Exclusive final states in diffractive excitation

Christoffer Flensburg; Gosta Gustafson; Leif Lonnblad

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Exclusive final states in diffractive excitation

Christoffer Flensburg, Gosta Gustafson, Leif Lonnblad

High Energy Physics - Phenomenology · Submitted 8 Oct 2012

abstract compiled · 2026-09-23 · no language-model review

The authors' main claim We emphasize that, although diffractive excitation is basically a quantum-mechanical phenomenon with strong interference effects, it is possible to calculate the different interfering components to the amplitude in an event generator, add them and thus calculate the reaction cross section for exclusive diffractive final states.

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What the abstract itself states, as probabilities: claims first 0.04 · states limitation 0.28 · human participants 0.01 · controlled comparison 0.06 · randomized assignment 0.01 · states quantitative result 0.05 · compares with prior results 0.69 · mentions code or data availability 0.12.

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In this paper we describe a formalism for generating exclusive final states in diffractive excitation, based on the optical analogy where diffraction is fully determined by the absorption into inelastic channels. The formalism is based on the Good--Walker formalism for diffractive excitation, and it is assumed that the virtual parton cascades represent the diffractive eigenstates defined by a definite absorption amplitude. We emphasize that, although diffractive excitation is basically a quantum-mechanical phenomenon with strong interference effects, it is possible to calculate the different interfering components to the amplitude in an event generator, add them and thus calculate the reaction cross section for exclusive diffractive final states. The formalism is implemented in the DIPSY event generator, introducing no tunable parameters beyond what has been determined previously in studies of non-diffractive events. Some early results from DIS and proton-proton collisions are presented, and compared to experimental data.

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What the classifier reports for each sentence. The number is the probability it gave the label.
#	sentence	role	the authors' own work	states the main conclusion	strength
s0	In this paper we describe a formalism for generating exclusive final states in diffractive excitation, based on the optical analogy where diffraction is fully determined by the absorption into inelastic channels.	contribution 0.92	0.83	0.19	asserted 0.99
s1	The formalism is based on the Good--Walker formalism for diffractive excitation, and it is assumed that the virtual parton cascades represent the diffractive eigenstates defined by a definite absorption amplitude.	method 0.90	0.25	0.08	asserted 0.99
s2	We emphasize that, although diffractive excitation is basically a quantum-mechanical phenomenon with strong interference effects, it is possible to calculate the different interfering components to the amplitude in an event generator, add them and thus calculate the reaction cross section for exclusive diffractive final states.	method 0.82	0.60	0.35	hedged possibility 0.85
s3	The formalism is implemented in the DIPSY event generator, introducing no tunable parameters beyond what has been determined previously in studies of non-diffractive events.	method 0.78	0.88	0.10	asserted 1.00
s4	Some early results from DIS and proton-proton collisions are presented, and compared to experimental data.	result 0.76	0.84	0.07	asserted 0.93

What kind of paper the classifier reports this is: method or tool 0.99 · evidence from simulation or computation 0.92.

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The paper

Original abstract

In this paper we describe a formalism for generating exclusive final states in diffractive excitation, based on the optical analogy where diffraction is fully determined by the absorption into inelastic channels. The formalism is based on the Good--Walker formalism for diffractive excitation, and it is assumed that the virtual parton cascades represent the diffractive eigenstates defined by a definite absorption amplitude. We emphasize that, although diffractive excitation is basically a quantum-mechanical phenomenon with strong interference effects, it is possible to calculate the different interfering components to the amplitude in an event generator, add them and thus calculate the reaction cross section for exclusive diffractive final states. The formalism is implemented in the DIPSY event generator, introducing no tunable parameters beyond what has been determined previously in studies of non-diffractive events. Some early results from DIS and proton-proton collisions are presented, and compared to experimental data.

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References

Forward citations

Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

Effects of Overlapping Strings in pp Collisions
hep-ph 2014-12 conditional novelty 6.0 of 10

Overlapping colour strings in proton-proton collisions, modelled as ropes with tension set by SU(3) Casimir differences, reproduce the observed enhancement of strange and baryon production at LHC energies.
Improving the kinematics for low-x QCD evolution equations in coordinate space
hep-ph 2014-01 conditional novelty 6.0 of 10

A kinematically constrained version of the BK equation in mixed space is derived, with the constraint shown to be local in the dipole cascade and with explicit counter-terms for NLO observables and NLL evolution.
Revealing proton shape fluctuations with incoherent diffraction at high energy
hep-ph 2016-07 conditional novelty 4.0 of 10

HERA incoherent diffractive J/psi data are reproduced only if the proton's small-x gluon distribution is strongly lumpy, with small hot spots spread far from the proton center.

