Difference between revisions of "Mattione Update 06252012"

Revision as of 11:24, 25 June 2012

γ p → Y(2175), p
- Y(2175) → π⁺, π^-, φ
  - φ → K⁺, K^-
Final State: p, π⁺, π^-, K⁺, K^-
Events Generated using genr8 with: 9 GeV Photons, Γ_Y(2175) = 61 MeV/c², t-slope = 5.0, 50.0 < Vertex-Z (cm) < 80.0

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!)
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):
- Require the detection of at least 2+ and 2- tracks (proton is treated as missing)
- Require the combined FOM for PID (π⁺, π^-, K⁺, K^-) be > 1%
- Place very loose cuts on the φ invariant mass (0.8 - 1.3) and p missing mass (0.5 - 1.4): reduces # of bogus track combinations to save time / cleanup histograms
- Kinematic Fit: 4-momentum conservation: p missing mass, φ invariant mass
- Require that the confidence level from the kinematic fit be > 1%

φ Invariant Mass	Proton Missing Mass	Y(2175) Invariant Mass

@@ Line 42: / Line 42: @@
 == Initial Mass Peaks ==
 * &phi; Invariant Mass
-[[Image:Mattione_Update_06252012_Mass_Phi.png|left|500px|]]
+{| class="wikitable"
+| [[Image:Mattione_Update_06252012_Mass_Phi.png|thumb|left|400px|&phi; Invariant Mass]]
+| [[Image:Mattione_Update_06252012_Mass_Proton.png|thumb|left|400px|Proton Missing Mass]]
+| [[Image:Mattione_Update_06252012_Mass_Y2175.png|thumb|left|400px|Y(2175) Invariant Mass]]
+|}
 <br style="clear:both;"/>
 * Proton Missing Mass
-[[Image:Mattione_Update_06252012_Mass_Proton.png|left|500px|]]
 <br style="clear:both;"/>
 * Y(2175) Invariant Mass
-[[Image:Mattione_Update_06252012_Mass_Y2175.png|left|500px|]]
 <br style="clear:both;"/>