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The electron spin resonance doublet indicating the width of the two spinoncontinuum in a spin-1/2 triangular-lattice Heisenberg antiferromagnet Cs2CuCl4was studied in high magnetic field. The doublet was found to collapse in amagnetic field of a half of the saturation field. The collapse of the doubletoccurs via vanishing of the high frequency component in a qualitative agreementwith the theoretical prediction for the S=1/2 chain. The field of the collapseis, however, much lower than expected for the S=1/2 chain. This is proposed tobe due to the destruction of frustration of interchain exchange bonds in amagnetic field, which restores the 2D character of this spin system. In thesaturated phase the mode with the Larmor frequency and a much weaker modedownshifted for 119~GHz are observed. The weak mode is of exchange origin, itdemonstrates a positive frequency shift at heating corresponding to therepulsion of magnons in the saturated phase.

High-field magnetic resonance of spinons and magnons in a triangular lattice S=1/2 antiferromagnet Cs2CuCl4