How the literature uses it

6 arXiv papers cite this in 10 sentences

Each citing sentence is taken from the citing paper's LaTeX source and typed by Pith's classifier. A label appears at probability 0.8 or more (0.95 for support), a contest at 0.7 or more; the quoted words are the citing authors'. How each label was checked · JSON

Papers citing it · 7 sentences without a confident label

Cites it as support 1 paper

Excluding non-linear effects, the model reproduces the triple-pomeron form for diffractive excitation [ref] , and including also effects of saturation it reproduced both inclusive and exclusive diffractive data in DIS and $pp$ collisions [ref] .

The Relation between the Good-Walker and Triple-Regge Formalisms for Diffractive Excitation · Conclusion · 1.00

Cites it as background 1 paper

In the analyses mentioned above, this formalism was used to describe low mass diffraction, but it has also been proposed to describe the full spectrum of excitation masses in the early work by Miettinnen and Pumplin [ref] , and more recently by Hatta et al. [ref] , and by the Lund group [ref] .

The Relation between the Good-Walker and Triple-Regge Formalisms for Diffractive Excitation · Introduction · 0.82

What it cites · 51 sentences without a confident label

Builds on 4 papers

The formalism is an extension of the Lund Dipole Cascade model implemented in the DIPSY MC [ref] , which is based on BFKL evolution, including essential non-leading effects, and saturation within the cascade evolution.

Inclusive and Exclusive observables from dipoles in high energy collisions · Introduction · 0.90
The formalism is an extension of the Lund Dipole Cascade model implemented in the DIPSY MC [ref] , which is based on BFKL evolution, including essential non-leading effects, and saturation within the cascade evolution.

Energy Conservation and Saturation in Small-x Evolution · Introduction · 0.90
The model is a generalization of Mueller's dipole cascade model [ref] , including also non-leading effects and saturation effects within the evolution.

Single and Double BFKL Pomeron Exchange and a Dipole Picture of High Energy Hard Processes · Conclusions · 0.89

Uses the method or tool of 4 papers

([ref], [ref]) can be used to generate diffractive events with the event generator [ref] .

Inclusive and Exclusive observables from dipoles in high energy collisions · Implementation in · 0.96
The formalism is based on the Lund dipole cascade model, which in turn is based on BFKL evolution and saturation, and is implemented in the DIPSY event generator [ref] .

Energy Conservation and Saturation in Small-x Evolution · Conclusions · 0.89
FSR and hadronisation As in the application of the DIPSY MC for generation of non-diffractive final states [ref] , final state radiation is included in the same way as for the Linked Dipole Chain model [ref] in [ref] , and finally hadronisation using the Lund string model [ref] implemented in Pythia8 [ref] .

A Brief Introduction to PYTHIA 8.1 · Implementation in · 0.91

Uses data or values from 1 paper

Here the diffractively excited photon gives higher multiplicity and lower thrust than an $e^+e^-$-annihilation event with the same mass [ref] .

Thrust Jet Analysis of Deep-Inelastic Large-Rapidity-Gap Events · Introduction · 0.83

Compares with 4 papers

[ref] and [ref], and compared with HERA data from H1 [ref] .

Hadron Production in Diffractive Deep-Inelastic Scattering · DIS · 0.89
[ref] and [ref], and compared with HERA data from H1 [ref] .

Multiplicity Structure of the Hadronic Final State in Diffractive Deep-Inelastic Scattering at HERA · DIS · 0.89
We also want to compare our results with those from other approaches, e.g. Pythia [ref] and SHRIMPS [ref] .

Diffractive Physics · Conclusions · 0.90

Cites as support 1 paper

However, although suppressed, the rare large dipoles generated in a purely perturbative evolution with massless gluons give non-negligible effects, and eventually Froissart's bound will be violated [ref] .

On the High Energy Behaviour of The Total Cross Section in the QCD Dipole Model · The Lund dipole cascade model DIPSY · 0.96

Cites as background 12 papers

Recent analyses within this formalism include work by Kaidalov and coworkers [ref] , Ostapchenko [ref] , the Durham [ref] , and the Tel Aviv groups [ref] .

Predictions of Quark-Gluon String Model for pp at LHC · Introduction · 0.98
Recent analyses within this formalism include work by Kaidalov and coworkers [ref] , Ostapchenko [ref] , the Durham [ref] , and the Tel Aviv groups [ref] .

Monte Carlo treatment of hadronic interactions in enhanced Pomeron scheme: I. QGSJET-II model · Introduction · 0.98
Recent analyses within this formalism include work by Kaidalov and coworkers [ref] , Ostapchenko [ref] , the Durham [ref] , and the Tel Aviv groups [ref] .

High-energy strong interactions: from `hard' to `soft' · Introduction · 0.98

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