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+ -> pi+mu+mu− 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/Psi and Psi(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.

Angular analysis of the B+-> pi+mu+mu− decay

Celestino I.
Membro del Collaboration Group
;
Cordova G.
Membro del Collaboration Group
;
Kleijne N.
Membro del Collaboration Group
;
Morello M. J.
Membro del Collaboration Group
;
Passaro D.
Membro del Collaboration Group
;
Pica L.
Membro del Collaboration Group
;
Riccardi D.
Membro del Collaboration Group
;
Xu A.
Membro del Collaboration Group
;
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+ -> pi+mu+mu− 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/Psi and Psi(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.
2026
Settore FIS/01 - Fisica Sperimentale
Settore PHYS-01/A - Fisica sperimentale delle interazioni fondamentali e applicazioni
B Physics; Flavour Physics; Hadron-Hadron Scattering; Rare Decay
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11384/175764
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