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The need for this detector arose after the analysis of HPS 2015 and 2016 data.
- It turned out that most of Top <-> Bottom cluster pairs from the "pair1" trigger, are the so called Wide Angle Bremsstrahlung (WAB)
- There are significant number of events where electron from the pair, travels through the ECal hole, and hence missing detection.
- At high Esum region, these events are almost equal to the number of events, where the pair electron hit's the ECal.
- Hence recovering these events, will almost double the statistics at high ESum region.
e- gamma events, vs e-e+ events | Trident events, when the electron hit the ECal, and when e- traveled through the ECal hole, and escaped the detection |
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![WABs_and_emep.png](https://lh4.googleusercontent.com/BN-rylpy0XDhSAbnHozv6W9sYGdo3Mn5tX5cYWh5etomH1rMPQH79AYNJLQsSSM71TPwWGaErTHW__FBapmKm-Fqvjl9oY66qj_6ryi7IVl-aItJq0WwV8qWTokcBReeQNGP5Dv30Bk) | ![MC_Trid_PSum_compare_v2.png](https://lh3.googleusercontent.com/9KsNEmv10gBYCSAsxY0OVekpihPBiz1ej6QNKLnfeFWzLdiRmpBBe9zxUHdI5ZqE34QrmwVAMoWjbuG7G4itQtIkrKXLlkHjGrk_hQdmuSD6m5aLE4CnH-7PHac3NQh3LgN8ACTi_Os) |
The Engineering design of the Hodoscope |
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![](https://lh5.googleusercontent.com/vfS4ezuhL948_MVUcXE8118eOAfrGdA-i_2KFmqimmko8wbiLuAPRLdeWTwWJJe4zJg1rxMrFD7HsP7suWEZ7sGmkTJidVwLZt3moF5XUtflLEF4-OwULkaLoWD6D2HhV_v8xcPw-3g) |