An angular analysis of Lambda_b0 -> J/psi Lambda decays is performed using a data sample corresponding to 1.0 fb^{-1} collected in pp collisions at sqrt(s) = 7 TeV with the LHCb detector at the LHC. A parity violating asymmetry parameter characterising the Lambda_b0 -> J/psi Lambda decay of 0.05 +/- 0.17 +/- 0.07 and a Lambda_b0 transverse production polarisation of 0.06 +/- 0.07 +/- 0.02 are measured, where the first uncertainty is statistical and the second systematic.
Theoretical predictions for the $\Lambda ^0_ b \to { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu} \Lambda $ decay asymmetry parameter $\alpha_b$ . |
Table_1.pdf [32 KiB] HiDef png [57 KiB] Thumbnail [27 KiB] tex code |
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Functions used to describe the angular distributions in three dimensions. |
Table_2.pdf [43 KiB] HiDef png [76 KiB] Thumbnail [36 KiB] tex code |
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Absolute systematic uncertainties on the measured parameters. |
Table_3.pdf [39 KiB] HiDef png [76 KiB] Thumbnail [36 KiB] tex code |
Created on 26 April 2024.