Adam Kardos, Andrew J. Larkoski, Zoltán Trócsányi
We present predictions of the distribution of groomed heavy jet mass in electron-positron collisions at the next-to-next-to-leading order accuracy matched with the resummation of large logarithms to next-to-next-to-next-to-leading logarithmic accuracy. Resummation at this accuracy is possible through extraction of necessary two-loop constants and three-loop anomalous dimensions from fixed-order codes.
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We discuss the status of resummation of large logarithmic contributions to groomed event shapes of hadronic final states in electron-positron annihilation. We identify the missing ingredients needed for next-to-next-to-next-to-leading logarithmic (NNNLL) resummation of the mMDT groomed jet mass in $e^+e^-$ collisions: the low-scale collinear-soft constants at two-loop accuracy, $c_{S_c}^{(2)}$, and the three-loop non-cusp anomalous dimension of the global soft function, $γ_S^{(2)}$. We present a method for extracting those constants using fixed-order codes: the EVENT2 program to obtain the col…
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…
We consider the factorized groomed jet mass distribution in inclusive jet processes using modified mass drop tagger (mMDT), corresponding to soft drop with the angular exponent $β=0$. A grooming procedure is implemented rather than tagging in the sense that grooming always returns a groomed jet, while tagging dose not return a jet when a single particle remains after tagging. We find that the grooming procedure makes the jet mass distribution infrared safe and only ultraviolet divergences appear in each factorized part. The groomed jet mass distributions are investigated in a wide range of the…
We study jet mass distributions measured in the single inclusive jet production in proton-proton collisions $pp\to \text{jet}+X$ at the LHC. We consider both standard ungroomed jets as well as soft drop groomed jets. Within the Soft Collinear Effective Theory (SCET), we establish QCD factorization theorems for both cases and we study their relation. The developed framework allows for the joint resummation of several classes of logarithmic corrections to all orders in the strong coupling constant. For the ungroomed case, we resum logarithms in the jet radius parameter and in the small jet mass.…
We study the link between parton dynamics in the collinear limit and the logarithmically enhanced terms of the groomed jet mass distribution, for jets groomed with the modified mass-drop tagger (mMDT). While the leading-logarithmic (LL) result is linked to collinear evolution with leading-order splitting kernels, here we derive the NLL structure directly from triple-collinear splitting kernels. The calculation we present is a fixed-order calculation in the triple-collinear limit, independent of resummation ingredients and methods. It therefore constitutes a powerful cross-check of the NLL resu…
We present the transverse momentum spectrum of groomed jets in di-jet events for $e^+e^-$ collisions and semi-inclusive deep inelastic scattering (SIDIS). The jets are groomed using a soft-drop grooming algorithm which helps in mitigating effects of non-global logarithms and underlying event. At the same time, by reducing the final state hadronization effects, it provides a clean access to the non-perturbative part of the evolution of transverse momentum dependent (TMD) distributions. In SIDIS experiments we look at the transverse momentum of the groomed jet measured w.r.t. the incoming hadron…
The Catchment Area of Groomed Jets at NNLL
本文在NNLL精度下计算了软drop修整喷注半径的集水区矩，并与蒙特卡罗模拟验证一致，为强耦合常数和顶夸克质量测定等精密物理应用提供了关键理论输入。
Precision calculations for groomed event shapes at HERA
本文为 HERA 中性流深度非弹性散射中的软-drop 修饰不变质量事件形状提供了重求和与匹配预言，并通过 SHERPA 模拟的转移矩阵纳入强子化非微扰修正及其不确定性。
Jet grooming has emerged as a necessary and powerful tool in a precision jet physics program. In this paper, we present three results on jet grooming in perturbation theory, focusing on heavy jet mass in $e^+e^-\to$ hadrons collisions, groomed with the modified mass drop tagger. First, we calculate the analytic cross section at leading-order. Second, using the leading-order result and numerical results through next-to-next-to-leading order, we show that cusps in the distribution on the interior of phase space at leading-order are softened at higher orders. Finally, using analytic and numerical…
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…
Measurements of jet substructure in heavy-ion collisions may provide key insight to the nature of jet quenching in the quark-gluon plasma. Jet grooming techniques from high-energy physics have been applied to heavy-ion collisions in order to isolate theoretically controlled jet observables and explore possible modification to the hard substructure of jets. However, the grooming algorithms used have not been tailored to the unique considerations of heavy-ion collisions, in particular to the experimental challenge of reconstructing jets in the presence of a large underlying event. We report a se…
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.
