | ||
+ | !width="350"| Pions That Fail Kaon Cut | ||
+ | !width="350"| Pions That Survive Kaon Cut | ||
+ | |- | ||
+ | ! No CKOV | ||
+ | | [[Image:Mattione_Update_09132012_PVsTheta_PiPlusPassKPlus_All_MissingP_VertexP4KinFit_Y2175bkgnd.png|left|350px]] || NA || NA | ||
+ | |- | ||
+ | ! He DC | ||
+ | | 23.57% || [[Image:Mattione_Update_09132012_PVsTheta_PiPlusPassKPlus_FailedHeDC_MissingP_VertexP4KinFit_Y2175bkgnd.png|left|350px]] || [[Image:Mattione_Update_09132012_PVsTheta_PiPlusPassKPlus_PassedHeDC_MissingP_VertexP4KinFit_Y2175bkgnd.png|left|350px]] | ||
+ | |- | ||
+ | ! Gas Threshold | ||
+ | | 10.24% || [[Image:Mattione_Update_09132012_PVsTheta_PiPlusPassKPlus_FailedGasThresh_MissingP_VertexP4KinFit_Y2175bkgnd.png|left|350px]] || [[Image:Mattione_Update_09132012_PVsTheta_PiPlusPassKPlus_PassedGasThresh_MissingP_VertexP4KinFit_Y2175bkgnd.png|left|350px]] | ||
+ | |- | ||
+ | ! HBRICH | ||
+ | | <span style="color:blue">98.40%</span> || [[Image:Mattione_Update_09132012_PVsTheta_PiPlusPassKPlus_FailedRICH_MissingP_VertexP4KinFit_Y2175bkgnd.png|left|350px]] || [[Image:Mattione_Update_09132012_PVsTheta_PiPlusPassKPlus_PassedRICH_MissingP_VertexP4KinFit_Y2175bkgnd.png|left|350px]] | ||
+ | |- | ||
+ | ! LHCb RICH | ||
+ | | <span style="color:blue">98.01%</span> || [[Image:Mattione_Update_09132012_PVsTheta_PiPlusPassKPlus_FailedLHCbRICH_MissingP_VertexP4KinFit_Y2175bkgnd.png|left|350px]] || [[Image:Mattione_Update_09132012_PVsTheta_PiPlusPassKPlus_PassedLHCbRICH_MissingP_VertexP4KinFit_Y2175bkgnd.png|left|350px]] | ||
+ | |} | ||
+ | <br style="clear:both;"/> | ||
+ | |||
+ | === bggen Background === | ||
+ | |||
+ | * P vs. θ of π<sup>+</sup>'s as K<sup>+</sup> candidates ("All" means all post-analysis cuts, pre-Cherenkov cuts) | ||
+ | ** π<sup>-</sup>'s as K<sup>-</sup> not shown: identical due to symmetry. | ||
+ | ** Plots are shown for "Missing p, VertexP4 KinFit" only. | ||
+ | {| border="1" cellpadding="2" align="left" valign="top" style="text-align:center;" | ||
+ | !width="75"| Detector | ||
+ | !width="350"| % of Pions That Fail Kaon Cut | ||
+ | !width="350"| Pions That Fail Kaon Cut | ||
+ | !width="350"| Pions That Survive Kaon Cut | ||
+ | |- | ||
+ | ! No CKOV | ||
+ | | [[Image:Mattione_Update_09132012_PVsTheta_PiPlusPassKPlus_All_MissingP_VertexP4KinFit_Y2175bggen.png|left|350px]] || NA || NA | ||
+ | |- | ||
+ | ! He DC | ||
+ | | 22.92% || [[Image:Mattione_Update_09132012_PVsTheta_PiPlusPassKPlus_FailedHeDC_MissingP_VertexP4KinFit_Y2175bggen.png|left|350px]] || [[Image:Mattione_Update_09132012_PVsTheta_PiPlusPassKPlus_PassedHeDC_MissingP_VertexP4KinFit_Y2175bggen.png|left|350px]] | ||
+ | |- | ||
+ | ! Gas Threshold | ||
+ | | 7.55% || [[Image:Mattione_Update_09132012_PVsTheta_PiPlusPassKPlus_FailedGasThresh_MissingP_VertexP4KinFit_Y2175bggen.png|left|350px]] || [[Image:Mattione_Update_09132012_PVsTheta_PiPlusPassKPlus_PassedGasThresh_MissingP_VertexP4KinFit_Y2175bggen.png|left|350px]] | ||
