Studying Coulomb correction at EIC and EicC

Sun, Ze-hao; Zheng, Du-xin; Zhou, Jian; Zhou, Ya-jin

doi:10.1016/j.physletb.2020.135679

Cited by 15 publications

(10 citation statements)

References 30 publications

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“…( 20) are in a good agreement with the data in the low transverse momentum region, while they give a little larger values than the data for transverse momenta larger than 0.02 GeV. The difference may come from possible higher order corrections [79,107].…”

Section: Numerical Resultssupporting

confidence: 74%

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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Section: Numerical Resultssupporting

confidence: 74%

Lepton pair production in ultra-peripheral collisions

Wang,

Pu,

Wang

2021

Preprint

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“…This led to the absence of higher correction to total cross section for vacuum pair production. With the same regularization, the study of [21,22] indicated that the higher-order effect could only be observed in the differential cross section as a function of impact parameter. This is in obvious contradiction to the special case of the Bethe-Maximon correction to the Bethe-Heitler formula.…”

Section: Jhep08(2021)083mentioning

confidence: 99%

Discovery of higher-order quantum electrodynamics effect for the vacuum pair production

Zha

Tang

2021

J. High Energ. Phys.

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The higher-order quantum electrodynamics (QED) effect for vacuum pair production has been searched without success since 1954. In this paper, we show that the combined world-wide data of lepton pair vacuum production is about 20% smaller than the latest lowest order QED calculation with a 5.2 sigma-level of significance and is consistent with the corresponding higher-order QED result. We claim the discovery of higher-order effect for the QED pair production, which settles the dust of previous debates for several decades. The verification of higher-order QED effect is a fundamental scientific problem, which is an important milestone towards the nonperturbative and nonlinear regime of QED vacuum.

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“…These relations remain true under small-x evolution. In the QED case, the same relation between the unpolarized photon TMD and the linearly polarized photon TMD holds in the small-x limit [56][57][58]. The linear polarization of photons can be probed via a cos 4φ azimuthal asymmetry in di-lepton production [59].…”

Section: Evolved T-odd Gluon Tmdsmentioning

confidence: 88%

Energy evolution of T-odd gluon TMDs at small $x$

Boer,

Hagiwara,

Zhou

et al. 2022

Preprint

Self Cite

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We study the energy or TMD evolution of the three leading twist dipole type T-odd gluon TMDs inside a transversely polarized nucleon, all of which at small x dynamically originate from the spin dependent odderon. Their energy dependence presents a unique opportunity to study the polarization dependent TMD evolution in the small-x region, where the distributions are identical up to a normalization constant at tree level. We further propose to study their evolution via azimuthal asymmetries in virtual photon-jet production in polarized proton-proton collisions at RHIC. We present model predictions for the asymmetries as functions of the large jet or photon transverse momentum and Q 2 which set the hard scales in this process.

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Studying Coulomb correction at EIC and EicC

Cited by 15 publications

References 30 publications

Lepton pair production in ultra-peripheral collisions

Lepton pair production in ultra-peripheral collisions

Discovery of higher-order quantum electrodynamics effect for the vacuum pair production

Energy evolution of T-odd gluon TMDs at small $x$

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