{
  "id": 17017,
  "title": "Physical question about angels",
  "url": "/competitions/flavours-of-physics/discussion/17017",
  "author_name": "",
  "post_date": "2015-10-15T07:26:48.353Z",
  "votes": null,
  "comment_count": 3,
  "views": 437,
  "content": "<p>In real experiment do we know anything about angles between momentum vectors p0 p1 p2? Is this possible that these angles are constant (or almost constant)? </p>",
  "messages": [
    {
      "id": "96238",
      "postDate": "10/15/2015 07:26:48",
      "content": "<p>In real experiment do we know anything about angles between momentum vectors p0 p1 p2? Is this possible that these angles are constant (or almost constant)? </p>",
      "rawMarkdown": "In real experiment do we know anything about angles between momentum vectors p0 p1 p2? Is this possible that these angles are constant (or almost constant)?",
      "votes": null
    },
    {
      "id": "96241",
      "postDate": "10/15/2015 07:42:18",
      "content": "<p>Yes, the real experiment measures them, the full vector is reconstructed. They are far from constant.</p>\n\n<p>I suspect the reason why we were not given these angles is that otherwise one could reconstruct the pairs of decay products and treat those rows where one of the pairs is close to the phi mass differently because these are likely to come from the D_s -&gt; phi pi decays in the agreement test sample (see section 3.1 of the competition documentation pdf).</p>",
      "rawMarkdown": "Yes, the real experiment measures them, the full vector is reconstructed. They are far from constant.\r\n\r\nI suspect the reason why we were not given these angles is that otherwise one could reconstruct the pairs of decay products and treat those rows where one of the pairs is close to the phi mass differently because these are likely to come from the D_s -> phi pi decays in the agreement test sample (see section 3.1 of the competition documentation pdf).",
      "votes": null
    },
    {
      "id": "96311",
      "postDate": "10/15/2015 16:37:20",
      "content": "<p>Has someone been reading too much Dan Brown?</p>",
      "rawMarkdown": "Has someone been reading too much Dan Brown?",
      "votes": null
    },
    {
      "id": "96313",
      "postDate": "10/15/2015 16:50:39",
      "content": "<p>:-)))) Angles, of course. Unfortunately, I can not edit the title :-) This is the kind of mistake with which spellcheck doesn't help. Thanks. </p>",
      "rawMarkdown": ":-)))) Angles, of course. Unfortunately, I can not edit the title :-) This is the kind of mistake with which spellcheck doesn't help. Thanks.",
      "votes": null
    }
  ],
  "comments": [
    {
      "id": 96241,
      "author_name": "holzner",
      "author_url": "",
      "post_date": "10/15/2015 07:42:18",
      "content": "<p>Yes, the real experiment measures them, the full vector is reconstructed. They are far from constant.</p>\n\n<p>I suspect the reason why we were not given these angles is that otherwise one could reconstruct the pairs of decay products and treat those rows where one of the pairs is close to the phi mass differently because these are likely to come from the D_s -&gt; phi pi decays in the agreement test sample (see section 3.1 of the competition documentation pdf).</p>",
      "votes": null,
      "replies": []
    },
    {
      "id": 96311,
      "author_name": "scirpus",
      "author_url": "",
      "post_date": "10/15/2015 16:37:20",
      "content": "<p>Has someone been reading too much Dan Brown?</p>",
      "votes": null,
      "replies": []
    },
    {
      "id": 96313,
      "author_name": "chalmi",
      "author_url": "",
      "post_date": "10/15/2015 16:50:39",
      "content": "<p>:-)))) Angles, of course. Unfortunately, I can not edit the title :-) This is the kind of mistake with which spellcheck doesn't help. Thanks. </p>",
      "votes": null,
      "replies": []
    }
  ],
  "raw_markdown_by_id": {
    "96238": "In real experiment do we know anything about angles between momentum vectors p0 p1 p2? Is this possible that these angles are constant (or almost constant)?",
    "96241": "Yes, the real experiment measures them, the full vector is reconstructed. They are far from constant.\r\n\r\nI suspect the reason why we were not given these angles is that otherwise one could reconstruct the pairs of decay products and treat those rows where one of the pairs is close to the phi mass differently because these are likely to come from the D_s -> phi pi decays in the agreement test sample (see section 3.1 of the competition documentation pdf).",
    "96311": "Has someone been reading too much Dan Brown?",
    "96313": ":-)))) Angles, of course. Unfortunately, I can not edit the title :-) This is the kind of mistake with which spellcheck doesn't help. Thanks."
  },
  "source": "meta"
}