Measurement of the $D^{*}$ longitudinal polarization in $B^0\to D^{*-}τ^{+}ν_τ$ decays
Creators: name: LHCb Collaboration
name: Aaij, R.
name: Abdelmotteleb, A. S. W.
name: Beteta, C. Abellan
name: Abudinén, F.
name: Ackernley, T.
name: Adeva, B.
name: Adinolfi, M.
name: Adlarson, P.
name: Afsharnia, H.
name: Agapopoulou, C.
name: Aidala, C. A.
name: Ajaltouni, Z.
name: Akar, S.
name: Akiba, K.
name: Albicocco, P.
name: Albrecht, J.
name: Alessio, F.
name: Alexander, M.
name: Albero, A. Alfonso
name: Aliouche, Z.
name: Cartelle, P. Alvarez
name: Amalric, R.
name: Amato, S.
name: Amey, J. L.
name: Amhis, Y.
name: An, L.
name: Anderlini, L.
name: Andersson, M.
name: Andreianov, A.
name: Andreola, P.
name: Andreotti, M.
name: Andreou, D.
name: Ao, D.
name: Archilli, F.
name: Cuendis, S. Arguedas
name: Artamonov, A.
name: Artuso, M.
name: Aslanides, E.
name: Atzeni, M.
name: Audurier, B.
name: Bacher, D.
name: Perea, I. Bachiller
name: Bachmann, S.
name: Bachmayer, M.
name: Back, J. J.
name: Bailly-reyre, A.
name: Rodriguez, P. Baladron
name: Balagura, V.
name: Baldini, W.
name: Leite, J. Baptista de Souza
name: Barbetti, M.
name: Barbosa, I. R.
name: Barlow, R. J.
name: Barsuk, S.
name: Barter, W.
name: Bartolini, M.
name: Baryshnikov, F.
name: Basels, J. M.
name: Bassi, G.
name: Batsukh, B.
name: Battig, A.
name: Bay, A.
name: Beck, A.
name: Becker, M.
name: Bedeschi, F.
name: Bediaga, I. B.
name: Beiter, A.
name: Belin, S.
name: Bellee, V.
name: Belous, K.
name: Belov, I.
name: Belyaev, I.
name: Benane, G.
name: Bencivenni, G.
name: Ben-Haim, E.
name: Berezhnoy, A.
name: Bernet, R.
name: Andres, S. Bernet
name: Berninghoff, D.
name: Bernstein, H. C.
name: Bertella, C.
name: Bertolin, A.
name: Betancourt, C.
name: Betti, F.
name: Bex, J.
name: Bezshyiko, Ia.
name: Bhom, J.
name: Bian, L.
name: Bieker, M. S.
name: Biesuz, N. V.
name: Billoir, P.
name: Biolchini, A.
name: Birch, M.
name: Bishop, F. C. R.
name: Bitadze, A.
name: Bizzeti, A.
name: Blago, M. P.
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name: Blanc, F.
name: Blank, J. E.
name: Blusk, S.
name: Bobulska, D.
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name: Boelhauve, J. A.
name: Garcia, O. Boente
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Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: The longitudinal polarization fraction of the $D^{*}$ meson is measured in $B^0\to D^{*-}τ^{+}ν_τ$ 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 fb$^{-1}$. The $D^{*}$ polarization fraction $F_{L}^{D^{*}}$ is measured in two $q^{2}$ regions, below and above 7 GeV$^{2}/c^{4}$, where $q^{2}$ is defined as the squared invariant mass of the $τν_τ$ system. The $F_{L}^{D^{*}}$ values are measured to be $0.52 \pm 0.07 \pm 0.04$ and $0.34 \pm 0.08 \pm 0.02$ for the lower and higher $q^{2}$ regions, respectively. The first uncertainties are statistical and the second systematic. The average value over the whole $q^{2}$ range is: $$F_{L}^{D^{*}} = 0.41 \pm 0.06 \pm 0.03.$$ These results are compatible with the Standard Model predictions.
description: All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2023-020.html (LHCb public pages)