{
  "id": "0808.1526",
  "version": "v2",
  "published": "2008-08-11T15:22:10.000Z",
  "updated": "2009-03-02T15:14:58.000Z",
  "title": "Comment on \"Gauge Invariance and $k_T$-Factorization of Exclusive Processes\"",
  "authors": [
    "Hsiang-nan Li",
    "Satoshi Mishima"
  ],
  "comment": "7 pages, 5 figures, a co-author was added, new method was adopted, the conclusion remains the same",
  "journal": "Phys.Lett.B674:182,2009",
  "doi": "10.1016/j.physletb.2009.03.015",
  "categories": [
    "hep-ph"
  ],
  "abstract": "We point out mistakes made in the one-loop calculation of some diagrams for the process $\\pi \\gamma^* \\to \\gamma$ in the preprint arXiv:0807.0296, and present correct results. Especially, we have difficulty to understand their argument that a highly off-shell gluon generates a light-cone (infrared) singularity. It is shown by means of the Ward identity that the gauge-dependent light-cone singularity found in arXiv:0807.0296 does not exist. It is then shown that a hard kernel derived in the $k_T$ factorization of exclusive processes is gauge invariant and free of the light-cone singularity.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2009-03-02T15:14:58.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "exclusive processes",
      "gauge invariance",
      "factorization",
      "gauge-dependent light-cone singularity",
      "highly off-shell gluon generates"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "journal": "Physics Letters B",
      "year": 2009,
      "month": "Apr",
      "volume": 674,
      "number": 3,
      "pages": 182
    },
    "note": {
      "typesetting": "TeX",
      "pages": 7,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 792879,
      "adsabs": "2009PhLB..674..182L"
    }
  }
}