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Diffractive and non-diffractive wounded nucleons and final states in pA collisions
High Energy Physics - Phenomenology · Submitted 15 Jul 2016
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim We argue that there is room for improvement in these models when it comes to the treatment of diffractive excitation processes, and present a new simple Glauber-like model where these processes are better taken into account.
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The abstract, sentence by sentence
We review the state-of-the-art of Glauber-inspired models for estimating the distribution of the number of participating nucleons in pA and AA collisions. We argue that there is room for improvement in these models when it comes to the treatment of diffractive excitation processes, and present a new simple Glauber-like model where these processes are better taken into account. We also suggest a new way of using the number of participating, or wounded, nucleons to extrapolate event characteristics from pp collisions, and hence get an estimate of basic hadronic final-state properties in pA collisions, which may be used to extract possible nuclear effects. The new method is inspired by the Fritiof model, but based on the full, semi-hard multiparton interaction model of Pythia 8.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | We review the state-of-the-art of Glauber-inspired models for estimating the distribution of the number of participating nucleons in pA and AA collisions. | background 0.98 | 0.17 | 0.04 | asserted 0.82 |
| s1 | We argue that there is room for improvement in these models when it comes to the treatment of diffractive excitation processes, and present a new simple Glauber-like model where these processes are better taken into account. | contribution 0.92 | 0.84 | 0.38 | hedged possibility 0.59 |
| s2 | We also suggest a new way of using the number of participating, or wounded, nucleons to extrapolate event characteristics from pp collisions, and hence get an estimate of basic hadronic final-state properties in pA collisions, which may be used to extract possible nuclear effects. | contribution 0.91 | 0.75 | 0.32 | hedged possibility 0.99 |
| s3 | The new method is inspired by the Fritiof model, but based on the full, semi-hard multiparton interaction model of Pythia 8. | method 0.99 | 0.54 | 0.07 | asserted 1.00 |
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The paper
Original abstract
We review the state-of-the-art of Glauber-inspired models for estimating the distribution of the number of participating nucleons in pA and AA collisions. We argue that there is room for improvement in these models when it comes to the treatment of diffractive excitation processes, and present a new simple Glauber-like model where these processes are better taken into account. We also suggest a new way of using the number of participating, or wounded, nucleons to extrapolate event characteristics from pp collisions, and hence get an estimate of basic hadronic final-state properties in pA collisions, which may be used to extract possible nuclear effects. The new method is inspired by the Fritiof model, but based on the full, semi-hard multiparton interaction model of Pythia 8.
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References
How the literature uses it
22 arXiv papers cite this in 51 sentences
Papers citing it · 27 sentences without a confident label
Builds on it 2 papers
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[ref] , and is based on the following points:
The Angantyr model for Heavy-Ion Collisions in PYTHIA8 · Conclusion and Outlook · 0.99
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Our plan is then to include these effects in our model for collisions with nuclei [ref] , to see if they can adequately describe data showing collective effects in these larger systems.
Collectivity without plasma in hadronic collisions · Introduction · 0.90
Uses its method or tool 11 papers
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The extension of this model, Angantyr [ref] , underpins all heavy ion results presented in this review.
String interactions as a source of collective behaviour · Multi-parton interactions and the Angantyr model · 0.90
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As described in [ref] we will generate these secondary absorptive sub-collisions as if they were single diffractive excitation events.
The Angantyr model for Heavy-Ion Collisions in PYTHIA8 · Adding secondary absorptive interactions. · 0.95
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[ref] the main event and the following hard sub-collisions are chosen to be the hardest of a $N_sub$ of absorptive QCD events.
PISTA: Posterior Ion STAcking · Combination of events · 0.80
Compares with it 1 paper
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The green dashed and blue dot-dashed lines are single diffractive events generated by using the modifications presented in [ref] and the modifications presented in this article respectively.
The Angantyr model for Heavy-Ion Collisions in PYTHIA8 · Modifications of single diffractive to secondary absorptive · 0.97
Cites it as background 4 papers
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On the other hand, generators such as HIJING [ref] or the recent Angantyr addition to Pythia 8 [ref] aim to describe the full event.
PISTA: Posterior Ion STAcking · Introduction · 0.89
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Various research papers in the field have already explored this approach [ref] but all of them with the eikonal scheme.
A multi-channel U-Matrix model of hadron interaction at high energy · Theoretical framework · 0.91
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While there is a vast literature on fluctuations in the proton wave function on the theory side [ref] , observables to constrain them are still scarce [ref] , and we will show that proton-nucleus collisions bring new, non-trivial constraints.
