A new model for hadronization and e+e− annihilation

Gottschalk, Thomas D.; Morris, Duncan A.

doi:10.1016/0550-3213(87)90236-7

Cited by 48 publications

(13 citation statements)

References 67 publications

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“…It is instructive to note that the negative-sign (13) and (24) dipoles of eq. (33) in fact act to increase the magnitude of the string-like anisotropy effects of the (14) and (23) dipoles.…”

Section: Structure Of Inclusive Particle Flow In W-pair Eventsmentioning

confidence: 99%

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On colour rearrangement in hadronicW +W− evemts

Sjöstrand

Хозе

1994

Z. Phys. C - Particles and Fields

158

196

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We discuss the possibility of colour rearrangement in e + e − → W + W − → q 1 q 2 q 3 q 4 events, i.e. that the original colour singlets q 1 q 2 and q 3 q 4 may be transmuted, for instance, into new singlets q 1 q 4 and q 3 q 2. 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 separate times after 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 α 2 s 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.

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Section: Structure Of Inclusive Particle Flow In W-pair Eventsmentioning

confidence: 99%

“…One way out is to relax the mass constraint, by having the string break into variable-mass clusters rather than fixed-mass hadrons. This is the approach taken in the CALTECH-II model [23]. However, it was never possible to achieve a good agreement with data for CALTECH-II.…”

Section: Relevant Features Of String Fragmentationmentioning

confidence: 99%

On colour rearrangement in hadronicW +W− evemts

Sjöstrand

Хозе

1994

Z. Phys. C - Particles and Fields

158

196

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“…The Caltech-II model [29] employs features of both string and cluster models. The model begins with the generation of an LLA parton shower.…”

Section: The Caltech-ii Modelmentioning

confidence: 99%

“…Comparisons of various measured quantities with the predictions of several hadronization models (Lund [6, 55-57, 67], Webber [28], Caltech-II [29] and UCLA [27]) are shown in figures 7.5 through 7.15. Each Monte Carlo data set is based on 300,000 events, except for that of the UCLA model which is has only 100,000 events.…”

Section: 3mentioning

confidence: 99%

Inclusive. pi. /sup + -/, K/sup + -/, and p, anti p production in e/sup +/e/sup -/ annihilation at. sqrt. s = 29 GeV

Cowan¹

1988

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“…The results are compared with distributions generated by QCD+fragmentation model programs via Monte Carlo techniques such as the leading-logarithmic parton shower (Lund PS) [45], the second-order matrix-element calculation (Lund ME) [46], and the model of the Gottschalk and Morris (CALTECH II) [47] at the parton level. The main approach of all these programs is utilizing a model with a few free parameters in the fitting to the data processes.…”

Section: Introductionmentioning

confidence: 99%

Applying different angular ordering constraints and $k_t$-factorization approaches to the single inclusive hadron production in the $e^+e^-$ annihilation processes

Modarres,

Taghavi

2021

Preprint

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We study the differential cross section of the single inclusive e + e − annihilation to the hadrons via γ-production, in the different k t -factorization frameworks. In order to take into account the transverse momenta of the incoming partons, for the first time, we apply the Kimber et al (KMR) method to calculate the unintegrated parton fragmentation functions (UFFs) from the ordinary integrated one, i.e., the parton fragmentation functions (FFs), which satisfy the similar DGLAP evolution equations, such as those of parton distribution functions (PDFs). Also, by utilizing the different angular ordering constraints the results corresponding to the Martin et al (MRW) in the leading order (LO) and the next-to-leading-order (NLO) are obtained. The LO sets of DSS library for the input FFs is used. The numerical results are compared with the experimental data in the different energies which are reported by the different collaborations, such as TASSO, AMY, MARK II, CELLO, DELPHI, SLD, ALEPH and Belle with the other QCD+fragmentation models such as Pythia 6.4 and 8.2 parton showers. The behaviors of the normalized differential cross sections and the multiplicity versus the "transverse momentum" (p ⊥ ) are discussed. The final results demonstrate that the KMR and MRW UFFs give a good description of data and there is not much significant difference between the above three schemes. On the other hand, our results become closer to the data for the lower values of p ⊥ and the higher values of center of mass energies.

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A new model for hadronization and e+e− annihilation

Cited by 48 publications

References 67 publications

On colour rearrangement in hadronicW +W− evemts

On colour rearrangement in hadronicW +W− evemts

Inclusive. pi. /sup + -/, K/sup + -/, and p, anti p production in e/sup +/e/sup -/ annihilation at. sqrt. s = 29 GeV

Applying different angular ordering constraints and $k_t$-factorization approaches to the single inclusive hadron production in the $e^+e^-$ annihilation processes

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