Review of proton and nuclear shape fluctuations at high energy

Mäntysaari, Heikki

doi:10.1088/1361-6633/aba347

Cited by 79 publications

(53 citation statements)

References 163 publications

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“…[51][52][53][54] or Ref. [55] for a review. As the focus in this work is on the vector meson wave function which enters in calculations of both incoherent and coherent cross sections similarly, from now on we only consider coherent scattering here.…”

Section: A Exclusive Scatteringmentioning

confidence: 99%

Relativistic corrections to the vector meson light front wave function

2020

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We compute a light front wave function for heavy vector mesons based on long-distance matrix elements constrained by decay width analyses in the nonrelativistic QCD framework. Our approach provides a systematic expansion of the wave function in quark velocity. The first relativistic correction included in our calculation is found to be significant and crucial for a good description of the HERA exclusive J=ψ production data. When looking at cross section ratios between nuclear and proton targets, the wave function dependence does not cancel out exactly. In particular the fully nonrelativistic limit is found not to be a reliable approximation even in this ratio. The important role of the Melosh rotation to express the rest frame wave function on the light front is illustrated.

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Section: A Exclusive Scatteringmentioning

confidence: 99%

Relativistic corrections to the vector meson light front wave function

2020

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“…These studies have been extended to UPCs at RHIC in [86] where the effect of fluctuations also significantly increases the distribution at large t. Furthermore, they have also been explored for LHC energies in [87,88] where a model for the energy dependence of the number of hotspots has been introduced. For a comprehensive review on the subject of proton and nuclear shape fluctuations see in [89]). It might also be possible to single out saturation effects by studying azimuthal correlations in the diffractive production of dihadron or dijets.…”

Section: Diffractive Reactionsmentioning

confidence: 99%

Mining for Gluon Saturation at Colliders

Morreale

Salazar

2021

Universe

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Quantum chromodynamics (QCD) is the theory of strong interactions of quarks and gluons collectively called partons, the basic constituents of all nuclear matter. Its non-abelian character manifests in nature in the form of two remarkable properties: color confinement and asymptotic freedom. At high energies, perturbation theory can result in the growth and dominance of very gluon densities at small-x. If left uncontrolled, this growth can result in gluons eternally growing violating a number of mathematical bounds. The resolution to this problem lies by balancing gluon emissions by recombinating gluons at high energies: phenomena of gluon saturation. High energy nuclear and particle physics experiments have spent the past decades quantifying the structure of protons and nuclei in terms of their fundamental constituents confirming predicted extraordinary behavior of matter at extreme density and pressure conditions. In the process they have also measured seemingly unexpected phenomena. We will give a state of the art review of the underlying theoretical and experimental tools and measurements pertinent to gluon saturation physics. We will argue for the need of high energy electron-proton/ion colliders such as the proposed EIC (USA) and LHeC (Europe) to consolidate our knowledge of QCD knowledge in the small x kinematic domains.

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“…If one also considers vector meson production processes where the target can break up (but not exchange net color with the produced meson, the so called incoherent diffraction) one can access not only the average spatial structure of the target, but also the event-by-event fluctuations [12] (see [13] for a review). The predicted coherent (no breakup) and incoherent (with breakup) cross sections with (solid) and without (dashed) proton shape fluctuations constrained by the HERA data in Ref.…”

Section: Diffractionmentioning

confidence: 99%

Electron-Ion Collisions at the LHeC and FCC-he

Mäntysaari¹,

LHeC²

2021

Proceedings of 40th International Conference on High Energy Physics — PoS(ICHEP2020)

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The LHeC and the FCC-he will open a new realm in our understanding of nuclear structure and the dynamics in processes involving nuclei, in an unexplored kinematic domain. We review some of the recent studies as shown in the update of the 2012 LHeC CDR, including the determination of nuclear parton densities in the framework of global fits and for a single nucleus, inclusive and exclusive diffraction and the unique capabilities of these high-energy colliders for probing QCD dynamics in the non-linear regime of phase space.

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Review of proton and nuclear shape fluctuations at high energy

Abstract: This is a self-archived version of an original article. This version may differ from the original in pagination and typographic details.

Cited by 79 publications

References 163 publications

Relativistic corrections to the vector meson light front wave function

Relativistic corrections to the vector meson light front wave function

Mining for Gluon Saturation at Colliders

Electron-Ion Collisions at the LHeC and FCC-he

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