Abstract

The main parts of the LHC diffractive physics programme possible to be measured using a proton tagging technique are presented. The geometric acceptance of the ATLAS forward proton detectors: ALFA and AFP for various LHC optics settings are shown. The probabilities of observing a proton originating from a minimum-bias event in ALFA and AFP stations are given. The main properties of single diffractive and double Pomeron exchange production of dijets, photon+jet, jet-gap-jet and W/Z bosons are discussed. The possibility of measuring the jet production in exclusive (double proton tag) and semi-exclusive (single tag) mode is evaluated.

Highlights

  • The main parts of the LHC diffractive physics programme possible to be measured using a proton tagging technique are presented

  • The studies were performed for the ATLAS detector [1] case but the conclusions are valid for a similar set of detectors installed around the CMS/TOTEM1 Interaction Point [4]

  • The LHC gives a possibility to study the properties of diffractive physics in a new kinematic domain

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Summary

Diffractive production

Diffractive processes are an important part of the physics programme at hadron colliders. This is true for the LHC, where a large community works on both theoretical and experimental aspects of diffraction. If a colourless object is exchanged by colliding protons, they may stay intact, lose a part of their energy and be scattered at very small angles (typically into the accelerator beam pipe). This paper discusses the selected processes in which one or both interacting protons stay intact. It focuses on the events containing a hard scale in the final state: high-pT jets and W/Z bosons. At the LHC, such measurements can be done by ATLAS and CMS/TOTEM experiments

ATLAS forward detectors
Pile-up
Hard diffraction
SD and DPE jet production
Jet–gap–jet production
Exclusive jet production
New physics
Findings
Summary
Full Text
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