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Title: Measurement of diffraction dissociation cross sections in pp collisions at $$\sqrt{s}$$ = 7 TeV

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. The differential cross sections are measured as a function of ξX = M2X /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, log10 MX > 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)+0.32-0.29(syst) mb, 1.18 ± 0.02(stat) ± 0.13(syst) mb, and 0.58 ± 0.01(stat)+0.13-0.11(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 tomore » 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.« less
Authors:
 [1]
  1. Yerevan Physics Inst. (YerPhI), Yerevan (Armenia). et al.
Publication Date:
Report Number(s):
FERMILAB-PUB-15-110-CMS; CERN-PH-EP-2015-062; CMS-FSQ-12-005
Journal ID: ISSN 1550-7998; arXiv eprint number arXiv:1503.08689; TRN: US1600878
Grant/Contract Number:
AC02-76CH03000; AC02-07CH11359
Type:
Published Article
Journal Name:
Physical Review. D, Particles, Fields, Gravitation and Cosmology
Additional Journal Information:
Journal Volume: 92; Journal Issue: 01; Journal ID: ISSN 1550-7998
Publisher:
American Physical Society (APS)
Research Org:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Orgs:
CMS Collaboration
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
OSTI Identifier:
1198665
Alternate Identifier(s):
OSTI ID: 1221287