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Constraints on the K_{S}^{0}→μ^{+}μ^{-} Branching Fraction.

R Aaij1, C Abellán Beteta2, T Ackernley3

  • 1Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands.

Physical Review Letters
|December 18, 2020
PubMed
Summary
This summary is machine-generated.

Researchers searched for the rare K_{S}^{0}→μ^{+}μ^{-} decay using LHCb data. The study sets a new upper limit on this decay

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Area of Science:

  • Particle Physics
  • High Energy Physics
  • Standard Model Physics

Background:

  • The decay of neutral kaons (K_{S}^{0}) into muon pairs (μ^{+}μ^{-}) is a rare process predicted by the Standard Model.
  • Understanding such rare decays provides crucial tests of the Standard Model and probes for new physics beyond it.

Purpose of the Study:

  • To search for the decay K_{S}^{0}→μ^{+}μ^{-} with unprecedented sensitivity.
  • To set stringent upper limits on the branching fraction of this decay, constraining theoretical models.

Main Methods:

  • Analysis of large datasets from proton-proton collisions at 13 TeV center-of-mass energy, collected by the LHCb experiment.
  • Utilizing an integrated luminosity of 5.6 fb^{-1} from 2016-2018 data, combined with earlier data from 2011-2012.

Main Results:

  • The observed signal yield for K_{S}^{0}→μ^{+}μ^{-} is consistent with zero.
  • An upper limit of B(K_{S}^{0}→μ^{+}μ^{-})<2.2×10^{-10} at 90% confidence level (C.L.) was established.
  • Combining with previous data, the limit improved to B(K_{S}^{0}→μ^{+}μ^{-})<2.1×10^{-10} at 90% C.L.

Conclusions:

  • The stringent upper limit significantly constrains the branching fraction of K_{S}^{0}→μ^{+}μ^{-}.
  • This result challenges certain theoretical extensions to the Standard Model that predict a larger branching ratio for this decay.