Measurement of the <math display="inline"><msup><mi>D</mi><mo>*</mo></msup></math> longitudinal polarization in <math display="inline"><mrow><msup><mrow><mi>B</mi></mrow><mn>0</mn></msup><mo stretchy="false">→</mo><msup><mrow><mi>D</mi></mrow><mrow><mo>*</mo><mo>-</mo></mrow></msup><msup><mrow><mi>τ</mi></mrow><mrow><mo>+</mo></mrow></msup><msub><mrow><mi>ν</mi></mrow><mrow><mi>τ</mi></mrow></msub></mrow></math> decays - INSPIRE

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

LHCb

Collaboration

Nov 9, 2023

18 pages

Published in:

Phys.Rev.D 110 (2024) 9, 092007

Published: Nov 1, 2024

e-Print:

2311.05224 [hep-ex]

DOI:

10.1103/PhysRevD.110.092007 (publication)

Report number:

LHCb-PAPER-2023-020,
CERN-EP-2023-225

Experiments:

CERN-LHC-LHCb

View in:

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Abstract: (APS)

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.

Note:

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)

p p: colliding beams
B0: semileptonic decay
D*(2010): polarization
polarization: longitudinal
tau: hadronic decay
p p: scattering
polarization: measured
CERN LHC Coll
LHC-B
error: statistical

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