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analysis of the semileptonic decays of the neutral kaons

Andrew M. Cody

analysis of the semileptonic decays of the neutral kaons

by Andrew M. Cody

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Published by University College Dublin in Dublin .
Written in English

    Subjects:
  • Kaons -- Decay.

  • Edition Notes

    Statementby Andrew M. Cody.
    ContributionsUniversity College Dublin. Department of Experimental Physics.
    The Physical Object
    Paginationxiii, 116p. :
    Number of Pages116
    ID Numbers
    Open LibraryOL22189823M

    13 4 CPT violation — could it be in K and B decays? 6 Equality of masses and lifetimes Theoretical scenarios CPT phenomenology for neutral kaons Semileptonic decays Asymmetries Non-leptonic neutral K decays Harnessing EPR correlations q factory The strangeness content of neutral kaon states can be alternatively determined by ob-serving their semileptonic decay modes. Indeed, these semileptonic decays obey the well tested ∆S = ∆Q rule which allows the modes K0(¯sd) → π−(¯ud) + l+ + ν l, K¯0(sd¯) → π+(ud¯) + l− + ¯ν l, ().

    Phenomenological Analysis 37 Parameter Values 37 Analysis of the Measurement of \e\ 38 Combined Analysis of e and x d 39 Conclusions 43 Chapter 3 Semileptonic Decays 47 Introduction 47 Four-Fermion Interactions 47 Quarks and Hadrons 48 Methods of Studying Semileptonic Decays A Measurement of the Lifetime and Mixing Frequency of Neutral B Mesons with Semileptonic Decays in the BABAR Detector* Chih-Hsiang Cheng Stanford Linear Accelerator Center Stanford University Stanford, CA SLAC-Report Prepared for the Department of Energy under contract number DE-ACSF Printed in the United States of America.

    Examples of particle interactions described in terms of Feynman vertices. 1. neutron decays to a proton, electron and an anti-electron neutrino. 2. pi-plus decays to mu-plus and a muon neutrino. 3. a positive muon decays to a muon antineutrino, a positron and an electron neutrino. 4 K zero decays to a pi-minus and pi-plus via the weak interaction. Precision measurement of the form factors of the charged kaon semileptonic decays K!p l3 Mauro Picciniy INFN - Sezione di Perugia E-mail: [email protected] The NA48/2 experiment has presented a final result of the charged kaon semileptonic decays form factors measurement based on million K!p0e n (K e3) and million K!p0m nAuthor: Mauro Piccini.


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Analysis of the semileptonic decays of the neutral kaons by Andrew M. Cody Download PDF EPUB FB2

HE study of the semileptonic decays of the neutral kaons is one of the best illustration of the potentials offered by neutral K 0 K 0 system in disentanglingTandCPTviolation associated to the existingCPviolation. We can define four decay amplitudes for this channel: K 0 and K decaying.

Dalitz plots of 74, K sub (electron 3) andK sub (muon 3) decays were investigated to measure t-dependence of the form factors fsub(+)(t) and f(t) describing the vector contribution to the decay matrix element.

The decays were detected by analysis of the semileptonic decays of the neutral kaons book wire spark chamber spectrometer in the Serpukhov accelerator neutral beam. An analysis of linear explansion of the form factors gives the. A detailed analysis of neutral kaons decaying to pi(+)pi(-)pi(0) is presented based on the complete data set containing half a million events.

The decays were detected by a wire spark chamber spectrometer in the Serpukhov accelerator neutral beam. An analysis of linear explansion of the form factors gives the next slopes: lambdasub(+)sup(electron) = + or - in the K sub (electron 3) decays and lambdasub(+)sup(muon) = + or -lambda = + or - in.

A study of T violation via the semileptonic decays of neutral kaons in CPLEAR. The semileptonic decays of neutral kaon beams, K 0 /rightarrow/pi e/nu and /bar K 0 /rightarrow/pi e/nu, were measured in the CPLEAR experiment, and the parameters /Delta m, Re (x), Im (x), and Re (∊ S) were extracted using the time-dependent asymmetries in the rates for these two decay : Maxwell Benjamin Chertok.

Using the semileptonic decays of the neutral kaons the CPLEAR R. Adler et al. l A study of T violation c experiment will be able to detect a possible difference in the transition rates A"" A"") and fi(A"" K.

The neutral kaons are produced in the following reactions: pp -^ K^'K0^ m -K-K0^.Cited by: 1. Abstract The semileptonic decays of neutral kaon beams, rm K^>pi enu and | K^> pi enu, were measured in the CPLEAR experiment, and the parameters Delta m, Re (x), Im (x), and Re (varepsilon_ {rm S}) were extracted using the time-dependent asymmetries in the rates for these two decay channels.