+ | |- | ||
+ | ! HBRICH | ||
+ | | <span style="color:blue">56.77%</span> || [[Image:Mattione_Update_09132012_PVsTheta_PiPlusPassKPlus_FailedRICH_MissingP_VertexP4KinFit_Y2175bggen.png|left|350px]] || [[Image:Mattione_Update_09132012_PVsTheta_PiPlusPassKPlus_PassedRICH_MissingP_VertexP4KinFit_Y2175bggen.png|left|350px]] | ||
+ | |- | ||
+ | ! LHCb RICH | ||
+ | | <span style="color:blue">60.42%</span> || [[Image:Mattione_Update_09132012_PVsTheta_PiPlusPassKPlus_FailedLHCbRICH_MissingP_VertexP4KinFit_Y2175bggen.png|left|350px]] || [[Image:Mattione_Update_09132012_PVsTheta_PiPlusPassKPlus_PassedLHCbRICH_MissingP_VertexP4KinFit_Y2175bggen.png|left|350px]] | ||
+ | |} | ||
+ | <br style="clear:both;"/> | ||
+ | |||
+ | == Yield %'s & Signal / Background Ratios == | ||
+ | * ALL data are determined in the signal region (track combinations with invariant mass outside of the signal region are ignored), and from E<sub>γ</sub> = 8.5 - 9.0 GeV | ||
+ | |||
+ | === Yield %'s === | ||
+ | * % of generated events remaining after all cuts (including a final cut requiring that all tracks have the correct THROWN PID) | ||
+ | {| border="1" cellpadding="2" align="left" valign="top" style="text-align:center;" | ||
+ | !width="200"| Detector / PID Cut | ||
+ | !width="300"| Missing p, No Fit | ||
+ | !width="300"| Missing p, P4 Fit | ||
+ | !width="300"| Missing p, VertexP4 Fit | ||
+ | !width="300"| No Missing, No Fit | ||
+ | !width="300"| No Missing, P4 Fit | ||
+ | !width="300"| No Missing, VertexP4 Fit | ||
+ | |- | ||
+ | ! No CKOV | ||
+ | | 9.66363% || 9.91859% || 7.50864% || 5.08872% || 3.3008% || 2.64085% | ||
+ | |- | ||
+ | ! He DC <br style="clear:both;"/> K: 1 Exclusive | ||
+ | | 7.6393% || 7.75866% || 5.92137% || 4.00075% || 2.58191% || 2.06825% | ||
+ | |- | ||
+ | ! Gas Threshold <br style="clear:both;"/> K: 1 Exclusive | ||
+ | | 9.34382% || 9.60139% || 7.32316% || 4.92314% || 3.2149% || 2.57775% | ||
+ | |- | ||
+ | ! HBRICH <br style="clear:both;"/> K: 1 Exclusive | ||
+ | | 9.17437% || 9.41574% || 7.18456% || 4.83356% || 3.15836% || 2.53028% | ||
+ | |- | ||
+ | ! LHCb RICH <br style="clear:both;"/> K: 1 Exclusive | ||
+ | | 9.25765% || 9.51254% || 7.2575% || 4.87959% || 3.19227% || 2.55721% | ||
+ | |} | ||
+ | <br style="clear:both;"/> | ||
+ | |||
+ | === Exclusive Kaon Cut Signal Yield Loss === | ||
+ | * % of pre-CKOV signal events LOST due to exclusive Kaon cut | ||
+ | {| border="1" cellpadding="2" align="left" valign="top" style="text-align:center;" | ||
+ | !width="200"| Detector / PID Cut | ||
+ | !width="300"| Missing p, No Fit | ||
+ | !width="300"| Missing p, P4 Fit | ||
+ | !width="300"| Missing p, VertexP4 Fit | ||
+ | !width="300"| No Missing, No Fit | ||
+ | !width="300"| No Missing, P4 Fit | ||
