Measurement of Hadronic Mass Moments $\langle M_X^n \rangle $ in $B \rightarrow X_c \ell ν$ Decays at Belle II
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- Abstract
- We present measurements of the first six hadronic mass moments in semileptonic $B \rightarrow X_c \ell \nu $ decays. The hadronic mass moments, together with other observables of inclusive $B$ decays, can be used to determine the CKM matrix element $|{V_{cb}}|$ and mass of the $b$-quark $m_b$ in the context of Heavy Quark Expansions of QCD. The Belle~II data recorded at the $\Upsilon (4S)$ resonance in 2019 and 2020 (March-July), corresponding to an integrated luminosity of $34.6\;\mathrm{fb}^{-1}$, is used for this measurement. The decay $\Upsilon (4S) \rightarrow B \overline{B}$ is reconstructed by applying the hadronic tagging algorithm provided by the Full Event Interpretation to fully reconstruct one $B$ meson. The second $B$ meson is reconstructed inclusively by selecting a high-momentum lepton. The $X_c$ system is identified by the remaining reconstructed tracks and clusters in the electromagnetic calorimeter. We report preliminary results for the hadronic mass moments $\langle M_X^n \rangle $ with $n=1,\dots,6$, measured as a function of a lower cut on the lepton momentum in the signal $B$ rest frame.
- Autoren
- Belle II Collaboration
- F Abudinén
- I Adachi
- R Adak
- K Adamczyk
- P Ahlburg
- JK Ahn
- H Aihara
- N Akopov
- A Aloisio
- F Ameli
- L Andricek
- N Anh Ky
- DM Asner
- H Atmacan
- V Aulchenko
- T Aushev
- V Aushev
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- V Babu
- S Bacher
- S Baehr
- S Bahinipati
- AM Bakich
- P Bambade
- Sw Banerjee
- S Bansal
- M Barrett
- G Batignani
- J Baudot
- A Beaulieu
- J Becker
- PK Behera
- M Bender
- JV Bennett
- E Bernieri
- FU Bernlochner
- M Bertemes
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- L Burmistrov
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- M Campajola
- L Cao
- G Caria
- G Casarosa
- C Cecchi
- D Červenkov
- M-C Chang
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- R Cheaib
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- I Domínguez Jiménez
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- A Zupanc
- Autoren-URL
- http://arxiv.org/abs/2009.04493v1
- Schlüsselwörter
- hep-ex
- hep-ex
- Datum der Veröffentlichung
- 2020
- Datum der Datenerfassung
- 2020
- Datum, an dem der Datensatz öffentlich gemacht wurde
- 2020
- Titel
- Measurement of Hadronic Mass Moments $\langle M_X^n \rangle $ in $B \rightarrow X_c \ell ν$ Decays at Belle II
Files
2009.04493v1.pdf
Datenquelle: arXiv
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