Evidence for<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>x</mml:mi></mml:math>-dependent proton color fluctuations in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>p</mml:mi><mml:mi>A</mml:mi></mml:mrow></mml:math>collisions at the CERN Large Hadron Collider

Alvioli, Massimiliano; Cole, B.; Frankfurt, L.; Perepelitsa, D. V.; Strikman, M.

doi:10.1103/physrevc.93.011902

Cited by 45 publications

(42 citation statements)

References 25 publications

(39 reference statements)

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“…The first case is when our factorization ansatz Eq. (15) is violated by, for instance, the existence of strong correlations [133]. The concrete formulas (18) and (22) for DPS cross sections should be revised depending on the new ansatz.…”

Section: Dps In Nucleus-nucleus Collisionsmentioning

confidence: 99%

Probing impact-parameter dependent nuclear parton densities from double parton scatterings in heavy-ion collisions

Shao

2020

Phys. Rev. D

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We propose a new method to determine the spatially or impact-parameter dependent nuclear parton distribution functions (nPDFs) using the double parton scattering (DPS) processes in highenergy heavy-ion (proton-nucleus and nucleus-nucleus) collisions. We derive a simple generic DPS formula in nuclear collisions by accommodating both the nuclear collision geometry and the spatially dependent nuclear modification effect, under the assumption that the impact-parameter dependence of nPDFs is only related to the nuclear thickness function. While the geometric effect is widely adopted, the impact of the spatially dependent nuclear modification on DPS cross sections has been overlooked so far, which can, however, be significant when the initial nuclear modification is large. In turn, the DPS cross sections in heavy-ion collisions can provide useful information on the spatial dependence of nPDFs. They can be, in general, obtained in minimum-bias nuclear collisions, featuring the virtue of independence of Glauber modeling.1 To the best of our knowledge, none of the existing DPS phenomenological applications in heavy-ion collisions [89][90][91][92][96][97][98][99][100][101][102][103][104] considers such an effect. 2 There are also a few attempts to obtain the spatial form of the nPDFs based on phenomenological models (see, e.g., ).

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Section: Dps In Nucleus-nucleus Collisionsmentioning

confidence: 99%

Probing impact-parameter dependent nuclear parton densities from double parton scatterings in heavy-ion collisions

Shao

2020

Phys. Rev. D

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“…At the same time, however, the minimum-bias versions of the same jet observables -obtained by "integrating out" the variable used for the centrality classification -are in good agreement [15,16,19] with the predictions based on collinearly factorized Quantum Chromo-Dynamics (QCD). This appears to indicate that the current experimental methods to realize the centrality classification seriously interfere [20,21] with the hard processes and, among other proposals [22][23][24][25], it has been argued [26] that even the standard energy-momentum conservation plays a significant role. On top of this, the presence of event-by-event fluctuations in the initial profile of nucleons inside nucleus can further distort the multiplicitybased experimental centrality classification.…”

Section: Introductionmentioning

confidence: 98%

Neutron skin and centrality classification in high-energy heavy-ion collisions at the LHC

Paukkunen

2015

Physics Letters B

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The concept of centrality in high-energy nuclear collisions has recently become a subject of an active debate. In particular, the experimental methods to determine the centrality that have given reasonable results for many observables in high-energy lead-lead collisions at the LHC have led to surprising behavior in the case of proton-lead collisions. In this letter, we discuss the possibility to calibrate the experimental determination of centrality by asymmetries caused by mutually different spatial distributions of protons and neutrons inside the nuclei -a well-known phenomenon in nuclear physics known as the neutron-skin effect.

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“…Some experimental studies on different aspects of heavy-ion collisions are presented in Refs [101][102][103][104][105][106][107][108][109][110][111][112][113][114]. W and Z boson production in proton-nucleus (p-A) and nucleus-nucleus (A-A) collisions at the CERN-LHC offer a unique opportunity to probe nuclear PDFs.…”

Section: Nuclear Pdfs At the Lhc Eramentioning

confidence: 99%

Global analysis of nuclear parton distribution functions and their uncertainties at next-to-next-to-leading order

Khanpour

Tehrani²

2016

Phys. Rev. D

113

130

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We perform a next-to-next-to-leading order (NNLO) analysis of nuclear parton distribution functions (nPDFs) using neutral current charged-lepton (ℓ ± + nucleus) deeply inelastic scattering (DIS) data and Drell-Yan (DY) cross-section ratios σ A DY /σ A ′ DY for several nuclear targets. We study in detail the parametrizations and the atomic mass (A) dependence of the nuclear PDFs at this order. The present nuclear PDFs global analysis provides us a complete set of nuclear PDFs, f2 ), with a full functional dependence on x, A, Q 2 . The uncertainties of the obtained nuclear modification factors for each parton flavour are estimated using the well-known Hessian method. The nuclear charm quark distributions are also added into the analysis. We compare the parametrization results with the available data and the results of other nuclear PDFs groups. We found our nuclear PDFs to be in reasonably good agreement with them. The estimates of errors provided by our global analysis are rather smaller than those of other groups. In general, a very good agreement is achieved. We also briefly review the recent heavy-ion collisions data including the first experimental data from the LHC proton+lead and lead+lead run which can be used in the global fits of nuclear PDFs. We highlight different aspects of the high luminosity Pb-Pb and p-Pb data which have been recorded by the CMS Collaboration.

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Evidence forx-dependent proton color fluctuations inpAcollisions at the CERN Large Hadron Collider

Cited by 45 publications

References 25 publications

Probing impact-parameter dependent nuclear parton densities from double parton scatterings in heavy-ion collisions

Probing impact-parameter dependent nuclear parton densities from double parton scatterings in heavy-ion collisions

Neutron skin and centrality classification in high-energy heavy-ion collisions at the LHC

Global analysis of nuclear parton distribution functions and their uncertainties at next-to-next-to-leading order

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