+ | !width="300"| No Missing, VertexP4 Fit | ||
+ | |- | ||
+ | ! He DC <br style="clear:both;"/> K: 1 Exclusive | ||
+ | | 20.9479% || 21.7766% || 21.1393% || 21.38% || 21.7791% || 21.6826% | ||
+ | |- | ||
+ | ! Gas Threshold <br style="clear:both;"/> K: 1 Exclusive | ||
+ | | 3.30938% || 3.19803% || 2.47022% || 3.25377% || 2.60219% || 2.38949% | ||
+ | |- | ||
+ | ! HBRICH <br style="clear:both;"/> K: 1 Exclusive | ||
+ | | 5.06284% || 5.06975% || 4.31607% || 5.01412% || 4.31516% || 4.18701% | ||
+ | |- | ||
+ | ! LHCb RICH <br style="clear:both;"/> K: 1 Exclusive | ||
+ | | 4.20113% || 4.09389% || 3.34465% || 4.10968% || 3.28807% || 3.16726% | ||
+ | |} | ||
+ | <br style="clear:both;"/> | ||
+ | |||
+ | === Signal / Background Ratios === | ||
+ | * Signal / Background Ratios | ||
+ | {| border="1" cellpadding="2" align="left" valign="top" style="text-align:center;" | ||
+ | !width="200"| Detector / PID Cut | ||
+ | !width="300"| Missing p, No Fit | ||
+ | !width="300"| Missing p, P4 Fit | ||
+ | !width="300"| Missing p, VertexP4 Fit | ||
+ | !width="300"| No Missing, No Fit | ||
+ | !width="300"| No Missing, P4 Fit | ||
+ | !width="300"| No Missing, VertexP4 Fit | ||
+ | |- | ||
+ | ! No CKOV | ||
+ | | 0.00106212 || 0.00136379 || 0.0250697 || 0.0135034 || || | ||
+ | |- | ||
+ | ! He DC <br style="clear:both;"/> K: Inclusive | ||
+ | | 0.00117589 || 0.00153125 || 0.0365619 || 0.0171601 || || | ||
+ | |- | ||
+ | ! Gas Threshold <br style="clear:both;"/> K: Inclusive | ||
+ | | 0.00109474 || 0.00140526 || 0.0343859 || 0.0150712 || || | ||
+ | |- | ||
+ | ! HBRICH <br style="clear:both;"/> K: Inclusive | ||
+ | | 0.00126519 || 0.00166155 || 0.0585217 || 0.0309852 || || | ||
+ | |- | ||
+ | ! LHCb RICH <br style="clear:both;"/> K: Inclusive | ||
+ | | 0.00121623 || 0.00160001 || 0.0530719 || 0.0247906 || || | ||
+ | |- | ||
+ | ! He DC <br style="clear:both;"/> K: 1 Exclusive | ||
+ | | 0.00312333 || 0.00395292 || 0.0658157 || 0.0337837 || || | ||
+ | |- | ||
+ | ! Gas Threshold <br style="clear:both;"/> K: 1 Exclusive | ||
+ | | 0.00343035 || 0.00432616 || 0.0813565 || 0.0311833 || || | ||
+ | |- | ||
+ | ! HBRICH <br style="clear:both;"/> K: 1 Exclusive | ||
+ | | 0.00397305 || 0.00518064 || 0.104682 || 0.0524333 || || | ||
+ | |- | ||
+ | ! LHCb RICH <br style="clear:both;"/> K: 1 Exclusive | ||
+ | | 0.00385906 || 0.00495419 || 0.105741 || 0.0427721 || || | ||
+ | |} | ||
+ | <br style="clear:both;"/> | ||
+ | |||
+ | === Signal / Background Ratios : Improvements Over No CKOV === | ||
+ | * Detector Signal / Background Ratio (StBR) DIVIDED BY No CKOV StBR | ||
+ | {| border="1" cellpadding="2" align="left" valign="top" style="text-align:center;" | ||
+ | !width="200"| Detector / PID Cut | ||
+ | !width="300"| Missing p, No Fit | ||
+ | !width="300"| Missing p, P4 Fit | ||
+ | !width="300"| Missing p, VertexP4 Fit | ||
