/ hep-ex CMS-FSQ-12-005

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

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]<0.5, dominated by single dissociation (SD), and 0.5<log[10]M[Y]<1.1, dominated by double dissociation (DD), where M[X] and M[Y] are given in GeV. The inclusive pp cross section is also measured as a function of the width of the central pseudorapidity gap Delta eta for Delta eta>3, log[10]M[X]>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.

Note: *Temporary entry*; Submitted to Phys. Rev. D

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Запись создана 2015-04-01, последняя модификация 2015-04-01

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