Uncovering CP Violation: Experimental Clarification in the by Konrad Kleinknecht

By Konrad Kleinknecht

Description of experiments that exposed the character of CP violation and the phenomenology describing CP violation. the writer Konrad Kleinknecht acquired the Leibniz award of the Deutsche Forschungsgemeinschaft 1990 and the Gentner-Kastler prize and medal of SFP and DPG 2001.

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Extra info for Uncovering CP Violation: Experimental Clarification in the Neutral K Meson and B Meson Systems

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The magnetic spectrometer was followed by a scintillator hodoscope, composed of two planes segmented into horizontal and vertical strips. Fast logic combine the strip signals (arranged in four quadrants) for use in the first level of the π + π − trigger, with a time resolution of 200 ps. A liquid-krypton (LKr) calorimeter was used to reconstruct K → 2π 0 decays. This was a quasi-homogeneous detector with an active volume of ∼10 m3 of liquid krypton. Cu–Be–Co ribbon electrodes of size 40 µm × 18 mm × 125 cm defined 13212 cells (each with a 2 cm × 2 cm cross section) in a structure of longitudinal projective towers pointing to the center of the decay region.

Experiments are consistent with V–A interactions and the absence of the other interactions. The hadron current Sλ can then be decomposed unambiguously into a vector part S Vλ and an axial-vector part S A : λ Sλ = SλV + SλA . 60) With the convention that the relative parity of the K and π mesons is + 1, the Kl3 decays are governed by the matrix element of S V , while the Kπ2 λ 36 5 The Neutral K Meson System decays are related to the axial-vector part S A . 61) where l denotes a lepton (muon or electron).

CP violation in the mixing, if |q/p| = 1, called “indirect CP violation”. 2. 39) is not valid, called “direct CP violation”. 3. 40) is not zero. These three types of CP violation are characterized by the following details: 1. CP violation in the mixing . e. if |q/p| = 1 (or ε = 0) and if there is a relative phase between M12 and Γ12 . For the neutral kaon system, this is evident from the existence of the decay KL → π + π − , where |ε| ∼ 2 × 10−3 , and from the charge asymmetry in semileptonic decays δL which is proportional to 2 e ε.

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