Getting beta-alpha without penguins

TL;DR

This paper proposes a novel method using D0 decay asymmetries in B0 decays to precisely measure the phase difference delta, avoiding penguin process complications and requiring large B-meson samples.

Contribution

It introduces a new approach combining CP eigenstate and inclusive D0 decays to determine delta cleanly, enhancing measurement accuracy.

Findings

CP asymmetry <=40% for non-CP eigenstates

CP asymmetry <=80% for CP eigenstates

Requires about 10^8-10^9 B-mesons for accurate delta measurement

Abstract

Oscillation effects in B0 -> Ks D0 and related processes are considered to determine delta=beta-alpha+pi. We suggest that D0 decays to CP eigenstates used in concert with inclusive D0 decays provide a powerful method for determining delta cleanly i.e. without any complication from penguin processes. The CP asymmetry is expected to be <=40% for D0 decays to non-CP eigenstates and <=80% for decays to CP eigenstates. This method can lead to a fairly accurate determination of delta with O(10^8-10^9) B-mesons.