Fragmentation of two repelling Lund strings

Duncan, Cody B.

doi:10.21468/scipostphys.8.5.080

Cited by 8 publications

(7 citation statements)

References 63 publications

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“…Finally, the model only considers the effect of hadrons colliding with hadrons, not those of strings colliding/overlapping with each other or with hadrons. The former is actively being studied within Pythia, as a shoving/repulsion of strings [16,52]. Both shove and rescattering act to correlate the spatial location of strings/hadrons with a net push outwards, giving rise to a radial flow.…”

Section: The Space-time Picture Of Hadronic Rescatteringmentioning

confidence: 99%

A framework for hadronic rescattering in pp collisions

Sjöstrand

Utheim

2020

Eur. Phys. J. C

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In this article, a framework for hadronic rescattering in the general-purpose Pythia event generator is introduced. The starting point is the recently presented space–time picture of the hadronization process. It is now extended with a tracing of the subsequent motion of the primary hadrons, including both subsequent scattering processes among them and decays of them. The major new component is cross-section parameterizations for a range of possible hadron–hadron combinations, applicable from threshold energies upwards. The production dynamics in these collisions has also been extended to cope with different kinds of low-energy processes. The properties of the model are studied, and some first comparisons with LHC $$\mathrm {p}\mathrm {p}$$ p p data are presented. Whereas it turns out that approximately half of all final particles participated in rescatterings, the net effects in $$\mathrm {p}\mathrm {p}$$ p p events are still rather limited, and only striking in a few distributions. The new code opens up for several future studies, however, such as effects in $$\mathrm {p}$$ p A and AA collisions.

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Section: The Space-time Picture Of Hadronic Rescatteringmentioning

confidence: 99%

A framework for hadronic rescattering in pp collisions

Sjöstrand

Utheim

2020

Eur. Phys. J. C

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“…[95]. Later on, several models that consider string interactions were argued to lead to azimuthal asymmetries: string percolation [96][97][98] with the creation of azimuthally anisotropic strong chromoelectric fields, colour reconnection [99] that is able to produce some of the QGP-like features observed in pp, and string repulsion [100,101]. It is not clear whether the dynamics contained in these approaches can be considered as pure initial state but they offer a mechanism to produce the ridge in collisions between small systems that does not require any explicit final state rescattering, see [102] for a model that explicitly requires parton and/or hadron rescattering to build azimuthal asymmetries even with just two strings.…”

Section: Non-cgc Explanationsmentioning

confidence: 99%

Particle correlations from the initial state

Altinoluk

Armesto

2020

Eur. Phys. J. A

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The observation in small size collision systems, pp and pA, of strong correlations with long range in rapidity and a characteristic structure in azimuth, the ridge phenomenon, is one of the most interesting results obtained at the large hadron collider. Earlier observations of these correlations in heavy ion collisions at the relativistic heavy ion collider are standardly attributed to collective flow due to strong final state interactions, described in the framework of viscous relativistic hydrodynamics. Even though data for small size systems are well described in this framework, the applicability of hydrodynamics is less well grounded and initial state based mechanisms have been suggested to explain the ridge. In this review, we discuss particle correlations from the initial state point of view, with focus on the most recent theoretical developments.

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“…An interesting extension to our model could be to allow for background fields to modify the effective tension as well; this could provide an avenue for incorporating collective effects in this framework, possibly in conjunction with asymmetric contributions to the p ⊥ distributions to represent repulsion effects along a similar vein as recently proposed in [40].…”

Section: Discussionmentioning

confidence: 94%

String fragmentation with a time-dependent tension

Hunt-Smith

2020

Eur. Phys. J. C

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Motivated by recent theoretical arguments that expanding strings can be regarded as having a temperature that is inversely proportional to the proper time, $$\tau $$ τ , we investigate the consequences of adding a term $$\propto 1/\tau $$ ∝ 1 / τ to the string tension in the Lund string-hadronization model. The lattice value for the tension, $$\kappa _0 \sim 0.18\,{\mathrm {GeV}}^2\sim 0.9\,{\mathrm {GeV}}/{\mathrm {fm}}$$ κ 0 ∼ 0.18 GeV 2 ∼ 0.9 GeV / fm , is then interpreted as the late-time/equilibrium limit. A generic prediction of this type of model is that early string breaks should be associated with higher strangeness (and baryon) fractions and higher fragmentation $$\langle p_\perp \rangle $$ ⟨ p ⊥ ⟩ values. It should be possible to use archival ee data sets to provide model-independent constraints on this type of scenario, and we propose a few simple key measurements to do so.

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Fragmentation of two repelling Lund strings

Cited by 8 publications

References 63 publications

A framework for hadronic rescattering in pp collisions

A framework for hadronic rescattering in pp collisions

Particle correlations from the initial state

String fragmentation with a time-dependent tension

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