Please check my logic. 1. Hawking mechanism should give birth not only to photons, but also to their heavier analogs, Z for example. 2. Contrary to photons, massive Z bosons are not gradually red shifted, low energy Z simply fall back to BH, so the "red" part of the black-body spectrum of Z is cut. It is also distorted because Z has non-zero invariant mass. 3. Finally Z decay to photons, but the spectrum of these photons carry the "birth defect" - missing "red" part of the spectrum. 4. As a result, total Hawking radiation from BH has NOT a black-body spectrum because of massive particles. I understand that effect is tiny, but is my logic flawed?