The phase of ηoo and the invariances CPT and T

Schubert, K. R.; Wolff, B.; Gaillard, J. M.; Jane, M.R.; Ratcliffe, Toby; Repellin, J. P.

doi:10.1016/0370-2693(70)90029-8

Cited by 70 publications

(46 citation statements)

References 12 publications

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“…Our results on Re( ) and Im(δ) are almost one order of magnitude more accurate than those of a previous similar analysis [4] owing to improvements in the accuracy of various measurements where CPLEAR has made significant contributions. The fact that Re( ) and Im(δ) are essentially determined through the Bell-Steinberger relation allows Re(y) to be obtained explicitly: a result which could not be achieved from semileptonic data alone.…”

Section: Results and Systematic Errorssupporting

confidence: 55%

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Determination of the T- and CPT-violation parameters in the neutral-kaon system using the Bell–Steinberger relation and data from CPLEAR

Apostolakis

Aslanides

Backenstoss³

et al. 1999

Physics Letters B

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Determination of the T-and CPT-violation parameters in the neutral-kaon system using theBell-Steinberger relation and data from CPLEAR. CPLEAR CollaborationA. Apostolakis 1) , E. Aslanides 11) , G. Backenstoss 2) , P. AbstractData from the CPLEAR experiment, together with the most recent world averages for some of the neutral-kaon parameters, were constrained with the Bell-Steinberger (or unitarity) relation, allowing the T-violation parameter Re( ) and the CPT-violation parameter Im(δ) of the neutral-kaon mixing matrix to be determined with an increased accuracy:−5 . Moreover, the constraint allows the CPT-violation parameter for the neutralkaon semileptonic decays, Re(y), to be determined for the first time. The ∆S = ∆Q parameters Re(x − ) and Im(x + ) are given with an increased accuracy. The quantity Re(y + x − ), which enters the T-violation CPLEAR asymmetry previously published, is determined to be (0.2 ± 0.3) × 10 −3 . The value obtained for Re(δ) is in agreement with the one resulting from a previous unconstrained fit and has a slightly smaller error. (Submitted to Physics Letters B) IntroductionThe CPLEAR experiment has directly measured for the first time the violation of T invariance in the neutral-kaon system [1] and has provided a new, more accurate limit for the CPT-violation parameter Re(δ) [2]. These results were obtained by analysing the rate asymmetries between K 0 and K 0 for decays to e ± π ∓ ν, as a function of the decay time t = τ .In continuation of this work we have studied the constraints on our results deriving from the Bell-Steinberger (or unitarity) relation [3][4][5]. The Bell-Steinberger relation relates all decay channels of neutral kaons to the parameters describing T and CPT non-invariance. With the present precision of the two-pion decay parameters the dominant uncertainties arise from the three-pion and semileptonic decays. Moreover, the semileptonic decays enter the relation with the parameter Re(y), describing CPT violation in semileptonic decays and as yet not measured. Having improved the precision of three-pion decays [7,8] and measured precisely the semileptonic decay rates, CPLEAR allows the determination of all parameters with an unprecedented accuracy. We stress here that they are obtained free of theoretical assumptions, apart from unitarity, unlike others obtained previously also using the unitarity relation [6].

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Section: Results and Systematic Errorssupporting

confidence: 55%

“…In continuation of this work we have studied the constraints on our results deriving from the Bell-Steinberger (or unitarity) relation [3][4][5]. The Bell-Steinberger relation relates all decay channels of neutral kaons to the parameters describing T and CPT non-invariance.…”

Section: Introductionmentioning

confidence: 99%

Determination of the T- and CPT-violation parameters in the neutral-kaon system using the Bell–Steinberger relation and data from CPLEAR

Apostolakis

Aslanides

Backenstoss³

et al. 1999

Physics Letters B

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“…Since the measurements yield φ ππ ≈ φ SW , the CP violation is a T violation with CPT invariance [7]. We will later consider the hypothetical outcome φ ππ ≈ φ SW + π/2, which would signal a CP violation with T invariance and CPT violation.…”

Section: Unitaritymentioning

confidence: 99%

The fundamental symmetries in the neutral kaon system—a pedagogical choice

Fidecaro

Gerber²

2006

Rep. Prog. Phys.

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During the recent years experiments with neutral kaons have yielded remarkably sensitive results which are pertinent to such fundamental phenomena as CPT invariance (protecting causality), time-reversal invariance violation, coherence of wave functions, and entanglement of kaons in pair states. We describe the phenomenological developments and the theoretical conclusions drawn from the experimental material. An outlook to future experimentation is indicated.

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“…Rewriting Eq. (5) in the K S −K L basis, we derive the well known Bell-Steinberger relation 29,30 relating all decay channels of neutral kaons to the parameters describing T and CPT non-invariance in the neutral kaon mixing:…”

Section: T and Cpt Parameters Constrained By The Unitarity Relationmentioning

confidence: 99%

Measurements of Discrete Symmetries in the Neutral Kaon System with the CPLEAR (PS195) Experiment

Ruf

2015

Advanced Series on Directions in High Energy Physics

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The antiproton storage ring LEAR offered unique opportunities to study the symmetries which exist between matter and antimatter. At variance with other approaches at this facility, CPLEAR was an experiment devoted to the study of T , CPT and CP symmetries in the neutral kaon system. It measured with high precision the time evolution of initially strangeness-tagged K 0 and K 0 states to determine the size of violations with respect to these symmetries in the context of a systematic study. In parallel, limits concerning quantum-mechanical predictions (EPR paradox, coherence of the wave function) or the equivalence principle of general relativity have been obtained. This article will first discuss briefly the unique low energy antiproton storage ring LEAR followed by a description of the CPLEAR experiment, including the basic formalism necessary to understand the time evolution of a neutral kaon state and the main results related to measurements of discrete symmetries in the neutral kaon system. An excellent and exhaustive review of the CPLEAR experiment and all its measurements is given in Ref. 1.

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The phase of ηoo and the invariances CPT and T

Cited by 70 publications

References 12 publications

Determination of the T- and CPT-violation parameters in the neutral-kaon system using the Bell–Steinberger relation and data from CPLEAR

Determination of the T- and CPT-violation parameters in the neutral-kaon system using the Bell–Steinberger relation and data from CPLEAR

The fundamental symmetries in the neutral kaon system—a pedagogical choice

Measurements of Discrete Symmetries in the Neutral Kaon System with the CPLEAR (PS195) Experiment

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