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。
For the "stealth bosons" $S$, light boosted particles with a decay $S \to A A \to q \bar q q \bar q$ into four quarks and reconstructed as a single fat jet, the groomed jet mass has a strong correlation with groomed jet substructure variables. Consequently, the jet mass distribution is strongly affected by the jet substructure selection cuts when applied on the groomed jet. We illustrate this fact by recasting a CMS search for low-mass dijet resonances and show a few representative examples. The mass distributions exhibit narrow and wide bumps at several locations in the 100 - 300 GeV range, b…
Jet angularities are a class of jet substructure observables where a continuous parameter is introduced in order to interpolate between different classic observables such as the jet mass and jet broadening. We consider jet angularities measured on an inclusive jet sample at the LHC where the soft drop grooming procedure is applied in order to remove soft contaminations from the jets. The soft drop algorithm allows for a precise comparison between theory and data and could be used to extract the QCD strong coupling constant $α_s$ from jet substructure data in the future. We develop a framework …
Bottom-up approach to describe groomed jet data in heavy-ion collisions
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。
We develop a factorization framework to compute the double differential cross section in soft drop groomed jet mass and groomed jet radius. We describe the effective theories in the large, intermediate, and small groomed jet radius regions defined by the interplay of the jet mass and the groomed jet radius measurement. As an application we present the NLL$'$ results for the perturbative moments that are related to the coefficients $C_1$ and $C_2$ that specify the leading hadronization corrections up to three universal parameters. We compare our results with Monte Carlo simulations and a calcul…
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 …
We propose an observable which involves measuring the properties (transverse momentum $p_{h\perp}$ and energy fraction $z_h$) of an identified hadron inside a groomed jet. The jet is identified with an anti-kT/CA algorithm and is groomed by implementing the modified mass drop procedure with an energy cut-off parameter $z_{cut}$. The transverse momentum of the hadron inside the jet is measured with respect to the groomed jet axis. We obtain a factorization theorem in the framework of Soft Collinear Effective Theory (SCET), to define a Transverse Momentum Dependent Fragmenting Jet Function (TMDF…
(N)NLO+NLL' accurate predictions for plain and groomed 1-jettiness in neutral current DIS
本文针对中性流 DIS 的普通及 soft-drop 修饰 1-jettiness，给出 (N)NLO+NLL' 重求和匹配预测，并用 Sherpa 强子化修正与独立模拟验证一致性。
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…
Jet grooming has emerged as a necessary and vital tool for mitigating contamination radiation in jets. The additional restrictions on emissions imposed by the groomer can result in non-smooth behavior of resulting fixed-order distributions of observables measured on groomed jets. As a concrete example, we study the cusp in the hemisphere mass distribution of $e^+e^-\to$ hadrons events groomed with soft drop. We identify the leading emissions that contribute in the region about the cusp and formulate an all-orders factorization theorem that describes how the cusp is resolved through arbitrary s…
We present the transverse momentum spectrum for a heavy hadron at threshold in a groomed jet initiated by a heavy quark. The cross section is doubly differential in the energy fraction of an identified heavy hadron in the jet and its transverse momentum measured with respect to the groomed (recoil free) jet axis. The grooming is implemented using a soft-drop grooming algorithm and helps us in mitigating the effects of Non-Global logarithms and pile up. For the particular case of a $B$ meson, we identify two distinct regimes of the transverse momentum spectrum and develop an EFT within the form…
