Diagnostic for new physics in B→πK decays

Abstract

A recent analysis of B → πK decays concludes that present data do not clearly indicate whether (i) the standard model (or ∆I = 0 new physics) is sufficient, or (ii) ∆I = 1 new physics is needed. We show that these two possibilities can be distinguished by whether a sum rule relating the CP asymmetries of the four B → πK decays is valid. If case (i) is favored, the sum rule holds, and one predicts A CP (π 0 K 0 ) = −0.15, while in case (ii) fits to new physics involving large values of a colorsuppressed tree amplitude entail A CP (π 0 K 0 ) = −0.03. The current experimental average A CP (π 0 K 0 ) = −0.01 ± 0.10 must be measured a factor of at least three times more precisely in order to distinguish between the two cases.

Standard model with four generations: Selected implications for rareBandKdecays

“…[115][116][117] that these corrections generally tend to increase S Kπ 0 from its pure penguin limit of (sin 2β) by a modest amount i.e., S π 0 Ks ≈ 0.8. Recently, using isospin symmetry it has been shown in [118][119][120] that the standard model favors a large S π 0 Ks ≈ 0.99.…”

The use of adversaries for optimal neural network training

“…The most recent Belle measurement is A CP (K 0 π 0 ) = +0.14±0.13(stat)±(0.06)(sys) [4], where the majority of the statistical uncertainty is due the large background to signal ratio. By combining measurements of all K → Kπ charge states, Beak et al [5] predict that A CP (K 0 π 0 ) = −0.15 ± 0.03 and that a 5-σ deviation from this value would demonstrate that the effects of New Physics make an unambiguous effect on this mode. Accordingly, the most precise measurements for A CP (K 0 π 0 ) are vital.…”

Observation of the Decay Ξb−→pK−K−Aaij1, Adeva2, Adinolfi3 et al. 2017Phys. Rev. Lett.11010View full textAdd to dashboardCite

“…Even larger CP-violation effects have been observed in regions of the phase space of [5][6][7]. A number of theoretical approaches [8][9][10][11][12][13][14][15][16][17][18] have been proposed to determine whether the observed effects are consistent with being solely due to the nonzero phase in the quark mixing matrix [19,20] of the standard model, or whether additional sources of asymmetry are contributing.…”