Multiplicity fluctuations and correlations in 5.02 TeV p+Pb collisions at zero impact parameter · Introduction · 0.91
What it cites · 48 sentences without a confident label
Uses the method or tool of 8 papers
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We will describe the nucleus' transverse structure using a Woods–Saxon distribution in the GLISSANDO parameterisation [ref] , where the density is given by: [equation] where $R$ is the nuclear radius, $a$ is “skin width”, and $ρ_0$ is the central density.
GLISSANDO 2: GLauber Initial-State Simulation AND mOre..., ver. 2 · Inclusively wounded nucleons · 1.00
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We will describe the nucleus' transverse structure using a Woods–Saxon distribution in the GLISSANDO parameterisation [ref] , where the density is given by: [equation] where $R$ is the nuclear radius, $a$ is “skin width”, and $ρ_0$ is the central density.
GLISSANDO: GLauber Initial-State Simulation AND mOre · Inclusively wounded nucleons · 1.00
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To guide us in our investigation of conventional Glauber models we use the Monte Carlo program [ref] , which is based on Mueller's dipole approach to BFKL evolution [ref] , but also includes important non-leading effects, saturation and confinement.
Small-x Dipole Evolution Beyond the Large-N_c Limit · Introduction · 1.00
Uses data or values from 8 papers
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With data from [ref] and [ref] for elastic and single diffractive cross sections and elastic forward slope, supplemented by the assumption that the diffractive slope is approximately half the elastic (as is the case at 560 GeV [ref] ), we get for 7 TeV the estimated width $√(⟨σ^2⟩- ⟨σ⟩^2) ≈0.4 ⟨σ⟩$.
Proton-proton elastic scattering at the LHC energy of {\surd} = 7 TeV · total cross section · 0.99
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With data from [ref] and [ref] for elastic and single diffractive cross sections and elastic forward slope, supplemented by the assumption that the diffractive slope is approximately half the elastic (as is the case at 560 GeV [ref] ), we get for 7 TeV the estimated width $√(⟨σ^2⟩- ⟨σ⟩^2) ≈0.4 ⟨σ⟩$.
First measurement of the total proton-proton cross section at the LHC energy of {\surd} s =7 TeV · total cross section · 0.99
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With data from [ref] and [ref] for elastic and single diffractive cross sections and elastic forward slope, supplemented by the assumption that the diffractive slope is approximately half the elastic (as is the case at 560 GeV [ref] ), we get for 7 TeV the estimated width $√(⟨σ^2⟩- ⟨σ⟩^2) ≈0.4 ⟨σ⟩$.
Measurement of inelastic, single- and double-diffraction cross sections in proton-proton collisions at the LHC with ALICE · total cross section · 0.99
Compares with 1 paper
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The agreement of the fluctuating gray disk with results for collisions are not superior to those of the black disk model [ref] .
Total, inelastic and (quasi-)elastic cross sections of high energy pA and gamma-A reactions with the dipole formalism · Models including fluctuations · 0.85
Cites as support 2 papers
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This is important since experiments at high energy colliders show, that diffractive excitation is a significant fraction of the total cross section, and not limited to low masses (see [ref] ).
Rapidity gap cross sections measured with the ATLAS detector in pp collisions at sqrt(s) = 7 TeV · Introduction · 0.97
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This is important since experiments at high energy colliders show, that diffractive excitation is a significant fraction of the total cross section, and not limited to low masses (see [ref] ).
Measurement of diffraction dissociation cross sections in pp collisions at sqrt(s) = 7 TeV · Introduction · 0.97
Cites as background 19 papers
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This formalism was first applied to collisions by Miettinen and Pumplin [ref] , and later within the formalism for QCD cascades by Hatta et al. [ref] and by Avsar and coworkers [ref] .
Diffractive Excitation in DIS and pp Collisions · Diffractive excitation and the Good–Walker formalism · 0.85
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This formalism was first applied to collisions by Miettinen and Pumplin [ref] , and later within the formalism for QCD cascades by Hatta et al. [ref] and by Avsar and coworkers [ref] .
Diffusive scaling and the high-energy limit of deep inelastic scattering in QCD at large N_c · Diffractive excitation and the Good–Walker formalism · 0.85
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This formalism was first applied to collisions by Miettinen and Pumplin [ref] , and later within the formalism for QCD cascades by Hatta et al. [ref] and by Avsar and coworkers [ref] .
Fluctuations, Saturation, and Diffractive Excitation in High Energy Collisions · Diffractive excitation and the Good–Walker formalism · 0.85
Discussion
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