CKM matrix and standard-model CP violation

Abstract

The currently favored model of CP violation is based on phases in the Cabibbo-Kobayashi-Maskawa (CKM) matrix describing the weak charge-changing couplings of quarks. The present status of parameters of this matrix is described. Tests of the theory, with particular emphasis on the study of B meson decays, are then noted. Some remarks are made regarding the possible origin of the baryon asymmetry of the universe; the corresponding coupling pattern of the leptons could shed light on the question. Some possibilities for non-standard physics are discussed.

CKM $\gamma$ measurements at LHCb

“…The CKM matrix elements, denoted as 𝑉 𝑖 𝑗 , represent the strength of flavour-changing weak interactions [1]. 𝐶𝑃-violation arises from the complex phases of these CKM elements [2,3]. The CKM angle 𝛾 ≡arg(…”

Overview of time-integrated $C\!P$ violation in beauty-hadron decays

“…A key test of the SM consistency is to verify the unitarity conditions by constraining the CKM matrix with various independent measurements. The magnitudes of the CKM matrix elements are measured from the decay rates of flavor-changing transitions, while the CKM phases are determined through the measurements of 𝐶𝑃 asymmetries [2,3]. The angle 𝛾 ≡ 𝑎𝑟𝑔[−(𝑉 𝑢𝑑 𝑉 * 𝑢𝑏 )/(𝑉 𝑐𝑑 𝑉 * 𝑐𝑏 )] play an interesting role since it is the only CKM angle that can be measured in tree-level decays, where the interpretation of physical observables (rates and 𝐶𝑃 asymmetries) is affected by negligible theoretical uncertainties, at the order of 10 −7 [4].…”