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Hunting for QCD instantons at the LHC in events with large rapidity gaps

Khoze, V. A.; Khoze, V. V.; Milne, D. L.; Ryskin, M. G.

Hunting for QCD instantons at the LHC in events with large rapidity gaps Thumbnail


Daniel Milne
PGR Student Doctor of Philosophy

M. G. Ryskin


We outline a strategy of how to search for QCD instantons of invariant mass 20–60 GeVin diffractive events in low-luminosity runs at the LHC. We show that, by imposing appropriate selection criteria on the final states, one can select the kinematic regime where the instanton signal exceeds the background by a factor of at least 8. In spite of the relatively strong cuts that we impose on the total transverse energy and the number of charged tracks, P i ET;i > 15 GeV and Nch > 20 measured within the 0 < η < 2 interval and excluding events with high-pT particles, the expected cross section is sufficiently large to study the instanton production in events with large rapidity gaps at low luminosities, thus avoiding problems with pileup. The paper also includes an updated computation of instanton cross sections and other parameters relevant for ongoing studies.

Journal Article Type Article
Acceptance Date Aug 19, 2021
Online Publication Date Sep 14, 2021
Publication Date 2021
Deposit Date Nov 23, 2021
Publicly Available Date Nov 23, 2021
Journal Physical Review D
Print ISSN 2470-0010
Electronic ISSN 2470-0029
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 104
Issue 5
Public URL


Published Journal Article (583 Kb)

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Copyright Statement
Published by the American Physical Society under the terms of
the Creative Commons Attribution 4.0 International license.
Further distribution of this work must maintain attribution to
the author(s) and the published article’s title, journal citation,
and DOI. Funded by SCOAP3.

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