Showing papers by "P. Pavlopoulos published in 1996"
01 Sep 1996-Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment
TL;DR: The CPLEAR detector at CERN was used for CP-, T- and CPT-symmetry studies using K 0 and K 0 produced by the annihilation of p's in a hydrogen gas target as mentioned in this paper.
Abstract: The CPLEAR collaboration has constructed a detector at CERN for an extensive programme of CP-, T- and CPT-symmetry studies using K 0 and K 0 produced by the annihilation of p 's in a hydrogen gas target. The K 0 and K 0 are identified by their companion products of the annihilation K ± π ∓ which are tracked with multiwire proportional chambers, drift chambers and streamer tubes. Particle identification is carried out with a liquid Cherenkov detector for fast separation of pions and kaons and with scintillators which allow the measurement of time of flight and energy loss. Photons are measured with a lead/gas sampling electromagnetic calorimeter. The required antiproton annihilation modes are selected by fast online processors using the tracking chamber and particle identification information. All the detectors are mounted in a 0.44 T uniform field of an axial solenoid of diameter 2 m and length 3.6 m to form a magnetic spectrometer capable of full on-line reconstruction and selection of events. The design, operating parameters and performance of the subdetectors are described.
42 citations
CERN1
TL;DR: In this article, a new method for measuring the difference between the forward scattering amplitudes for K0 and K€ 0 was proposed by using decay rates of initially pure strangeness states after passage through a regenerator.
Abstract: We propose a new method for measuring the difference
$$\Delta f = f(0) - \bar f(0)$$
of the forward scattering amplitudes for K0 and
$$\bar K^0 $$
by use of decay rates of initially pure strangeness states after passage through a regenerator. The phenomenology of coherent kaon regeneration is presented for arbitrary mixtures of K0 and
$$\bar K^0 $$
.
23 citations
National and Kapodistrian University of Athens1, University of the Mediterranean2, University of Liverpool3, Paul Scherrer Institute4, University of Fribourg5, CERN6, Royal Institute of Technology7, University of Coimbra8, Aristotle University of Thessaloniki9, DSM10, Boston University11, University of Ioannina12, University of Ljubljana13, Delft University of Technology14, Centre national de la recherche scientifique15
TL;DR: In this article, the best estimation of ϕ +− (the phase of the CP violation parameter η +− ) and of Δm (the K L - K S mass difference) is obtained by averaging the results of different experiments, taking into account the different correlation, existing for most of the experiments, between the measurement of η+− and Δm.
20 citations
University of the Mediterranean1, National and Kapodistrian University of Athens2, University of Liverpool3, University of Fribourg4, Paul Scherrer Institute5, CERN6, Royal Institute of Technology7, University of Coimbra8, Aristotle University of Thessaloniki9, DSM10, Boston University11, University of Ioannina12, University of Ljubljana13, Delft University of Technology14, Centre national de la recherche scientifique15
TL;DR: In this paper, the authors measured the time-dependent rate asymmetry of initial K0 and K 0 decaying into π+π−π0 was measured in order to reveal the CP-violating amplitude of the initial K 0 → π +π−−π 0 decay.
14 citations
University of the Mediterranean1, National and Kapodistrian University of Athens2, University of Liverpool3, Paul Scherrer Institute4, University of Fribourg5, CERN6, Royal Institute of Technology7, University of Coimbra8, Aristotle University of Thessaloniki9, DSM10, Boston University11, University of Ioannina12, University of Ljubljana13, Delft University of Technology14, Centre national de la recherche scientifique15
TL;DR: In this paper, the decay rate asymmetries between initial K 0 and K 0 separately for the phase space regions E CM ( π + ) > E CM( π − ) and ECM (π + ) ECM(π − ).
10 citations
TL;DR: In this article, a time-dependent rate asymmetry between the decays of the neutral kaons was observed, where the neutral kons are produced with definite and individually known strangeness in the environment.
Abstract: CP violation has been observed as a time-dependent rate asymmetry between the decays ${⩈erline K}^0 ⌝ghtarrow ≪^{0} ≪^{0}$ and K0 → π0π{0}, where the neutral kaons are produced with definite and individually known strangeness in ${⋏r p}p ⌝ghtarrow{⩈erline K}^0 K^+≪^- $ or pp → K0 K− π+. A special technique for the data analysis has been developed. The values obtained for ϕ00 and ¦ η00¦ are in agreement with those of previous measurements of CP violation.
5 citations
University of the Mediterranean1, National and Kapodistrian University of Athens2, University of Liverpool3, University of Fribourg4, Royal Institute of Technology5, University of Coimbra6, Aristotle University of Thessaloniki7, DSM8, Boston University9, University of Ioannina10, University of Ljubljana11, Delft University of Technology12, Centre national de la recherche scientifique13
TL;DR: The CPLEAR experiment at CERN studies the CP, T and CPT symmetries in the neutral-kaon system by measuring the rate asymmetries between the decays of initially pure K0 and δm as discussed by the authors.
Abstract: The CPLEAR experiment at CERN studies theCP, T andCPT symmetries in the neutral-kaon system by measuring the rate asymmetries between the decays of initially pure K0 and
$$\overline {K^0 } $$
states. Using data taken between 1990 and mid 1994, precise measurements of |η+-|,φ
+- and Δm are reported. The comparison of φ+- the superweak phase gives one of the most sensitive tests ofCPT invariance and leads to a new limit on the
$$K^0 - \overline {K^0 } $$
mass difference.