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Abelev, B.; Adam, J.; Adamová, D.; Adare, A.; Aggarwal, M. M.; Rinella, G. Aglieri; Agnello, M.; Agocs, A. G.; Agostinelli, A.; Salazar, S. Aguilar; Ahammed, Z.; Masoodi, A. Ahmad; Ahmad, N.; Ahn, S. U.; Ahn, S. U.; Akindinov, A.; Aleksandrov, D.; Alessandro, B.; Molina, R. Alfaro; Alici, A.; Alkin, A.; Aviña, E. Almaráz; Alme, J.; Alt, T.; Altini, V.; Altinpinar, S.; Altsybeev, I.; Andrei, C.; Andronic, A.; Anguelov, V.; Anielski, J.; Anson, C.; Antičić, T.; Antinori, F.; Antonioli, P.; Aphecetche, L.; Appelshäuser, H.; Arbor, N.; Arcelli, S.; Arend, A.; Armesto, N.; Arnaldi, R.; Aronsson, T.; Arsene, I. C.; Arslandok, M.; Asryan, A.; Augustinus, A.; Averbeck, R.; Awes, T. C.; Äystö, J.; Azmi, M. D.; Bach, M.; Badalà, A.; Baek, Yongwook; Bailhache, R.; Bala, R.; Ferroli, R. Baldini; Baldisseri, A.; Pedrosa, F. Baltasar Dos Santos; Bán, J.; Baral, R. C.; Barbera, R.; Barile, F.; Barnaföldi, G. 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doi:10.1016/j.physletb.2012.11.059

Cited by 208 publications

(152 citation statements)

References 26 publications

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“…The dot-dashed curve represents the 02005-p.4 result using R G = 1. It overestimates the ALICE data [11,12] on the backward (forward) and mainly in central rapidities. The situation is improved if we consider nuclear shadowing renormalising the dipole cross section.…”

Section: Numerical Results and Data Comparisonmentioning

confidence: 68%

“…Here some comments are in order. It was recently shown [13] that the color dipole approach with R G = 1 is not able to describe the ALICE data for coherent production of J/ψ at 2.76 GeV [11,12] at midrapidity even including the theoretical uncertainties related to the meson wavefunction and models for the dipole cross section (and distinct choices for the charm quark mass). The midrapidity cross section is overestimated by a factor two in the case presented here.…”

Section: Numerical Results and Data Comparisonmentioning

confidence: 99%

See 1 more Smart Citation

Quarkonium photoproduction inppandAAcollisions at the LHC

Griep

Machado

2016

EPJ Web of Conferences

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Abstract. In this contribution we report on the investigations of the exclusive production of quarkonium states in proton-proton and nucleus-nucleus reactions at the LHC using the theoretical framework of the light-cone dipole formalism. In particular, we discuss the rapidity distribution for J/ψ, ψ(2S ) and Υ(1S ) states and the transverse momentum distribution for the J/ψ meson. The numerical calculations are compared to recent experimental results and prediction are done for future LHC runs in the ultraperipheral channel.

show abstract

Section: Numerical Results and Data Comparisonmentioning

confidence: 68%

Section: Numerical Results and Data Comparisonmentioning

confidence: 99%

Quarkonium photoproduction inppandAAcollisions at the LHC

Griep

Machado

2016

EPJ Web of Conferences

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“…Both, the cross sections of coherent and of incoherent photoproduction of J/ψ have been measured [13,14]. The coherent J/ψ cross section is found to be in good agreement with a model that incorporates nuclear gluon shadowing according to the EPS09 parameterization (AB-EPS09).…”

Section: Discussionmentioning

confidence: 77%

Charmonium photoproduction in ultra-peripheral p-Pb and Pb-Pb collisions with ALICE at the LHC

