Nuclear PDFs in the beginning of the LHC era

Paukkunen, Hannu

doi:10.1016/j.nuclphysa.2014.04.001

Cited by 30 publications

(25 citation statements)

References 104 publications

(120 reference statements)

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“…While the quark nPDF of lead ions (Pb) is well understood from deep inelastic scattering data [8], the gluon nPDF, which is particularly important for perturbative QCD (pQCD) calculations at the CERN LHC energies, is not well constrained. This is because of the limited amount of experimental data that are sensitive to the nPDFs of gluons at perturbative scales [9,10]. The pion spectra in deuteron-gold collisions at a nucleon-nucleon center-of-mass energy √ s NN = 200 GeV [11,12] are the only relativistic heavy ion collision data from the BNL RHIC used in the global fits of nPDFs.…”

mentioning

confidence: 99%

Constraining Gluon Distributions in Nuclei Using Dijets in Proton-Proton and Proton-Lead Collisions at sNN=5.02 TeV

Sirunyan¹,

Tumasyan²,

Adam³

et al. 2018

Phys. Rev. Lett.

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The pseudorapidity distributions of dijets as functions of their average transverse momentum (p_{T}^{ave}) are measured in proton-lead (pPb) and proton-proton (pp) collisions. The data samples were collected by the CMS experiment at the CERN LHC, at a nucleon-nucleon center-of-mass energy of 5.02 TeV. A significant modification of the pPb spectra with respect to the pp spectra is observed in all p_{T}^{ave} intervals investigated. The ratios of the pPb and pp distributions are compared to next-to-leading order perturbative quantum chromodynamics calculations with unbound nucleon and nuclear parton distribution functions (PDFs). These results give the first evidence that the gluon PDF at large Bjorken x in lead ions is strongly suppressed with respect to the PDF in unbound nucleons.

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mentioning

confidence: 99%

Constraining Gluon Distributions in Nuclei Using Dijets in Proton-Proton and Proton-Lead Collisions at sNN=5.02 TeV

Sirunyan¹,

Tumasyan²,

Adam³

et al. 2018

Phys. Rev. Lett.

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“…An outstanding, and still unresolved, issue in nuclear DIS was highlighted in 2011 by the nCTEQ collaboration, who observed that using nPDFs fitted to lepton-nucleus data it is not possible to reproduce the data in neutrino-nucleus scattering [52], see FIure 7. The EPS group do not observe the same tension between neutral and charged current scattering [53,54], although they do not take into account correlated errors in the NuTeV data. The ensuing debate has not yet been settled.…”

Section: Pos(dis2015)001mentioning

confidence: 97%

“…Current nPDF fits typically have high energy applications in mind [54], and naively treat nuclei as a collection of Z unbound proton and A − Z neutron targets in regard to the treatment of the kinematics, and assume universality of the nuclear parton distributions. However, as the observed "non-scaling" behavior of light nuclei at JLab and the discussion on neutral vs. charged current data highlight, this may not be the case.…”

Section: Pos(dis2015)001mentioning

confidence: 99%

PDFs from protons to nuclei

Accardi¹

2016

Proceedings of XXIII International Workshop on Deep-Inelastic Scattering — PoS(DIS2015)

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I review recent progress in the extraction of unpolarized parton distributions in the proton and in nuclei from a unified point of view that highlights how the interplay between high-energy particle physics and lower energy nuclear physics can be of mutual benefit to either field in areas ranging from the search for physics beyond the standard model at the LHC, to the study of the non perturbative structure of nucleons and teh emergence of nuclei from quark and gluon degrees of freedom, to the interaction of colored probes in a cold nuclear medium.

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“…Similarly, e ± +A DIS scattering experiments at an EIC [54] will extract the nuclear PDFs (nPDFs) [55,56], that are important for a deeper understanding of heavy-ion collisions. So far, the kinematic reach of the available fixed target e ± +A cross-section measurements is much more restricted than for protons, with very little data available for low x ≤ 10 −2 at Q 2 ∼ 10 GeV 2 .…”

Section: Structure Functions In Nucleimentioning

confidence: 99%

The Electron-Ion Collider: Assessing the Energy Dependence of Key Measurements

Aschenauer

Fazio²,

Lee³

et al. 2017

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W. A. Zajc (Columbia). We are grateful to T. Bowman (BNL) for designing the cover for this report and D. Arkhipkin (BNL) and A. Kiselev (BNL) for generating the event display featured on the back cover. AbstractWe provide an assessment of the energy dependence of key measurements within the scope of the machine parameters for a U.S. based Electron-Ion Collider (EIC) outlined in the EIC White Paper. We first examine the importance of the physics underlying these measurements in the context of the outstanding questions in nuclear science. We then demonstrate, through detailed simulations of the measurements, that the likelihood of transformational scientific insights is greatly enhanced by making the energy range and reach of the EIC as large as practically feasible. Summary 36Appendix A Kinematic Variables 40References 41 iii

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Nuclear PDFs in the beginning of the LHC era

Cited by 30 publications

References 104 publications

Constraining Gluon Distributions in Nuclei Using Dijets in Proton-Proton and Proton-Lead Collisions at sNN=5.02 TeV

Constraining Gluon Distributions in Nuclei Using Dijets in Proton-Proton and Proton-Lead Collisions at sNN=5.02 TeV

PDFs from protons to nuclei

The Electron-Ion Collider: Assessing the Energy Dependence of Key Measurements

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