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Measurement of the 𝐷* longitudinal polarization in 𝐡0→𝐷*βˆ’β’πœ+⁒𝜈𝜏 decays

The longitudinal polarization fraction of the 𝐷* meson is measured in 𝐡0 →𝐷*βˆ’β’πœ+⁒𝜈𝜏 decays, where the 𝜏 lepton decays to three charged pions and a neutrino, using proton-proton collision data collected by the LHCb experiment at center-of-mass energies of 7, 8 and 13 TeV and corresponding to an integ...

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Main Authors: Aaij, Roel (Author) , Bachmann, Sebastian (Author) , Carus, Leon (Author) , Caspary, Rowina (Author) , Cocha Toapaxi, Carlos (Author) , De Cian, Michel (Author) , Han, Xiaoxue (Author) , Hansmann-Menzemer, Stephanie (Author) , Langenbruch, Christoph (Author) , Leverington, Blake (Author) , Marks, Jörg (Author) , Morgenthaler, Maurice Pierre (Author) , Ruiz Diaz, Miguel (Author) , Tuci, Giulia (Author) , Uecker, Lennart Henning (Author) , Unverzagt, Daniel Joachim (Author) , Uwer, Ulrich (Author) , Witola, Lukas (Author) , Zhao, Ya (Author) , Zhelezov, Alexey (Author)
Corporate Author: LHCb Collaboration (Author)
Other Authors: Glaser, Fabian (Other) , Hu, Jiangqiao (Other)
Format: Article (Journal)
Language:English
Published: 12 November 2024
In: Physical review
Year: 2024, Volume: 110, Issue: 9, Pages: 092007-1-092007-18
ISSN:2470-0029
DOI:10.1103/PhysRevD.110.092007
Online Access:Verlag, kostenfrei, Volltext: https://doi.org/10.1103/PhysRevD.110.092007
Verlag, kostenfrei, Volltext: https://link.aps.org/doi/10.1103/PhysRevD.110.092007
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Author Notes:R. Aaij et al. (LHCb Collaboration)
Description
Summary:The longitudinal polarization fraction of the 𝐷* meson is measured in 𝐡0 →𝐷*βˆ’β’πœ+⁒𝜈𝜏 decays, where the 𝜏 lepton decays to three charged pions and a neutrino, using proton-proton collision data collected by the LHCb experiment at center-of-mass energies of 7, 8 and 13 TeV and corresponding to an integrated luminosity of 5 fbβˆ’1. The 𝐷* polarization fraction 𝐹𝐷*𝐿 is measured in two π‘ž2 regions, below and above 7 GeV2/𝑐4, where π‘ž2 is defined as the squared invariant mass of the 𝜏⁒𝜈𝜏 system. The 𝐹𝐷*𝐿 values are measured to be 0.52 Β±0.07 Β±0.04 and 0.34 Β±0.08 Β±0.02 for the lower and higher π‘ž2 regions, respectively. The first uncertainties are statistical and the second systematic. The average value over the whole π‘ž2 range is 𝐹𝐷*𝐿=0.41Β±0.06Β±0.03. These results are compatible with the Standard Model predictions.
Item Description:ATLAS Collaboration: R. Aaij, S. Bachmann, L. Carus, R. Caspary, C. Cocha Toapax, M. De Cian, F.C. Glaser, X. Han, S. Hansmann-Menzemer, J. Hu, C. Langenbruch, B. Leverington, J. Marks, M.P. Morgenthaler, M. Ruiz Diaz, G. Tuci, L. Uecker, D.J. Unverzagt, U. Uwer, L. Witola, Y. Zhao, A. Zhelezov [und zahlreicher weitere]
Gesehen am 19.12.2025
Physical Description:Online Resource
ISSN:2470-0029
DOI:10.1103/PhysRevD.110.092007

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