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Constraining <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>C</mml:mi><mml:mi>P</mml:mi><mml:mi>T</mml:mi></mml:math> violation with Hyper-Kamiokande and ESSnuSB
$CPT$ invariance is one of the most fundamental symmetries in nature and it plays a major role in the formulation of quantum field theory. Although no definitive signal of $CPT$ violation has been observed so far, there are many reasons to carefully investigate various low-energy phenomena that can provide better …