We explore the ability of a recently proposed jet substructure technique, Dynamical Grooming, to pin down the properties of the Quark-Gluon Plasma formed in ultra-relativistic heavy-ion collisions. In particular, we compute, both analytically and via Monte-Carlo simulations, the opening angle $θ_g$ of the hardest splitting in the jet as defined by Dynamical Grooming. Our calculation, grounded in perturbative QCD, accounts for the factorization in time between vacuum-like and medium-induced processes in the double logarithmic approximation. We observe that the dominating scale in the $θ_g$-dist…
We investigate the medium modifications of momentum splitting fraction and groomed jet radius with both dynamical grooming and soft drop algorithms in heavy-ion collisions. In the calculation, the partonic spectrum of initial hard scattering in p+p collisions is provided by the event generator PYTHIA 8, and the energy loss of fast parton traversing in a hot/dense QCD medium is simulated with the Linear Boltzmann Transport (LBT) model. We predict the normalized distributions of the groomed jet radius $θ_g$ and momentum splitting fraction $z_g$ with the dynamical grooming algorithm in Pb+Pb coll…
We study the angle between i) the standard jet axis, ii) the axis of a jet which has been groomed using soft drop, with reduced sensitivity to soft radiation, iii) the jet axis obtained with the winner-take-all recombination scheme, which is insensitive to soft radiation at leading power. We calculate the distributions for these angles at next-to-leading logarithmic accuracy, including non-global logarithms. The angle between the standard and groomed jet axis directly probes soft wide-angle radiation, leading to a novel factorization formula. This angle is also very sensitive to nonperturbativ…
We develop an effective field theory (EFT) framework to perform an analytic calculation for energy correlator observables computed on groomed heavy-quark jets. A soft-drop grooming algorithm is applied to a jet initiated by a massive quark to minimize soft contamination effects such as pile-up and multi-parton interactions. We specifically consider the two-particle energy correlator as an initial application of this EFT framework to compute heavy quark jet substructure. We find that there are different regimes for the event shapes, depending on the size of the measured correlator observable, t…
Collinear fragmentation at NNLL: generating functionals, groomed correlators and angularities
本研究以构建NNLL部分子簇射为目标，利用生成泛函计算了胶子喷注共线碎裂的Sudakov形式，推导出两圈反常维度$B_2(z)$，为扩展喷注微积分至NNLL提供了缺失要素，并给出了修饰喷注关联函数与角度矩的新结果。
The effect of recoils on soft-drop-groomed observables in $γ$-tagged jets in a multistage approach
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。
We present a quantitative comparison between two grooming techniques: SoftDrop (SD) and Dynamical Grooming (DyG), in terms of the resilience of their associated observables to the underlying event, hadronization and pileup in proton-proton collisions at $\sqrt s\!=\! 13$ TeV. For that purpose, we study the groomed momentum fraction, $z_g$, in QCD jets along with boosted W tagging. In addition, we obtain the groomed momentum angle, $R_g$, within several jet quenching Monte-Carlo models in order to asses the sensitivity of SD and DyG observables to quark-gluon plasma (QGP) effects in heavy-ion c…
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…
Substructure grooming of inclusive and photon-tagged jets in heavy-ion collisions
本文研究了重离子碰撞中包容性及光子标记喷注的子结构修剪，揭示了高k_T,g处的抑制现象与部分子能量损失和选择偏差的关系，并提出R_g变宽作为喷注子结构变宽的证据。
We show the sensitivity of groomed jet substructure measurements to the finite resolution power of the QGP to disentangle multiple energetic partons, as produced by QCD jets, that traverse it simultaneously. We illustrate these effects by studying Soft Dropped observables within a hybrid strong/weak coupling model for jet-medium interactions. By analysing Monte-Carlo-generated jet data in heavy ion collisions, we show that the angular structure of these type of observables is sensitive to the value of the QGP resolution length.
