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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
<mark>Journal publication date</mark>11/09/2003
<mark>Journal</mark>Physics Letters B
Issue number3-4
Volume569
Number of pages11
Pages (from-to)140-150
<mark>State</mark>Published
<mark>Original language</mark>English

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 and invariant mass, for 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.