{
  "annotation_id": "7ad09d11-bc14-484b-8c45-231054aca7ce",
  "date_created": "2026-03-02T18:00:10.885000Z",
  "date_modified": "2026-03-02T18:00:10.885000Z",
  "file_hash": "fee3926ff9f340e4d7e9fe1c7026a68385a4f729872232c5cee3c563074c8c19",
  "private": false,
  "record": {
    "abstract": "The pion and quark annihilation mechanisms of dilepton production during\nrelativistic nuclear collisions are studied. We focus on the modifications\ncaused by the specific features of in-medium pion and quark states rather than\nby medium modification of the $\\rho $-meson spectral density. The main\ningredient emerging in our approach is a form-factor of the multi-pion\n(multi-quark) system. Replacing the usual delta-function the form-factor plays\nthe role of distribution which, in some sense, \"connects\" the total 4-momenta\nof the annihilating and outgoing particles. The difference between the c.m.s.\nvelocities attributed to annihilating and outgoing particles is a particular\nconsequence of this replacement and results in the appearance of a new factor\nin the formula for the lepton pair production rate. We obtained that the\nform-factor of the multi-pion (multi-quark) system causes broadening of the\nrate which is most pronounced for small invariant masses, in particular, we\nobtain a growth of the rate for the invariant masses below two masses of the\nannihilating particles.",
    "arxiv_id": "nucl-th/0612067",
    "authors": [
      "Dmitry Anchishkin"
    ],
    "categories": [
      "nucl-th"
    ],
    "doi": "10.1556/APH.27.2006.4.3",
    "title": "Annihilation Mechanisms of Lepton Pair Production in Relativistic   Nuclear Collisions",
    "url": "https://arxiv.org/abs/nucl-th/0612067"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "ed6532a9-3461-4b7e-a9c0-4a14a152fe53",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}