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View article: Iterative HOMER with uncertainties
Iterative HOMER with uncertainties Open
We present iHOMER, an iterative version of the HOMER method to extract Lund fragmentation functions from experimental data. Through iterations, we address the information gap between latent and observable phase spaces and systematically re…
View article: Technical design report for the CODEX-<i>β</i> demonstrator
Technical design report for the CODEX-<i>β</i> demonstrator Open
The CODEX- β apparatus is a demonstrator for the proposed future CODEX-b experiment, a long-lived-particle detector foreseen for operation at IP8 during HL-LHC data-taking. The demonstrator project, intended to collect data in 2025, is des…
View article: CODEX-b: Opening New Windows to the Long-Lived Particle Frontier at the LHC
CODEX-b: Opening New Windows to the Long-Lived Particle Frontier at the LHC Open
This document is written as a contribution to the European Strategy of Particle Physics (ESPP) update. We offer a detailed overview of current developments and future directions for the CODEX-b detector, which aims to detect long-lived par…
View article: Describing hadronization via histories and observables for Monte-Carlo event reweighting
Describing hadronization via histories and observables for Monte-Carlo event reweighting Open
We introduce a novel method for extracting a fragmentation model directly from experimental data without requiring an explicit parametric form, called Histories and Observables for Monte-Carlo Event Reweighting (HOMER), consisting of three…
View article: Towards a data-driven model of hadronization using normalizing flows
Towards a data-driven model of hadronization using normalizing flows Open
We introduce a model of hadronization based on invertible neural networks that faithfully reproduces a simplified version of the Lund string model for meson hadronization. Additionally, we introduce a new training method for normalizing fl…
View article: Reweighting Monte Carlo predictions and automated fragmentation variations in Pythia 8
Reweighting Monte Carlo predictions and automated fragmentation variations in Pythia 8 Open
This work reports on a method for uncertainty estimation in simulated collider-event predictions. The method is based on a Monte Carlo-veto algorithm, and extends previous work on uncertainty estimates in parton showers by including uncert…
View article: Event generators for high-energy physics experiments
Event generators for high-energy physics experiments Open
We provide an overview of the status of Monte-Carlo event generators for high-energy particle physics. Guided by the experimental needs and requirements, we highlight areas of active development, and opportunities for future improvements. …
View article: Non-relativistic quantum chromodynamics in parton showers
Non-relativistic quantum chromodynamics in parton showers Open
View article: Technical design report for the CODEX-beta demonstrator
Technical design report for the CODEX-beta demonstrator Open
The CODEX-$\beta$ apparatus is a demonstrator for the proposed future CODEX-b experiment, a long-lived-particle detector foreseen for operation at IP8 during HL-LHC data-taking. The demonstrator project, intended to collect data in 2025, i…
View article: Non-Relativistic Quantum Chromodynamics in Parton Showers
Non-Relativistic Quantum Chromodynamics in Parton Showers Open
Measurements of quarkonia isolation in jets at the Large Hadron Collider (LHC) have been shown to disagree with fixed-order non-relativistic quantum chromodynamics (NRQCD) calculations, even at higher orders. Calculations using the fragmen…
View article: Towards a data-driven model of hadronization using normalizing flows
Towards a data-driven model of hadronization using normalizing flows Open
We introduce a model of hadronization based on invertible neural networks that faithfully reproduces a simplified version of the Lund string model for meson hadronization. Additionally, we introduce a new training method for normalizing fl…
View article: Reweighting Monte Carlo Predictions and Automated Fragmentation Variations in Pythia 8
Reweighting Monte Carlo Predictions and Automated Fragmentation Variations in Pythia 8 Open
This work reports on a method for uncertainty estimation in simulated collider-event predictions. The method is based on a Monte Carlo-veto algorithm, and extends previous work on uncertainty estimates in parton showers by including uncert…
View article: Serendipity in dark photon searches
Serendipity in dark photon searches Open
Searches for dark photons provide serendipitous discovery potential for other types of vector particles. We develop a framework for recasting dark photon searches to obtain constraints on more general theories, which includes a data-driven…
View article: Machine learning and LHC event generation
Machine learning and LHC event generation Open
First-principle simulations are at the heart of the high-energy physics research program. They link the vast data output of multi-purpose detectors with fundamental theory predictions and interpretation. This review illustrates a wide rang…
View article: Modeling hadronization using machine learning