Track-assisted mass is a proxy for jet mass that only uses direction information from charged particles, allowing it to be measured at the Large Hadron Collider with very fine angular resolution. In this paper, we introduce a generalization of track-assisted mass and analyze its performance in both parton shower generators and resummed calculations. For the original track-assisted mass, the track-only mass is rescaled by the charged energy fraction of the jet. In our generalization, the rescaling factor includes both per-jet and ensemble-averaged information, facilitating a closer corresponden…
A new suite of Lund-tree observables to resolve jets
本文提出了一种新的Lund树可观测量集，用于解析喷注，通过定义LTS来研究喷注的几何结构和层次结构，并在不同对撞机上进行高阶计算和现象学分析。
NLO+NLL' accurate predictions for three-jet event shapes in hadronic Higgs decays
本文为强子希格斯衰变 $H\to gg$ 和 $H\to b\bar b$ 的事件形状给出 NLO+NLL' 精确预言，并研究软滴修饰对胶子与夸克末态区分能力的影响。
Hard jet substructure in a multistage approach
本文基于JETSCAPE框架内的多阶段模型（MATTER与LBT），研究了硬喷注子结构可观测量，揭示了修改的相干效应在喷注演化中的关键作用，并准确描述了LHC数据且对RHIC未来测量作出预测。
We propose a kinematic method based on a factorization formula for precisely measuring the top quark mass $m_t$ in $pp$ collisions using boosted top jets with light soft drop grooming. By using light grooming, which is an order of magnitude less aggressive than typical grooming, we retain a universal description of the top mass scheme and decay effects, while still effectively removing soft contamination from the top jet. We give field theory results for the hadronization corrections for jets induced by a heavy top quark, showing they are described by a universal hadronic parameter that also a…
Results in Precision Multiboson+Jet Phenomenology
我们回顾了LHC精密多玻色子+喷流现象学的最新结果。我们讨论了如何在NLO QCD中计算这些过程的策略，并研究了微扰修正对预期现象的影响，特别是在异常规范玻色子耦合搜索的背景下。
QGP, a strongly coupled liquid when viewed at length scales of ${\cal O}(1/T)$, must reveal quark- and gluon-like quasi-particles when probed with sufficiently high momentum transfer, since QCD is asymptotically free. High energy jet partons traversing the droplet of QGP produced in a heavy ion collision can trigger these high-momentum exchanges with medium constituents and so have the potential to reveal the presence of such quasi-particles, a key step toward the experimental study of the microscopic structure of QGP. We implement this physics within the hybrid strong/weak coupling model whic…
Precision Jet Substructure of Boosted Boson Decays with Energy Correlators
本文通过能量相关联研究提升喷注子结构，揭示Higgs衰变中的角度峰值特征，为精确电磁弱研究和新物理探索提供新途径。
Precision jet measurements at HERA and determination of α_s
本文综述了HERA实验H1和ZEUS对深非弹性散射和光生过程中包含喷注、双喷注和三喷注产生的高精度测量的现状。测量结果与微扰QCD计算在次领先阶上符合得很好，并用于提取Z玻色子质量α s（M_Z）处的强耦合值。本文介绍了QCD分析的方法和结果，并给出了HERA最近喷流测量的α_s（M_Z）值。
Precision Multiboson Phenomenology
我们提出了最近的结果，精密多玻色子（+喷流）现象学在大型强子对撞机。将讨论双玻色子+喷流，摩擦玻色子，以及WAA +喷流的结果，重点是微扰修正对预期现象的影响。
We perform a phenomenological study of $Z$ plus jet, Higgs plus jet and di-jet production at the Large Hadron Collider. We investigate in particular the dependence of the leading jet cross section on the jet radius as a function of the jet transverse momentum. Theoretical predictions are obtained using perturbative QCD calculations at the next-to and next-to-next-to-leading order, using a range of renormalization and factorization scales. The fixed order predictions are compared to results obtained from matching next-to-leading order calculations to parton showers. A study of the scale depende…
This work presents an interpretation of high precision jet data from the ATLAS experiment in terms of exclusion limits for new coloured matter. To this end, the effect of a new coloured fermion with a mass $m_X$ on the solution of the renormalization group equation QCD is studied. Theoretical predictions for the transverse energy-energy correlation function and its asymmetry are obtained with such a modified solution and, from the comparison to data, 95\% CL exclusion limits are set on such models.
