Measurement of the D * longitudinal polarization in B 0 → D * − τ + ν τ decays

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doi:10.1103/PhysRevD.110.092007

Measurement of the $D^{}$ longitudinal polarization in $B^{0} \to D^{ -} τ^{+} ν_{τ}$ decays

Journal Article · Mon Nov 11 23:00:00 EST 2024 · Physical Review. D.

DOI:https://doi.org/10.1103/PhysRevD.110.092007· OSTI ID:2477084

; ; Abellan Beteta, C.; ; ; ; ; ; Afsharnia, H.; ; ; Ajaltouni, Z.; ; ; ; ; ; ; ; more »

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 $τ ν_{τ}$ 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.

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Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

OSTI ID:: 2477084

Journal Information:: Physical Review. D., Journal Name: Physical Review. D. Journal Issue: 9 Vol. 110; ISSN PRVDAQ; ISSN 2470-0010

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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