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Charge Symmetry Breaking in Light Hypernuclei
I will focus on charge symmetry breaking in light Lambda hypernuclei. The large value of Lambda hyperon binding energy difference of the A=4 mirror hypernuclei represents one of the long standing important and unresolved issues in hypernuclear physics. Many theoretical attempts were made to reproduce it's value in terms of charge symmetry breaking in hyperon masses and in hyperon-nucleon interactions. I will discuss our recent large-scale no-core shell model calculations of Lambda-4-Helium and Lambda-4-Hydrogen based on chiral nucleon-nucleon and hyperon-nucleon interactions. I will show that inclusion of charge-symmetry breaking hyperon-nucleon interactions induced by electromagnetic Lambda-Sigma mixing is capable of generating sizable charge symmetry breaking in A=4 hypernuclei.