The underlying reason for matter dominance in the universe lies in the violation of CP symmetry, introduced to the SM by Kobayashi and Maskawa by proposing a six-quark model, which resulted in them winning the Nobel Prize for Physics in 2008. The proof of this fundamental achievement was made possible by the KEKB accelerator, located in Japan: a B-factory producing abundant B-mesons, which, decaying into other lighter mesons, are excellent candidates for investigating CP violation. KEKB is an asymmetric electron-positron collider with 10.58 GeV centre-of-mass energy, i.e. at Y(4s) resonance. The challenge today is to perform increasingly precise measurements of weak interaction parameters, which lurk the secrets to formulating physics beyond the SM.