We have analyzed one-prong τ decays with neutral kaons using the information from a fine-grained hadron calorimeter. The data sample consists of 43 Z → τ+τ−(γ) events collected by the.

Analysis of the time dependence of this semileptonic decay showed the phenomenon of oscillation, and allowed the extraction of the mass splitting between the K S and K L. Since this is due to weak interactions it is very small, 10 −15 times the mass of each state. Regeneration. A beam of neutral kaons decays in flight so that the short-lived KInteractions: Strong, weak, electromagnetic, gravitational.

A detailed description is given of the analysis of neutral kaons decaying toˇ+ˇ−, based on the com- plete data sample collected with the CPLEAR a novel approachinvolvinginitially strangeness-taggedK 0 and K 0, the time-dependent decay rate asymmetry has been measured.

Neutral Kaons. CP Eigenstates of Neutral Kaons. Strangeness Oscillation. Regeneration. Violation of CP Invariance. Time Development and Analysis of the System. Semileptonic K 0 Decays. Problems. Suggested Readings. A STUDY OF EXCLUSIVE SEMILEPTONIC D DECAYS TO PSEUDOSCALAR PION AND KAON FINAL STATES WITH THE CLEO-C DETECTOR.

Nadia Erin Adam, Ph.D. Cornell University UsingasampleofmillionDD¯ mesonscollectedattheΨ()withtheCLEO-c detector, and a reconstruction method based on the full event hermeticity, we.

rthat is nearly unity for kaons), is a small number, typically of order 10 3, r= iˇNv(f f) k(1 v2)1=2 1 [1=2 i(m2 m1)= 1] 1 The expression has been simpli ed by noting that since the K0 1 decays much faster than the K0 2, 1 >> 2.

If a neutral kaon beam travels a long distance, only K0 2 s are left. If the K0 2 s. a re-analysis of hyperon decays [15] and the measure-ment of the semileptonic decay of the charged kaon by BNL-E [16] has led to an overall agreement be-tween the results from neutral and charge semilep-tonic kaon decays, leptonic kaon decays, hyperon and tau decays.

It this the end of the story or there will be more surprises. CP, T and CPT tests with neutral kaons at KLOE-2 Michał Silarski 1. Introduction kinds of final states can be separated by the analysis of the p+p p0 Dalitz plot, thus allowing the Semileptonic neutral kaon decays provide tests of many fundamental aspects of the StandardAuthor: Michal Silarski.

The neutral K meson or neutral kaon, K0, and its antiparticle, K Neutral Kaons. Search within book. Front Matter. PDF. Introduction. Pages Propagation of neutral kaons in matter. Pages CP violation in K 0 decays.

Pages Interference in semileptonic and pionic decay modes. Analysis of the time dependence of this semileptonic decay showed the phenomenon of oscillation, and allowed the extraction of the mass splitting between the K S and K L. Since this is due to weak interactions it is very small, 10 −15 times the mass of each state.

Regeneration. A beam of neutral kaons decays in flight so that the short-lived K. The short-lived neutral kaon is called the K S ("K-short"), decays primarily into two pions, and has a mean lifetime ×10 −11 seconds. (See discussion of neutral kaon mixing below.

An experimental observation made in that K-longs rarely decay into two. For the semileptonic decays of the neutral kaons we may consider four independent decay rates as a function of the decay time, depending on the strangeness of the kaon (K 0 or K 0) at the production time t=0 and on the charge of the decay lepton (e + or e −): R + (τ)≡R K 0 t=0 → e + π − ν t=τ, R − (τ)≡R K 0 t=0 → e − π + ν t=τ, R − (τ)≡R K 0 t=0 → e − π + ν t=τ, R + (τ)≡R K 0 t=0 → e + π − ν t= by:.

The strangeness content of neutral kaon states can be al-ternatively determined by observing their semileptonic decay modes. Indeed, these semileptonic decays obey the well-tested DS=DQ rule which allows the modes K0s¯sdd!p −su¯dd + l+ + n l, K¯ 0ssd¯d!p+sud¯d + l +¯n l, sd where l stands for e or m, but forbids decays into the respec.To this purpose we have analyzed the full sample of neutral-kaon decays to e recorded in the CPLEAR experiment, where the strangeness of the neutral kaons was tagged at production and decay time.

An appropriate function of the measured decay rates, including in-formation from the analysis of + decay channel, gives directly Re().Theresult = (3.In particle physics the semileptonic decay of a hadron is a decay caused by the weak force in which one lepton (and the corresponding neutrino) is produced in addition to one or more hadrons.

An example for this can be K 0 → e − + ν e + π + This is to be contrasted with purely hadronic decays, such as K 0 → π .