Measurement of diffraction dissociation cross sections in pp collisions at sqrt(s)=7 TeV

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  • 30 March 2015
Abstract
Measurements of diffractive dissociation cross sections in pp collisions at sqrt(s)=7 TeV are presented in kinematic regions defined by the masses M[X] and M[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 xi[X]= M[X]^2/s in the region -5.5 log[10]xi[X]<-2.5, for log[10]M[Y]1.1, and log[10]M[Y]>1.1, a region dominated by DD. The cross sections integrated over these regions are used to extract the total SD and DD cross sections. In addition, the inclusive differential cross section, d sigma /d Delta eta[F], for events with a pseudorapidity gap adjacent to the edge of the detector, is measured over Delta eta[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.

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