Modeling hadronization using machine learning Open
We present the first steps in the development of a new class of hadronization models utilizing machine learning techniques. We successfully implement, validate, and train a conditional sliced-Wasserstein autoencoder to replicate the Pythia…
View article: The present and future status of heavy neutral leptons
The present and future status of heavy neutral leptons Open
The existence of nonzero neutrino masses points to the likely existence of multiple Standard Model neutral fermions. When such states are heavy enough that they cannot be produced in oscillations, they are referred to as heavy neutral lept…
View article: Axial vectors in DarkCast
Axial vectors in DarkCast Open
A bstract In this work, we explore new spin-1 states with axial couplings to the standard model fermions. We develop a data-driven method to estimate their hadronic decay rates based on data from τ decays and using SU(3) flavor symmetry. W…
View article: A comprehensive guide to the physics and usage of PYTHIA 8.3
A comprehensive guide to the physics and usage of PYTHIA 8.3 Open
This manual describes the Pythia event generator, the most recent version of an evolving physics tool used to answer fundamental questions in particle physics. The program is most often used to generate high-energy-physics collision “event…
View article: Codebase release 8.3 for PYTHIA
Codebase release 8.3 for PYTHIA Open
This manual describes the Pythia event generator, the most recent version of an evolving physics tool used to answer fundamental questions in particle physics. The program is most often used to generate high-energy-physics collision “event…
View article: Report on 2203.07460v1
Report on 2203.07460v1 Open
First-principle simulations are at the heart of the high-energy physics research program.They link the vast data output of multi-purpose detectors with fundamental theory predictions and interpretation.This review illustrates a wide range …
View article: Experiments and Facilities for Accelerator-Based Dark Sector Searches
Experiments and Facilities for Accelerator-Based Dark Sector Searches Open
This paper provides an overview of experiments and facilities for accelerator-based dark matter searches as part of the US Community Study on the Future of Particle Physics (Snowmass 2021). Companion white papers to this paper present the …
View article: A comprehensive guide to the physics and usage of PYTHIA 8.3
A comprehensive guide to the physics and usage of PYTHIA 8.3 Open
This manual describes the PYTHIA 8.3 event generator, the most recent version of an evolving physics tool used to answer fundamental questions in particle physics. The program is most often used to generate high-energy-physics collision "e…
View article: The Road Ahead for CODEX-b
The Road Ahead for CODEX-b Open
In this Snowmass contribution we present a comprehensive status update on the progress and plans for the proposed CODEX-b detector, intended to search for long-lived particles beyond the Standard Model. We review the physics case for the p…
View article: Machine Learning and LHC Event Generation
Machine Learning and LHC Event Generation Open
First-principle simulations are at the heart of the high-energy physics research program. They link the vast data output of multi-purpose detectors with fundamental theory predictions and interpretation. This review illustrates a wide rang…
View article: Forming molecular states with hadronic rescattering
Forming molecular states with hadronic rescattering Open
View article: Unleashing the full power of LHCb to probe stealth new physics
Unleashing the full power of LHCb to probe stealth new physics Open
In this paper, we describe the potential of the LHCb experiment to detect stealth physics. This refers to dynamics beyond the standard model that would elude searches that focus on energetic objects or precision measurements of known proce…
View article: Microchannel cooling for the LHCb VELO Upgrade I
Microchannel cooling for the LHCb VELO Upgrade I Open
The LHCb VELO Upgrade I, currently being installed for the 2022 start of LHC Run 3, uses silicon microchannel coolers with internally circulating bi-phase \cotwo for thermal control of hybrid pixel modules operating in vacuum. This is the …
View article: Review of opportunities for new long-lived particle triggers in Run 3 of the Large Hadron Collider
Review of opportunities for new long-lived particle triggers in Run 3 of the Large Hadron Collider Open
Long-lived particles (LLPs) are highly motivated signals of physics Beyond the Standard Model (BSM) with great discovery potential and unique experimental challenges. The LLP search programme made great advances during Run 2 of the Large H…
View article: arXiv : Review of opportunities for new long-lived particle triggers in Run 3 of the Large Hadron Collider
arXiv : Review of opportunities for new long-lived particle triggers in Run 3 of the Large Hadron Collider Open
Long-lived particles (LLPs) are highly motivated signals of physics Beyond the Standard Model (BSM) with great discovery potential and unique experimental challenges. The LLP search programme made great advances during Run 2 of the Large H…