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AI Summary of Peer-Reviewed Research

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LHCb measurements match expectations for B+ decay angular rates

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in
Research area:Particle physicsParticle physics theoretical and experimental studiesUpgrade

What the study found

The measured normalised decay rate of B+ → J/ψ(→ μ+ μ−)K+ as a function of the lepton helicity angle agrees with expectations. The study also reports that the LHCb Upgrade I detector response is understood to the precision needed for related measurements.

Why the authors say this matters

The authors conclude that this level of detector understanding is needed to reliably extract angular coefficients for rare b → sμ+ μ− and b → dμ+ μ− transitions, which they say are particularly sensitive to physics beyond the Standard Model.

What the researchers tested

The researchers used a data sample corresponding to 1.1 fb−1 collected in October 2024 with the upgraded LHCb detector. They measured the angular distribution of B+ → J/ψ(→ μ+ μ−)K+ and parameterised it with two coefficients: the forward-backward asymmetry, AFB, and the flatness parameter, FH.

What worked and what didn't

The coefficients were measured both integrated and differentially across various kinematic and detector-response variables. The results were found to be in good agreement with expectations.

What to keep in mind

The abstract does not describe specific numerical values or detailed limitations. It also does not provide a comparison to other experiments in the available summary.

Key points

  • The measured normalised decay rate of B+ → J/ψ(→ μ+ μ−)K+ agrees with expectations.
  • The angular distribution was parameterised with the forward-backward asymmetry AFB and the flatness parameter FH.
  • The study used 1.1 fb−1 of data collected in October 2024 with the upgraded LHCb detector.
  • The coefficients were measured both integrated and differentially across kinematic and detector-response variables.
  • The authors say the detector response is understood well enough to support extraction of angular coefficients for rare b decays.

Disclosure

Research title:
LHCb measurements match expectations for B+ decay angular rates
AI provenance: AI provenance information is not available for this post.