Momentum conservation and unitarity in parton showers and NLL resummation

Höche, Stefan; Reichelt, Daniel; Siegert, Frank

doi:10.1007/jhep01(2018)118

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

Journal Article · Tue Jan 23 00:00:00 EST 2018 · Journal of High Energy Physics (Online)

DOI:https://doi.org/10.1007/jhep01(2018)118· OSTI ID:1425581

^[1]; Reichelt, Daniel ^[2]; Siegert, Frank ^[2]

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

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.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Technische Universität Dresden (Germany)

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

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

OSTI ID:: 1425581

Journal Information:: Journal of High Energy Physics (Online), Vol. 2018, Issue 1; ISSN 1029-8479

Publisher:: Springer BerlinCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 20 works

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