We present measurements of the first to fourth moments of the lepton mass squared q2 of B → X c lν̄l decays for l ¼ e, μ and with X c a hadronic system containing a charm quark. These results use a sample of electron-positron collisions at the ϒð4SÞ resonance corresponding to 62.8 fb−1 of integrated luminosity and collected by the Belle II 2 experiment in 2019 and 2020. To identify the X c system and reconstruct q2 , one of the B mesons from an ϒð4SÞ → BB̄ decay is fully reconstructed in a hadronic decay mode using a multivariate B tagging algorithm. We report raw and central moments for q2 > 1.5 GeV2 =c4 up to q2 > 8.5 GeV2 =c4 , probing up to 77% of the accessible B → X c lν̄l phase space. This is the first measurement of moments in the experimentally challenging range of ½1.5; 2.5 GeV2 =c4 . The results can be used for a new determination of jV cb j using inclusive B → X c lν̄l decays.

Abudinén, F., Adamczyk, K., Aggarwal, L., Ahmed, H., Aihara, H., Akopov, N., et al. (2023). Measurement of lepton mass squared moments in B→Xcℓν¯ℓ decays with the Belle II experiment. PHYSICAL REVIEW D, 107(7), 072002 [10.1103/PhysRevD.107.072002].

Measurement of lepton mass squared moments in B→Xcℓν¯ℓ decays with the Belle II experiment

Branchini, P.
Membro del Collaboration Group
;
Budano, A.
Membro del Collaboration Group
;
Bussino, S.
Membro del Collaboration Group
;
De Pietro, G.
Membro del Collaboration Group
;
Martini, A.
Membro del Collaboration Group
;
2023-01-01

Abstract

We present measurements of the first to fourth moments of the lepton mass squared q2 of B → X c lν̄l decays for l ¼ e, μ and with X c a hadronic system containing a charm quark. These results use a sample of electron-positron collisions at the ϒð4SÞ resonance corresponding to 62.8 fb−1 of integrated luminosity and collected by the Belle II 2 experiment in 2019 and 2020. To identify the X c system and reconstruct q2 , one of the B mesons from an ϒð4SÞ → BB̄ decay is fully reconstructed in a hadronic decay mode using a multivariate B tagging algorithm. We report raw and central moments for q2 > 1.5 GeV2 =c4 up to q2 > 8.5 GeV2 =c4 , probing up to 77% of the accessible B → X c lν̄l phase space. This is the first measurement of moments in the experimentally challenging range of ½1.5; 2.5 GeV2 =c4 . The results can be used for a new determination of jV cb j using inclusive B → X c lν̄l decays.
2023
Abudinén, F., Adamczyk, K., Aggarwal, L., Ahmed, H., Aihara, H., Akopov, N., et al. (2023). Measurement of lepton mass squared moments in B→Xcℓν¯ℓ decays with the Belle II experiment. PHYSICAL REVIEW D, 107(7), 072002 [10.1103/PhysRevD.107.072002].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11590/435107
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