We present measurements of the first to fourth moments of the lepton mass squared q2 of B→Xcℓ¯νℓ decays for ℓ=e, μ and with Xc a hadronic system containing a charm quark. These results use a sample of electron-positron collisions at the Υ(4S) 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 Xc system and reconstruct q2, one of the B mesons from an Υ(4S)→B¯B 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→Xcℓ¯νℓ phase space. This is the first measurement of moments in the experimentally challenging range of [1.5,2.5]  GeV2/c4. The results can be used for a new determination of |Vcb| using inclusive B→Xcℓ¯νℓ decays.

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

Gabrielli, A.;Ganiev, E.;La Licata, C.;Lanceri, L.;Manfredi, R.;Raiz, S.;Vitale, L.;
2023-01-01

Abstract

We present measurements of the first to fourth moments of the lepton mass squared q2 of B→Xcℓ¯νℓ decays for ℓ=e, μ and with Xc a hadronic system containing a charm quark. These results use a sample of electron-positron collisions at the Υ(4S) 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 Xc system and reconstruct q2, one of the B mesons from an Υ(4S)→B¯B 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→Xcℓ¯νℓ phase space. This is the first measurement of moments in the experimentally challenging range of [1.5,2.5]  GeV2/c4. The results can be used for a new determination of |Vcb| using inclusive B→Xcℓ¯νℓ decays.
2023
Pubblicato
https://journals.aps.org/prd/abstract/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/11368/3068803
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