This paper presents the first measurement of the forward-backward asymmetry, AFB, and the flat term, FH, 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/ψ 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.

Aaij, R., Abdelfatah, M., Abdelmotteleb, A., Abellan Beteta, C., Abudinen, F., Ackernley, T., et al. (2026). Angular analysis of the B+→ π+μ+μ− decay. JOURNAL OF HIGH ENERGY PHYSICS, 2026(8) [10.1007/JHEP08(2026)004].

Angular analysis of the B+→ π+μ+μ− decay

Anelli A.;Arnone L.;Borsato M.;Calvi M.;Capelli S.;Carniti P.;Falcao L. N.;Fazzini D.;Gotti C.;Kirsebom V. S.;Malentacca L.;Martinazzoli L.;Martinelli M.;Minotti A.;Moro A.;Pizzichemi M.;Salomoni M.;
2026

Abstract

This paper presents the first measurement of the forward-backward asymmetry, AFB, and the flat term, FH, 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/ψ 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.
Articolo in rivista - Articolo scientifico
B Physics; Flavour Physics; Hadron-Hadron Scattering; Rare Decay;
English
3-ago-2026
2026
2026
8
4
none
Aaij, R., Abdelfatah, M., Abdelmotteleb, A., Abellan Beteta, C., Abudinen, F., Ackernley, T., et al. (2026). Angular analysis of the B+→ π+μ+μ− decay. JOURNAL OF HIGH ENERGY PHYSICS, 2026(8) [10.1007/JHEP08(2026)004].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/625384
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