Angular analysis of the $B^{0} \to K^{*0} e^{+} e^{−}$ decay in the low-q$^{2}$ region

, collected by the LHCb experiment in pp collisions at centre-of-mass energies of 7 and 8 TeV during 2011 and 2012. For the first time several observables are measured in the dielectron mass squared (q

^{2}

) interval between 0.002 and 1.120 GeV

^{2}

/c

^{4}

. The angular observables F

_{L}

and A

_{T}^{Re}

which are related to the K^{*}^{0} polarisation and to the lepton forward-backward asymmetry, are measured to be F

_{L}

= 0.16 ± 0.06 ± 0.03 and A

_{T}^{Re}

= 0.10 ± 0.18 ± 0.05, where the first uncertainty is statistical and the second systematic. The angular observables A

_{T}^{(2)}

and A

_{T}^{Im}

which are sensitive to the photon polarisation in this q

^{2}

range, are found to be A

_{T}^{(2)}

= − 0.23 ± 0.23 ± 0.05 and A

_{T}^{Im}

= 0.14 ± 0.22 ± 0.05. The results are consistent with Standard Model predictions.

Note:

18 pages, 5 figures

Rare decay
Polarization
B physics
Flavour Changing Neutral Currents
Hadron-Hadron Scattering
p p: colliding beams
B0: semileptonic decay
K*(892)0: polarization
photon: polarization
angular distribution: asymmetry

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Figures(11)

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Angular analysis of the B0→K∗0e+e−B^{0} \to K^{*0} e^{+} e^{−}B0→K∗0e+e− decay in the low-q2^{2}2 region

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Angular analysis of the $B^{0} \to K^{*0} e^{+} e^{−}$ decay in the low-q $^{2}$ region