Exploring collective phenomena at the electron-ion collider

Shi, Yu; Wang, Lei; Wei, Shu-Yi; Xiao, Bo-Wen; Zheng, Liang

doi:10.1103/physrevd.103.054017

Cited by 14 publications

(19 citation statements)

References 81 publications

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“…( 30) is similar to the space-dependent photon flux defined in Ref. [85,86,89]. The approximation that leads to the result of (30) is called the generalized EPA or gEPA [71].…”

Section: Connection To Epamentioning

confidence: 93%

Lepton pair production in ultra-peripheral collisions

Wang,

Pu,

Wang

2021

Preprint

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The lepton pair production in ultra-peripheral collisions (UPC) is studied in the classical field approximation. We derive a general form of the cross section in terms of photon distributions which depend on the transverse momentum and coordinate based on the wave packet form of nuclear wave functions. Such a general form of the cross section in the classical field approximation contains the results of the generalized equivalent photon approximation (EPA) as well as the corrections beyond EPA in the Born approximation. By rewriting the general form of the cross section in light-cone coordinates, we find a good connection with the transverse momentum dependent distribution (TMD) factorization formalism in the Born approximation. Our numerical results are consistent with current experimental data.

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“…( 30) is similar to the space-dependent photon flux defined in Ref. [85,86,89]. The approximation that leads to the result of (30) is called the generalized EPA or gEPA [71].…”

Section: Connection To Epamentioning

confidence: 93%

Lepton pair production in ultra-peripheral collisions

Wang,

Pu,

Wang

2021

Preprint

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“…QCD − 1 GeV 2 [38]. Under these assumptions, the photon-nucleus interaction in UPCs proceeds as a vector meson-nucleus collision at an energy lower than that of the associated nucleus-nucleus collisions.…”

Section: Methodsmentioning

confidence: 99%

“…(3+1)D simulations when quantitatively studying collectivity in small collision systems, and demonstrates that the elliptic flow hierarchy between γ * +Pb and p+Pb collisions alone can not distinguish whether initial-state momentum anisotropies [38] or geometry dependent finalstate effects are the dominant sources of anisotropies in these small systems.…”

Section: Methodsmentioning

confidence: 99%

Collectivity in Ultra-Peripheral Pb+Pb Collisions at the Large Hadron Collider

Zhao¹,

Shen²,

Schenke³

2022

Preprint

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We present the first full (3+1)D dynamical simulations of ultra-peripheral Pb+Pb collisions at the Large Hadron Collider. Extrapolating from p+Pb collisions, we explore whether a quasi-real photon γ * interacting with the lead nucleus in an ultra-peripheral collision can create a manybody system exhibiting fluid behavior. Assuming strong final-state interactions, we provide model results for charged hadron multiplicity, identified particle mean transverse momenta, and charged hadron anisotropic flow coefficients, and compare them with experimental data from the ALICE and ATLAS collaborations. The elliptic flow hierarchy between p+Pb and γ * +Pb collisions is dominated by the difference in longitudinal flow decorrelations and reproduces the experimental data well. We have demonstrated that our theoretical framework provides a quantitative tool to study particle production and collectivity for all system sizes, ranging from central heavy-ion collisions to small asymmetric collision systems at the Relativistic Heavy-Ion Collider and the Large Hadron Collider and even at the future Electron-Ion Collider.

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“…It might also be possible to single out saturation effects by studying azimuthal correlations in the diffractive production of dihadron or dijets. This subject has been investigated recently for DIS and UPCs in [90][91][92][93][94][95].…”

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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Exploring collective phenomena at the electron-ion collider

Cited by 14 publications

References 81 publications

Lepton pair production in ultra-peripheral collisions

Lepton pair production in ultra-peripheral collisions

Collectivity in Ultra-Peripheral Pb+Pb Collisions at the Large Hadron Collider

Mining for Gluon Saturation at Colliders

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