Measurement of diffractive dissociation cross sections in pp collisions at √s=7 TeV

Khachatryan, V. and Sirunyan, A. M. and Tumasyan, A. and Adam, W. and Bergauer, T. and Filipovic, Nicolas and Bencze, György and Hajdu, Csaba and Hidas, Pál and Horváth, Dezső and Siklér, Ferenc and Veszprémi, Viktor and Vesztergombi, György and Zsigmond, Anna Júlia and Karancsi, János and Molnár, József and Pálinkás, József and Trócsányi, Zoltán and Ujvári, Balázs and Veres, Gábor (2015) Measurement of diffractive dissociation cross sections in pp collisions at √s=7 TeV. PHYSICAL REVIEW D, 92 (1). ISSN 2470-0010

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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. Differ- ential cross sections are measured as a function of ξX = M2 X /s in the region −5.5 < log10 ξX < −2.5, for log10 MY < 0.5, dominated by single dissociation (SD), and 0.5 < log10 MY < 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 ∆η for ∆η > 3, log10 MX > 1.1, and log10 MY > 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/d∆ηF, for events with a pseudorapidity gap adjacent to the edge of the detector, is measured over ∆ηF = 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.

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