Angular analysis of the B⁺→π⁺μ⁺μ^- decay

2026/04/23 by LHCb collaboration, R. Aaij, M. Abdelfatah +1112 · 2 voices
#hep-ex

paper · pdf

Abstract

This paper presents the first measurement of the forward-backward asymmetry, A_{\rm FB}, and the flat term, F_H, that parameterise the angular distribution of the B⁺→π⁺μ⁺μ^- decay. The proton-proton collision dataset used in the analysis corresponds to an integrated luminosity of 9 fb^-1, collected with the LHCb experiment between 2011 and 2018. The analysis is performed in two intervals of dimuon mass squared, one above and one below the region containing the J\mskip -3mu/\mskip -2muψ and ψ(2S) narrow charmonium resonances. The Standard Model predictions lie within the obtained 68% confidence level interval in the high-mass and within the 99% interval in the low-mass region.

Citations

• The LHCb Stripping Project: Sustainable Legacy Data Processing for High-Energy Physics
• Calibration and performance of the LHCb calorimeters in Run 1 and 2 at the LHC
• Measurement of the Differential Branching Fraction and Forward-Backward Asymmetry for B->K(*)l+l-
• Geant4 developments and applications

Discussions

• Angular analysis of the B⁺→π⁺μ⁺μ⁻ decay - The Standard Model predictions lie within the obtained 68% confidence level interval in the high-mass and within the 99% interval in the low-mass region. arxi [bsky, 5 points, 0 comments]
• #LHCbpaper: Angular analysis of the B⁺ → π⁺ μ⁺ μ⁻ decay (arXiv:2604.21987) https://arxiv.org/abs/2604.21987 [bsky, 1 points, 0 comments]

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