CPviolation inB-meson decays

Abstract

The pattern of CP violation in the bottom sector is discussed. We introduce general techniques to expose new CPviolating effects in the cascade decays of B mesons. In the Kobayashi-Maskawa (KM) model, the CP asymmetries so obtained range from 2-20 % for plausible values of the model parameters. This is to be compared with the small effects, of order 10-3-10-4, previously exhibited within this model. Effects of this size should be observable in upcoming experiments. Our approach stresses the on-shell transitions which make up the cascade decays of heavy mesons to ordinary hadrons, as opposed to the off-shell transitions which occur in the analogs of KV? mixing. The CP asymmetries generated by our techniques are of order sins, where 8 is the KM phase angle, and thus represent the maximum effects obtainable in this model.

Measurement of branching fractions and charge asymmetries for two-bodyBmeson decays with charmonium

“…Recently, BaBar [1] and Belle [2] have observed large time-dependent CP asymmetries in the neutral B-meson system [3]. Decay modes of neutral B mesons to final states containing charmonia were used for these measurements due to their clean experimental signatures and straightforward theoretical interpretation.…”

Erratum:CPasymmetry, branching ratios, and isospin breaking effects inB→ργandB→ωγdecay

“…We examined these possibilities, and concluded that the subtle excess of the branching ratio mainly comes from (1), and the effects from (2) are very small.…”

“…The standard model (SM) predicts large CP violation in B decays [1,2] and they have been verified in B → J/ψK s [3,4], B → ππ [5,6], and B → DK [7] decays. The quest of high energy physics has always been to search for the most fundamental theory.…”

Theoretical analysis of direct CP violation and differential decay width in $$D^\pm \rightarrow \pi ^\pm \pi ^+\pi ^-$$ D ± → π ± π + π - in phase space around the resonances $$\rho ^0(770)$$ ρ 0 ( 770 ) and $$f_0(500)$$ f 0 ( 500 )

“…Although it is a small effect in general, CP violation can be relatively large in some decay channels of B and B s mesons [3][4][5][6]. In fact, large CP violation has been confirmed in some two-body decay channel of the B and B s meson, such as B ± → D CP(+1) π ± [7], B ± → ρ 0 K ± [8], B ± → ρ 0 K * (892) ± [9], B ± → f 0 (1370)π ± [10], B 0 → ρ − K + [11], and B s → π + K − [12,13].…”