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Low energy photonuclear $K^{+/-}$ events have emerged as one of the mostdifficult backgrounds for the LDMX detector to veto. This report discusses anextended study of the properties of soft kaons in the ECal, using a GEANT4particle gun to combat the low statistics of these events. Simulations revealthat the most dangerous events are those in which a kaon decays before reachinga silicon detector layer. Threshold values are determined for the parameters ofthe most dangerous kaon events. A study of an enhanced photonuclear sample isanalyzed to understand the kinematics of typical and dangerous events. Atheoretical model for energy loss is incorporated for corroboration and toprovide further predictions. The results of the three approaches of study areshown to provide complimentary predictions. A key result is that events with$E_k > 200$ MeV and $\theta < 60^\circ$ are expected to produce a 3-hit trackin at least 95\% of cases, while events on the other side of this thresholdwill be expected to produce fewer than 3 hits in about 40\% of all cases.

Studying the Properties of Soft Kaons in the LDMX ECal