Abstract
We study the KS0 − KL0 asymmetries and CP violations in charm-baryon decays with neutral kaons in the final state. The KS0 − KL0 asymmetry can be used to search for two-body doubly Cabibbo-suppressed amplitudes of charm-baryon decays, with the one in Λc+ → pKS, L0 as a promising observable. Besides, it is studied for a new CP-violation effect in these processes, induced by the interference between the Cabibbo-favored and doubly Cabibbo-suppressed amplitudes with the neutral kaon mixing. Once the new CP-violation effect is determined by experiments, the direct CP asymmetry in neutral kaon modes can then be extracted and used to search for new physics. The numerical results based on SU(3) symmetry will be tested by the experiments in the future.
Highlights
CP asymmetryCP violation can occur in the charm decays into neutral kaons, induced by the interference between the CF and doubly Cabibbo-suppressed (DCS) amplitudes with the K0−K0 mixing
JHEP03(2018)066 violation compared to the SM prediction [31,32,33,34]
In the charmed hadron decays into neutral kaons, the interference between the Cabibbofavored (CF) and the doubly Cabibbo-suppressed (DCS) amplitudes leads to the KS0 − KL0 asymmetry, an observable to search for the DCS transitions
Summary
CP violation can occur in the charm decays into neutral kaons, induced by the interference between the CF and DCS amplitudes with the K0−K0 mixing. AiCnPt (t) has been missed in the literature of studying D meson decays [31, 34, 46,47,48] in which the DCS amplitudes are assumed to be zero, and was first pointed out in [49] as a new CP -violation effect. It arises from the mother decay and the daughter mixing.
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