arXiv 0801.40282008-01hep-ph

GenEvA (II): A phase space generator from a reweighted parton shower

Christian W. Bauer, Frank J. Tackmann, Jesse Thaler

备注：: 54 pages, 20 figures, v2: corrected typos, added references
发表信息：: JHEP0812:011,2008
DOI：: 10.1088/1126-6708/2008/12/011

英文摘要：

We introduce a new efficient algorithm for phase space generation. A parton shower is used to distribute events across all of multiplicity, flavor, and phase space, and these events can then be reweighted to any desired analytic distribution. To verify this method, we reproduce the e+e- -> n jets tree-level result of traditional matrix element tools. We also show how to improve tree-level matrix elements automatically with leading-logarithmic resummation. This algorithm is particularly useful in the context of a new framework for event generation called GenEvA. In a companion paper [arXiv:0801.4026], we show how the GenEvA framework can address contemporary issues in event generation.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

阅读原文

阅读 PDF ↗

arXiv 页面 ↗HTML 原文 ↗

本文内容

英文摘要相关论文

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

继续探索

相关论文

Combining Higher-Order Resummation with Multiple NLO Calculations and Parton Showers in the GENEVA Monte Carlo Framework

We discuss the GENEVA Monte Carlo framework, which combines higher-order resummation (NNLL) of large Sudakov logarithms with multiple next-to-leading-order (NLO) matrix-element corrections and parton showering (using PYTHIA8) to give a complete description at the next higher perturbative accuracy in alpha_s at both small and large jet resolution scales. Results for e+e- -> jets compared to LEP data and for Drell-Yan production are presented.

2013-05-22hep-ph

Higgsstrahlung at NNLL$'+$NNLO Matched to Parton Showers in GENEVA

We present results for the Higgsstrahlung process within the GENEVA Monte Carlo framework. We combine the fully differential NNLO calculation with the higher-order resummation in the 0-jettiness resolution variable (beam-thrust). The resulting parton-level events are further showered and hadronised by Pythia8. The beam-thrust resummation is carried out to NNLL$'$ accuracy, which consistently incorporates all singular virtual and real NNLO corrections. It thus provides a natural perturbative connection between the NNLO calculation and the parton shower regime, including a systematic assessment …

2019-10-01hep-exhep-ph

在GENEVA中 interfaced 到部分子簇射的双Higgs产生在NNLO

Double Higgs production at NNLO interfaced to parton showers in GENEVA

本研究在GENEVA框架中，于重顶极限近似下，实现了匹配到部分子簇射的NNLO QCD双Higgs产生，重求和零喷注度大对数至N3LL精度，并扩展簇射接口支持Pythia8、Dire和Sherpa以研究大动量转移下的匹配效应。

2023-06-30hep-exhep-ph

Precise predictions for photon pair production matched to parton showers in GENEVA

We present a new calculation for the production of isolated photon pairs at the LHC with NNLL$'_{\mathcal{T}_0}$+NNLO accuracy. This is the first implementation within the GENEVA Monte Carlo framework of a process with a nontrivial Born-level definition which suffers from QED singularities. Throughout the computation we use a smooth-cone isolation algorithm to remove such divergences. The higher-order resummation of the 0-jettiness resolution variable $\mathcal{T}_0$ is based on a factorisation formula derived within Soft-Collinear Effective Theory which predicts all of the singular, virtual a…

2021-03-08hep-exhep-ph

在 GENEVA 中利用 N$^3$LL 色单态横动量重求和将 NNLO 与部分子簇射匹配

Matching NNLO to parton shower using N$^3$LL colour-singlet transverse momentum resummation in GENEVA

本文扩展 GENEVA，以色单态横动量为分辨率变量实现 N$^3$LL 重求和与 NNLO 加部分子簇射匹配，并在 Drell-Yan 过程中验证其与 LHC 数据符合良好。

2024-05-10hep-exhep-ph

Combining Higher-Order Resummation with Multiple NLO Calculations and Parton Showers in GENEVA

