Revealing proton shape fluctuations with incoherent diffraction at high energy

Mäntysaari, Heikki; Schenke, Björn

doi:10.1103/physrevd.94.034042

Cited by 145 publications

(216 citation statements)

References 123 publications

(185 reference statements)

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“…While coherent diffractive dijet production allows to access the target's spatial geometry [4][5][6][7][8], inclusive and incoherent diffractive dijet cross sections are sensitive to multi-gluon correlations in the target [9,10] (see also [11][12][13][14][15]). In the near back-to-back correlation limit, where the mean dijet momentum is much larger than the recoil momentum, the inclusive dijet production cross section can be expressed in terms of the Weizsäcker-Williams transverse momentum dependent gluon distributions (TMDs), allowing experimental access to these fundamental quantities [9,[16][17][18][19].…”

mentioning

confidence: 99%

Multigluon Correlations and Evidence of Saturation from Dijet Measurements at an Electron-Ion Collider

et al. 2020

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We study inclusive and diffractive dijet production in electron-proton and electron-nucleus collisions within the Color Glass Condensate effective field theory. We compute dijet cross sections differentially in both mean dijet transverse momentum P and recoil momentum ∆, as well as the anisotropy in the relative angle between P and ∆. We use the nonlinear Gaussian approximation to compute multiparticle correlators for general small x kinematics, employing running coupling Balitsky-Kovchegov evolution to determine the dipole amplitude at small x. Our results cover a much larger kinematic range than accessible in previous computations performed in the correlation limit approximation, where it is assumed that |P | |∆|. We validate this approximation in its range of applicability and quantify its failure for |P | |∆|. We also predict significant targetdependent deviations from the correlation limit approximation for |P | > |∆| and |P | Qs, which offers a straightforward test of gluon saturation and access to multi-gluon distributions at a future electron ion collider. arXiv:1912.05586v1 [nucl-th]

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confidence: 99%

Multigluon Correlations and Evidence of Saturation from Dijet Measurements at an Electron-Ion Collider

et al. 2020

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“…The possibility to use incoherent J/ψ production to probe the proton substructure geometry was first demonstrated in Refs. [54,56] where the ab initio unknown proton substructure was parametrized as follows: first one assumes that the small-x gluons probed in exclusive vector meson production in HERA kinematics are distributed around three hot spots (e.g. valence quarks).…”

Section: Fluctuating Parton Densitiesmentioning

confidence: 99%

Imaging the nucleus with high-energy photons

Klein

Mäntysaari

2019

Nat Rev Phys

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In the 1930's, nuclear physicists developed the first realistic atomic models, showing that nuclei were made up of protons and neutrons. In the 1960's, Deep Inelastic Scattering experiments showed that protons and neutrons had internal structure: quarks and gluons (collectively, partons), and later experiments showed that the parton momentum distributions are different in heavy nuclei, compared to those in free nucleons. This difference is not surprising; partons are sensitive to their environment, and two gluons from different nucleons may fuse together, for example.Understanding how quarks and gluons behave in the nuclear environment is a significant focus of modern nuclear physics. Recent measurements have provided us with an improved understanding of how quark and gluon densities are altered in heavy nuclei. We have also begun to make multidimensional pictures of the nucleus, exploring how these alterations are distributed within heavy nuclei. We naturally expect these modifications to be largest in the core of a nucleus, and smaller near its periphery; this can change the effective shape of the nucleus. We have also started to explore the transverse momentum distribution of the partons in the nuclei, and, using incoherent photoproduction as a probe, study event-by-event fluctuations in nucleon and nuclei parton densities.This article will explore recent progress in measurements of nuclear structure at high energy, with some emphasis on these multi-dimensional pictures. We will also discuss how a future electron-ion collider (EIC) with high luminosity and center-of-mass energy will make exquisitely detailed images of partons in a nucleus.

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“…In particular, there is a lot of interest in trying to pin down higher moments or even the full distribution of the event-by-event fluctuations of observables, with a view to characterizing how hadrons look in individual events. For example, it has been proposed to use diffractive dissociation processes to constrain the fluctuations of the shape of the proton [1]. This contribution reports on an effort to understand the fluctuations of the integrated gluon density in the proton.…”

Section: Introductionmentioning

confidence: 99%

Distribution of the number of particles in the final state of hadron-nucleus collisions

Lorcé¹,

Domine²,

Munier³

et al. 2017

Proceedings of XXV International Workshop on Deep-Inelastic Scattering and Related Subjects — PoS(DIS2017)

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Recently, Liou, Mueller and Munier have argued that proton-nucleus collisions at the LHC may give access to the full statistics of the event-by-event fluctuations of the gluon density in the proton. Indeed, the number of particles produced in an event in rapidity slices in the fragmentation region of the proton may, under some well-defined assumptions, be directly related to the number of gluons which have a transverse momentum larger than the nuclear saturation scale present in the proton at the time of the interaction with the nucleus. A first calculation of the probability distribution of the number of gluons in a hadron was performed, using the color dipole model. In this talk, we review this proposal, and present preliminary numerical calculations which support the analytical results obtained so far.

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Revealing proton shape fluctuations with incoherent diffraction at high energy

Cited by 145 publications

References 123 publications

Multigluon Correlations and Evidence of Saturation from Dijet Measurements at an Electron-Ion Collider

Multigluon Correlations and Evidence of Saturation from Dijet Measurements at an Electron-Ion Collider

Imaging the nucleus with high-energy photons

Distribution of the number of particles in the final state of hadron-nucleus collisions

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