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- Bierlich, Christian, et al.
(författare)
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Jet modifications from colour rope formation in dense systems of non-parallel strings
- 2022
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Ingår i: SciPost Physics. - 2542-4653. ; 13:2
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Tidskriftsartikel (refereegranskat)abstract
- We revisit our rope model for string fragmentation that has been shown to give a reasonable description of strangeness and baryon enhancement in high-multiplicity pp events at the LHC. A key feature of the model is that the enhancement is driven by the increased string tension due to strings overlapping in dense systems. By introducing an improved space–time picture for the overlap between fragmenting strings, where also non-parallel strings are properly taken into account, we are now able to investigate the enhancement both in jets and in the underlying event in a consistent way.
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- Bierlich, Christian, et al.
(författare)
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Strangeness enhancement across collision systems without a plasma
- 2022
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Ingår i: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics. - : Elsevier BV. - 0370-2693. ; 835
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Tidskriftsartikel (refereegranskat)abstract
- We present novel rope hadronization results for strange hadron enhancement in pp, pPb, and PbPb collisions using PYTHIA/Angantyr at LHC energies. With the rope model for string fragmentation, we find that the strangeness and baryon enhancement has a coherent increase across all collision systems as a function of average charged central multiplicity, in qualitative agreement with LHC data. In AA collisions, we find that the baryonic yields overshoot data at high multiplicities, and we discuss how a combination of rope hadronization with other string interactions may tame this rise.
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- Chakraborty, Smita, et al.
(författare)
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Impact of string interactions on the space–time evolution of hadronic vertices
- 2023
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Ingår i: European Physical Journal C. - 1434-6044 .- 1434-6052. ; 83:6
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Tidskriftsartikel (refereegranskat)abstract
- We investigate the space–time picture of string evolution and hadron production in a fully string-based model for high energy collisions involving heavy-ions. We find that although the density of strings is quite large at the time of hadronization in a central heavy-ion collision, the initial overlap between them right after the collisions is not necessarily large. We also find that when including string-string interactions using the so-called shoving model, the density of strings is decreased which should dampen the rapid increase in string tension in the rope hadronization with multiplicity that we found in a previous paper.
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- Chakraborty, Smita
(författare)
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Investigation of Quark Gluon Plasma-like signals with Lund string interactions
- 2022
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- This thesis investigates the interactions that occur in extreme densities for high-energy collisions of subatomic particles. The theoretical models developed for this purpose are based on the Lund model. The developments have been implemented as a new module called Gleipnir to the Monte-Carlo event generator, P YTHIA . The two models developed are string shoving and rope hadronization, and can now be used for proton-proton, proton-nucleus and nucleus-nucleus collisions.Paper I presents a novel method to calculate string shoving in all systems. The strings are considered as colour flux-tubes, with colour electric fields with transverse extent. The force between two colour flux tubes is calculated in a special Lorentz frame called the parallel frame. Final state collectivity reproduced by string shoving is investigated in both small and large systems. We conclude that further modifications to string shoving are required to be able to produce a better agreement with experimental data for large systems.Paper II presents the rope hadronization mechanism using the parallel frame. Rope hadronization would modify the strangeness yields, and this effect can be observed in jets as well. The system of interest is jet-triggered proton-proton collisions, where we probe the yields of strange hadrons and baryons in a jet. We find significant enhance-ment of strangeness, particularly strange baryons in the jet.Paper III shows the enhancement in strangeness yields with rope hadronization in all systems, using the tech-niques introduced in Paper I and Paper II. The formalism produces significant improvements over default Pythia and Angantyr. To be able to reproduce a better agreement to data, further modifications are necessary, such as the inclusion of string shoving mechanism.Paper IV describes the correction to production vertices of primary hadrons from string interactions for both small and large systems. The impact from string shoving is found to be higher than compared to rope hadronization. This would influence other P YTHIA processes that build on primary hadronic vertices such as hadronic rescattering.
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- Chakraborty, Smita
(författare)
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String shoving effects on jets in p-p collisions
- 2021
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Ingår i: 10th International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions, HardProbes 2020. - Trieste, Italy : Sissa Medialab. - 1824-8039. ; 387
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Konferensbidrag (refereegranskat)abstract
- Di-jet observables are excellent probes to study the effect of jets in dense systems. Interacting Lund strings will affect jet observables and suggests a new common mechanism responsible for jet modification in p-A and A-A. In this proceeding, we present our new implementation of the string shoving mechanism in PYTHIA8 which lets us study the effects on jet observables in p-p and nuclear collisions. We also present preliminary results showing the effects in hadron-jet correlation studies.
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