On colour rearrangement in hadronic W+W- evemts
Sjöstrand, Torbjörn LU
and Khoze, Valery A.
(1994)
In Zeitschrift für Physik C Particles and Fields
62(2).
p.281-309
- Abstract
We discuss the possibility of colour rearrangement in {Mathematical expression} events, i.e that the original colour singlets {Mathematical expression} and {Mathematical expression} may be transmuted, for instance, into new singlets {Mathematical expression} and {Mathematical expression}. The effects on event properties could be quite large if such a rearrangement would occur instantaneously, so that gluon emission would be restricted to each of the new singlets separately. We argue that such a scenario is unlikely for two reasons. Firstly, the W+ and W- usually decay at separately. We argue that such a scenario is unlikely for two reasons. Firstly, the W+W- production, which leads to large... (More)
We discuss the possibility of colour rearrangement in {Mathematical expression} events, i.e that the original colour singlets {Mathematical expression} and {Mathematical expression} may be transmuted, for instance, into new singlets {Mathematical expression} and {Mathematical expression}. The effects on event properties could be quite large if such a rearrangement would occur instantaneously, so that gluon emission would be restricted to each of the new singlets separately. We argue that such a scenario is unlikely for two reasons. Firstly, the W+ and W- usually decay at separately. We argue that such a scenario is unlikely for two reasons. Firstly, the W+W- production, which leads to large relative phases for energetic radiation off the two constituents of a rearranged system, and a corresponding dampening of the QCD cascades. Secondly, within the perturbative scenario the colour transmutation appears only in order αs2 and is colour-suppressed. Colour reconnection at longer time scales is quite feasible, however, and may affect the fragmentation phase. If so, the nature of non-perturbative QCD can be probed in a new way. We formulate several alternative toy models and use these to estimate the colour reconnection probability as a function of the event kinematics. Possible consequences for LEP 2 events are illustrated, with special attention to systematic errors in W mass determinations.
(Less)
- author
- Sjöstrand, Torbjörn
LU
and Khoze, Valery A.
- publishing date
- 1994-06-01
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Zeitschrift für Physik C Particles and Fields
- volume
- 62
- issue
- 2
- pages
- 29 pages
- publisher
- Springer
- external identifiers
-
- scopus:34249765268
- ISSN
- 0170-9739
- DOI
- 10.1007/BF01560244
- language
- English
- LU publication?
- no
- id
- f2e578f8-197e-44ec-9d28-1d441b0c56a0
- date added to LUP
- 2019-05-02 21:54:31
- date last changed
- 2021-01-03 09:58:26
@article{f2e578f8-197e-44ec-9d28-1d441b0c56a0,
abstract = {{<p>We discuss the possibility of colour rearrangement in {Mathematical expression} events, i.e that the original colour singlets {Mathematical expression} and {Mathematical expression} may be transmuted, for instance, into new singlets {Mathematical expression} and {Mathematical expression}. The effects on event properties could be quite large if such a rearrangement would occur instantaneously, so that gluon emission would be restricted to each of the new singlets separately. We argue that such a scenario is unlikely for two reasons. Firstly, the W<sup>+</sup> and W<sup>-</sup> usually decay at separately. We argue that such a scenario is unlikely for two reasons. Firstly, the W<sup>+</sup>W<sup>-</sup> production, which leads to large relative phases for energetic radiation off the two constituents of a rearranged system, and a corresponding dampening of the QCD cascades. Secondly, within the perturbative scenario the colour transmutation appears only in order α<sub>s</sub><sup>2</sup> and is colour-suppressed. Colour reconnection at longer time scales is quite feasible, however, and may affect the fragmentation phase. If so, the nature of non-perturbative QCD can be probed in a new way. We formulate several alternative toy models and use these to estimate the colour reconnection probability as a function of the event kinematics. Possible consequences for LEP 2 events are illustrated, with special attention to systematic errors in W mass determinations.</p>}},
author = {{Sjöstrand, Torbjörn and Khoze, Valery A.}},
issn = {{0170-9739}},
language = {{eng}},
month = {{06}},
number = {{2}},
pages = {{281--309}},
publisher = {{Springer}},
series = {{Zeitschrift für Physik C Particles and Fields}},
title = {{On colour rearrangement in hadronic W<sup>+</sup>W<sup>-</sup> evemts}},
url = {{http://dx.doi.org/10.1007/BF01560244}},
doi = {{10.1007/BF01560244}},
volume = {{62}},
year = {{1994}},
}