scholarly journals A Large Hadron Collider Beauty experiment for precision measurements of CP violation and rare decays. LHCb technical proposal

1998 ◽  
Author(s):  
Dario B. Crosetto
Keyword(s):  
Large Hadron Collider ◽  
Cp Violation ◽  
Rare Decays ◽  
Hadron Collider ◽  
Precision Measurements

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.

B-Meson Decay

2017 ◽  
Vol 3 (3) ◽  
Author(s):  
Joaquim Matias
Keyword(s):  
Large Hadron Collider ◽  
Rare Decays ◽  
B Mesons ◽  
B Meson ◽  
Hadron Collider ◽  
New Physics ◽  
Meson Decay ◽  
B Meson Decay ◽  
Particle Physicist

Particle physicist Joaquim Matias analyzes recent results from the Large Hadron Collider—in particular, rare decays of B-mesons that suggest the violation of leptonic universality—for evidence of New Physics.

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 A review on non-minimal universal extra dimensions

2015 ◽  
Vol 30 (05) ◽  
pp. 1530003 ◽  
Author(s):  
Thomas Flacke ◽  
Kyoungchul Kong ◽  
Seong Chan Park
Keyword(s):  
Dark Matter ◽  
Large Hadron Collider ◽  
Extra Dimension ◽  
Extra Dimensions ◽  
Hadron Collider ◽  
Precision Measurements ◽  
Current Status ◽  
Universal Extra Dimension

We report on the current status of non-minimal universal extra dimension (NMUED) models. Our emphasis is on the possible extension of the minimal UED (MUED) model by allowing bulk masses and boundary localized terms. We take into account the data from the Large Hadron Collider (LHC) as well as direct and indirect searches of dark matter (DM) and electroweak (EW) precision measurements.

scholarly journals CHARM: MIXING, CP VIOLATION AND RARE DECAYS AT LHCb

2014 ◽  
Vol 35 ◽  
pp. 1460414
Author(s):  
MICHAEL ALEXANDER ◽  
Keyword(s):  
Cp Violation ◽  
Standard Model ◽  
Rare Decays ◽  
Branching Fractions ◽  
Charm Physics ◽  
Precision Measurements ◽  
Beyond The Standard Model ◽  
Mixing Parameters ◽  
The Standard Model ◽  
Wrong Sign

Recent results on mixing, CP violation and rare decays in charm physics from the LHCb experiment are presented. Study of "wrong-sign" D0 → K+π- decays provides the highest precision measurements to date of the mixing parameters x′2 and y′, and of CP violation in this decay mode. Direct and indirect CP violation in the D0 system are probed to a sensitivity of around 10-3 using D0 → K+K− and D0 → π+π− decays and found to be consistent with zero. Searches for the rare decays [Formula: see text], [Formula: see text] and D0 → μ+μ− find no evidence of signal, but set the best limits on branching fractions to date. Thus, despite many excellent results in charm physics from LHCb, no evidence for physics beyond the Standard Model is found.

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.

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