Mapping the Electromagnetic Fields of Heavy-Ion Collisions with the Breit-Wheeler Process

Brandenburg, James Daniel; Zha, Wangmei; Xu, Zhangbu

doi:10.48550/arxiv.2103.16623

Cited by 6 publications

(6 citation statements)

References 78 publications

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“…with 5, we see that the Wigner function approach agrees very well with data, while the naive photoproduction peak at slightly lower 𝑃 𝑇 than data. With increasing cm-energy (right 1An approach to dilepton production based on Wigner functions has recently been proposed in [30], for a recent review with more references, see [31] PoS(XVHadronPhysics)020…”

Section: Wolfgang Schäfermentioning

confidence: 99%

Photon induced processes from semi-central to ultraperipheral heavy-ion collisions

Schäfer¹

2022

Proceedings of XV International Workshop on Hadron Physics — PoS(XVHadronPhysics)

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Ultrarelativistic heavy ions are accompanied by a large flux of quasi-real Weizsäcker-Williams photons. This opens a broad range of research possibilities, as the Weizsäcker-Williams photons can be used to study photon-photon fusion reactions as well as photonuclear reactions in a wide range of energies. Of special interest here are diffractive photoproduction reactions, which appear in two major classes: the coherent diffraction in which the target nucleus stays intact and the incoherent (or quasielastic) diffraction in which the nucleus breaks up, but no additional particles are produced in the nuclear fragmentation region. We will discuss the coherent diffractive photoproduction of heavy vector mesons 𝐽/𝜓. Good agreement with available experimental data by the ALICE and LHCb collaborations can be obtained within a color-dipole approach. Here additional nuclear shadowing from the 𝑐 c𝑔-Fock state is needed to obtain agreement with data. Very recently, the role of Weizsäcker-Williams photons in peripheral, inelastic, heavy ion collisions has come under scrutiny. Recent measurements of dilepton production of the STAR collaboration in √ 𝑠 𝑁 𝑁 =200 GeV Au-Au collisions indicate an excess at small pair 𝑝 𝑇 most notably in peripheral collisions. We show, that it can be that has attributed to the initial photon fusion which is most significant at small pair transverse momenta. The centrality dependence of the pair transverse momentum distribution is calculated in a novel factorization approach involving Wigner distributions of photons.

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Section: Wolfgang Schäfermentioning

confidence: 99%

Photon induced processes from semi-central to ultraperipheral heavy-ion collisions

Schäfer¹

2022

Proceedings of XV International Workshop on Hadron Physics — PoS(XVHadronPhysics)

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“…Refs. [49,50]), which affect the p T distributions of the decay products. Both aspects deserve a more detailed analysis which we intend to perform in the near future.…”

Section: Photoproduction Of Qed Bound Statesmentioning

confidence: 99%

Photoproduction of relativistic QED bound states in hadronic collisions

Francener,

Goncalves,

Moreira

2021

Preprint

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In this paper we investigate the photoproduction of QED bound states in proton -proton, proton -nucleus and nucleus -nucleus collisions at RHIC, LHC and FCC energies considering an accurate treatment of the absorptive corrections and for the nuclear form factor. The total cross sections for the production of singlet and triplet (l + l − ) states, with l = e, µ, τ , are estimated and a detailed analysis of the photoproduction of singlet QED bound states is performed considering the rapidity ranges covered by central and forward detectors. The impact of the Coulomb corrections on the parapositronium production in heavy ion collisions is estimated. We predict a large number of events associated to the production of (e + e − ) and (µ + µ − ) states in hadronic collisions.

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“…[64]. All in all, the linear polarization of coherent photons has been proven to be a powerful experimental tool for exploring novel QCD phenomenology as well as novel aspects of QED under extreme conditions [65][66][67][68][69][70].…”

Section: Introductionmentioning

confidence: 99%

Exploring gluon tomography with polarization dependent diffractive J/$ψ$ production

Brandenburg¹,

Xu²,

Zha³

et al. 2022

Preprint

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We study azimuthal asymmetries in diffractive J/ψ production in ultraperipheral heavy-ion collisions at RHIC and LHC energies using the color glass condensate effective theory. Our calculation successfully describes azimuthal averaged J/ψ production cross section measured by STAR and ALICE. We further predict very large cos 2φ and cos 4φ azimuthal asymmetries for diffractive J/ψ production both in UPCs at RHIC and LHC energies and in eA collisions at EIC energy. These novel polarization dependent observables may provide complementary information for constraining gluon transverse spatial distribution inside large nuclei. As compared to all previous analysis of diffractive J/ψ production, the essential new elements integrated in our theoretical calculations are: the double-slit interference effect, the linear polarization of coherent photons, and the final state soft photon radiation effect.

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Mapping the Electromagnetic Fields of Heavy-Ion Collisions with the Breit-Wheeler Process

Cited by 6 publications

References 78 publications

Photon induced processes from semi-central to ultraperipheral heavy-ion collisions

Photon induced processes from semi-central to ultraperipheral heavy-ion collisions

Photoproduction of relativistic QED bound states in hadronic collisions

Exploring gluon tomography with polarization dependent diffractive J/$ψ$ production

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