Measurements of the CKM Angle beta/phi_1 at B Factories

TL;DR

This paper reviews precise measurements of the CKM angle beta/phi_1 at B Factories, highlighting results from various decay modes and discussing potential signs of new physics in penguin-dominated processes.

Contribution

It provides a comprehensive review of beta/phi_1 measurements across multiple decay channels, including recent results and implications for new physics.

Findings

High-precision measurement of beta/phi_1 in B0->(ccbar)K0 channels

Hints of deviations in charmless modes suggesting possible new physics

Comparison of tree and penguin decay measurements

Abstract

We present a review of the measurements of the CKM angle beta (phi_1) by the BaBar and Belle experiments at the asymmetric-energy e+e- B Factories PEP-II and KEKB. The angle beta (phi_1) is measured by time-dependent CP analyses of neutral B meson decays in a Upsilon(4S)->BBbar system, where one B meson is fully reconstructed in a final state that can be accessed to by both B0 and B0bar, usually a CP eigenstate. This angle has been measured at a high precision through B0-> (ccbar)K0 channels. We also review another tree-dominated decay B0-> D(*)0 h0 (h0 = pi0, eta^{'}, omega); tree decays with penguin pollutions, B0->D(*)+-D-+$ and J/psi pi0; and penguin dominated modes, B0-> eta^'K0, K+K-K0, and KsKsKs. A hint of sin2beta (sin2phi_1) in charmless modes less than (ccbar)K0 modes still persists, which may be an indication of possible new physics entering the loop in the penguin diagram.