Interplay of Reggeon and photon in 
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 collisions

Başar, Gökçe; Kharzeev, Dmitri E.; Yee, Ho‐Ung; Zahed, Ismaïl

doi:10.1103/physrevd.95.126005

Cited by 5 publications

(4 citation statements)

References 34 publications

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“…The magnitude of the chiral magnetic current J = a C M E B depends on the value of the coefficient a C M E , which, if electromagnetic fields are treated in the linear approximation, mainly depends on the chiral imbalance in the system. This is, in turn, to a great extent determined by the sphaleron decay rate, that was computed at weak coupling [160,160,161], and in strongly coupled conformal N = 4 super Yang-Mills plasma without, and with magnetic fields [41,162] using holography. The calculation was carried out in improved holographic models again without and with magnetic fields [63,163] where it was shown that the decay rate goes up significantly both as a result of non-conformality and of magnetic fields.…”

Section: Discussionmentioning

confidence: 99%

Holographic QCD and magnetic fields

Gürsoy

2021

Eur. Phys. J. A

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We review the holographic approach to electromagnetic phenomena in large N QCD. After a brief discussion of earlier holographic models, we concentrate on the improved holographic QCD model extended to involve magnetically induced phenomena. We explore the influence of magnetic fields on the QCD ground state, focusing on (inverse) magnetic catalysis of chiral condensate, investigate the phase diagram of the theory as a function of magnetic field, temperature and quark chemical potential, and, finally discuss effects of magnetic fields on the quark–anti-quark potential, shear viscosity, speed of sound and magnetization.

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Section: Discussionmentioning

confidence: 99%

Holographic QCD and magnetic fields

Gürsoy

2021

Eur. Phys. J. A

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“…In the following decade, in part inspired by the availability of new data from the SPS, the calculations were extended to include Bremsstrahlung in the plasma [54], the effect of soft gluons [55], and the Landau-Pomeranchuk-Migdal (LPM) effect [56]. A comprehensive set of rates contributing in leading order to photon emission from the QGP were given in [57]; those 'AMY rates' are often used even today in hydro codes (see for instance [58,59]). It should be noted, however, that the AMY rates (and most other explicit calculations) assume a weakly coupled ultrarelativistic plasma [57], calculating photon emission one by one for various leading order processes (diagrammatic approach).…”

Section: Radiation From the Qgpmentioning

confidence: 99%

Direct real photons in relativistic heavy ion collisions

David

2020

Rep. Prog. Phys.

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Direct real photons are arguably the most versatile tools to study relativistic heavy ion collisions. They are produced, by various mechanisms, during the entire space-time history of the strongly interacting system. Also, being colorless, most the time they escape without further interaction, i.e. they are penetrating probes. This makes them rich in information, but hard to decypher and interpret. This review presents the experimental and theoretical developments related to direct real photons since the 1970s, with a special emphasis on the recently emerged "direct photon puzzle", the simultaneous presence of large yields and strong azimuthal asymmetries of photons in heavy ion collisions, an observation that so far eluded full and coherent explanation. CONTENTS arXiv:1907.08893v1 [nucl-ex] 21 Jul 2019 21. Hydrodynamical models 48 2. Initial state, (fast) thermalization 50 3. Transport calculations 50 4. Other ideas 52 VII. Concluding remarks 54 VIII. Acknowledgements 55 References 56 3 I. INTRODUCTIONThe centuries old quest to reveal the "ultimate" constituents of matter and the laws of Nature governing them, and the realization from quantum mechanics that mapping smaller and smaller objects requires ever larger energy probes, made high energy physics one of the dominant scientific disciplines of the XXth century. At first we took advantage of the Universe as an "accelerator" providing high energy probes (cloud chamber and emulsion experiments), but soon we started to build our own accelerators, constantly increasing their energy and luminosity. The most spectacular and best known results came in elementary particle physics, but astrophysics and nuclear physics were a close second, benefiting enormously from the progress in experimental and theoretical tools. The central question in particle physics was the substructure of hadrons and the nature of confinement, while high energy nuclear physics' foremost concern was the behavior of high density nuclear matter, including its collectivity and possible phase transition into partonic matter, which in turn evoked the early stages of the Universe. Albeit particle and nuclear physics came with different perspectives, both were concerned with the strong interaction and its underlying theory, quantum chromodynamics (QCD), so the birth of a new discipline at their intersection, relativistic heavy ion physics, was almost inevitable. From Princeton and Berkeley to Dubna the race for larger and larger ions, energies and luminosities was on. Hadrons and nuclear fragments were studied extensively, and the applicability of thermo-and hydrodynamics gradually recognized. An excellent review of these first facilities and early developments -both experimental and theoretical -can be found in [1] by Goldhaber, while a (literally) insightful account of the genesis and achievements of RHIC and LHC was given by Baym in [2].Although lepton and photon production in hadronic and nuclear collisions was studied almost since the birth of quantum mechanics and quantum electrodynamics [3][4][...

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“…See Ref. 4 for application of holography in proton-nucleus collisions. We model a dilute nucleus in a bottom-up and top-down approaches.…”

Section: Introductionmentioning

confidence: 99%

Holographic Approaches to DIS on a Nucleus

Mamo

2020

Probing Nucleons and Nuclei in High Energy Collisions

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We consider deep inelastic scattering (DIS) on a dense nucleus described as an extremal RN-AdS black hole with holographic quantum fermions in the bulk. We find that the R-ratio (the ratio of the structure function of the black hole to proton) exhibit shadowing for x < 0.1, anti-shadowing for 0.1 < x < 0.3, EMC-like effect for 0.3 < x < 0.8 and Fermi motion for x > 0.8 in a qualitative agreement with the experimental observation of the ratio for DIS on nucleus for all range of x. We also take the dilute limit of the black hole and show that its R-ratio exhibits EMC-like effect for 0.2 < x < 0.8 and the Fermi motion for x > 0.8, and no shadowing is observed in the dilute limit for both bottom-up (using Thomas-Fermi approximation for the nucleon distribution inside the dilute nucleus), and top-down (considering the dilute nucleus to be a Fermi gas in AdS) approaches.

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Interplay of Reggeon and photon in pA collisions

Cited by 5 publications

References 34 publications

Holographic QCD and magnetic fields

Holographic QCD and magnetic fields

Direct real photons in relativistic heavy ion collisions

Holographic Approaches to DIS on a Nucleus

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