Measurements of the Lambda_b0 -> J/psi Lambda decay amplitudes and the Lambda_b0 polarisation in pp collisions at sqrt(s) = 7 TeV
LHCb collaboration: R. Aaij, C. Abellan Beteta, B. Adeva, M. Adinolfi,, C. Adrover, A. Affolder, Z. Ajaltouni, J. Albrecht, F. Alessio, M. Alexander,, S. Ali, G. Alkhazov, P. Alvarez Cartelle, A.A. Alves Jr, S. Amato, S. Amerio,, Y. Amhis, L. Anderlini, J. Anderson
TL;DR
This paper presents an angular analysis of Lambda_b0 decays to measure decay amplitudes and polarization, providing insights into baryon decay dynamics at 7 TeV proton-proton collisions.
Contribution
It reports the first measurements of Lambda_b0 decay amplitudes and polarization in pp collisions at 7 TeV, using LHCb data.
Findings
Parity violating asymmetry parameter: 0.05 +/- 0.17 +/- 0.07
Lambda_b0 transverse polarization: 0.06 +/- 0.07 +/- 0.02
Results are consistent with Standard Model expectations.
Abstract
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.
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