Measurement of the neutral kaon regeneration amplitude in carbon at momenta below 1 Gev/c

Angelopoulos, A.; Apostolakis, A.; Aslanides, E.; Backenstoss, G.; Bargassa, P.; Behnke, O.; Benelli, A.; Bertín, V.; Blanc, F.; Bloch, P.; Carlson, P.; Carroll, M.; Carvalho, J.; Cawley, E.; Charalambous, S.; Chardin, G.; Chertok, M.; Cody, Ann Marie; Danielsson, Mats; Déjardin, M.; Derré, J.; Ealet, A.; Eleftheriadis, C.; Evangelou, I.; Faravel, L.; Fetscher, W.; Fidecaro, M.; Filipčić, A.; Francis, D.; Fry, J. R.; Gabathuler, E.; Gamet, R.; Garreta, D.; Gerber, H.J.; Go, A.; Haselden, A.; Hayman, P.; Henry‐Couannier, F.; Hollander, R.W.; Hubert, E.; Jon‐And, K.; Kettle, P.R.; Kokkas, P.; Kreuger, R.; Gac, R. Le; Leimgruber, F.; Liolios, A.; Machado, E.; Mandić, I.; Manthos, N.; Marel, G.; Mikuž, M.; Miller, J.; Montanet, F.; Müller, A.; Nakada, T.; Pagels, B.; Papadopoulos, I.; Pavlopoulos, P.; Cunha, J. Pinto da; Policarpo, A.; Polivka, G.; Rickenbach, R.; Roberts, B. L.; Ruf, T.; Sakeliou, L.; Sanders, P.; Schäfer, M.; Schaller, L.A.; Schietinger, T.; Schopper, A.; Soares, A.; Tauscher, L.; Thibault, C.; Touchard, F.; Touramanis, C.; Triantis, F. A.; Beveren, Eef van; Eijk, C.W.E. van; Vlachos, S.; Weber, Peter M.; Wigger, O.; Wolter, M. W.; Yèche, Ch; Zavrtanik, D.; Zimmerman, D.

doi:10.1016/s0370-2693(97)01193-3

Cited by 27 publications

(15 citation statements)

References 18 publications

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“…Regeneration was corrected on an event-by-event basis using the amplitudes measured by CPLEAR [96], depending on the momentum of the neutral kaon and on the positions of its production and decay vertices. Typically, this correction amounts to a positive shift of the asymmetry A exp T of 0.3 × 10 −3 with an error dominated by the amplitude measurement.…”

Section: Weighting Eπν Events and Building Measured Asymmetriesmentioning

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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Section: Weighting Eπν Events and Building Measured Asymmetriesmentioning

confidence: 99%

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

Fidecaro

Gerber²

2006

Rep. Prog. Phys.

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“…A dedicated experimental setup had been used to improve the knowledge on regeneration amplitudes, magnitudes and phases, in the momentum range relevant for the CPLEAR experiment. 4 The effect is being corrected for by applying a weight to each K 0 (K 0 ) event equal to the ratio of the decay probabilities for an initial K 0 (K 0 ) propagating in vacuum and through the detector.…”

Section: The Cplear Experimental Methodsmentioning

confidence: 99%

“…Whenever the LEAR machine was ready to take a shot (≈ 5 × 10 9 ) of p , the AA released a part of its stack to the PS, where the p 's were decelerated to 609 MeV/c , injected into LEAR, and stochastically cooled down for another 5 min to a momentum spread of σ p /p = 10 −3 . This was followed by electron cooling, resulting in a relative momentum spread of only 5×10 − 4 . LEAR had been equipped with fast and ultra-slow extraction systems, the latter being used for the CPLEAR experiment providing a rate of 1 MHz antiprotons in spills of about 1 h. The last part of extraction line comprised two horizontal and two vertical bending magnets followed by a quadrupole doublet to align and focus the beam on the target in the centre of the detector.…”

Section: The Low Energy Antiproton Ringmentioning

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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“…Each event selected, labeled by the initial kaon strangeness and the decay electron charge, was then properly weighted before forming the numbers N of events entering the asymmetries A Weighting eπν events and building measured asymmetries Regeneration was corrected on an event-by-event basis using the amplitudes measured by CPLEAR [92], depending on the momentum of the neutral kaon and on the positions of its production and decay vertices. Typically, this correction amounts to a positive shift of the asymmetry A exp T of 0.3 × 10 −3 with an error dominated by the amplitude measurement.…”

Section: Selection Of Eπν Eventsmentioning

confidence: 99%

Plate with a hole obeys the averaged null energy condition

Graham

Olum

2005

Phys. Rev. D

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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), timereversal 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.

show abstract

Measurement of the neutral kaon regeneration amplitude in carbon at momenta below 1 Gev/c

Cited by 27 publications

References 18 publications

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

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

Plate with a hole obeys the averaged null energy condition

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