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Search for Hidden-Sector Bosons in B(0)→K(*0)μ(+)μ(-) Decays.

R Aaij1, B Adeva2, M Adinolfi3

  • 1European Organization for Nuclear Research (CERN), Geneva, Switzerland.

Physical Review Letters
|November 10, 2015
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Summary
This summary is machine-generated.

Researchers searched for hidden-sector bosons (χ) in B(0) decays using LHCb data. No signal was found, leading to new upper limits on the production rate and decay of these hypothetical particles.

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Area of Science:

  • Particle Physics
  • High Energy Physics
  • Beyond Standard Model Physics

Background:

  • The Standard Model of particle physics does not account for all observed phenomena, motivating searches for new particles.
  • Hidden sectors are theoretical constructs that could contain new, weakly interacting particles like bosons.
  • The B meson system provides a rich environment for searching for new physics due to its complex decay modes.

Purpose of the Study:

  • To search for evidence of hidden-sector bosons (χ) produced in the decay of B(0) mesons.
  • To investigate the decay channel B(0)→K*(892)(0)χ, where χ decays into a muon-antimuon pair (μ(+)μ(-)).
  • To set limits on the production and decay rates of these hypothetical bosons.

Main Methods:

  • Utilized proton-proton collision data collected by the LHCb detector, corresponding to an integrated luminosity of 3.0 fb⁻¹.
  • Performed a search for the decay signature B(0)→K*(892)(0)χ with K*(892)(0)→K(+)π(-) and χ→μ(+)μ(-).
  • Analyzed the invariant mass spectrum of the dimuon system to identify potential χ boson signals.

Main Results:

  • No significant excess of events was observed in the analyzed data, indicating no discovery of the χ boson in the searched mass range (214–4350 MeV).
  • Upper limits were established for the branching fraction product B(B(0)→K*(892)(0)χ)×B(χ→μ(+)μ(-)).
  • The derived limits are on the order of 10⁻⁹ for χ lifetimes below 100 picoseconds across most of the mass range.

Conclusions:

  • The search places the most stringent constraints to date on many theories predicting the existence of additional low-mass bosons.
  • The results exclude a significant parameter space for certain theoretical models beyond the Standard Model.
  • Further searches with increased luminosity or different decay channels may be necessary to probe for these elusive particles.