{
  "id": 61681,
  "title": "Do short-lived particles leave a track?",
  "url": "/competitions/trackml-particle-identification/discussion/61681",
  "author_name": "",
  "post_date": "2018-07-22T09:54:39.172170700Z",
  "votes": null,
  "comment_count": 3,
  "views": 0,
  "content": "<p>In <a href=\"https://storage.googleapis.com/kaggle-forum-message-attachments/321278/9331/trackml-participant-document-particle-v1.0.pdf\">trackml-participant-document-particle-v1.0.pdf</a> it is stated:</p>\n\n<blockquote>\n  <p>a small fraction of the particles come from short-lived unstable heavy\n  particles flying a few millimeter</p>\n</blockquote>\n\n<p>Does a short-lived particle leave a track? Will we find a short track splitting at the end to a few tracks?</p>\n\n<p>(I did found few tracks starting far from the origin and having the same starting point)</p>",
  "messages": [
    {
      "id": "360374",
      "postDate": "07/22/2018 09:54:39",
      "content": "<p>In <a href=\"https://storage.googleapis.com/kaggle-forum-message-attachments/321278/9331/trackml-participant-document-particle-v1.0.pdf\">trackml-participant-document-particle-v1.0.pdf</a> it is stated:</p>\n\n<blockquote>\n  <p>a small fraction of the particles come from short-lived unstable heavy\n  particles flying a few millimeter</p>\n</blockquote>\n\n<p>Does a short-lived particle leave a track? Will we find a short track splitting at the end to a few tracks?</p>\n\n<p>(I did found few tracks starting far from the origin and having the same starting point)</p>",
      "rawMarkdown": "In [trackml-participant-document-particle-v1.0.pdf][1] it is stated:\n\n&gt; a small fraction of the particles come from short-lived unstable heavy\nparticles flying a few millimeter\n\nDoes a short-lived particle leave a track? Will we find a short track splitting at the end to a few tracks?\n\n(I did found few tracks starting far from the origin and having the same starting point)\n\n  [1]: https://kaggle2.blob.core.windows.net/forum-message-attachments/321278/9331/trackml-participant-document-particle-v1.0.pdf",
      "votes": null
    },
    {
      "id": "360748",
      "postDate": "07/23/2018 06:46:55",
      "content": "<p>Answering to my self: <strong>yes they do</strong>.\nLook at particles 671044041076379649, 671044041076383746, 671044041059598336 in event 00001000.\nSeems like particle 671044041059598336 leave a very short trace (2 hits) and then splits to particles  671044041076379649, 671044041076383746 which originate adjacent to the place  671044041059598336 was last seen.</p>",
      "rawMarkdown": "Answering to my self: **yes they do**.\nLook at particles 671044041076379649, 671044041076383746, 671044041059598336 in event 00001000.\nSeems like particle 671044041059598336 leave a very short trace (2 hits) and then splits to particles  671044041076379649, 671044041076383746 which originate adjacent to the place  671044041059598336 was last seen.",
      "votes": null
    },
    {
      "id": "360750",
      "postDate": "07/23/2018 06:51:44",
      "content": "<p>There are two different things : mentioned here are particles traveling and decaying \"on their own\". If they decay after a few millimeters they have not crossed any detector, so the particle is unseen, only its \"children\".  But there are also particles interacting with the detector itself (it is destroyed and there are children particles emitted), the interaction can take place in the middle of the detector, so there is a chance one can see the original particle.</p>",
      "rawMarkdown": "There are two different things : mentioned here are particles traveling and decaying \"on their own\". If they decay after a few millimeters they have not crossed any detector, so the particle is unseen, only its \"children\".  But there are also particles interacting with the detector itself (it is destroyed and there are children particles emitted), the interaction can take place in the middle of the detector, so there is a chance one can see the original particle.",
      "votes": null
    },
    {
      "id": "360754",
      "postDate": "07/23/2018 06:57:30",
      "content": "<p>Thanks. This might be a hint on how to find particles starting far from the origin.</p>",
      "rawMarkdown": "Thanks. This might be a hint on how to find particles starting far from the origin.",
      "votes": null
    }
  ],
  "comments": [
    {
      "id": 360748,
      "author_name": "yuval6967",
      "author_url": "",
      "post_date": "07/23/2018 06:46:55",
      "content": "<p>Answering to my self: <strong>yes they do</strong>.\nLook at particles 671044041076379649, 671044041076383746, 671044041059598336 in event 00001000.\nSeems like particle 671044041059598336 leave a very short trace (2 hits) and then splits to particles  671044041076379649, 671044041076383746 which originate adjacent to the place  671044041059598336 was last seen.</p>",
      "votes": null,
      "replies": []
    },
    {
      "id": 360750,
      "author_name": "droussea",
      "author_url": "",
      "post_date": "07/23/2018 06:51:44",
      "content": "<p>There are two different things : mentioned here are particles traveling and decaying \"on their own\". If they decay after a few millimeters they have not crossed any detector, so the particle is unseen, only its \"children\".  But there are also particles interacting with the detector itself (it is destroyed and there are children particles emitted), the interaction can take place in the middle of the detector, so there is a chance one can see the original particle.</p>",
      "votes": null,
      "replies": [
        {
          "id": 360754,
          "author_name": "yuval6967",
          "author_url": "",
          "post_date": "07/23/2018 06:57:30",
          "content": "<p>Thanks. This might be a hint on how to find particles starting far from the origin.</p>",
          "votes": null,
          "replies": []
        }
      ]
    }
  ],
  "raw_markdown_by_id": {
    "360374": "In [trackml-participant-document-particle-v1.0.pdf][1] it is stated:\n\n&gt; a small fraction of the particles come from short-lived unstable heavy\nparticles flying a few millimeter\n\nDoes a short-lived particle leave a track? Will we find a short track splitting at the end to a few tracks?\n\n(I did found few tracks starting far from the origin and having the same starting point)\n\n  [1]: https://kaggle2.blob.core.windows.net/forum-message-attachments/321278/9331/trackml-participant-document-particle-v1.0.pdf",
    "360748": "Answering to my self: **yes they do**.\nLook at particles 671044041076379649, 671044041076383746, 671044041059598336 in event 00001000.\nSeems like particle 671044041059598336 leave a very short trace (2 hits) and then splits to particles  671044041076379649, 671044041076383746 which originate adjacent to the place  671044041059598336 was last seen.",
    "360750": "There are two different things : mentioned here are particles traveling and decaying \"on their own\". If they decay after a few millimeters they have not crossed any detector, so the particle is unseen, only its \"children\".  But there are also particles interacting with the detector itself (it is destroyed and there are children particles emitted), the interaction can take place in the middle of the detector, so there is a chance one can see the original particle.",
    "360754": "Thanks. This might be a hint on how to find particles starting far from the origin."
  },
  "source": "meta"
}