Strong constraints on the $b \to s\gamma$ photon polarisation from $B^0 \to K^{*0} e^+ e^-$ decays - INSPIRE

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Strong constraints on the $b \to s\gamma$ photon polarisation from $B^0 \to K^{*0} e^+ e^-$ decays

LHCb

Collaboration

Oct 12, 2020

25 pages

Published in:

JHEP 12 (2020) 081

Published: Dec 11, 2020

e-Print:

2010.06011 [hep-ex]

DOI:

10.1007/JHEP12(2020)081 (publication)

PDG:

\Gamma _{L}/\Gamma

{{\mathit B}^{0}}

\rightarrow

{{\mathit K}^{*}{(892)}^{0}}{{\mathit e}^{+}}{{\mathit e}^{-}}

{}^{2}

Report number:

LHCb-PAPER-2020-020,
CERN-EP-2020-176

Experiments:

CERN-LHC-LHCb

View in:

reference search75 citations

Citations per year

Abstract: (Springer)

An angular analysis of the B

^{0}

→ K*

^{0}

e

^{+}

e

^{−}

decay is performed using a data sample corresponding to an integrated luminosity of 9 fb

^{−1}

of pp collisions collected with the LHCb experiment. The analysis is conducted in the very low dielectron mass squared (q

^{2}

) interval between 0.0008 and 0.257 GeV

^{2}

, where the rate is dominated by the B

^{0}

→ K

^{*0}

γ transition with a virtual photon. The fraction of longitudinal polarisation of the K

^{*0}

meson, F

_{L}

, is measured to be F

_{L}

= (4.4 ± 2.6 ± 1.4)%, where the first uncertainty is statistical and the second systematic. The

{A}_{\mathrm{T}}^{\mathrm{Re}}

observable, which is related to the lepton forward-backward asymmetry, is measured to be

{A}_{\mathrm{T}}^{\mathrm{Re}}

= −0.06 ± 0.08 ± 0.02. The

{A}_{\mathrm{T}}^{(2)}

and

{A}_{\mathrm{T}}^{\mathrm{Im}}

transverse asymmetries, which are sensitive to the virtual photon polarisation, are found to be

{A}_{\mathrm{T}}^{(2)}

= 0.11 ± 0.10 ± 0.02 and

{A}_{\mathrm{T}}^{\mathrm{Im}}

= 0.02 ± 0.10 ± 0.01. The results are consistent with Standard Model predictions and provide the world’s best constraint on the b → sγ photon polarisation.[graphic not available: see fulltext]

Note:

All figures and tables, along with machine-readable versions and any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2020-020.html (LHCb public pages)

Rare decay
Flavour Changing Neutral Currents
Polarization
B physics
Hadron-Hadron scattering (experiments)
p p: colliding beams
photon: polarization
photon: virtual
polarization: longitudinal
angular distribution: asymmetry

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