Using 1fb^{-1} of pp collision data collected at center of mass energy
sqrt{s} = 7 TeV during 2011 by the LHCb detector. Measurements of the triple
product asymmetries, polarisation amplitudes and strong phase difference in the
decay B_s^0 to phi phi are presented.Comment: Written for Moriond 2012 Electroweak Session. 4 pages, 3 figure