In this paper we demonstrate the agreement of jet-veto resummation and pT resummation for explaining the WW cross sections at Run 1 of the LHC, and in the future. These two resummation techniques resum different logarithms, however via reweighting methods they can be compared for various differential or exclusive cross sections. We find excellent agreement between the two resummation methods for predicting the zero-jet cross section, and propose a new reweighting method for jet-veto resummation that can be used to compare other differential distributions. We advocate a cross-channel comparison…
High precision heavy-boson-jet substructure with energy correlators
本文首次高精度研究重玻色子喷注的子结构，利用能量相关函数和Sudakov因子分解，提供N^3LL'精度的预测并验证其与模拟的一致性。
Effects of multi-scale jet-medium interactions on jet substructures
该研究使用 JETSCAPE 的 MATTER+LBT 逐事件模拟，表明高虚率早期喷注–介质相互作用减弱对解释重离子碰撞中的喷注子结构数据至关重要，并预测 gamma 标记喷注观测量。
We describe recent results from CMS and TOTEM on hard diffraction, diffractive jets and jet gap jet events. We also give the first sensitivities and limits on quartic anomalous couplings and axion-like particles at high mass using the LHC as a $γγ$ collider. The predicted sensitivities with 300 fb$^{-1}$ are better by two or three orders of magnitude compared to the more standard methods at the LHC without measuring intact protons after collision
Nonperturbative Corrections to Soft Drop Jet Mass
本文利用软共线有效理论研究了软滴修饰喷注质量分布中的强子化非微扰效应，揭示了中等质量区由三个普适参数给出的领头幂次修正及小质量区非归一化形状函数对β的非平凡依赖。
Forward-backward asymmetries of lepton pairs in events with a large transverse momentum jet at hadron colliders
本文讨论了强子对撞机中与大横向动量喷流有关的轻子对产生的前后电荷不对称性。通过测量轻子电荷相对于喷流方向A_{FB} ^j的不对称性，可以重新确定有效弱混合角sin ^2 {θ_{eff}^{lept}（M_Z^2）}，由于初始胶子过程的大截面，在大型强子对撞机（Tevatron）上经过\sim 10^{-3}（8 x 10^{-3}）切割后，理论上具有统计精度。b喷注的识别也允许在强子对撞机上测量底夸克Z不对称性A_{FB} ^b，尽管精度低于LEP，得到的sin ^2 {θ_{eff}^{lept}（M_Z^2）}的统计精度为\sim 9 x 10^{-4}（在Tevatron上为2 x 10^{-2}）。
The Future Circular Collider (FCC) is a post-LHC project aiming at direct and indirect searches for physics beyond the SM in a new 100 km tunnel at CERN. In addition, the FCC-ee offers unique possibilities for high-precision studies of the strong interaction in the clean environment provided by $e^{+}e^{-}$ collisions, thanks to its broad span of center-of-mass energies ranging from the Z pole to the top-pair threshold, and its huge integrated luminosities yielding $10^{12}$ and $10^8$ jets from Z and W bosons decays, respectively, as well as $10^5$ pure gluon jets from Higgs boson decays. In …
A Method to Simultaneously Facilitate All Jet Physics Tasks
本文提出OmniLearn方法，通过训练特定喷流分类任务的机器学习模型，提升其他喷流物理任务的精度、速度和准确性，适用于多种数据集和碰撞系统。
The Polarized Atomic Hydrogen Gas Jet Target polarimeter is employed by the Relativistic Heavy Ion Collider (RHIC) to measure the absolute polarization of each colliding proton beam. Polarimeter detectors and data acquisition were upgraded in 2015 to increase solid angle, energy range and energy resolution. These upgrades and advanced systematic error analysis along with improved beam intensity and polarization in RHIC runs 2015 ($E_\textrm{beam}=100\,\text{GeV}$) and 2017 ($255\,\text{GeV}$) allowed us to greatly reduce the statistical and systematic uncertainties for elastic spin asymmetries…
