The Electron-Ion Collider: Assessing the Energy Dependence of Key Measurements

Aschenauer, E. C.; Fazio, S.; Lee, J.H.; Mäntysaari, Heikki; Page, B. S.; Schenke, Bjoern; Ullrich, T.; Venugopalan, Raju; Zurita, Pía

doi:10.2172/1425111

Cited by 17 publications

(22 citation statements)

References 127 publications

(199 reference statements)

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“…The EIC would collide electrons with protons and nuclei using a range of different beam energy configurations and nucleon species, pinning down nuclear modifications of the free-nucleon PDFs down to x 5 × 10 −4 . Such a machine would therefore significantly improve our understanding of the strong interaction in the nuclear medium, in a similar way as it would with the spin structure of the nucleons [111][112][113]. Another option in discussion is the Large Hadron electron Collider (LHeC) [114], which would operate concurrently with the High-Luminosity LHC and would further extend the low-x coverage of lepton-nucleus reactions down to x 10 −6 .…”

Section: Nuclear Pdfs At the Electron-ion Collidermentioning

confidence: 99%

Nuclear parton distributions from lepton-nucleus scattering and the impact of an electron-ion collider

2019

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We present a first determination of the nuclear parton distribution functions (nPDF) based on the NNPDF methodology: nNNPDF1.0. This analysis is based on neutral-current deepinelastic structure function data and is performed up to NNLO in QCD calculations with heavy quark mass effects. For the first time in the NNPDF fits, the χ 2 minimization is achieved using stochastic gradient descent with reverse-mode automatic differentiation (backpropagation). We validate the robustness of the fitting methodology through closure tests, assess the perturbative stability of the resulting nPDFs, and compare them with other recent analyses. The nNNPDF1.0 distributions satisfy the boundary condition whereby the NNPDF3.1 proton PDF central values and uncertainties are reproduced at A = 1, which introduces important constraints particularly for low-A nuclei. We also investigate the information that would be provided by an Electron-Ion Collider (EIC), finding that EIC measurements would significantly constrain the nPDFs down to x 5 × 10 −4 . Our results represent the first-ever nPDF determination obtained using a Monte Carlo methodology consistent with that of state-of-the-art proton PDF fits, and provide the foundation for a subsequent global nPDF analyses including also proton-nucleus data.

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Section: Nuclear Pdfs At the Electron-ion Collidermentioning

confidence: 99%

Nuclear parton distributions from lepton-nucleus scattering and the impact of an electron-ion collider

2019

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“…Plugging this expression for the amplitude (and its complex conjugate) back into Eq. (22), we obtain the LO triple differential inclusive cross-section for the production of a prompt photon in association with a dijet as [44]…”

Section: General Definitions and Brief Review Of Lo Computationmentioning

confidence: 99%

“…However large final state interactions may be present in these experiments that will complicate interpretations of the data [19]. These considerations provide a major motivation for future Electron-Ion Collider (EIC) experiments [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

NLO impact factor for inclusive photon+dijet production in e+A DIS at small x

Roy

Venugopalan

2020

Phys. Rev. D

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We compute the next-to-leading order (NLO) impact factor for inclusive photon +dijet production in electron-nucleus (e+A) deeply inelastic scattering (DIS) at small x. An important ingredient in our computation is the simple structure of "shock wave" fermion and gluon propagators. This allows one to employ standard momentum space Feynman diagram techniques for higher order computations in the Regge limit of fixed Q 2 Λ 2 QCD and x → 0. Our computations in the Color Glass Condensate (CGC) effective field theory include the resummation of all-twist power corrections Q 2 s /Q 2 , where Qs is the saturation scale in the nucleus. We discuss the structure of ultraviolet, collinear and soft divergences in the CGC, and extract the leading logs in x; the structure of the corresponding rapidity divergences gives a nontrivial first principles derivation of the JIMWLK renormalization group evolution equation for multiparton lightlike Wilson line correlators. Explicit expressions are given for the x-independent O(αs) contributions that constitute the NLO impact factor. These results, combined with extant results on NLO JIMWLK evolution, provide the ingredients to compute the inclusive photon + dijet cross-section at small x to O(α 3 s ln(x)). First results for the NLO impact factor in inclusive dijet production are recovered in the soft photon limit. A byproduct of our computation is the LO photon+ 3 jet (quark-antiquark-gluon) cross-section. CONTENTS * kaushik.roy.1@stonybrook.edu † raju@bnl.gov arXiv:1911.04530v2 [hep-ph] 3 Dec 2019 97 J. Proof of the sub-dominance of non-collinearly divergent contributions in the SCA 100References 100

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“…It is interesting to ask if the color memory effect could be experimentally verified. The observable linked most naturally with the kick (4.5) is the color dipole cross-section [10] and the prospects for its extraction in the future Electron-Ion Collider is discussed in [27]. The detection seems a plausible scenario, albeit in a highly convoluted environment.…”

Section: Simplification In Quantum Theorymentioning

confidence: 99%

Memory effect in Yang-Mills theory

2019

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We study the empirical realisation of the memory effect in Yang-Mills theory, especially in view of the classical vs. quantum nature of the theory. Gauge invariant analysis of memory in classical U(1) electrodynamics and its observation by total change of transverse momentum of a charge is reviewed. Gauge fixing leads to a determination of a gauge transformation at infinity. An example of Yang-Mills memory then is obtained by reinterpreting known results on interactions of a quark and a large high energy nucleus in the theory of Color Glass Condensate. The memory signal is again a kick in transverse momentum, but it is only obtained in quantum theory after fixing the gauge, after summing over an ensemble of classical processes.

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The Electron-Ion Collider: Assessing the Energy Dependence of Key Measurements

Cited by 17 publications

References 127 publications

Nuclear parton distributions from lepton-nucleus scattering and the impact of an electron-ion collider

Nuclear parton distributions from lepton-nucleus scattering and the impact of an electron-ion collider

NLO impact factor for inclusive photon+dijet production in e+A DIS at small x

Memory effect in Yang-Mills theory

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