Snowmass 2021 White Paper: Electron Ion Collider for High Energy Physics

Khalek, R. Abdul; D'Alesio, U.; Arratia, M.; Bacchetta, A.; Battaglieri, M.; Begel, M.; Boglione, M.; Boughezal, R.; Boussarie, R.; Bozzi, G.; Chekanov, S. V.; Celiberto, F. G.; Chirilli, G.; Cridge, T.; Cruz-Torres, R.; Corliss, R.; Cotton, C.; Davoudiasl, H.; Deshpande, A.; Dong, X.; Emmert, A.; Fazio, S.; Forte, S.; Furletova, Y.; Gal, C.; Gwenlan, C.; Guzey, V.; Harland-Lang, L. A.; Helenius, I.; Hentschinski, M.; Hobbs, T. J.; Hoeche, S.; Hou, T. -J.; Ji, Y.; Jing, X.; Kelsey, M.; Klasen, M.; Kang, Z. -B.; Kovchegov, Y. V.; Kumar, K. S.; Lappi, T.; Lee, K.; Lee, Y. -J.; Li, H. -T.; Li, X.; Lin, H. -W.; Liu, H.; Liu, Z. L.; Liuti, S.; Lorce, C.; Lunghi, E.; Marcarelli, R.; Magill, S.; Makris, Y.; Mantry, S.; Melnitchouk, W.; Mezrag, C.; Moch, S.; Moutarde, H.; Mukherjee, Swagato; Murgia, F.; Nachman, B.; Nadolsky, P. M.; Nam, J. D.; Neill, D.; Neill, E. T.; Nocera, E.; Nycz, M.; Olness, F.; Petriello, F.; Pitonyak, D.; Platzer, S.; Prestel, S.; Prokudin, A.; Qiu, J.; Radici, M.; Radhakrishnan, S.; Sadofyev, A.; Rojo, J.; Ringer, F.; Salazar, F.; Sato, N.; Schenke, B.; Schlichting, S.; Schweitzer, P.; Sekula, S. J.; Shao, D. Y.; Sherrill, N.; Sichtermann, E.; Signori, A.; Simsek, K.; Simonelli, A.; Sznajder, P.; Tezgin, K.; Thorne, R. S.; Tricoli, A.; Venugopalan, R.; Vladimirov, A.; Vicini, A.; Vitev, I.; Wiegand, D.; Wong, C. -P.; Xie, K.; Zaccheddu, M.; Zhao, Y.; Zhang, J.; Zheng, X.; Zurita, P.

doi:10.48550/arxiv.2203.13199

Cited by 20 publications

(31 citation statements)

References 634 publications

(824 reference statements)

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“…4(right). This supports the statement that high-energy emissions in forward regions of rapidities bring along a high discovery potential and a concrete opportunity to widen our understanding of hadronic structure and, more in general, of strong interactions at new-generation colliders, such as the EIC [117][118][119], HL-LHC [120], the International Linear Collider (ILC) [121], the Forward Physics Facility (FPF) [122,123], and NICA-SPD [124,125].…”

Section: B Toward Precision Studies Of Bfkl Dynamicssupporting

confidence: 70%

“…QCD (with W the hard-scattering center-of-mass energy), is stringently preserved, and the small-x regime, x = Q 2 /W 2 , is accessed. We further present new results for the EIC [117][118][119] at the reference energy of W = 30 GeV (right panel). We make use of the twist-2 (twist-3) distribution amplitudes s for the longitudinal (transverse) configuration, and we gauge the impact of the collinear evolution of the distribution amplitudes describing the exclusive emission of the ρ via a variation of the non-perturbative parameter a 2 (µ 0 = 1 GeV) in the range 0.0 to 0.6 (see Section 2 of Ref.…”

Section: Unintegrated Gluon Distribution (Ugd)mentioning

confidence: 98%

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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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Section: B Toward Precision Studies Of Bfkl Dynamicssupporting

confidence: 70%

Section: Unintegrated Gluon Distribution (Ugd)mentioning

confidence: 98%

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

Hentschinski¹,

Royon²,

Peredo³

et al. 2022

Preprint

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“…In what follows we describe a simple method to calculate γ (2) 21 . The mixing matrix (8) can be written in the following form…”

Section: Simple Examplementioning

confidence: 99%

“…and, since γ 11 = 0, γ (2) 21 = A (1) 21 γ (1) 22 . Thus in order to find γ (2) 21 we need to calculate…”

Section: Simple Examplementioning

confidence: 99%

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NNLO anomalous dimension matrix for twist-two flavor-singlet operators

Braun,

Chetyrkin,

Manashov

2022

Preprint

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Conformal symmetry of QCD is restored at the Wilson-Fisher critical point in noninteger 4 − 2 space-time dimensions. Correlation functions of multiplicatively renormalizable operators with different anomalous dimensions at the critical point vanish identically. We show that this property allows one to calculate off-diagonal parts of the anomalous dimension matrices for leading-twist operators from a set of two-point correlation functions of gauge-invariant operators which can be evaluated using standard computer algebra techniques. As an illustration, we present the results for the NNLO anomalous dimension matrix for flavor-singlet QCD operators for spin N ≤ 8.

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Resummation of threshold logarithms in deeply-virtual Compton scattering

Schoenleber

2023

J. High Energ. Phys.

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I derive an all-order resummation formula for the logarithmically enhanced contributions proportional to $$ \frac{\alpha_s^n}{x\pm \xi } $$ α s n x ± ξ log $$ {\left(\frac{\xi \pm x}{2\xi}\right)}^k $$ ξ ± x 2 ξ k in the quark coefficient function of deeply-virtual-Compton scattering and the pion-photon transition form factor in momentum space. The resummation is performed at the next-to-next-to-leading logarithmic accuracy. The key observation is that the quark coefficient function itself factorizes in the x → ±ξ limit, which allows for a resummation using renormalization group equations. A preliminary numerical analysis suggests that the corrections due to resummation for the quark contribution might be small.

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Snowmass 2021 White Paper: Electron Ion Collider for High Energy Physics

Cited by 20 publications

References 634 publications

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

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

NNLO anomalous dimension matrix for twist-two flavor-singlet operators

Resummation of threshold logarithms in deeply-virtual Compton scattering

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