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

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hdl_148178.pdf (8.92 MB)
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Date

2023

Authors

Abudinén, F.
Adamczyk, K.
Aggarwal, L.
Ahmed, H.
Aihara, H.
Akopov, N.
Aloisio, A.
Anh Ky, N.
Asner, D.M.
Atmacan, H.

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Journal article

Citation

Physical Review D, 2023; 107(7):072002-1-072002-24

Statement of Responsibility

Belle II Collaboration

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DOI

10.1103/PhysRevD.107.072002

Abstract

We present measurements of the first to fourth moments of the lepton mass squared q2 of B → Xcl¯νl decays for l ¼ e, μ and with Xc 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 Xc system and reconstruct q2, one of the B mesons from an ϒð4SÞ → BB¯ 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 jVcbj using inclusive B → Xcl¯νl decays.

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Published 5 April 2023

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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

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http://purl.org/au-research/grants/arc/DE220100462
 http://purl.org/au-research/grants/arc/DP180102629
 http://purl.org/au-research/grants/arc/DP170102389
 http://purl.org/au-research/grants/arc/DP170102204
 http://purl.org/au-research/grants/arc/DP150103061
 http://purl.org/au-research/grants/arc/FT130100303
 http://purl.org/au-research/grants/arc/FT130100018
 http://purl.org/au-research/grants/arc/FT120100745

Published Version

https://doi.org/10.1103/physrevd.107.072002

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Persistent link to this record

https://hdl.handle.net/2440/148178