We propose symbolic regression as a powerful tool for studying Beyond the
Standard Model physics. As a benchmark model, we consider the so-called
Constrained Minimal Supersymmetric Standard Model, which has a four-dimensional
parameter space defined at the GUT scale. We provide a set of analytical
expressions that reproduce three low-energy observables of interest in terms of
the parameters of the theory: the Higgs mass, the contribution to the anomalous
magnetic moment of the muon, and the cold dark matter relic density. To
demonstrate the power of the approach, we employ the symbolic expressions in a
global fits analysis to derive the posterior probability densities of the
parameters, which are obtained extremely rapidly in comparison with
conventional methods.

我们使用符号回归作为研究超出标准模型物理的有力工具，提供了一组分析表达式，用理论参数来重现三个感兴趣的低能观测值：希格斯玻色子质量、修正磁动量与矛盾的贡献以及冷暗物质剩余密度。我们使用这些符号表达式进行全局拟合分析，极快地得到参数的后验概率密度，相较于传统方法具有极大的优势。

超越标准模型物理的符号回归

Symbolic Regression for Beyond the Standard Model Physics

Model-agnostic anomaly detection is one of the promising approaches in the
search for new beyond the standard model physics. In this paper, we present
Set-VAE, a particle-based variational autoencoder (VAE) anomaly detection
algorithm. We demonstrate a 2x signal efficiency gain compared with traditional
subjettiness-based jet selection. Furthermore, with an eye to the future
deployment to trigger systems, we propose the CLIP-VAE, which reduces the
inference-time cost of anomaly detection by using the KL-divergence loss as the
anomaly score, resulting in a 2x acceleration in latency and reducing the
caching requirement.

我们提出了一种基于粒子的变分自编码器（VAE）异常检测算法 Set-VAE，该算法在与传统基于子结构的喷注选择相比下，实现了 2 倍的信号效率提高。此外，为了未来部署到触发系统，我们提出了 CLIP-VAE，使用 KL 散度作为异常得分，从而减少推理时间成本，加快 2 倍的延迟速度，并减少缓存需求。

具有变分自编码器的快速基于粒子的异常检测算法

Fast Particle-based Anomaly Detection Algorithm with Variational  Autoencoder

In this paper we describe Herwig++ version 2.3, a general-purpose Monte Carlo
event generator for the simulation of hard lepton-lepton, lepton-hadron and
hadron-hadron collisions. A number of important hard scattering processes are
available, together with an interface via the Les Houches Accord to specialized
matrix element generators for additional processes. The simulation of Beyond
the Standard Model (BSM) physics includes a range of models and allows new
models to be added by encoding the Feynman rules of the model. The
parton-shower approach is used to simulate initial- and final-state QCD
radiation, including colour coherence effects, with special emphasis on the
correct description of radiation from heavy particles. The underlying event is
simulated using an eikonal multiple parton-parton scattering model. The
formation of hadrons from the quarks and gluons produced in the parton shower
is described using the cluster hadronization model. Hadron decays are simulated
using matrix elements, where possible including spin correlations and off-shell
effects.

本文介绍了 Herwig++ 2.3 版本，它是一个通用的蒙特卡罗事件生成器，用于模拟硬子 - 子，子 - 强子和强子 - 强子碰撞等多种物理过程，并支持模拟超越标准模型的物理过程，如新模型的添加、粒子级联衰变等。它采用零散子模型模拟强子的形成过程，并在可行的情况下包括自旋相关和离壳效应。