Deuteron and Anti-deuteron Production in e+e- Collisions at the Z Resonance
The ALEPH Collaboration: S.Schael, et al
TL;DR
This paper reports the first observation and measurement of deuteron and anti-deuteron production in Z boson decays at LEP, providing insights into anti-nuclei formation in high-energy electron-positron collisions.
Contribution
It presents the first measurements of anti-deuteron production rates and the coalescence parameter in Z decays, highlighting differences from other collision types.
Findings
Anti-deuteron production rate is approximately 6 in 1 million Z decays.
The coalescence parameter B_2 is measured to be 0.0033 GeV^2.
Anti-deuteron production is suppressed compared to pp and photoproduction collisions.
Abstract
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 0.62 to 1.03 GeV/c. The coalescence parameter B_2, which characterizes the likelihood of anti-deuteron production, is measured to be 0.0033+-0.0013 GeV^2 in Z dedays. These measurements indicate that the production of anti-deuterons is suppressed in e+e- collisions compared to pp and photoproduction collisions.
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