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

Khoze, V.A.; Milne, Daniel; Ryskin, M.G.

doi:10.1103/physrevd.104.054013

Cited by 5 publications

(6 citation statements)

References 57 publications

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“…In Ref. [15,22] it was proposed to search for QCD instantons at the LHC in events with Large Rapidity Gaps. Here we investigate the search strategy for the case of heavy instanton by tagging leading protons with dedicated AFP or CT-PPS forward proton detectors at √ s = 14 TeV.…”

Section: Discussionmentioning

confidence: 99%

“…Indeed, it was demonstrated in Ref. [15] that in this case there is a good chance to observe the instanton signal at the LHC. Recall that the kinematics considered in Ref.…”

Section: Introductionmentioning

confidence: 85%

“…Finally we remind that the decay of the instanton produces one additional pair of each flavour of light (m f < 1/ρ) quark [11,13,15]. So in the case of the signal, we expect to observe a larger number of strange and charm particles than in background events.…”

Section: Potential Improvementsmentioning

confidence: 96%

“…Recall that the kinematics considered in Ref. [15] corresponds to the LRG events, selected by observing the leading proton which carries away a very close to 1 (x L ∼ 0.997) fraction of its initial momentum in the ALFA or TOTEM detectors [16,17]. Since the remaining energy is quite small, the mass of the instanton is not too large: M inst ∼ 20−40 GeV.…”

Section: Introductionmentioning

confidence: 99%

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Searches for QCD instantons with forward proton tagging

et al. 2023

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We study the possibility to observe heavy ($$M_{\textrm{inst}}> 60$$ M inst > 60 GeV) QCD instantons at the LHC in events with one or two tagged leading protons including fast simulation of detector and pile-up effects. We show that the expected instanton signal in a single-tagged configuration is strongly affected by central detector and pile-up effects. For double-tagged approach, where larger integrated luminosities and hence larger pile-up contaminations need to be considered, the combinatorial background overwhelms the expected signal. We suggest that additional time information about tracks at central and forward rapidities would be crucial for potential improvements.

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Section: Discussionmentioning

confidence: 99%

“…Indeed, it was demonstrated in Ref. [15] that in this case there is a good chance to observe the instanton signal at the LHC. Recall that the kinematics considered in Ref.…”

Section: Introductionmentioning

confidence: 85%

Section: Potential Improvementsmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

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Searches for QCD instantons with forward proton tagging

et al. 2023

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“…As discussed in [438,439] the experiments with forward proton spectrometers at the HL-LHC would open a promising way to perform a search for the QCD instantons, which are a non-trivial consequence of the vacuum structure of the non-abelian theories (for a recent review and references see e.g. [440]).…”

Section: Physics Perspectives At Hl -Lhcmentioning

confidence: 99%

White Paper on Forward Physics, BFKL, Saturation Physics and Diffraction

Hentschinski¹,

Royon²,

Peredo³

et al. 2022

Preprint

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The goal of this white paper is to give a comprehensive overview of the rich field of forward physics. We discuss the occurrences of BFKL resummation effects in special final states, such as Mueller-Navelet jets, jet gap jets, and heavy quarkonium production.It further addresses TMD factorization at low x and the manifestation of a semi-hard saturation scale in (generalized) TMD PDFs. More theoretical aspects of low x physics, probes of the quark gluon plasma, as well as the possibility to use photon-hadron collisions at the LHC to constrain hadronic structure at low x, and the resulting complementarity between LHC and the EIC are also presented. We also briefly discuss diffraction at colliders as well as the possibility to explore further the electroweak theory in central exclusive events using the LHC as a photon-photon collider. CONTENTS I. Introduction II. Manifestations of BFKL evolution A. Mueller-Navelet jets B. Toward precision studies of BFKL dynamics C. Unintegrated gluon distribution (UGD) D. BFKL resummation of NLO collinear factorization: Heavy quarkonium production E. Diffraction: Gaps between jets III. Hadronic Structure at low x and gluon saturation A. Color Glass Condensate and high gluon densities B. Transverse Momentum Dependent Parton Distribution Functions C. Complementarity between EIC and LHC D. Forward dijets: from LHC to EIC E. Color Glass Condensate beyond high energy factorization IV. Imprints of high gluon densities at low x at the LHC. A. Open QCD questions at a hadron-hadron collider: Parton fragmentation, mini-jets and their interplay with high parton densities B. Forward direct photon measurements 27 C. Top quark pair production as a tool to probe Quark-Gluon -Plasma formation 29 V. Ultra-peripheral collisions at hadronic colliders and exclusive reactions at the EIC 31 A. Existing measurements on diffractive vector meson photoproduction in UPCs 31 B. Future measurements on diffractive vector meson photoproduction in UPCs 33 C. The ratio of Ψ(2s) and J/Ψ photoproduction cross-sections as a tool to quantify non-linear QCD evolution 34 D. Planned measurements at the Electron Ion Collider 36 VI. Odderon discovery and diffractive jets 38 A. Soft diffraction and the Odderon discovery by the D0 and TOTEM experiments 38 B. Inclusive diffraction measurements at the LHC and sensitivity to the Pomeron structure 39 VII. Electroweak and Beyond the Standard Model Physics 41 A. Precision Proton Spectrometer (PPS) and ATLAS Forward Proton detector (AFP) at high luminosity 41 B. Non-elastic contribution in photon-photon physics 44 C. Exclusive production of Higgs boson 47 D. Anomalous quartic couplings with proton tagging 49 VIII. Conclusions 53 Acknowledgements 54 References 55

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