Measurement of diffractive dissociation cross sections in pp collisions at √s = 7 TeV
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Khachatryan-2015-Measurement of diffractive.pdf
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Author(s)
Apyan, Aram
Barbieri, Richard Alexander
Busza, Wit
Cali, Ivan Amos
Di Matteo, Leonardo
Dutta, Valentina
Gomez-Ceballos, Guillelmo
Goncharov, Maxim
Gulhan, Doga Can
Klute, Markus
Date Issued
July 2015
Journal
Physical Review D
Publisher
American Physical Society
Citation
Khachatryan, V., A. M. Sirunyan, A. Tumasyan, W. Adam, T. Bergauer, M. Dragicevic, J. Ero, et al. “Measurement of Diffractive Dissociation Cross Sections in pp Collisions at √s = 7 TeV.” Phys. Rev. D 92, no. 1 (July 2015). © 2015 CERN, for the CMS Collaboration
Version
Final published version
Abstract
Measurements of diffractive dissociation cross sections in pp collisions at √s = 7 TeV are presented in kinematic regions defined by the masses M[subscript X] and M[subscript Y] 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 ξ[subscript X] = M[2 over X]/s in the region −5.5 < log[subscript 10]ξ[subscript X] < −2.5, for log[subscript 10]M[subscript Y] < 0.5, dominated by single dissociation (SD), and 0.5 < log[subscript 10]M[subscript Y] < 1.1, dominated by double dissociation (DD), where M[subscript X] and M[subscript Y] 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 Δ[subscript η] > 3, log[subscript 10]M[subscript X] > 1.1, and log[subscript 10]M[subscript Y] > 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 over −0.29](syst) mb, 1.18 ± 0.02(stat) ± 0.13(syst) mb, and 0.58 ± 0.01(stat)[+0.13 over −0.11](syst) mb, and are used to extract extrapolated total SD and DD cross sections. In addition, the inclusive differential cross section, dσ/dΔη[superscript F], for events with a pseudorapidity gap adjacent to the edge of the detector, is measured over Δη[superscript F] = 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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
Massachusetts Institute of Technology. School of Science
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DOI of Published Version
https://doi.org/10.1103/PhysRevD.92.012003
