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OMS Data Aggregation and Management in the CMS Experiment
No full textThe Online Monitoring System (OMS) at the Compact Muon Solenoid (CMS) experiment at CERN collects and combines various non-event data sources, allowing users to view, compare, and correlate real-time and historical information. The OMS data warehouse (DWH) constitutes the foundation of the Online Monitoring System (OMS) architecture within CMS, responsible for the storage and manipulation of non-event data within ORACLE databases. Using PL/SQL code, the DWH orchestrates the data aggregation and processing from several sources, inheriting and revamping code from a previous project known as Web Based Monitoring (WBM) to meet evolving requirements.The main goals of the WBM databases restructuring were: the modernization of inherited PL/SQL code, necessitating the creation of new aggregation tables and the implementation of enhancements such as standardized naming conventions, improved development workflows, and continuous integration strategies. DWH is composed of multiple Oracle schemas and integrates external PL/SQL libraries, particularly the CERN Beams Common4Oracle library, which consolidates common functionalities from various CERN Beams department databases into a unified codebase for widespread application.This article describes into the architecture and development strategies employed within the OMS data warehouse, underscoring its role in facilitating efficient data aggregation and management within the OMS project in the CMS experiment at CERN
On-the-fly data set combinations with RNTuple
No full textWith the expected data volume increase for HL-LHC and the even more complex computing challenges set by future colliders, the need for efficient data storage and processing becomes more pressing. ROOT’s next-generation data format and I/O subsystem, RNTTuple, is designed to address these challenges. RNTTuple already demonstrates a clear improvement in storage and I/O efficiency, as well as overall stability and robustness with respect to its predecessor, TTTree. These improvements provide a solid baseline to introduce novel extensions to common high-energy and nuclear physics (HENP) workflows. Notably, many workflows could benefit from the ability to arbitrarily join and chain data set samples at runtime, which could reduce overall storage requirements and improve application runtime and ergonomics. In this paper, we present the RNTupleProcessor, which enables HENP data set combinations with RNTuple. We will discuss the main design considerations, present the interfaces to support data set combinations and show how they integrate in typical workflows
Massive Feynman integrals at high energies: recent analytic results
No full textThe high-energy behaviour of scattering amplitudes involving massive particles has attracted interest in recent years. In these proceedings, we report on the analytic tool AsyInt for solving massive multi-loop Feynman integrals in the high-energy limit, which are fundamental building blocks for such amplitudes in the full Standard Model. We present recent analytic results for two-loop four-point Feynman integrals with both internal and external masses in this limit, featuring polylogarithmic and elliptic structures
A Beamdump Facility at Jefferson Lab
No full textThis White Paper is exploring the potential of intense secondary muon, neutrino, and (hypothetical) light dark matter beams produced in interactions of high-intensity electron beams with beam dumps. Light dark matter searches with the approved Beam Dump eXperiment (BDX) are driving the realization of a new underground vault at Jefferson Lab that could be extended to a Beamdump Facility with minimal additional installations. The paper summarizes contributions and discussions from the International Workshop on Secondary Beams at Jefferson Lab (BDX & Beyond). Several possible muon physics applications and neutrino detector technologies for Jefferson Lab are highlighted. The potential of a secondary neutron beam will be addressed in a future edition
FPGA Implementation of the General Triplet Track Fit
No full textThe reconstruction of charged particle trajectories is one of the most computationally intensive tasks within current and future filter farms of large High-Energy Physics (HEP) experiments. Due to the increasing number of simultaneous collisions in future high-luminosity colliders, like the HL-LHC and FCC-hh, the challenge of online tracking and event reconstruction becomes even more significant and requires innovative algorithms and appropriate hardware choices for its acceleration.The General Triplet Track Fit is a novel parallelizable track-fitting algorithm that offers a great potential for speed-up by processing triplets of hits independently and allowing to factorize the track reconstruction chain into a detectordependent and independent parts. FPGAs, with their inherent parallelism, power efficiency, and reconfigurability, are becoming increasingly attractive as co-processors for large data centres, such as heterogeneous online farms, to meet the challenges of increasing throughput and computational complexity.A preliminary FPGA implementation of the General Triplet Track Fit has been developed using High-Level Synthesis on AMD FPGAs. Synthesis results indicate that with float precision, a throughput of approximately 107 track fits per second can be achieved, with further room for improvement. The method’s versatility across diverse detector types and its capability to reject fake triplets hold early promise for robust performance in future high-energy physics experiments
HOM SiC loads for CLIC X-band structures: Design and measurements
No full textThe Compact Linear Collider (CLIC) main linac employs a waveguide-damped structure as its baseline design. To ensure beam dynamic stability, the transverse wakefield must be less than 3.4 V/pC/m/mm in 0.5 ns, corresponding with the position of the second bunch. This study focuses on optimizing high-order-mode (HOM) damping loads through new material measurements, achieving enhanced suppression of long-range transverse wakefields. The new damping load is 20% more compact than those in the previous CLIC structure design
Searches for dark matter with CMS in mono-X signatures
No full textDetermination of the nature of dark matter is one of the most fundamental problems of particle physics and cosmology. These proceedings present recent searches for dark matter particles from the CMS experiment at the Large Hadron Collider, focusing on mono-X signatures
Observation of a family of all-charm tetraquarks with spin-2 and positive parity at CMS
No full textA comprehensive study of all-charm tetraquark candidates is presented in this paper. The search is performed in the mass spectrum using proton-proton collision data at and 13.6 TeV collected with the CMS detector at the LHC. With about 3.6 times more pairs compared to the Run 2 dataset alone, the combined Run 2 (2016--2018) and Run 3 (2022--2024) sample provides significantly improved sensitivity to rare structures. In the channel, three structures are observed each with a significance well above 5, denoted , , and , consistent with the earlier Run 2 observation. In addition, quantum interferences between these states are observed, each with a significance above 5, implying they share the same spin-parity quantum numbers. In addition, a search is conducted in the channel, revealing two structures with masses and widths consistent with and . To further explore the nature of these states, a spin-parity measurement is conducted with the Run 2 data. Assuming common quantum numbers for the three states, as motivated by the interference pattern, the results favor a assignment---an unusual quantum number among known hadrons. The combined features of these analyses point to a coherent picture in which the states observed by CMS constitute a family of all-charm tetraquarks, favoring a diquark-antidiquark structure in which both diquarks are in a spin-1 state and aligned. The findings provide new insights into the internal dynamics of exotic resonances
Overview of ATLAS forward proton detectors: status, performance and new physics results
No full textA key focus of the physics program at the LHC is the study of head-on proton-proton collisions. However, an important class of physics can be studied for cases where the protons narrowly miss one another and remain intact. In such cases, the electromagnetic fields surrounding the protons can interact producing high-energy photon-photon collisions. Alternatively, interactions mediated by the strong force can also result in intact forward scattered protons, providing probes of quantum chromodynamics (QCD). In order to aid identification and provide unique information about these rare interactions, instrumentation to detect and measure protons scattered through very small angles is installed in the beam pipe far downstream of the interaction point. We describe the ATLAS Forward Proton AFP Detectors, including their performance to date, covering Tracking and Time-of-Flight Detectors as well as the associated electronics, trigger, readout, detector control and data quality monitoring. Finally, a glimpse on the newest results will be given