Lesson plan
Lund string model
In particle physics, the Lund string model is a phenomenological model of hadronization. It treats all but the highest-energy gluons as field lines, which are attracted to each other due to the gluon self-interaction and so form a narrow tube (or string) of strong color field. (Electromagnetic field lines do not stringify, but instead spread out, because the photon, carrier of the electromagnetic force, does not self-interact.) The model is named after the particle theory group of Lund University, which developed it. It was derived from the 1977 PhD thesis of Carsten Peterson, supervised by Bo Andersson and Gösta Gustafson. The model was refined by the contributions of researchers of the group, like Torbjörn Sjöstrand, Bo Söderberg, Gunnar Ingelman, Hans-Uno Bengtsson, and Ulf Pettersson. In 1979, the model was able to describe gluon jet fragmentation by considering the force field to be similar to a massless relativistic string. The model successfully predicted a specific asymmetry in the particles produced in electron–positron collisions, observed in 1980. String fragmentation is one of the parton fragmentation models used in the PYTHIA/Jetset and the University of California, Los Angeles as event generators, and explains many features of hadronization quite well.…
Article summary
In particle physics, the Lund string model is a phenomenological model of hadronization. It treats all but the highest-energy gluons as field lines, which are attracted to each other due to the gluon self-interaction and so form a narrow tube (or string) of strong color field. (Electromagnetic field lines do not stringify, but instead spread out, because the photon, carrier of the electromagnetic force, does not self-interact.) The model is named after the particle theory group of Lund University, which developed it. It was derived from the 1977 PhD thesis of Carsten Peterson, supervised by Bo Andersson and Gösta Gustafson. The model was refined by the contributions of researchers of the group, like Torbjörn Sjöstrand, Bo Söderberg, Gunnar Ingelman, Hans-Uno Bengtsson, and Ulf Pettersson. In 1979, the model was able to describe gluon jet fragmentation by considering the force field to be similar to a massless relativistic string. The model successfully predicted a specific asymmetry in the particles produced in electron–positron collisions, observed in 1980. String fragmentation is one of the parton fragmentation models used in the PYTHIA/Jetset and the University of California, Los Angeles as event generators, and explains many features of hadronization quite well.…
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Discussion questions
- Summarise the article in your own words. Which single claim would you verify first, and why?
- Which claim in this article is most likely to be revised as the sources update? How would you check its current status?
- If two sources disagreed about one of these facts, what would you need in order to trust one over the other?
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