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Deuteron and anti-deuteron production in e+ e- collisions at the Z resonance.

Research output: Contribution to journalJournal article

<mark>Journal publication date</mark>10/08/2006
<mark>Journal</mark>Physics Letters B
Issue number3-4
Number of pages10
Pages (from-to)192-201
<mark>Original language</mark>English


Deuteron and anti-deuteron production in Z decays has been observed in the ALEPH experiment at LEP. The production rate of anti-deuterons is measured to be (5.9±1.8±0.5)×10−6 per hadronic Z decay in the anti-deuteron momentum range from 0.62 to 1.03 GeV/c. The coalescence parameter B2, which characterizes the likelihood of anti-deuteron production, is measured to be 0.0033±0.0013 GeV2 in Z decays. These measurements indicate that the production of anti-deuterons is suppressed in e+e− collisions compared to that in pp and photoproduction collisions.