Simon Taufel, the senior international umpire, has referred Phil Hughes' second innings lbw dismissal in the first Test between Sri Lanka and Australia to the ICC as a serious question mark against the accuracy of Hawk-Eye, the ball tracking technology. Taufel and the officiating umpires Richard Kettleborough, Aleem Dar and Tony Hill have have also sent the relevant footage of the incident to the ICC's cricket operations department.
http://www.espncricinfo.com/sri-lanka-v-australia-2011/content/current/story/530864.html
http://www.espncricinfo.com/sri-lanka-v-australia-2011/content/current/story/530864.html