Momentum conservation and unitarity in parton showers and NLL resummation

doi:10.1007/jhep01(2018)118

Title: Momentum conservation and unitarity in parton showers and NLL resummation

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We present a systematic study of differences between NLL resummation and parton showers. We first construct a Markovian Monte-Carlo algorithm for resummation of additive observables in electron-positron annihilation. Approximations intrinsic to the pure NLL result are then removed, in order to obtain a traditional, momentum and probability conserving parton shower based on the coherent branching formalism. The impact of each approximation is studied, and an overall comparison is made between the parton shower and pure NLL resummation. Differences compared to modern parton-shower algorithms formulated in terms of color dipoles are analyzed.

Authors:

; Reichelt, Daniel ^[2] ; Siegert, Frank ^[2]

SLAC National Accelerator Lab., Menlo Park, CA (United States)
TU Dresden (Germany). Inst. of Nuclear and Particle Physics

Publication Date:: 2018-01-23

Grant/Contract Number:: AC02-76SF00515; SI 2009/1-1

Type:: Accepted Manuscript

Journal Name:: Journal of High Energy Physics (Online)

Additional Journal Information:: Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2018; Journal Issue: 1; Journal ID: ISSN 1029-8479

Publisher:: Springer Berlin

Research Org:: SLAC National Accelerator Lab., Menlo Park, CA (United States); TU Dresden (Germany)

Sponsoring Org:: USDOE; German Academic Exchange Service (DAAD); German Research Foundation (DFG)

Country of Publication:: United States

Language:: English

Subject:: 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; QCD phenomenology

OSTI Identifier:: 1425581


                    Höche, Stefan, Reichelt, Daniel, and Siegert, Frank. Momentum conservation and unitarity in parton showers and NLL resummation.  United States: N. p.,  
        Web.  doi:10.1007/jhep01(2018)118.

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                    Höche, Stefan, Reichelt, Daniel, & Siegert, Frank. Momentum conservation and unitarity in parton showers and NLL resummation.  United States.  doi:10.1007/jhep01(2018)118.

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                    Höche, Stefan, Reichelt, Daniel, and Siegert, Frank. 2018.  
        "Momentum conservation and unitarity in parton showers and NLL resummation".  United States.  
        doi:10.1007/jhep01(2018)118.  https://www.osti.gov/servlets/purl/1425581.

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@article{osti_1425581,

  title        = {Momentum conservation and unitarity in parton showers and NLL resummation},

  author       = {Höche, Stefan and Reichelt, Daniel and Siegert, Frank},

  abstractNote = {We present a systematic study of differences between NLL resummation and parton showers. We first construct a Markovian Monte-Carlo algorithm for resummation of additive observables in electron-positron annihilation. Approximations intrinsic to the pure NLL result are then removed, in order to obtain a traditional, momentum and probability conserving parton shower based on the coherent branching formalism. The impact of each approximation is studied, and an overall comparison is made between the parton shower and pure NLL resummation. Differences compared to modern parton-shower algorithms formulated in terms of color dipoles are analyzed.},

  doi          = {10.1007/jhep01(2018)118},

  journal      = {Journal of High Energy Physics (Online)},

  number       = 1,

  volume       = 2018,

  place        = {United States},

  year         = {2018},

  month        = {1}

}

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10.1007/jhep01(2018)118
https://doi.org/10.1007/jhep01(2018)118

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Title: Momentum conservation and unitarity in parton showers and NLL resummation

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