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<p>We apply the effective field theory formalism that was used to study CP violation induced by heavy new physics in the <i>τ</i> → <i>K</i><sub><i>S</i></sub><i>πν</i><sub><i>τ</i></sub> decays to the other two-meson tau decay channels. We focus on the rate and the forward-backward asymmetries, that are predicted using current bounds on the complex Wilson coefficients of the effective Lagrangian. We discuss our outcomes for the modes with (<i>K</i>/<i>π</i>)<i>π</i><sup>0</sup> and <i>KK</i><sub><i>S</i></sub>, that can be studied at Belle-II and a super-tau-charm facility. Our main finding is that current and forthcoming experiments would be sensitive to the maximum allowed CP rate asymmetry in the <i>K</i><sup>±</sup><i>K</i><sub><i>S</i></sub> modes if a precision of 5% is reached on this observable, that can check as well the BaBar anomaly in <i>K</i><sub><i>S</i></sub><i>π</i>. For the <i>π</i><sup>±</sup><i>π</i><sup>0</sup> channels, new physics would be difficult to probe at present. Disentangling new sources of CP violation would be most challenging in <i>K</i><sup>±</sup><i>π</i><sup>0</sup> and the other modes.</p>

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CP violation in two-meson Tau decays induced by heavy new physics

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年1月21日

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  • Daniel A. López Aguilar,
  • Javier Rendón,
  • Pablo Roig

摘要

We apply the effective field theory formalism that was used to study CP violation induced by heavy new physics in the τ → KSπντ decays to the other two-meson tau decay channels. We focus on the rate and the forward-backward asymmetries, that are predicted using current bounds on the complex Wilson coefficients of the effective Lagrangian. We discuss our outcomes for the modes with (K/π)π0 and KKS, that can be studied at Belle-II and a super-tau-charm facility. Our main finding is that current and forthcoming experiments would be sensitive to the maximum allowed CP rate asymmetry in the K±KS modes if a precision of 5% is reached on this observable, that can check as well the BaBar anomaly in KSπ. For the π±π0 channels, new physics would be difficult to probe at present. Disentangling new sources of CP violation would be most challenging in K±π0 and the other modes.