The LHCb vertex locator upgrade — the detector calibration overview

2022 ◽  
Vol 17 (01) ◽  
pp. C01046
Author(s):  
P. Kopciewicz ◽  
S. Maccolini ◽  
T. Szumlak
Keyword(s):  
Large Hadron Collider ◽  
Cp Violation ◽  
Hadron Collider ◽  
Data Rate ◽  
Readout System ◽  
Output Data ◽  
Detector Calibration ◽  
Lhcb Experiment ◽  
Tracking Detector ◽  
Tracking Technology

Abstract The Vertex Locator (VELO) is a silicon tracking detector in the spectrometer of the Large Hadron Collider beauty (LHCb) experiment. LHCb explores and investigates CP violation phenomena in b- and c- hadron decays and is one of the experiments operating on the Large Hadron Collider (LHC) at CERN. After run 1 and run 2 of LHC data taking (2011–2018), the LHCb detectors are being modernized within the LHCb upgrade I program. The upgrade aims to adjust the spectrometer to readout at full LHC 40 MHz frequency, which requires radical changes to the technologies currently used in LHCb. The hardware trigger is removed, and some of the detectors replaced. The VELO changes its tracking technology and silicon strips are replaced by 55 μm pitch silicon pixels. The readout chip for the VELO upgrade is the VeloPix ASIC. The number of readout channels increases to over 40 million, and the hottest ASIC is expected to produce the output data rate of 15 Gbit/s. New conditions challenge the software and the hardware side of the readout system and put special attention on the detector monitoring. This paper presents the upgraded VELO design and outlines the software aspects of the detector calibration in the upgrade I. An overview of the challenges foreseen for the upgrade II is given.

scholarly journals SIGNATURES FOR BLACK HOLE PRODUCTION FROM HADRONIC OBSERVABLES AT THE LARGE HADRON COLLIDER

2007 ◽  
Vol 16 (03) ◽  
pp. 841-851 ◽  
Author(s):  
THOMAS J. HUMANIC ◽  
BENJAMIN KOCH ◽  
HORST STÖCKER
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Large Hadron Collider ◽  
Particle Tracking ◽  
Extra Dimensions ◽  
Large Extra Dimensions ◽  
Hadron Collider ◽  
Hierarchy Problem ◽  
Tracking Detector ◽  
Weak Forces

The concept of Large Extra Dimensions (LED) provides a way of solving the Hierarchy Problem which concerns the weakness of gravity compared with the strong and electro-weak forces. A consequence of LED is that miniature Black Holes (mini-BHs) may be produced at the Large Hadron Collider in p + p collisions. The present work uses the CHARYBDIS mini-BH generator code to simulate the hadronic signal which might be expected in a mid-rapidity particle tracking detector from the decay of these exotic objects if indeed they are produced. An estimate is also given for Pb + Pb collisions.

scholarly journals Unleashing the full power of LHCb to probe Stealth New Physics

2021 ◽  
Author(s):  
Martino Borsato ◽  
Xabier Cid-Vidal ◽  
Yuhsin Tsai ◽  
Carlos Vázquez Sierra ◽  
Jose Francisco Zurita ◽  
...  
Keyword(s):  
Large Hadron Collider ◽  
Standard Model ◽  
Hadron Collider ◽  
Theoretical Models ◽  
New Physics ◽  
Precision Measurements ◽  
Beyond The Standard Model ◽  
Lhcb Experiment ◽  
The Standard Model ◽  
Full Power

Abstract 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 processes. Stealth signatures include long-lived particles and light resonances that are produced very rarely or together with overwhelming backgrounds. We will discuss why LHCb is equipped to discover this kind of physics at the Large Hadron Collider and provide examples of well-motivated theoretical models that can be probed with great detail at the experiment.

scholarly journals QUANTITATIVE CALCULATIONS FOR BLACK HOLE PRODUCTION AT THE LARGE HADRON COLLIDER

2009 ◽  
Vol 24 (06) ◽  
pp. 1105-1118
Author(s):  
NICOLAS BOCK ◽  
THOMAS J. HUMANIC
Keyword(s):  
Black Hole ◽  
Large Hadron Collider ◽  
Particle Tracking ◽  
Extra Dimensions ◽  
Large Extra Dimensions ◽  
Hadron Collider ◽  
High Energy ◽  
The Other ◽  
Tracking Detector ◽  
Quantitative Calculations

The framework of large extra dimensions provides a way to explain why gravity is weaker than the other forces in nature. A consequence of this model is the possible production of D-dimensional black holes in high energy p–p collisions at the Large Hadron Collider. The present work uses the CATFISH black hole generator to study quantitatively how these events could be observed in the hadronic channel at midrapidity using a particle-tracking detector.

scholarly journals A Comparison of CPU and GPU Implementations for the LHCb Experiment Run 3 Trigger