Gruttola

2015

EPJ Web of Conferences

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Abstract. The photoproduction of vector mesons in Ultra-Peripheral Collisions (UPC) is a powerful tool to probe the nuclear gluon distribution (Pb-Pb collisions) and the gluon structure function in the proton (p-Pb collisions). The first measurements of coherent photoproduced J/ψ and ψ(2S) in Pb-Pb collisions at √ s NN = 2.76 TeV, performed with the ALICE detector, are described and compared to STARLIGHT and QCD based models, in order to investigate nuclear gluon shadowing. The results of the measurement of exclusive J/ψ photoproduction off protons in p-Pb collisions at √ s NN = 5.02 TeV are also presented. Ultra-peripheral collisionsUltra-peripheral collisions may occur when two accelerated nuclei are separated by impact parameters larger than the sum of their radii: hadronic interactions are strongly suppressed so that both pure electromagnetic and photonuclear processes can be studied. These interactions can be measured in Pb-Pb collisions at the LHC, where the available centre of mass energy per nucleon pair is 2.76 TeV, allowing γγ interactions at ≈80 GeV and γp at ≈480 GeV center of mass energy, to be compared with 10 and 30 GeV respectively, reached at RHIC. An accelerated charge can be considered as a source of quasi-real photons with virtuality Q 2 depending on the radius of the Pb nucleus and being ∼30 MeV 2 , according to Fermi [1] and to relativistic approach by Weizsäcker [2] and Williams [3]. One of these quasi-real photons may interact either with the opposite ion or with one of its quasi-real photons. The cross section for photon induced reactions is large because the strong electromagnetic field of the nucleus enhances the intensity of the virtual photon flux, which grows as Z 2 , where Z is the charge of the nucleus. UPCs are characterized by the photoproduction of vector mesons (ρ 0 , J/ψ, ψ', Υ,...) and by pure QED processes giving rise to a di-lepton continuum. The physics of ultra-peripheral collisions is reviewed in [4,5]. Physics motivationsExclusive photoproduction of vector mesons, where a vector meson is produced in an event with no other final state particles, is of particular interest. In Pb-Pb collisions these measurements probe nuclear gluon shadowing in the low Bjorken-x region, where it is poorly known. On the other a e-mail: daniele.de.gruttola@cern.ch hand, p-Pb collisions allow the study of the evolution with energy of the gluon distribution in the proton, and provide a powerful tool to investigate gluon saturation. ALICE can extend the measurement done at HERA [6,7] and ZEUS [8] to higher γp center of mass energy. Pb-Pb collisionsExclusive photoproduction of vector mesons is expected to probe the nuclear gluon distribution [9], for which there is considerable uncertainty in the low-x region, as it can be seen in Fig.1, showing the ratio of their parton distribution functions for bounded and free protons [10,11]. Exclusive photoproduction can be either coherent, if the photon couples coherently to all nucleons, or incoherent, if the photon couples to a single nucleon. Coheren...

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“…The sensitivity of the different modern PDFs to the medium corrections is clearly visible in the rapidity spectrum of J/Ψ and Υ particles produced via this process [379][380][381]. The power of experiments to discern among the several PDFs [379] those that best reproduce the experimental data has been evidenced in experiments at the LHC/CERN [123,382,383]. This allows for a better discrimination of the pre-initial PDF conditions for interest in the formation of the QGP in URHICs.…”

Section: Hadrons Quark Soups and Strong E/m Fieldsmentioning

confidence: 99%

Current Status of Nuclear Physics Research

Bertulani

Hussein

2015

Braz J Phys

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In this review we discuss the current status of research in nuclear physics which is being carried out in different centers in the World. For this purpose we supply a short account of the development in the area which evolved over the last 9 decades, since the discovery of the neutron. The evolution of the physics of the atomic nucleus went through many stages as more data become available. We briefly discuss models introduced to discern the physics behind the experimental discoveries, such as the shell model, the collective model, the statistical model, the interacting boson model, etc., some of these models may be seemingly in conflict with each other, but this was shown to be only apparent.The richness of the ideas and abundance of theoretical models attests to the important fact that the nucleus is a really singular system in the sense that it evolves from two-body bound states such as the deuteron, to few-body bound states, such as 4 He, 7 Li, 9 Be etc. and up the ladder to heavier bound nuclei containing up to more than 200 nucleons. Clearly statistical mechanics, usually employed in systems with very large number of particles, would seemingly not work for such finite systems as the nuclei, neither do other theories which are applicable to condensed matter. The richness of nuclear physics stems from these restrictions. New theories and models are presently being developed. Theories of the structure and reactions of neutron-rich and proton-rich nuclei, called exotic nuclei, halo nuclei, or Borromean nuclei, deal with the wealth of experimental data that became available in the last 35 years. Further, nuclear astrophysics and stellar and Big Bang nucleosynthesis have become a more mature subject. Due to limited space, this review only covers a few selected topics, mainly those with which the authors have worked on. Our aimed potential readers of this review are nuclear physicists and physicists in other areas, as well as graduate students interested in pursuing a career in nuclear physics.

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Coherent J/ψ photoproduction in ultra-peripheral Pb–Pb collisions at sNN=

Cited by 208 publications

References 26 publications

Quarkonium photoproduction inppandAAcollisions at the LHC

Quarkonium photoproduction inppandAAcollisions at the LHC

Charmonium photoproduction in ultra-peripheral p-Pb and Pb-Pb collisions with ALICE at the LHC

Current Status of Nuclear Physics Research

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