Searching for New Physics in the b->d FCNC using B_s^0(t)->\phi K_s and B_d^0(t)->K^0\bar{K}^0

TL;DR

This paper proposes using time-dependent decay measurements of B_s^0 and B_d^0 mesons to detect potential new physics in the b->d flavor-changing neutral current by comparing weak phases, which are equal in the standard model.

Contribution

It introduces a method to compare weak phases in B meson decays to identify deviations indicating new physics in b->d FCNC processes.

Findings

Method can detect discrepancies in weak phases suggesting new physics.

Applicable to various decay pairs for broader searches.

Provides a framework for experimental tests of the standard model.

Abstract

Time-dependent measurements of the decays B_s^0(t)-->\phi K_s and B_d^0(t) --> K^0 \bar{K}^0 can be used to compare the weak phases of B_d^0-\bar{B}_d^0 mixing and the t-quark contribution to the b->d penguin. Since these two phases are equal in the standard model, any discrepancy would be a sign of new physics, specifically in the b->d flavour-changing neutral current (FCNC). The method can be applied to other pairs of decays, such as B_s^0(t)--> J/\Psi K_s and B_d^0(t)--> J/\Psi \pi^0.