Abstract
We present the review of the recent results on diffraction from the LHC. Presented at EDSBlois2015 The 16th conference on Elastic and Diffractive Scattering REVIEW OF DIFFRACTION AT THE LHC∗ 1 Robert Ciesielski 2 The Rockefeller Univesity 1230 York Avenue, New York, NY 10065, USA 3 on behalf of the ALICE, ATLAS, LHCb, CMS and TOTEM Collaborations 4 We present the review of the recent results on diffraction from the LHC. 5 PACS numbers: 12.38.QK,13.85.-t,13.85.Dz,13.85.Lg 6
Highlights
In hadron-hadron scattering a substantial fraction of the total cross section can be attributed to diffractive interactions, characterized by the presence of at least one non-exponentially suppressed large rapidity gap (LRG), i.e. a region of pseudorapidity η devoid of particles
The LRG is associated with a color-singlet exchange carrying the vacuum quantum numbers, commonly referred to as pomeron exchange
Measurements of diffractive cross sections at the LHC provide a valuable input for understanding diffraction and improving its theoretical description
Summary
In hadron-hadron scattering a substantial fraction of the total cross section can be attributed to diffractive interactions, characterized by the presence of at least one non-exponentially suppressed large rapidity gap (LRG), i.e. a region of pseudorapidity η devoid of particles. Quantum Chromodynamics (pQCD), and are commonly described by phenomenological models. Predictions of these models generally differ when extrapolated from Tevatron center-of-mass energies to LHC. Together with the total and elastic cross section results, are crucial for the proper modeling of the full final state of hadronic interactions in event generators, and the simulation of hadronic showers in cosmic ray physics. Hard diffraction events are especially interesting because they can be studied in terms of pQCD, providing an opportunity to investigate the nature of the pomeron in terms of quarks and gluons, and to establish a link between soft and hard regimes. Exclusive production of simple idenitified final states reveals an interesting connection between diffraction and the physics of heavy-ion collisions through the concept of saturation in the regime of high parton densities; and offers the possibility for searches for beyond-Standard-Model phenomena or exotic particles, such as glueballs
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