+ | !width="300"| No Missing, No Fit | ||
+ | !width="300"| No Missing, P4 Fit | ||
+ | !width="300"| No Missing, VertexP4 Fit | ||
+ | |- | ||
+ | ! He DC <br style="clear:both;"/> K: Inclusive | ||
+ | | 1.10711 || 1.1228 || 1.45841 || 1.2708 || || | ||
+ | |- | ||
+ | ! Gas Threshold <br style="clear:both;"/> K: Inclusive | ||
+ | | 1.03071 || 1.03041 || 1.37161 || 1.11611 || || | ||
+ | |- | ||
+ | ! HBRICH <br style="clear:both;"/> K: Inclusive | ||
+ | | 1.19119 || 1.21834 || 2.33436 || 2.29462 || || | ||
+ | |- | ||
+ | ! LHCb RICH <br style="clear:both;"/> K: Inclusive | ||
+ | | 1.14509 || 1.17321 || 2.11697 || 1.83588 || || | ||
+ | |- | ||
+ | ! He DC <br style="clear:both;"/> K: 1 Exclusive | ||
+ | | 2.94065 || 2.89849 || 2.6253 || 2.50187 || || | ||
+ | |- | ||
+ | ! Gas Threshold <br style="clear:both;"/> K: 1 Exclusive | ||
+ | | 3.22971 || 3.17217 || 3.24521 || 2.30929 || || | ||
+ | |- | ||
+ | ! HBRICH <br style="clear:both;"/> K: 1 Exclusive | ||
+ | | 3.74067 || 3.79871 || 4.17563 || 3.88297 || || | ||
+ | |- | ||
+ | ! LHCb RICH <br style="clear:both;"/> K: 1 Exclusive | ||
+ | | 3.63334 || 3.63267 || 4.21788 || 3.16751 || || | ||
+ | |} | ||
+ | <br style="clear:both;"/> | ||
+ | |||
+ | <!-- | ||
+ | == Yields %'s == | ||
+ | * ALL yield %'s are determined in the signal region (track combinations with invariant mass outside of the signal region are ignored) | ||
+ | |||
+ | === genr8 Y(2175) Signal Events === | ||
+ | |||
+ | * % of generated events remaining after all cuts (including a final cut requiring that all tracks have the correct THROWN PID) | ||
+ | {| border="1" cellpadding="2" align="left" valign="top" style="text-align:center;" | ||
+ | !width="350"| Missing p, No KinFit | ||
+ | !width="350"| Missing p, P4 KinFit | ||
+ | !width="350"| Missing p, VertexP4 KinFit | ||
+ | !width="350"| No Missing, No KinFit | ||
+ | !width="350"| No Missing, P4 KinFit | ||
+ | !width="350"| No Missing, VertexP4 KinFit | ||
+ | |- | ||
+ | | || 8.37% || 7.55% || || || | ||
+ | |} | ||
+ | <br style="clear:both;"/> | ||
+ | |||
+ | * % of BAD reconstructed combos remaining (BAD combo: a combo where at least one track has the wrong THROWN PID) | ||
+ | {| border="1" cellpadding="2" align="left" valign="top" style="text-align:center;" | ||
+ | !width="75"| Detector | ||
+ | !width="350"| Missing p, No KinFit | ||
+ | !width="350"| Missing p, P4 KinFit | ||
+ | !width="350"| Missing p, VertexP4 KinFit | ||
+ | !width="350"| No Missing, No KinFit | ||
+ | !width="350"| No Missing, P4 KinFit | ||
+ | !width="350"| No Missing, VertexP4 KinFit | ||
+ | |- | ||
+ | ! No CKOV | ||
+ | | || <span style="color:red">3.09%</span> || <span style="color:green">1.61%</span> || || || | ||
+ | |- | ||
+ | ! He DC | ||
+ | | || 2.85% || 1.41% || || || | ||
+ | |- | ||
+ | ! Gas Thresh. | ||
+ | | || 3.01% || 1.55% || || || | ||
