, Volume 60, Issue 3, pp 557–561 | Cite as

On unitarity relations and their application to meson—antimeson mixing

  • G. V. Dass


In view of the recent observation of nonexponential decay features for a certain quantummechanical system, we revisit our earlier study of the small-time behaviour of the meson-antimeson complex wherein the commonly employed Weisskopf—Wigner approximation could be tested, in principle. We find that the experiments for this testing are difficult because of (i) the smallness of the times required for this study, (ii) the high accuracy required for probing the nonleading terms (which distinguish this approximation from the general theory) in the small-time behaviour of the relevant probabilities and (iii) the crude knowledge of the required ‘flavour-tagging’ procedures, as available at present


Small-time-behaviour meson-antimeson complex Weisskopf-Wigner approximation 


03.65.Ta 11.30.Er 13.20.-v 13.25.-k 


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. [1]
    G V Dass,Phys. Rev. D60, 017501 (1999)ADSGoogle Scholar
  2. [2]
    M C Fisher, B Gutierrez-Medina and M G Raizen,Phys. Rev. Lett. 87, 040402 (2001)CrossRefADSGoogle Scholar
  3. [3]
    C Bernardini, L Maiani and M Testa,Phys. Rev. Lett. 71, 2687 (1993)CrossRefADSGoogle Scholar
  4. [4]
    G V Dass,Mod. Phys. Lett. A16, 9 (2001)ADSGoogle Scholar
  5. [5]
    P K Kabir,Phys. Lett. B459, 335 (1999)ADSGoogle Scholar
  6. [5a]
    I I Bigi and A I Sanda,Phys. Lett. B466, 33 (1999)ADSGoogle Scholar
  7. [5b]
    A Rouge, preprint X-LPNHE 99/05,On the direct evidence of time-reversal-noninvariance in the K0 — K-0 system, hep-ph/9909205Google Scholar
  8. [6]
    CPLEAR Collaboration: A Angelopouloset al, Phys. Lett. B444, 43 (1998)ADSGoogle Scholar
  9. [7]
    N W Tanner and R H Dalitz,Ann. Phys. 171, 463 (1986)CrossRefADSGoogle Scholar
  10. [8]
    CPLEAR Collaboration: A Apostolakiset al, Phys. Lett. B422, 339 (1998)ADSGoogle Scholar
  11. [9]
    S L Wu, CERN-PPE/96-82 (June 1996),Recent results on B meson oscillations — Plenary Talk at the17th Int. Symp. Lepton-Photon Interactions (Beijing, China, August 1995)Google Scholar

Copyright information

© Indian Academy of Sciences 2003

Authors and Affiliations

  • G. V. Dass
    • 1
  1. 1.Department of PhysicsIndian Institute of TechnologyMumbaiIndia

Personalised recommendations