Measurement of diffractive dissociation cross sections inppcollisions ats=7  TeV

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Abstract
Measurements of diffractive dissociation cross sections in pp collisions at s=7  TeV are presented in kinematic regions defined by the masses MX and MY of the two final-state hadronic systems separated by the largest rapidity gap in the event. Differential cross sections are measured as a function of ξX=MX2/s in the region −5.5<log10ξX<−2.5, for log10MY<0.5, dominated by single dissociation (SD), and 0.5<log10MY<1.1, dominated by double dissociation (DD), where MX and MY are given in GeV. The inclusive pp cross section is also measured as a function of the width of the central pseudorapidity gap Δη for Δη>3, log10MX>1.1, and log10MY>1.1, a region dominated by DD. The cross sections integrated over these regions are found to be, respectively, 2.99±0.02(stat)−0.29+0.32(syst)  mb, 1.18±0.02(stat)±0.13(syst)  mb, and 0.58±0.01(stat)−0.11+0.13(syst)  mb, and are used to extract extrapolated total SD and DD cross sections. In addition, the inclusive differential cross section, dσ/dΔηF, for events with a pseudorapidity gap adjacent to the edge of the detector, is measured over ΔηF=8.4 units of pseudorapidity. The results are compared to those of other experiments and to theoretical predictions and found compatible with slowly rising diffractive cross sections as a function of center-of-mass energy.
Funding Information
  • Ministry of Science and Technology of the People’s Republic of China
  • Austrian Science Fund
  • Conselho Nacional de Desenvolvimento Científico e Tecnológico
  • Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
  • Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro
  • Fundação de Amparo à Pesquisa do Estado de São Paulo
  • Chinese Academy of Sciences
  • National Natural Science Foundation of China
  • Departamento Administrativo de Ciencia, Tecnologia e Innovacion
  • Ministry of Science and Technology, Croatia
  • Hrvatska Zaklada za Znanost
  • Research Promotion Foundation
  • Haridus- ja Teadusministeerium
  • Suomen Akatemia
  • Bundesministerium für Bildung und Forschung
  • Deutsche Forschungsgemeinschaft
  • Department of Atomic Energy, Government of India
  • Department of Science and Technology, Ministry of Science and Technology
  • Istituto Nazionale di Fisica Nucleare
  • Ministry of Science, ICT and Future Planning
  • National Research Foundation of Korea
  • Ministry of Education
  • Consejo Nacional de Ciencia y Tecnología
  • Ministry of Business, Innovation and Employment
  • Fundação para a Ciência e a Tecnologia
  • National Science and Technology Development Agency
  • U.S. Department of Energy
  • National Science Foundation
  • European Research Council
  • A.G. Leventis Foundation
  • Alfred P. Sloan Foundation
  • Alexander von Humboldt-Stiftung
  • Fonds pour la Formation à la Recherche dans l’Industrie et dans l’Agriculture
  • Agentschap voor Innovatie door Wetenschap en Technologie
  • Ministry of Education Youth and Science
  • Ministerstvo Pr?myslu a Obchodu
  • Fundacja na rzecz Nauki Polskiej
  • Seventh Framework Programme
  • Compagnia di San Paolo
  • Ministero dell’Istruzione, dell’Università e della Ricerca