+ | |- | ||
+ | ! HBRICH | ||
+ | | || 2.61% || <span style="color:blue">1.23%</span> || || || | ||
+ | |- | ||
+ | ! LHCb RICH | ||
+ | | || 2.58% || <span style="color:blue">1.21%</span> || || || | ||
+ | |} | ||
+ | <br style="clear:both;"/> | ||
+ | |||
+ | === genr8 Y(2175) Background Events === | ||
+ | |||
+ | * % of reconstructed combos remaining | ||
+ | {| border="1" cellpadding="2" align="left" valign="top" style="text-align:center;" | ||
+ | !width="75"| Detector | ||
+ | !width="350"| Missing p, No KinFit | ||
+ | !width="350"| Missing p, P4 KinFit | ||
+ | !width="350"| Missing p, VertexP4 KinFit | ||
+ | !width="350"| No Missing, No KinFit | ||
+ | !width="350"| No Missing, P4 KinFit | ||
+ | !width="350"| No Missing, VertexP4 KinFit | ||
+ | |- | ||
+ | ! No CKOV | ||
+ | | || 0.85% || 0.65% || || || | ||
+ | |- | ||
+ | ! He DC | ||
+ | | || 0.51% || 0.37% || || || | ||
+ | |- | ||
+ | ! Gas Thresh. | ||
+ | | || 0.76% || 0.59% || || || | ||
+ | |- | ||
+ | ! HBRICH | ||
+ | | || 0.034% || <span style="color:blue">0.0014%</span> || || || | ||
+ | |- | ||
+ | ! LHCb RICH | ||
+ | | || 0.034% || <span style="color:blue">0.0014%</span> || || || | ||
+ | |} | ||
+ | <br style="clear:both;"/> | ||
+ | |||
+ | === bggen Background Events === | ||
+ | |||
+ | * % of reconstructed combos remaining | ||
+ | {| border="1" cellpadding="2" align="left" valign="top" style="text-align:center;" | ||
+ | !width="75"| Detector | ||
+ | !width="350"| Missing p, No KinFit | ||
+ | !width="350"| Missing p, P4 KinFit | ||
+ | !width="350"| Missing p, VertexP4 KinFit | ||
+ | !width="350"| No Missing, No KinFit | ||
+ | !width="350"| No Missing, P4 KinFit | ||
+ | !width="350"| No Missing, VertexP4 KinFit | ||
+ | |- | ||
+ | ! No CKOV | ||
+ | | || <span style="color:red">0.098%</span> || <span style="color:green">0.0085%</span> || || || | ||
+ | |- | ||
+ | ! He DC | ||
+ | | || 0.085% || 0.0053% || || || | ||
+ | |- | ||
+ | ! Gas Thresh. | ||
+ | | || 0.096% || 0.0080% || || || | ||
+ | |- | ||
+ | ! HBRICH | ||
+ | | || 0.071% || <span style="color:blue">0.0031%</span> || || || | ||
+ | |- | ||
+ | ! LHCb RICH | ||
+ | | || 0.071% || <span style="color:blue">0.0029%</span> || || || | ||
+ | |} | ||
+ | <br style="clear:both;"/> | ||
+ | --> |
Latest revision as of 12:07, 26 September 2012
Contents
Reaction
- γ p → Y(2175), p
- Y(2175) → f0(980)0, φ
- f0(980)0 → π+, π-
- φ → K+, K-
- f0(980)0 → π+, π-
- Y(2175) → f0(980)0, φ
- Final State: p, π+, π-, K+, K-
- Events generated with: ΓY(2175) = 61 MeV/c2, t-slope = 5.0, 50.0 < Vertex-Z (cm) < 80.0
Analysis Overview
- For each q = +/- particle in the reaction, all detected q = +/- tracks are tested as to whether or not they are that particle
- e.g. If a q = + track has PID FOM > 1% for both the π+ & K+: allow both combinations (DO NOT take the best FOM as true!)
