Dear fellow Blasters...
Below are preliminary Efficiency results of the shielding in the Left side. I've
also included the right sector efficiencies as well. More statistics are
certainly needed as indicated by low # of events in back angle CC's and from
prior experience with the efficiencies of L1, L2, R1, and R2 fluctuating
considerably from run to run.
But OVERALL... Left side looks astoundingly better. As mentioned by a fellow
devotee there is also a considerable increase in the efficiency of the right
side that is quite unexplainable. Results now follow:
====================================
--- CC Efficiency ---
====================================
!!!!!!!!!!!!!!!! BEFORE Shielding !!!!!!!!!!!!!!!!!!
--------------------------------------------------
Efficiencies BEFORE Shielding put into Left Sector
--------------------------------------------------
RUNS Used: 4871-4878 4880-4882 4883 4885-4892
---------- All Deuterium Runs
-------------------------------------
CUTS on Quasi-elastic e'p events
-------------------------------------
-Momentum of Electron abs(pwl-0.725)<0.13
-Vertex abs(zwl)<20.0&&abs(zwr)<20.0&&abs(zwl-zwr)<5.0
-Charge qwl==-1&&qwr==1
-No Cerenkov on Opposite Sector acr<0
-Missing mass of Neutron abs("+mm_L+"-0.9)<0.35
-Loose Phi Cut for noise abs(fwl-fwr+179.7)<30.0
=====================================================
-------------------- RESULTS --------------------
=====================================================
*************************
Efficiencies Left Sector
------------------------
L0: 0.7562 +/- 0.0190 Total Hits: 2777
L1: 0.3028 +/- 0.0307 Total Hits: 1060
L2: 0.5214 +/- 0.0845 Total Hits: 140
**************************
Efficiencies Right Sector
-------------------------
R0: 0.8604 +/- 0.0186 Total Hits: 2901
R1: 0.5626 +/- 0.0276 Total Hits: 1310
R2: 0.3729 +/- 0.0574 Total Hits: 303
*************************************
Total Sector CC Efficiencies
----------------------------
Left Side: 0.6015 +/- 0.0113 Total Hits: 7851
Right Side: 0.7150 +/- 0.0106 Total Hits: 8874
*****************************************************
=====================================================
*****************************************************
=====================================================
*****************************************************
!!!!!!!!!!!!!!!! AFTER Shielding !!!!!!!!!!!!!!!!!
--------------------------------------------------
Efficiencies AFTER Shielding put into Left Sector
--------------------------------------------------
RUNS Used: 5028-5030 5038-5044 5046-5050
---------- All Deuterium Runs
-----------------------------------------------------
CUTS on Quasi-elastic e'p events -SAME AS BEFORE...
-----------------------------------------------------
-Momentum of Electron abs(pwl-0.725)<0.13
-Vertex abs(zwl)<20.0&&abs(zwr)<20.0&&abs(zwl-zwr)<5.0
-Charge qwl==-1&&qwr==1
-No Cerenkov on Opposite Sector acr<0
-Missing mass of Neutron abs("+mm_L+"-0.9)<0.35
-Loose Phi Cut for noise abs(fwl-fwr+179.7)<30.0
=====================================================
-------------------- RESULTS --------------------
=====================================================
*************************
Efficiencies Left Sector
------------------------
L0: 0.8400 +/- 0.0216 Total Hits: 2137
L1: 0.7791 +/- 0.0546 Total Hits: 335
L2: 0.8140 +/- 0.1525 Total Hits: 43
**************************
Efficiencies Right Sector
-------------------------
R0: 0.9326 +/- 0.0212 Total Hits: 2227
R1: 0.9368 +/- 0.0629 Total Hits: 253
R2: 0.7556 +/- 0.1491 Total Hits: 45
******************************
Total Sector CC Efficiencies
------------------------------
Left Side: 0.8253 +/- 0.0139 Total Hits: 5185
Right Side: 0.9106 +/- 0.0141 Total Hits: 5047
*****************************************************
--------------------------------------------------------------------------
Eugene Geis
PhD Student, Physics Department, ASU
Research Affiliate, MIT-Bates Laboratory of Nuclear Science
eugene.geis@asu.edu
--------------------------------------------------------------------------
-------------------------------water is good------------------------------
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