arXiv 1808.048972018-08hep-ph

Non-Global and Clustering Effects for Groomed Multi-Prong Jet Shapes

Duff Neill

备注：: v2, 16 pgs., 7 figs. References added, introduction expanded, discussion of sources of NGLs in x-sec expanded, added plots of shower cutoff dependence and statistical uncertainties. version accepted for publication
DOI：: 10.1007/JHEP02(2019)114

英文摘要：

We present a resummation valid to next-to leading logarithmic accuracy of the non-global and clustering effects in groomed (with modified mass drop tagger) multi-pronged observables. These effects are universal in the sense that they depend only on the flavor structure of the $1\to 2$ splitting forming the multi-pronged subjets and the opening angle of the splitting, being insensitive to the underlying hard process or underlying event. The differential spectra with and without the non-global and clustering effects are presented, and the change in the spectra is found to be small.

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

Factorization and Resummation for Groomed Multi-Prong Jet Shapes

Observables which distinguish boosted topologies from QCD jets are playing an increasingly important role at the Large Hadron Collider (LHC). These observables are often used in conjunction with jet grooming algorithms, which reduce contamination from both theoretical and experimental sources. In this paper we derive factorization formulae for groomed multi-prong substructure observables, focusing in particular on the groomed $D_2$ observable, which is used to identify boosted hadronic decays of electroweak bosons at the LHC. Our factorization formulae allow systematically improvable calculati…

2017-09-29hep-exhep-phnucl-th

Groomed jets in heavy-ion collisions: sensitivity to medium-induced bremsstrahlung

We argue that contemporary jet substructure techniques might facilitate a more direct measurement of hard medium-induced gluon bremsstrahlung in heavy-ion collisions, and focus specifically on the "soft drop declustering" procedure that singles out the two leading jet substructures. Assuming coherent jet energy loss, we find an enhancement of the distribution of the energy fractions shared by the two substructures at small subjet energy caused by hard medium-induced gluon radiation. Departures from this approximation are discussed, in particular, the effects of colour decoherence and the conta…

2016-10-27hep-phnucl-th

修饰喷注观测量的QCD重求和：NNLL+NLO精度

QCD resummation for groomed jet observables at NNLL+NLO

本文对使用Soft Drop β=0修饰的喷注观测量进行NNLL重求和，将NNLL项分为简化包含性标记器和C/A聚类修正两类，首次给出修饰喷注角度的NNLL+NLO预言，并同时纳入有限z_cut的NLL效应，结果对过程无关，可推广至强子对撞机。

2023-10-27hep-ph

从下到上方法描述重离子碰撞中的 grooming 介子数据

Bottom-up approach to describe groomed jet data in heavy-ion collisions

LIP（卢瑟福·阿普尔顿实验室）

本文提出了一种从下到上的方法，通过将介质效应视为有效能量位移，计算groomed子结构可观测量，并在多种可观测量上实现了理论与数据的一致性。

2026-01-19hep-exhep-phnucl-th

重子反冲对γ标记喷流中软滴 grooming � observable 的影响：多阶段方法

The effect of recoils on soft-drop-groomed observables in $γ$-tagged jets in a multistage approach

Akita International University（秋田国际大学）；Duke University（杜克大学）；Wayne State University（韦恩州立大学）；Lawrence Livermore National Laboratory（劳伦斯利弗莫尔国家实验室）；Vanderbilt University（范德堡大学）；Massachusetts Institute of Technology（麻省理工学院）；McGill University（麦吉尔大学）；University of California, Berkeley（加州大学伯克利分校）；Lawrence Berkeley National Laboratory（劳伦斯伯克利国家实验室）

研究通过多阶段方法探讨了反冲对γ标记喷流中软滴groomed observable 的影响，发现夸克喷流在某些observable中表现出非单调修改，揭示了介质诱导结构变化的信号，并强调了喷流-介质相互作用研究的潜力。

2026-03-13hep-phnucl-exnucl-th

Vetoed jet clustering: The mass-jump algorithm

A new class of jet clustering algorithms is introduced. A criterion inspired by successful mass-drop taggers is applied that prevents the recombination of two hard prongs if their combined jet mass is substantially larger than the masses of the separate prongs. This "mass jump" veto effectively results in jets with variable radii in dense environments. Differences to existing methods are investigated. It is shown for boosted top quarks that the new algorithm has beneficial properties which can lead to improved tagging purity.