We discuss the prospects of using jets as precision probes in electron-nucleus collisions at the future Electron-Ion Collider. Jets produced in deep-inelastic scattering can be calibrated by a measurement of the scattered electron. Such electron-jet "tag and probe" measurements call for an approach that is orthogonal to most HERA jet measurements as well as previous studies of jets at the future EIC. We present observables such as the electron-jet momentum balance, azimuthal correlations and jet substructure, which can provide constraints on the parton transport coefficient in nuclei. We compa…
To deepen the search for beyond the Standard Model physics, the Large Hadron Collider is pushing to higher and higher luminosity. At high luminosity, precision physics becomes increasingly difficult due to contamination from additional proton collisions per bunch crossing called pile-up. In recent years, many methods have been developed to cull this excess mostly low-energy radiation away from important signal regions, but it has been unclear if these methods were amenable to systematically-improvable theoretical understanding. In this paper, it is shown that one such method, soft drop jet gro…
In the first talk I discuss the usefulness of jet grooming for testing jet quenching mechanisms, and I present a calculation of soft-drop jet mass distribution in proton-proton and heavy ion collisions. In the second talk I discuss the comprehensive studies of quark and gluon jet substructure as a way to search for qualitatively new jet modification signatures. I emphasize the importance of precise understanding of jet substructure as well as powerful analysis tools in future heavy ion jet physics studies, with direct applications to hard probes using heavy flavors and hadronically-decaying el…
The Ratio of W + N jets To Z/gamma + N jets As a Precision Test of the Standard Model
本文建议在强子对撞机上用（W+0喷注）/（Z+0喷注）、（W+1喷注）/（Z+1喷注）、（W+2喷注）/（Z+2喷注）、（W+1喷注）/（Z+2喷注）、（W+2喷注）/（Z+1喷注）等比值的精确测量代替对W + N喷注和Z/γ + N喷注产生的单个截面的测量，以寻找新的高能现象。（W+N喷流）/（Z+N喷流），其中N最大为6（以ttbarH为单位的喷流数目）。这些比值也可以在一个或多个喷流被标记为b或c夸克的情况下形成。在Tevatron的Wenu + N喷流的个人截面的现有测量具有随N迅速增长的系统不确定性，其主要由喷流识别和喷流能量尺度的不确定性决定。这些系统学，以及与光度、部分子分布函数（PDF's）、探测器接受度和效率以及喷流发现和b标记系统学相关的系统学，预计将在计算每个N喷流通道中W与Z产生的比率时基本上取消，从而在Tevatron和LHC的运行II中对这些通道中的新贡献具有更高的灵敏度。
$Z$-plus-jet Production with JETHAD-DYnamis: Angular Structure, Polarization, Fixed-Order Matching
该研究将精确计算方案扩展至Drell-Yan加喷注产生过程，提出JETHAD-DYnamis-POWHEG匹配策略，实现了快度分离的电弱玻色子加喷注末态的首个高能重求和描述，可为LHC及高亮度LHC测量提供精确理论支撑。
The azimuthal decorrelation between a vector boson and a jet is an essential hard probe in high energy proton-proton and heavy-ion collisions. We overcome intrinsic limitations of previous studies by using a recoil-free axis, achieving unprecedented next-to-next-to-leading logarithmic accuracy with small nonperturbative corrections. This choice of axis also makes the observable robust in the presence of a large background. Furthermore, the azimuthal angle distribution is minimally changed when determined using only charged particle tracks, which offer superior angular resolution for precise me…
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