Abstract
The first double diffractive cross-section measurement in the very forward region has been carried out by the TOTEM experiment at the LHC with a center-of-mass energy of sqrt[s]=7 TeV. By utilizing the very forward TOTEM tracking detectors T1 and T2, which extend up to |η|=6.5, a clean sample of double diffractive pp events was extracted. From these events, we determined the cross section σDD=(116±25) μb for events where both diffractive systems have 4.7<|η|min<6.5.
Highlights
Background estimateTrigger efficiencyPileup correction T1 multiplicityLuminosity min Total uncertainty15.4 11.0 1.5 2.9 2.9 24.8 19.6 4.8 5.1 4.9 difference with respect to QGSJET-II-03 [16] and PHOJET was taken as the uncertainty
Monte Carlo simulations underestimate the number of secondary particles
recalculated cross section was taken as the systematic uncertainty
Summary
The SD background estimation starts from the calculation of the number of SD events in the SD dominated control sample, 1T2 þ 0T1, by subtracting the number of other kinds of events from the number of data events, NS1DT2þ0T1 1⁄4 Nd1aTt2aþ0T1 À ND1TD2þ0T1 À NN1TD2þ0T1.
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