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Measurement of diffractive dissociation cross sections in pp collisions at s√=7 TeV
Baringer, Philip S. Bean, Alice Murray, Michael J. Sanders, Stephen J. CMS Collaboration
Baringer, Philip S.
Bean, Alice
Murray, Michael J.
Sanders, Stephen J.
CMS Collaboration
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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=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, 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)+0.32−0.29(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 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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2015-07-06
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American Physical Society
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Khachatryan, V., Sirunyan, A. M., Tumasyan, A., Adam, W., Bergauer, T., Dragicevic, M., … Frühwirth, R. (2015). Measurement of diffractive dissociation cross sections in p p collisions at s = 7 TeV . Phys. Rev. D, 92(1). doi:10.1103/physrevd.92.012003