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- Bierlich, Christian, et al.
(författare)
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Diffractive and non-diffractive wounded nucleons and final states in pA collisions
- 2016
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Ingår i: Journal of High Energy Physics. - 1029-8479. ; 2016:10
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Tidskriftsartikel (refereegranskat)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 model 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 Pythia8.
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| 4. |
- Bierlich, Christian
(författare)
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Hadronisation models and colour reconnection
- 2016
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Ingår i: Proceedings of Science. ; 11
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Konferensbidrag (refereegranskat)abstract
- Enhanced production of hadrons with s-quark content has been observed in pp collisions at LHC, and earlier in collisions of heavy nuclei. We review the string hadronisation formalism and corrections from rope hadronisation and colour reconnection. Both are corrections which take place in such dense environments, and both improve existing descriptions of data. Since such corrections are very sensitive to the modelling of transverse proton structure, we investigate two such models, and compare to final states. Finally we describe how such corrections can also give a possible explanation to collective phenomena observed in small systems.
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| 5. |
- Bierlich, Christian
(författare)
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Jagten på den niende planet
- 2016
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Ingår i: Illustreret Videnskab. - 0109-2456. ; 2016:12
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Tidskriftsartikel (populärvet., debatt m.m.)
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| 6. |
- Bierlich, Christian
(författare)
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Rope Hadronization, Geometry and Particle Production in pp and pA Collisions
- 2016
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- This thesis concerns models of high energy collisions of sub-atomic particles, and the models’ implementation in numerical simulations; so–called Monte Carlo event generators. The models put forth in the thesis improves the description of soft collisions of protons, and takes the first steps towards a new, microscopic description of collectivity in proton collisions and collisions of heavy nuclei such as lead.Paper I. The Lund string hadronization model is reviewed, and a model for corrections in busy environments, such as pp minimum bias, are introduced, and its implementation in the event generator DIPSY is described. The model affects the hadrochemistry of the underlying event, and improves description of existing pp data from LHC and RHIC.Paper II. A series of new observables sensitive to effects from rope hadronization is introduced, and predictions of the rope hadronization model is compared to predictions from a similar model based on junction formation.Paper III. The Glauber formalism for collisions of nuclei is reviewed, and contributions from diffraction are considered. The Glauber–Gribov formalism for colour fluctuations is compared to the DIPSY model. On the basis of this comparision, corrections to the Glauber–Gribov parametrization of the pp cross section are suggested.This corrected formalism is then coupled to a particle production model, and preliminary descriptions of particle production in pA is given.Paper IV. A model for string–shoving, expanding on the model from Paper I, is introduced at the proof–of–concept level. It is shown that the model qualitatively produces a rise of mean-p ⊥ with hadron mass and long range azimuthal correlations in pp collisions.
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