2020/08/26 by Damir Bečirević, Svjetlana Fajfer, Nejc Košnik +1 · 1 citation
Physics and Astronomy · #hep-ph #hep-ex
paper · pdf · doi:10.1140/epjc/s10052-020-08518-2
Added missing references
arxiv created 2020/08/26 · arxiv updated 2020/10/28
We show that the current values of RKexp and RK^∗exp can be accommodated by allowing a nonzero New Physics coupling δC9μμ to be complex, both in the scenario in which only δC9μμ is affected, and in the scenario with complex δC9,10μμ satisfying δC9μμ=-δC10μμ. A presence of the weak CP-violating phase can then be tested by measuring the CP-asymmetry, ACP. We show that this asymmetry is enhanced around the peak of each c c-resonance, and in fact more pronounced in the close vicinity of J/ψ and ψ(2S). Therefore, measuring ACP before and after the resonances' peak could be revelatory of the CP-violation that originates from beyond the Standard Model, or to be a significant constrain when building a realistic scenario of New Physics.