Measurements of the Λb0→J/ψΛ decay amplitudes and the Λb0 polarisation in pp collisions at s=7 TeV

An angular analysis of Λb0→J/ψΛ decays is performed using a data sample corresponding to 1.0 fb−1 collected in pp collisions at s=7 TeV with the LHCb detector at the LHC. A parity violating asymmetry parameter characterising the Λb0→J/ψΛ decay of 0.05±0.17±0.07 and a Λb0 transverse production polarisation of 0.06±0.07±0.02 are measured, where the first uncertainty is statistical and the second systematic.