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? · **Massless Particles -** 01-06-2004, 11:17 PM

Must massless particles be absolutely massless in the SM? Being a non-scientist I find it hard to grasp the concept of a massless particle. How does gravity interact with a truely massless particle?

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? White Belt Status: Offline Posts: 6 Thanks Given: 0 Thanked 0x in 0 Posts Join Date: Jan 2004 Rep Power: 0	Massless Particles - 01-06-2004, 11:17 PM Must massless particles be absolutely massless in the SM? Being a non-scientist I find it hard to grasp the concept of a massless particle. How does gravity interact with a truely massless particle?