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A neutral particle decays into K+K with momenta PK+ = (1.628, 0.0897,0) GeV and PK- = (1.090,-0.0897,0) GeV. Find the mass of the neutral

A neutral particle decays into K+K with momenta PK+ = (1.628, 0.0897,0) GeV and PK- = (1.090,-0.0897,0) GeV. Find the mass of the neutral particle, given that the K= mass is 0.494 GeV 1.0054GeV 2.9038GeV O 2.7242 GeV O 1.0937GeV

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