Measurement of diffractive dissociation cross sections in pp collisions at √s = 7 TeV
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; Lai, Yue Shi; Lee, Yen-Jie; Levin, Andrew Michael; Ma, Teng; Paus, Christoph M. E.; Ralph, Duncan Kelley; Stephans, George S. F.; Velicanu, Dragos Alexandru; Veverka, Jan; Wyslouch, Boleslaw; Yang, Mingming; Zanetti, Marco; Roland, Christof E; Roland, Gunther M; Stoeckli, Fabian; Sumorok, Konstanty C; Wyslouch, Victoria; Bauer, Gerry P; Chan, M.; Luckey Jr, P David; ... Show more Show less
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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.
Date issued
2015-07Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science; Massachusetts Institute of Technology. School of ScienceJournal
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
ISSN
1550-7998
1550-2368