- Maximum of 8 tracks per event (to cut down on memory spikes).
- The analysis (cuts/histing/kinfits) is then performed on each possible track combination (events are only cut if every one of their track combinations is cut):
- Required 45.0 < Track-Vertex-Z (cm) < 85.0
- EXTREMELY loose mass cuts around each mass peak (typically at the histogram edges): saves time by reducing # of kinematic fits to perform
- Require the combined FOM for PID (χ2 and NDF of all tracks summed together) be > 1%
- Where kinematic fit: Require that the confidence level from the kinematic fit be > 1%
- Mass cuts as illustrated.
Mass Peaks & Kinematic Fitting
- NOTES:
- Plots are shown for "Missing p, VertexP4 KinFit" only.
- Mass Plots: Pre-KinFit is Magenta, Post-KinFit is Teal
- Kinematic Fit Confidence Level is zoomed in: spike at 0 confidence is well off the top of the plot
- For the genr8 background, It wasn't possible to lineup every mass peak (without generating the recoil proton at a bogus mass), so the missing mass peak is a little off-center.
- If a cut is shown, then all "Post-KinFit" plots after that cut include it.
Plot | genr8 Y(2175) Signal | genr8 Y(2175) Background | bggen Background |
---|---|---|---|
Confidence Level | |||
Missing Mass | |||
φ Mass | |||
Y(2175) Mass |
Cherenkov Detector Comparison
genr8 Y(2175) Background
- P vs. θ of π+'s as K+ candidates ("All" means all post-analysis cuts, pre-Cherenkov cuts)
- π-'s as K- not shown: identical due to symmetry.
- Plots are shown for "Missing p, VertexP4 KinFit" only.
Detector | % of Pions That Fail Kaon Cut | Pions That Fail Kaon Cut | Pions That Survive Kaon Cut |
---|---|---|---|
No CKOV | NA | NA | |
He DC | 23.57% | ||
Gas Threshold | 10.24% | ||
HBRICH | 98.40% | ||
LHCb RICH | 98.01% |
bggen Background
- P vs. θ of π+'s as K+ candidates ("All" means all post-analysis cuts, pre-Cherenkov cuts)
- π-'s as K- not shown: identical due to symmetry.
- Plots are shown for "Missing p, VertexP4 KinFit" only.
Detector | % of Pions That Fail Kaon Cut | Pions That Fail Kaon Cut | Pions That Survive Kaon Cut |
---|---|---|---|
No CKOV | NA | NA | |
He DC | 22.92% | ||
Gas Threshold | 7.55% | ||
HBRICH | 56.77% | ||
LHCb RICH | 60.42% |
Yield %'s & Signal / Background Ratios
- ALL data are determined in the signal region (track combinations with invariant mass outside of the signal region are ignored), and from Eγ = 8.5 - 9.0 GeV
Yield %'s
- % of generated events remaining after all cuts (including a final cut requiring that all tracks have the correct THROWN PID)
Detector / PID Cut | Missing p, No Fit | Missing p, P4 Fit | Missing p, VertexP4 Fit | No Missing, No Fit | No Missing, P4 Fit | No Missing, VertexP4 Fit |
---|---|---|---|---|---|---|
No CKOV | 9.66363% | 9.91859% | 7.50864% | 5.08872% | 3.3008% | 2.64085% |