2015-04-23hep-ph

更多相关论文收起更多论文

Factorization for groomed jet substructure beyond the next-to-leading logarithm

Jet grooming algorithms are widely used in experimental analyses at hadron colliders to remove contaminating radiation from within jets. While the algorithms perform a great service to the experiments, their intricate algorithmic structure and multiple parameters has frustrated precision theoretic understanding. In this paper, we demonstrate that one particular groomer called soft drop actually makes precision jet substructure easier. In particular, we derive a factorization formula for a large class of soft drop jet substructure observables, including jet mass. The essential observation that …

2016-07-11hep-ph

The soft drop groomed jet radius at NLL

We present results for the soft drop groomed jet radius $R_g$ at next-to-leading logarithmic accuracy. The radius of a groomed jet which corresponds to the angle between the two branches passing the soft drop criterion is one of the characteristic observables relevant for the precise understanding of groomed jet substructure. We establish a factorization formalism that allows for the resummation of all relevant large logarithms, which is based on demonstrating the all order equivalence to a jet veto in the region between the boundaries of the groomed and ungroomed jet. Non-global logarithms in…

2019-08-05hep-exhep-phnucl-ex

Jet splitting functions in the vacuum and in a QCD medium

The two-prong structure related to the leading subjets inside a reconstructed jet opens new avenues toward precision constraints on the in-medium modification of parton showers. In this talk, we present the first resummed calculation of the soft-dropped groomed momentum sharing distribution, or the jet splitting function, in heavy-ion collisions for both light jets and heavy flavor tagged jets. Existing light jet splitting function data from the STAR experiment at RHIC and the CMS experiment at LHC can be understood in the unified framework of soft-collinear effective theory with Glauber gluon…

2018-12-08hep-ph

Jet shapes for boosted jet two-prong decays from first-principles

Several boosted jet techniques use jet shape variables to discriminate the multi-pronged signal from Quantum Chromodynamics backgrounds. In this paper, we provide a first-principles study of an important class of jet shapes all of which put a constraint on the subjet mass: the mass-drop parameter ($μ^2$), the $N$-subjettiness ratio ($τ_{21}^{(β=2)}$) and energy correlation functions ($C_2^{(β=2)}$ or $D_2^{(β=2)}$). We provide analytic results both for QCD background jets as well as for signal processes. We further study the situation where cuts on these variables are applied recursively with …

2016-09-22hep-exhep-ph

由喷注叉状结构辅助的精简喷注标记网络

Streamlined jet tagging network assisted by jet prong structure

提出基于MLP mixer和子喷注信息交叉注意力的新型喷注分类网络，在保持与先进模型相当性能的同时大幅提升计算效率，并通过可解释方法验证其有效性。

2024-06-03hep-ph

Searching for the dead cone effects with iterative declustering of heavy-flavor jets

We present a new method to expose the dead cone effect at colliders using iterative declustering techniques. Iterative declustering allows to unwind the jet clustering and to access the subjets or branches at different depths of the jet tree. Our method consists on declustering the heavy flavour-tagged jet using Cambridge-Achen algorithm following the branch containing the heavy flavour at each step and registering the kinematics of the complementary untagged prong. The kinematics of the complementary untagged prong fill a Lund map representing the gluon radiation off the heavy flavour quark a…

2020-06-21hep-ph

Jets from Jets: Re-clustering as a tool for large radius jet reconstruction and grooming at the LHC

Jets with a large radius $R\gtrsim 1$ and grooming algorithms are widely used to fully capture the decay products of boosted heavy particles at the Large Hadron Collider (LHC). Unlike most discriminating variables used in such studies, the jet radius is usually not optimized for specific physics scenarios. This is because every jet configuration must be calibrated, insitu, to account for detector response and other experimental effects. One solution to enhance the availability of large-$R$ jet configurations used by the LHC experiments is {\it jet re-clustering}. Jet re-clustering introduces a…

2014-12-11hep-ph

Jet energy drop

We study the jet energy drop, which is the relative difference between the groomed and ungroomed jet energy or transverse momentum. It is one of the fundamental quantities that characterizes the impact of grooming on jets produced in high energy collisions. We consider three different grooming algorithms i) soft drop, ii) iterated soft drop, and iii) trimming. We carry out the resummation of large logarithms of the jet energy drop, the jet radius as well as relevant grooming parameters at next-to-leading logarithmic (NLL$'$) accuracy. In addition, we account for non-global and clustering logar…

2022-02-14hep-ph

Jet SIFT-ing：一种面向子结构时代的新型尺度不变喷注聚类算法

Jet SIFT-ing: a new scale-invariant jet clustering algorithm for the substructure era

本研究提出新型尺度不变喷注聚类算法SIFT，结合kT与anti-kT特性，内置滤波与可变半径隔离机制，可在大boost下保持子结构分辨率，在宽横向能量范围实现多prong共振态的优异识别与重建，助力喷注子结构研究。

2023-02-16hep-ph

在HERA深度非弹性电子-质子散射中修饰事件形状观测量的测量

Measurement of groomed event shape observables in deep-inelastic electron-proton scattering at HERA

本文首次在HERA深度非弹性散射数据中应用修饰技术，利用Centauro算法测量修饰事件形状观测量，并与理论计算进行比较。

2024-08-01hep-exhep-phnucl-ex