Identify the particle: Please help?

In a high-energy physics experiment, a subnuclear particle moves in a circular arc of 1.16�10-1 m radius perpendicular to a magnetic field of 2.70�10-2 T. The kinetic energy of the particle is determined to be 5.00�10-16 J. Identify the particle from its mass. The masses of the positron, pion, kaon, proton, muon and Dmeson are 9.10�10-31 kg, 2.50�10-28 kg, 8.84�10-28 kg, 1.67�10-27 kg, 1.88�10-28 kg and 3.35�10-27 kg, respectively. Assume that the particle is known to have a positive charge equal to the magnitude of the electron charge. Enter the name of the particle from the list given above