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Exclusive production of pion and kaon meson pairs in two photon collisions at LEP.

Research output: Contribution to journalJournal article

Published

  • . ALEPH Collaboration
  • A. Heister
  • S. Schael
  • R. Barate
  • R. Brunelière
  • I. De Bonis
  • D. Decamp
  • C. Goy
  • S. Jezequel
  • J. -P. Lees
  • E. Merle
  • M. -N. Minard
  • B. Pietrzyk
  • B. Trocmé
  • S. Bravo
  • M. P. Casado
  • M. Chmeissani
  • J. M. Crespo
  • E. Fernandez
Journal publication date11/09/2003
JournalPhysics Letters B
Journal number3-4
Volume569
Number of pages11
Pages140-150
Original languageEnglish

Abstract

Exclusive production of π and K meson pairs in two photon collisions is measured with ALEPH data collected between 1992 and 2000. Cross-sections are presented as a function of cosθ* and invariant mass, for |cosθ*|<0.6 and invariant masses between 2.0 and 6.0 GeV/c2 (2.25 and 4.0 GeV/c2) for pions (kaons). The shape of the distributions are found to be well described by QCD predictions but the data have a significantly higher normalization.