We extend the lowest-order matching of tree-level matrix elements with parton showers to give a complete description at the next higher perturbative accuracy in alpha_s at both small and large jet resolutions, which has not been achieved so far. This requires the combination of the higher-order resummation of large Sudakov logarithms at small values of the jet resolution variable with the full next-to-leading order (NLO) matrix-element corrections at large values. As a by-product this combination naturally leads to a smooth connection of the NLO calculations for different jet multiplicities. I…

2013-10-06hep-exhep-ph

更多相关论文收起更多论文

Underlying event sensitive observables in Drell-Yan production using GENEVA

We present an extension of the GENEVA Monte Carlo framework to include multiple parton interactions (MPI) provided by PYTHIA8. This allows us to obtain predictions for underlying-event sensitive measurements in Drell-Yan production, in conjunction with GENEVA's fully-differential NNLO calculation, NNLL' resummation for the 0-jet resolution variable (beam thrust), and NLL resummation for the 1-jet resolution variable. We describe the interface with the parton shower algorithm and MPI model of PYTHIA8, which preserves both the precision of partonic N-jet cross sections in GENEVA as well as the s…

2017-03-14hep-exhep-ph

GenEvA (I): A new framework for event generation

We show how many contemporary issues in event generation can be recast in terms of partonic calculations with a matching scale. This framework is called GenEvA, and a key ingredient is a new notion of phase space which avoids the problem of phase space double-counting by construction and includes a built-in definition of a matching scale. This matching scale can be used to smoothly merge any partonic calculation with a parton shower. The best partonic calculation for a given region of phase space can be determined through physics considerations alone, independent of the algorithmic details of …

2008-09-05hep-ph

Next-to-next-to-leading order event generation for $Z$ boson pair production matched to parton shower

We present a novel next-to-next-to-leading order (NNLO) QCD calculation matched to parton shower for the production of a pair of $Z$ bosons decaying to four massless leptons, $p p \to \ell^+ \ell^- \ell'^+ \ell'^- + X$, at the LHC. Spin correlations, interferences and off-shell effects are included throughout. Our result is based on the resummed beam-thrust spectrum, which we evaluate at next-to-next-to-leading-logarithmic (NNLL$'_{\mathcal{T}_0}$) accuracy for the first time for this process, and makes use of the GENEVA Monte Carlo framework for the matching to PYTHIA8 shower and hadronisatio…

2021-04-09hep-exhep-ph

Drell-Yan Production at NNLL'+NNLO Matched to Parton Showers

We present results for Drell-Yan production from the GENEVA Monte-Carlo framework. We combine the fully-differential NNLO calculation with higher-order resummation in the 0-jettiness resolution variable. The resulting parton-level events are further combined with parton showering and hadronization provided by PYTHIA8. The 0-jettiness resummation is carried out to NNLL', which consistently incorporates all singular virtual and real NNLO corrections. It thus provides a natural perturbative connection between the NNLO calculation and the parton shower regime, including a systematic assessment of …

2015-08-06hep-exhep-ph

采用NNLL'精度下喷注否决重求和的NNLO+PS $W^+W^-$产生过程研究

NNLO+PS $W^+W^-$ production using jet veto resummation at NNLL$'$

本研究构建了首个以最硬喷注横动量为分辨率变量的NNLO+PS精度W玻色子对产生事件产生器，基于GENEVA方法匹配固定阶计算与部分子簇射，验证后与ATLAS、CMS实验数据吻合良好。

2023-08-22hep-exhep-ph

利用高能电弱修正改进NLO QCD事例产生器

Improving NLO QCD event generators with high-energy EW corrections

本研究提出一种将高能电弱苏达科夫对数修正与NLO+PS QDC预测结合的新方法，通过重加权NLO+PS事例实现，已在MadGraph5_aMC@NLO框架自动化实现，可用于多种强子产生过程并给出相关物理分布结果。

2024-05-22hep-exhep-ph