Abstract
With an integrated luminosity of recorded by the ATLAS experiment at the LHC, the exclusive decays and of mesons produced in collisions at are used to determine the ratio of fragmentation fractions . From the observed and yields, the quantity is measured to be . Using a recent theory prediction for yields . This result is based on a new approach that provides a significant improvement of the world average.
- Received 3 August 2015
DOI:https://doi.org/10.1103/PhysRevLett.115.262001
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© 2015 CERN, for the Atlas Collaboration