Lund string model

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. (Compare to electric or magnetic field lines, which are spread out because the carrier of the electromagnetic force, the photon, does not interact with itself.)

String fragmentation is one of the parton fragmentation models used in the PYTHIA/Jetset and UCLA event generators, and explains many features of hadronization quite well. In particular, the model predicts that in addition to the particle jets formed along the original paths of two separating quarks, there will be a spray of hadrons produced between the jets by the string itself—which is precisely what is observed.

Note: this use of "string" is "not" the same as in string theory, in which strings are the fundamental objects of nature rather than collections of field lines.

References

* B. Andersson "et al.", "Parton Fragmentation and String Dynamics", [http://www.elsevier.com/locate/physrep/ "Phys. Rep."] 97(2 & 3), 31–145 (1983).


Wikimedia Foundation. 2010.

Игры ⚽ Нужна курсовая?

Look at other dictionaries:

  • Dual resonance model — In theoretical physics, a dual resonance model arose the early investigation (1968–1974) of string theory as an S matrix theory of the strong interaction. It was based upon the observation that the amplitudes for the s channel scatterings matched …   Wikipedia

  • Jet (particle physics) — A jet is a narrow cone of hadrons and other particles produced by the hadronization of a quark or gluon in a particle physics or heavy ion experiment. Because of QCD confinement, particles carrying a color charge, such as quarks, cannot exist in… …   Wikipedia

  • Three jet event — In particle physics, a three jet event is an event with many particles in final state that appear to be clustered in three jets. A single jet consists of particles that fly off in roughly the same direction. One can draw three cones from the… …   Wikipedia

  • Hadronization — In particle physics, hadronization is the process of the formation of hadrons out of quarks and gluons. This occurs after high energy collisions in a particle collider in which free quarks or gluons are created. Due to colour confinement, these… …   Wikipedia

  • QCD vacuum — The QCD vacuum is the vacuum state of quantum chromodynamics (QCD). It is an example of a non perturbative vacuum state, characterized by many non vanishing condensates such as the gluon condensate or the quark condensate. These condensates… …   Wikipedia

  • Kammerlader — Infobox Weapon|is ranged=yes name=Kammerlader caption=The breech end of two Kammerlader rifles origin=Norway type=Breech loading rifle designer=Unknown design date=1842 service=1842 ndash; 1870 cartridge=Minié ball in paper cartridge action=See… …   Wikipedia

  • performing arts — arts or skills that require public performance, as acting, singing, or dancing. [1945 50] * * * ▪ 2009 Introduction Music Classical.       The last vestiges of the Cold War seemed to thaw for a moment on Feb. 26, 2008, when the unfamiliar strains …   Universalium

  • literature — /lit euhr euh cheuhr, choor , li treuh /, n. 1. writings in which expression and form, in connection with ideas of permanent and universal interest, are characteristic or essential features, as poetry, novels, history, biography, and essays. 2.… …   Universalium

  • Sweden — /sweed n/, n. a kingdom in N Europe, in the E part of the Scandinavian Peninsula. 8,946,193; 173,732 sq. mi. (449,964 sq. km). Cap.: Stockholm. Swedish, Sverige. * * * Sweden Introduction Sweden Background: A military power during the 17th… …   Universalium

  • Sweden — This article is about the country. For other uses, see Sweden (disambiguation). Kingdom of Sweden Konungariket Sverige …   Wikipedia

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”