Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
The Lund fragmentation process for a multi-gluon string according to the area law
Autore:
Andersson, B; Mohanty, S; Soderberg, F;
Indirizzi:
Lund Univ, Dept Theoret Phys, S-22362 Lund, Sweden Lund Univ Lund SwedenS-22362 v, Dept Theoret Phys, S-22362 Lund, Sweden
Titolo Testata:
EUROPEAN PHYSICAL JOURNAL C
fascicolo: 4, volume: 21, anno: 2001,
pagine: 631 - 647
SICI:
1434-6044(200107)21:4<631:TLFPFA>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Soggetto:
JET FRAGMENTATION; QCD CASCADES; MODEL;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
12
Recensione:
Indirizzi per estratti:
Indirizzo: Andersson, B Lund Univ, Dept Theoret Phys, Solvegatan 14A, S-22362 Lund, Sweden Lund Univ Solvegatan 14A Lund Sweden S-22362 62 Lund, Sweden
Citazione:
B. Andersson et al., "The Lund fragmentation process for a multi-gluon string according to the area law", EUR PHY J C, 21(4), 2001, pp. 631-647

Abstract

The Lund area law describes the probability for the production of a set ofcolourless hadrons from an initial set of partons, in the Lund string fragmentation model. It was derived from classical probability concepts but haslater been interpreted as the result of gauge invariance in terms of the Wilson gauge loop integrals. In this paper we will present a general method to implement the area law for a multigluon string state. In this case the world surface of the massless relativistic string is a geometrically bent (1+ 1)-dimensional surface embedded in the (1 + 3)-dimensional Minkowski space. The partonic states are in general given by a perturbative QCD cascade and are consequently defined only down to a cutoff in the energy-momentum fluctuations. We will show that our method defines the states down to the hadronic mass scale inside an analytically calculable scenario. We will then show that there is a differential version of our process which is closely related to the generalized rapidity range A, which has been used as a measure on the partonic states. We identify A as the area spanned between the directrix curve (the curve given by the parton energy-momentum vectors laid out in colour order, which determines the string surface) and the average curve (to be called the P-curve) of the stochastic X-curves (curves obtained when the hadronic energy-momentum vectors are laid out in rank order). Finally we show that from the X-curve corresponding to a particular stochastic fragmentation situation it is possible to reproduce the directrix curve (up to one starting vector and a set of sign choices, one for each hadron). This relationship provides an analytical formulation of the notion of parton-hadron duality. The whole effort is made in order to get a new handle to treat the transition region between where we expect perturbative QCD to work and where the hadronic features become noticeable.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/05/20 alle ore 15:44:05