Trigger Statistics Page

Trigger Statistics for Selected Modes in Two-photon Physics

New results from SP MC samples for two-photon -> pi0 pi0 (SP7622), eta pi0 (SP7623), and eta eta (SP7624)

SP9 MC sample	SP7622_Run6_On	SP7623_Run6_On	SP7624_Run6_On
Total number events:	111000	111000	111000
Overall L1 efficiency	97.159% +- 0.050%	98.563% +- 0.036%	99.495% +- 0.021%
Pure DCT	1.284% +- 0.034%	1.360% +- 0.035%	1.241% +- 0.033%
Pure EMT	97.050% +- 0.051%	98.501% +- 0.036%	99.449% +- 0.022%
Mixed	13.320% +- 0.102%	13.253% +- 0.102%	11.692% +- 0.096%

Failed L1	2.841% +- 0.050%	1.437% +- 0.036%	0.505% +- 0.021%
Prescaled only	0.062% +- 0.007%	0.031% +- 0.005%	0.013% +- 0.003%
Pure DCT only	0.002% +- 0.001%	< 0.003% (95% C.L.)	< 0.003% (95% C.L.)
Pure EMT only	81.101% +- 0.118%	82.631% +- 0.114%	84.942% +- 0.107%
Mixed only	0.036% +- 0.006%	0.027% +- 0.005%	0.032% +- 0.005%

SP9 MC sample	SP7622_Run5_On	SP7623_Run5_On	SP7624_Run5_On
Total number events:	224000	224000	224000
Overall L1 efficiency	97.095% +- 0.035%	98.576% +- 0.025%	99.463% +- 0.015%
Pure DCT	1.554% +- 0.026%	1.635% +- 0.027%	1.662% +- 0.027%
Pure EMT	96.977% +- 0.036%	98.487% +- 0.026%	99.404% +- 0.016%
Mixed	12.253% +- 0.069%	12.490% +- 0.070%	10.982% +- 0.066%

Failed L1	2.905% +- 0.035%	1.424% +- 0.025%	0.537% +- 0.015%
Prescaled only	0.071% +- 0.006%	0.049% +- 0.005%	0.026% +- 0.003%
Pure DCT only	0.005% +- 0.002%	0.003% +- 0.001%	0.001% +- 0.001%
Pure EMT only	76.343% +- 0.090%	68.837% +- 0.098%	66.047% +- 0.100%
Mixed only	0.027% +- 0.003%	0.028% +- 0.004%	0.023% +- 0.003%

SP8 MC sample	SP7622_Run5_On	SP7623_Run5_On	SP7624_Run5_On
Total number events:	224000	224000	224000

Using Rainer's tool announced in this HN.

gamma* gamma* -> pi+ pi- signal MC (run4 [1000 events], run5[1000 events], and for all runs 1-5 [129000 events]). Now break down into different W regions with 1000 events generated for each sample unless otherwise noted:
- W=[1.1, 2.1] (run4 and run5)
- W=[2.1, 3.1] (run4 and run5)
- W=[3.1, 6.0] (run4 and run5)
- using SP-5936 collection for run1-5 in W < 3.0 region [39978/129000 events passed] (note that the miminum W seems to be 2.4 in this collection)
gamma* gamma* -> p+ p- signal MC (5000 events). Now break down into different W regions with 1000 events generated for each sample:
- W=[2.0, 3.0] (Run4 and Run5)
- W=[3.0, 3.7] (Run4 and Run5)
- W=[3.7, 5.0] (Run4 and Run5)
- Using SP-5939 collections (which only have run5 so far): run5 [32000 events] and run5 with W < 3 only [8208/32000 events passed].
gamma* gamma* -> pi0 pi0 signal MC {3.2%} [2000 events]; note that inefficiency is displayed in {}.
- W < 2.5 {15.7%, 16.2%} 8371/34000 events passed. If breaking down further:
  - W < 2 {15.7%, 16.2%} 5676/34000 events passed.
  - W=[2.0, 2.5]{0.5%, 1.1%} 2695/34000 events passed.
- W=[2.5, 3.5]{0.3%, 0%} 5777/34000 events passed
- W > 3.5{0.2%} 19852/34000 events passed
- New MC sample generated from Aug 2006 configuration and condition: W=[0.6, 5] {3.4%} 2000 events.
- 54K events [2.9%] with analysis cuts and constraints etc.for run3 (updated March 2007)
gamma* gamma* -> eta eta signal MC [2000 events]
- 399K events [% inefficient] with analysis cuts and constraints etc.for run5 (updated Apr 2007)
gamma* gamma* -> eta pi0 signal MC [2000 events]
- 399K events [1.4% inefficient] with analysis cuts and constraints etc.for run5 (updated Apr 2007)

Note that the Monte Carlo samples are generated privately unless noted/named after a SP-xxxx.

We require that all final state particles are within the detector acceptance. Here is the ACCEPTANCE CUTS:
CALORIMETER: energy > 0.020 GeV -0.780 < cos(theta) < 0.960
DRIFT CHAMBER: momentum > 0.080 GeV/c -0.930 < cos(theta) < 0.970

Conclusions

Looking at the charged final states, it looks like for run5 is more efficient than run4 in low W region. At high W regions, there is essentially no difference seen in the run4 and run5 configurations.