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
R. Aaij ◽  
M. Adinolfi ◽  
S. Aiola ◽  
S. Akar ◽  
J. Albrecht ◽  
...  
Keyword(s):  
Data Collection ◽  
Large Hadron Collider ◽  
Hadron Collider ◽  
Detailed Comparison ◽  
Software Implementation ◽  
Lhcb Experiment ◽  
Level Trigger ◽  
Data Collection Period ◽  
Collection Period ◽  
High Level

AbstractThe Large Hadron Collider beauty (LHCb) experiment at CERN is undergoing an upgrade in preparation for the Run 3 data collection period at the Large Hadron Collider (LHC). As part of this upgrade, the trigger is moving to a full software implementation operating at the LHC bunch crossing rate. We present an evaluation of a CPU-based and a GPU-based implementation of the first stage of the high-level trigger. After a detailed comparison, both options are found to be viable. This document summarizes the performance and implementation details of these options, the outcome of which has led to the choice of the GPU-based implementation as the baseline.

scholarly journals Two Higgs Bosons near 125 GeV in the Complex NMSSM and the LHC Run I Data

2015 ◽  
Vol 2015 ◽  
pp. 1-16 ◽  
Author(s):  
Stefano Moretti ◽  
Shoaib Munir
Keyword(s):  
Higgs Boson ◽  
Large Hadron Collider ◽  
Cp Violation ◽  
Standard Model ◽  
Supersymmetric Standard Model ◽  
Hadron Collider ◽  
Higgs Sector ◽  
Higgs Bosons ◽  
Neutral Higgs Boson ◽  
The Impact

We analyse the impact of explicit CP-violation in the Higgs sector of the Next-to-Minimal Supersymmetric Standard Model (NMSSM) on its consistency with the Higgs boson data from the Large Hadron Collider (LHC). Through detailed scans of the parameter space of the complex NMSSM for certain fixed values of one of its CP-violating (CPV) phases, we obtain a large number of points corresponding to five phenomenologically relevant scenarios containing ∼125 GeV Higgs boson(s). We focus, in particular, on the scenarios where the visible peaks in the experimental samples can actually be explained by two nearly mass-degenerate neutral Higgs boson states. We find that some points corresponding to these scenarios give an overall slightly improved fit to the data, more so for nonzero values of the CPV phase, compared to the scenarios containing a single Higgs boson near 125 GeV.

scholarly journals Upgrade of the CMS resistive plate chambers for the high luminosity LHC

2022 ◽  
Vol 17 (01) ◽  
pp. C01011
Author(s):  
A. Samalan ◽  
M. Tytgat ◽  
G.A. Alves ◽  
F. Marujo ◽  
F. Torres Da Silva De Araujo ◽  
...  
Keyword(s):  
Large Hadron Collider ◽  
Compact Muon Solenoid ◽  
Hadron Collider ◽  
Present System ◽  
High Luminosity ◽  
Readout System ◽  
Experimental Conditions ◽  
Cms Experiment ◽  
Front End ◽  
Resistive Plate Chambers

Abstract During the upcoming High Luminosity phase of the Large Hadron Collider (HL-LHC), the integrated luminosity of the accelerator will increase to 3000 fb−1. The expected experimental conditions in that period in terms of background rates, event pileup, and the probable aging of the current detectors present a challenge for all the existing experiments at the LHC, including the Compact Muon Solenoid (CMS) experiment. To ensure a highly performing muon system for this period, several upgrades of the Resistive Plate Chamber (RPC) system of the CMS are currently being implemented. These include the replacement of the readout system for the present system, and the installation of two new RPC stations with improved chamber and front-end electronics designs. The current overall status of this CMS RPC upgrade project is presented.

scholarly journals CP violation in charm

2022 ◽  
Vol 258 ◽  
pp. 06006
Author(s):  
Keyword(s):  
Cp Violation ◽  
Lhcb Collaboration ◽  
Readout System ◽  
Lhcb Experiment ◽  
Large Samples ◽  
Charm Hadron ◽  
Long Time ◽  
Beauty Mesons ◽  
First Time ◽  
Integrated Luminosity

The existence of CP violation in the decays of strange and beauty mesons is very well established experimentally. On the contrary, CP violation in the decays of charmed particles has been elusive for a long time and has been observed for the first time in 2019 by the LHCb experiment. Since then several studies have been performed in the charm sector. During the LHC Run 1 and Run 2, the LHCb collaboration has collected large samples containing charm hadron decays, on a scale never seen before. Collected data enabled physicists to obtain several new results, most of which surpassed previous results and became new world’s best measurements. Presently the LHCb spectrometer is being upgraded to enhance readout system, improve subdetector components and increase integrated luminosity to 50 fb−1 by the end of Run 4.

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