Polarization Measurement of Λ_{c}^{+} and Λ[over ¯]_{c}^{-} Baryons in p-Ne Collisions at sqrt[s_{NN}]=68.6  GeV

The first measurement of the polarization of charm baryons by the LHCb experiment recorded in fixed-target mode is presented. The polarization of Λ_{c} baryons is studied in collisions of protons, at an energy of 2.51 TeV, incident on a gaseous target of neon, at a nucleon-nucleon center-of-mass energy of 68.6 GeV. The world's first measurement of separate-charge polarizations for Λ_{c}^{+} and Λ[over ¯]_{c}^{-} baryons is performed, determining P_{Λ_{c}^{+}}=(24±9±2)%, P_{Λ[over ¯]_{c}^{-}}=(-8±12±3)%, where the first uncertainty is statistical and the second systematic. The polarization is also measured in intervals of baryon transverse momentum and the Feynman-x variable.