Abstract
The ATLAS Collaboration has carried out a study of di ractive dijet produc- tion in proton-proton collisions at a centre-of-mass energy of p s = 7 TeV at the LHC. The data distributions are compared with Monte Carlo models and the rapidity gap sur- vival probability has been estimated in the kinematic region with high di ractive contri- bution. Prospects for exclusive jet production studies with the forward proton tagging capability of the AFP sub-detector of ATLAS are also discussed. First results based on data taken jointly with the ATLAS and the LHCf detectors in a p+Pb run will also be shown. In addition, the measurement of the cross-section for the exclusive production of di-lepton pairs in pp collisions at p s = 7 TeV is discussed.
Highlights
Diffractive interaction can be defined as a process in which an object carrying vacuum quantum numbers is exchanged
Central production — when a system Z is produced in the final state and the incoming protons can dissociate into separate hadronic systems with proton quantum numbers or stay intact
In the non-diffractive interactions the produced systems and proton remnants are not clearly separated, because the mediating particle carries a charge and radiates particles and fills the space between the systems. This does not happen in the diffractive interactions and the probability of the dissociated systems to be well separated in pseudorapidity is relatively large
Summary
Diffractive interaction can be defined as a process in which an object carrying vacuum quantum numbers is exchanged. Single diffractive dissociation — when one of the incoming protons emerges from the interaction and the other one dissociates into a system X which quantum numbers are the same as of incoming proton,. Double diffractive dissociation — when each of the incoming protons dissociate into systems X and Y, respectively, each of the systems has proton quantum numbers,. In the non-diffractive interactions the produced systems and proton remnants are not clearly separated, because the mediating particle carries a charge and radiates particles and fills the space between the systems. This does not happen in the diffractive interactions and the probability of the dissociated systems to be well separated in pseudorapidity is relatively large. In cases when it is not possible to measure the scattered proton, this property is utilised to experimentally identify the diffractive interactions
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