Initial transverse-momentum broadening of Breit-Wheeler process in relativistic heavy-ion collisions

Zha, W.; Brandenburg, J. D.; Tang, Z.; Xu, Z.

doi:10.1016/j.physletb.2019.135089

Cited by 76 publications

(84 citation statements)

References 39 publications

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“…The model by Kłusek-Gawenda et al uses EPA and Woods-Saxon nuclear form factors [1,20]. Zhangbu et al provide calculations using a generalized EPA (gEPA) approach which results in an impact parameter dependent p T,ee shape of the spectra [21,22]. In addition, Zhangbu et al carried out a full leading order QED calculation [22].…”

Section: Data Analysis and Resultsmentioning

confidence: 99%

“…Apart from including resolution effects in the model calculations, an extension of the analysis in terms of mass and centrality range is foreseen, which should allow for more differential studies. These may address the geometry of the initial electromagnetic field and its fluctuations, effects of the strong magnetic field, and interactions with the medium [9,21,23,24]. Data recorded in 2018 are currently becoming available and will approximately double the data set size in peripheral collision, which will further benefit these analyses.…”

Section: Discussionmentioning

confidence: 99%

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Dielectron production at low transverse momentum in Pb-Pb collisions at $ \sqrt{s_{\mathrm{NN}}}=5.02 $ TeV with ALICE

Lehner¹

2019

Proceedings of 7th Annual Conference on Large Hadron Collider Physics — PoS(LHCP2019)

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Dielectrons probe a wide range of phenomena in heavy-ion collisions. These include lightand heavy-flavour meson production, thermal radiation and coherent photo-production. The latter process is distinguished by dielectron production at low transverse-pair momentum (p T,ee ). Transverse momentum spectra of dielectrons in central and peripheral Pb-Pb collisions are extracted and compared to the corresponding expectations. In central collisions the data fit the expected spectrum, which is dominated by semi-leptonic decays of correlated heavy-flavour hadrons. In peripheral collisions, the data exhibit an excess at low p T,ee with respect to hadronic and thermal sources. The observed excess yield is compatible with calculations for dielectron production from coherent photon-photon interactions.

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Section: Data Analysis and Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Dielectron production at low transverse momentum in Pb-Pb collisions at $ \sqrt{s_{\mathrm{NN}}}=5.02 $ TeV with ALICE

Lehner¹

2019

Proceedings of 7th Annual Conference on Large Hadron Collider Physics — PoS(LHCP2019)

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“…There are hints that the muons undergo electromagnetic interactions with the dense QCD medium, seen by p T broadening of dimuon spectra [5]. However, this broadening can also be described by photo-production [6]. Regardless of the physical origin, the scale of these p T -modifications is negligible compared to the average momentum of the muons, which is about half of the Z-boson mass.…”

Section: Introductionmentioning

confidence: 99%

Z-boson production in p-Pb collisions at $$ \sqrt{s_{\mathrm{NN}}} $$ = 8.16 TeV and Pb-Pb collisions at $$ \sqrt{s_{\mathrm{NN}}} $$ = 5.02 TeV

Acharya

Adamová

Adler

et al. 2020

J. High Energ. Phys.

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Measurement of Z-boson production in p-Pb collisions at $$ \sqrt{s_{\mathrm{NN}}} $$ s NN = 8.16 TeV and Pb-Pb collisions at $$ \sqrt{s_{\mathrm{NN}}} $$ s NN = 5.02 TeV is reported. It is performed in the dimuon decay channel, through the detection of muons with pseudorapidity −4 < ημ< −2.5 and transverse momentum $$ {p}_{\mathrm{T}}^{\mu } $$ p T μ > 20 GeV/c in the laboratory frame. The invariant yield and nuclear modification factor are measured for opposite-sign dimuons with invariant mass 60 < mμμ< 120 GeV/c2 and rapidity 2.5 <$$ {y}_{\mathrm{cms}}^{\mu \mu} $$ y cms μμ < 4. They are presented as a function of rapidity and, for the Pb-Pb collisions, of centrality as well. The results are compared with theoretical calculations, both with and without nuclear modifications to the Parton Distribution Functions (PDFs). In p-Pb collisions the center-of-mass frame is boosted with respect to the laboratory frame, and the measurements cover the backward (−4.46 <$$ {y}_{\mathrm{cms}}^{\mu \mu} $$ y cms μμ < −2.96) and forward (2.03 <$$ {y}_{\mathrm{cms}}^{\mu \mu} $$ y cms μμ < 3.53) rapidity regions. For the p-Pb collisions, the results are consistent within experimental and theoretical uncertainties with calculations that include both free-nucleon and nuclear-modified PDFs. For the Pb-Pb collisions, a 3.4σ deviation is seen in the integrated yield between the data and calculations based on the free-nucleon PDFs, while good agreement is found once nuclear modifications are considered.

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“…This method has been widely used to compute UPC observables, see for example refs. [59][60][61]. The photon distribution derived in the equivalent photon approximation is given by [46,62] xf…”

Section: Phenomenologymentioning

confidence: 99%

The cos 2ϕ azimuthal asymmetry in ρ0 meson production in ultraperipheral heavy ion collisions

Xing

Zhang

Zhou

et al. 2020

J. High Energ. Phys.

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We present a detailed study of vector meson photoproduction in ultraperipheral heavy ion collisions (UPCs). Using the dipole model, we develop a framework for the joint impact parameter and transverse momentum dependent cross sections. We compute the unpolarized cross section and cos 2ϕ azimuthal angular correlation for ρ0 photoproduction with ϕ defined as the angle between the ρ0’s transverse momentum and its decay product pion meson’s transverse momentum. Our result on unpolarized coherent differential cross section gives excellent description to the STAR experimental data. A first compari- son between theoretical calculation and experimental measurement on the cos 2ϕ azimuthal asymmetry, which results from the linearly polarized photons, is performed and reasonable agreement is reached. We find out the characteristic diffractive patterns at both RHIC and LHC energies and predict the impact parameter dependent cos 2ϕ azimuthal asymmetries for ρ0 photoproduction by considering UPCs and peripheral collisions. The future experimental measurements at RHIC and LHC relevant to our calculations will provide a tool to rigorously investigate the coherent and incoherent production of vector meson in UPCs, as well as to probe the nuclear structure in heavy ion collisions.

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Initial transverse-momentum broadening of Breit-Wheeler process in relativistic heavy-ion collisions

Cited by 76 publications

References 39 publications

Dielectron production at low transverse momentum in Pb-Pb collisions at $ \sqrt{s_{\mathrm{NN}}}=5.02 $ TeV with ALICE

Dielectron production at low transverse momentum in Pb-Pb collisions at $ \sqrt{s_{\mathrm{NN}}}=5.02 $ TeV with ALICE

Z-boson production in p-Pb collisions at $$ \sqrt{s_{\mathrm{NN}}} $$ = 8.16 TeV and Pb-Pb collisions at $$ \sqrt{s_{\mathrm{NN}}} $$ = 5.02 TeV

The cos 2ϕ azimuthal asymmetry in ρ0 meson production in ultraperipheral heavy ion collisions

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