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Multiple interactions, diffraction, and the BFKL pomeron

Gustafson, Gösta LU (2011) 40th International Symposium on Multiparticle Dynamics, ISMD 2010 p.257-262
Abstract


In high energy pp scattering the inclusive cross section for minijet production is very large. Unitarity then implies a high probability for multiple interactions, and a large diffractive cross section. As the proton has a substructure in terms of parton cascades, the diffraction is not only elastic, but has a large component of diffractive excitation. The cascades can fill the whole rapidity range between projectile and target, and in the Good-Walker formalism the diffractive excitation is determined by the fluctuations in the evolution. Within the Lund Dipole Cascade model, it is in this way possible to reproduce diffractive excitation in pp collisions and DIS. The result shows a multi-regge behavior,... (More)


In high energy pp scattering the inclusive cross section for minijet production is very large. Unitarity then implies a high probability for multiple interactions, and a large diffractive cross section. As the proton has a substructure in terms of parton cascades, the diffraction is not only elastic, but has a large component of diffractive excitation. The cascades can fill the whole rapidity range between projectile and target, and in the Good-Walker formalism the diffractive excitation is determined by the fluctuations in the evolution. Within the Lund Dipole Cascade model, it is in this way possible to reproduce diffractive excitation in pp collisions and DIS. The result shows a multi-regge behavior, with a bare pomeron pole with α(0) = 1.21, α' = 0.2 GeV
-2
, and an almost constant triple-pomeron coupling g
3P
≈ 0.3 GeV
-1
. It is also pointed out that the classification of diffractive events varies between different formalisms, and cannot be uniquely defined. Therefore it is recommended to study gap events rather than diffractive events. The results presented in this talk are obtained in collaboration with Christoffer Flensburg and Leif Lönnblad.

(Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to conference
publication status
published
subject
pages
6 pages
conference name
40th International Symposium on Multiparticle Dynamics, ISMD 2010
conference location
Antwerp, Belgium
conference dates
2010-09-21 - 2010-09-25
external identifiers
  • scopus:84890029860
DOI
10.5689/UA-PROC-2010-09/33
language
English
LU publication?
yes
id
5974517c-e146-4cb1-97f6-b108dd9d6492
date added to LUP
2019-05-14 14:38:13
date last changed
2020-01-13 01:46:30
@misc{5974517c-e146-4cb1-97f6-b108dd9d6492,
  abstract     = {<p><br>
                            In high energy pp scattering the inclusive cross section for minijet production is very large. Unitarity then implies a high probability for multiple interactions, and a large diffractive cross section. As the proton has a substructure in terms of parton cascades, the diffraction is not only elastic, but has a large component of diffractive excitation. The cascades can fill the whole rapidity range between projectile and target, and in the Good-Walker formalism the diffractive excitation is determined by the fluctuations in the evolution. Within the Lund Dipole Cascade model, it is in this way possible to reproduce diffractive excitation in pp collisions and DIS. The result shows a multi-regge behavior, with a bare pomeron pole with α(0) = 1.21, α' = 0.2 GeV<br>
                            <sup>-2</sup><br>
                            , and an almost constant triple-pomeron coupling g <br>
                            <sub>3P</sub><br>
                             ≈ 0.3 GeV<br>
                            <sup>-1</sup><br>
                            . It is also pointed out that the classification of diffractive events varies between different formalisms, and cannot be uniquely defined. Therefore it is recommended to study gap events rather than diffractive events. The results presented in this talk are obtained in collaboration with Christoffer Flensburg and Leif Lönnblad.<br>
                        </p>},
  author       = {Gustafson, Gösta},
  language     = {eng},
  month        = {12},
  pages        = {257--262},
  title        = {Multiple interactions, diffraction, and the BFKL pomeron},
  url          = {http://dx.doi.org/10.5689/UA-PROC-2010-09/33},
  doi          = {10.5689/UA-PROC-2010-09/33},
  year         = {2011},
}