Will protons become gray at 13 TeV and 100 TeV?

Dremin, I.

doi:10.3103/s1068335617040029

Cited by 7 publications

(7 citation statements)

References 17 publications

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“…3 In case of LHC, the authors use an extrapolated value ρ = 0.14 +0.01 −0.08 from [77] which is compatible with the more recent TOTEM measurement ρ = 0.09/0.10 ± 0.01 (depending on physics assumptions) [78]. A striking observation in elastic scattering processes is the so called Hollowness or grayness effect [79][80][81][82]: the inelasticity density describing how different impact parameters contribute to the inelastic cross section has a maximum at a non-zero impact parameter at LHC energies. On the other hand, at lower ISR energies the maximum is at b T = 0 at ISR energies.…”

Section: A Elastic Scatteringsupporting

confidence: 57%

Review of proton and nuclear shape fluctuations at high energy

Mäntysaari

2020

Preprint

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Section: A Elastic Scatteringsupporting

confidence: 57%

Review of proton and nuclear shape fluctuations at high energy

Mäntysaari

2020

Preprint

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“…Then, from some s sufficiently high the energy of both pp and pp possess the same behavior at b=0. However, there exist some models indicating this result may be achieved at some ¹ b 0 [41,61]. The implication of that is the appearance of a gray area in the inelastic overlap function near b=0.…”

Section: Te In the Impact Parameter Spacementioning

confidence: 99%

The Tsallis entropy and the BKT-like phase transition in the impact parameter space for pp and $\bar{p}p$ collisions

2020

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In this paper, one uses the Tsallis entropy in the impact parameter space to study pp andpp inelastic overlap function and the energy density filling up mechanism responsible by the so-called black disk limit as the energy increases. The Tsallis entropy is non-additive and non-extensive and these features are of fundamental importance since the internal constituents of pp andpp are strongly correlated and also the existence of the multifractal character of the total cross-section. The entropy approach presented here takes into account a phase transition occurring inside the hadrons as the energy increases. This phase transition in the impact parameter space is quite similar to the Berezinskii-Kosterlitz-Thouless phase transition, possessing also a topological feature due to the multifractal dimension of the total cross-sections in pp andpp scattering.

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“…On the other hand, the analyses of the pp elastic differential cross section data from the TOTEM experiment at √ s = 7 TeV [20] are suggestive of a new and counterintuitive feature of hadronic interactions: the maximum of the inelasticity profile is reached in non-central collisions [21][22][23][24]. This phenomenon, not observed before at lower energies, has been referred to as hollowness effect in the literature [25].…”

Section: Introductionmentioning

confidence: 97%

Correlated wounded hot spots in proton-proton interactions

2017

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We investigate the effect of non-trivial spatial correlations between proton constituents, considered in this work to be gluonic hot spots, on the initial conditions of proton-proton collisions from ISR to LHC energies, i.e. $\sqrt s\!=\!52.6,7000,13000$ GeV. The inclusion of these correlations is motivated by their fundamental role in the description of a recently observed new feature of $pp$ scattering at $\sqrt s\!=\!7$ TeV, the hollowness effect. Our analysis relies on a Monte-Carlo Glauber approach including fluctuations in the hot spot positions and their entropy deposition in the transverse plane. We explore both the energy dependence and the effect of spatial correlations on the number of wounded hot spots, their spatial distribution and the eccentricities, $\varepsilon_n$, of the initial state geometry of the collision. In minimum bias collisions we find that the inclusion of short range repulsive correlations between the hot spots reduces the value of the eccentricity ($\varepsilon_2$) and the triangularity ($\varepsilon_3$). In turn, upon considering only the events with the highest entropy deposition i.e. the ultra-central ones, the probability of having larger $\varepsilon_{2,3}$ increases significantly in the correlated scenario. Finally, the eccentricities show a quite mild energy dependence.Comment: Manuscript restructured and extended to include a centrality study and probability distributions instead of averages . Accepted for publication in Phys. Rev.

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Will protons become gray at 13 TeV and 100 TeV?

Cited by 7 publications

References 17 publications

Review of proton and nuclear shape fluctuations at high energy

Review of proton and nuclear shape fluctuations at high energy

The Tsallis entropy and the BKT-like phase transition in the impact parameter space for pp and $\bar{p}p$ collisions

Correlated wounded hot spots in proton-proton interactions

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