1 Ocak 2015 Dergi makalesi Açık Erişim

CERN İşbirliği

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{
  "@context": "https://schema.org/", 
  "@id": 108079, 
  "@type": "ScholarlyArticle", 
  "creator": [
    {
      "@type": "Person", 
      "affiliation": "CERN", 
      "name": "CERN \u0130\u015fbirli\u011fi"
    }
  ], 
  "datePublished": "2015-01-01", 
  "description": "<p>We have performed the first measurement of the coherent \u03c8(2S) photo-production cross section in ultra-peripheral Pb Pb collisions at the LHC. This charmonium excited state is reconstructed via the \u03c8(2S)\u2192l+l\u2212 and \u03c8(2S)\u2192J/\u03c8\u03c0+\u03c0\u2212 decays, where the J/\u03c8 decays into two leptons. The analysis is based on an event sample corresponding to an integrated luminosity of about 22\u00a0\u03bcb\u22121 . The cross section for coherent \u03c8(2S) production in the rapidity interval \u22120.9&lt;y&lt;0.9 is d\u03c3\u03c8(2S)coh/dy=0.83\u00b10.19(stat+syst)\u00a0mb . The \u03c8(2S) to J/\u03c8 coherent cross section ratio is 0.34\u22120.07+0.08(stat+syst) . The obtained results are compared to predictions from theoretical models.</p>", 
  "headline": "Coherent \u03c8 (2S) photo-production in ultra-peripheral Pb Pb collisions at sNN=2.76\u00a0TeV", 
  "identifier": 108079, 
  "image": "https://aperta.ulakbim.gov.tr/static/img/logo/aperta_logo_with_icon.svg", 
  "license": "http://www.opendefinition.org/licenses/cc-by", 
  "name": "Coherent \u03c8 (2S) photo-production in ultra-peripheral Pb Pb collisions at sNN=2.76\u00a0TeV", 
  "url": "https://aperta.ulakbim.gov.tr/record/108079"
}