He DC K: 1 Exclusive |
7.6393% | 7.75866% | 5.92137% | 4.00075% | 2.58191% | 2.06825% |
Gas Threshold K: 1 Exclusive |
9.34382% | 9.60139% | 7.32316% | 4.92314% | 3.2149% | 2.57775% |
HBRICH K: 1 Exclusive |
9.17437% | 9.41574% | 7.18456% | 4.83356% | 3.15836% | 2.53028% |
LHCb RICH K: 1 Exclusive |
9.25765% | 9.51254% | 7.2575% | 4.87959% | 3.19227% | 2.55721% |
Exclusive Kaon Cut Signal Yield Loss
- % of pre-CKOV signal events LOST due to exclusive Kaon cut
Detector / PID Cut | Missing p, No Fit | Missing p, P4 Fit | Missing p, VertexP4 Fit | No Missing, No Fit | No Missing, P4 Fit | No Missing, VertexP4 Fit |
---|---|---|---|---|---|---|
He DC K: 1 Exclusive |
20.9479% | 21.7766% | 21.1393% | 21.38% | 21.7791% | 21.6826% |
Gas Threshold K: 1 Exclusive |
3.30938% | 3.19803% | 2.47022% | 3.25377% | 2.60219% | 2.38949% |
HBRICH K: 1 Exclusive |
5.06284% | 5.06975% | 4.31607% | 5.01412% | 4.31516% | 4.18701% |
LHCb RICH K: 1 Exclusive |
4.20113% | 4.09389% | 3.34465% | 4.10968% | 3.28807% | 3.16726% |
Signal / Background Ratios
- Signal / Background Ratios
Detector / PID Cut | Missing p, No Fit | Missing p, P4 Fit | Missing p, VertexP4 Fit | No Missing, No Fit | No Missing, P4 Fit | No Missing, VertexP4 Fit |
---|---|---|---|---|---|---|
No CKOV | 0.00106212 | 0.00136379 | 0.0250697 | 0.0135034 | ||
He DC K: Inclusive |
0.00117589 | 0.00153125 | 0.0365619 | 0.0171601 | ||
Gas Threshold K: Inclusive |
0.00109474 | 0.00140526 | 0.0343859 | 0.0150712 | ||
HBRICH K: Inclusive |
0.00126519 | 0.00166155 | 0.0585217 | 0.0309852 | ||
LHCb RICH K: Inclusive |
0.00121623 | 0.00160001 | 0.0530719 | 0.0247906 | ||
He DC K: 1 Exclusive |
0.00312333 | 0.00395292 | 0.0658157 | 0.0337837 | ||
Gas Threshold K: 1 Exclusive |
0.00343035 | 0.00432616 | 0.0813565 | 0.0311833 | ||
HBRICH K: 1 Exclusive |
0.00397305 | 0.00518064 | 0.104682 | 0.0524333 | ||
LHCb RICH K: 1 Exclusive |
0.00385906 | 0.00495419 | 0.105741 | 0.0427721 |
Signal / Background Ratios : Improvements Over No CKOV
- Detector Signal / Background Ratio (StBR) DIVIDED BY No CKOV StBR
Detector / PID Cut | Missing p, No Fit | Missing p, P4 Fit | Missing p, VertexP4 Fit | No Missing, No Fit | No Missing, P4 Fit | No Missing, VertexP4 Fit |
---|---|---|---|---|---|---|
He DC K: Inclusive |
1.10711 | 1.1228 | 1.45841 | 1.2708 | ||
Gas Threshold K: Inclusive |
1.03071 | 1.03041 | 1.37161 | 1.11611 | ||
HBRICH K: Inclusive |
1.19119 | 1.21834 | 2.33436 | 2.29462 | ||
LHCb RICH K: Inclusive |
1.14509 | 1.17321 | 2.11697 | 1.83588 | ||
He DC K: 1 Exclusive |
2.94065 | 2.89849 | 2.6253 | 2.50187 | ||
Gas Threshold K: 1 Exclusive |
3.22971 | 3.17217 | 3.24521 | 2.30929 | ||
HBRICH K: 1 Exclusive |
3.74067 | 3.79871 | 4.17563 | 3.88297 | ||
LHCb RICH K: 1 Exclusive |
3.63334 | 3.63267 | 4.21788 | 3.16751 |