B decays into a scalar/tensor meson in pursuit of determining the CKM angle $\gamma$

TL;DR

This paper proposes a novel method to determine the CKM angle gamma using B decays into scalar/tensor mesons, leveraging decay amplitude triangles to achieve large CP asymmetries without hadronic uncertainties, and estimates measurable branching ratios.

Contribution

It introduces a new approach for gamma measurement via B decays into scalar/tensor mesons, avoiding hadronic uncertainties and utilizing amplitude triangles for enhanced CP asymmetry detection.

Findings

Proposed decay channels have branching ratios of 10^{-6} to 10^{-5}.

Method avoids doubly Cabibbo-suppressed D decays.

Potential for measurement at LHCb and future experiments.

Abstract

In this work, I suggest a new way for determining the CKM angle $\gamma$ via B decays into a scalar/tensor meson without any hadronic uncertainty. The proposed idea makes profits of the two triangles formed by the $B^\pm\to (D^0,\bar D^0,D_{CP}^0) K^{*\pm}_{0(2)}(1430)$ decay amplitudes. The advantages in it are large CP asymmetries and the avoidance of the use of doubly Cabibbo-suppressed D decays. Branching ratios of $B^\pm\to (D^0,\bar D^0,D_{CP}^0) K^{*\pm}_{0(2)}(1430)$ are estimated to have the order $10^{-6}-10^{-5}$ and therefore measurable by the ongoing LHCb experiment and future experimental facilities. The usefulness of other related channels, for instance the neutral $B_d$ decays into $DK^{*}_{0(2)}(1430)$ and $B_s\to (D^0, \bar D^0) M$ ($M=f_0(980),f_0(1370), f_2'(1525), f_1(1285), f_1(1420), h_1(1180))$, the $B\to D^{\mp} a_{0,2}^{\pm}$ for the extraction of $\gamma+2\beta$ and the $B_s\to D^{\mp} K_{0,2}^{*\pm}$ to access $\gamma+2\beta_s$, is also discussed in brevity.