The KL-KS mass difference

Johan Bijnens, Jean Marc Gérard, Gerhard Klein

Research output: Contribution to journalArticlepeer-review


The matching of the log and short distance contributions to the KL-KS mass difference is investigated in the large Nc limit (Nc being the number of colours). In this limit a physically well defined separation between the two regimes exists. This allows for an investigation of the matching between the two contributions. We obtain that 0.8±0.1 of the observed mass difference is due to the light and charm quarks contribution. An estimate of the top and top-charm contributions is also given.

Original languageEnglish
Pages (from-to)191-195
Number of pages5
JournalPhysics Letters B
Issue number1-2
Publication statusPublished - 1991 Mar 21
Externally publishedYes

Subject classification (UKÄ)

  • Subatomic Physics


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