scholarly journals CP violation in beauty with the LHCb experiment

2021 ◽  
Author(s):  
Alessandro Bertolin
Keyword(s):  
Cp Violation ◽  
Lhcb Experiment

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.

RECENT RESULTS FROM THE LHCb EXPERIMENT

2012 ◽  
Vol 27 (30) ◽  
pp. 1230031
Author(s):  
◽  
PIERLUIGI CAMPANA ◽  
GAIA LANFRANCHI
Keyword(s):  
Cp Violation ◽  
New Physics ◽  
B Decays ◽  
Lhcb Experiment ◽  
Rare B Decays ◽  
Electroweak Physics ◽  
Integrated Luminosity

We present a review of the operation and of the most recent results from the LHCb experiment at the LHC collider, based on the analyses performed using the data collected in 2010 and 2011, which correspond to an integrated luminosity of ~ 1 fb-1. These measurements set stringent new limits on the contributions of New Physics processes in the field of rare b decays, and in the search for CP violation in B0 and [Formula: see text] mesons decays. In addition, a summary of results from studies of CP violation in the charm sector are presented, together with measurements in quarkonia production, in spectroscopy, in electroweak physics and in searches for exotica. The planned upgrade of LHCb is also briefly discussed.

Study of CP violation at the LHCb experiment at CERN

2011 ◽  
Vol 12 (9-10) ◽  
pp. 921-927
Author(s):  
Patrick Robbe
Keyword(s):  
Cp Violation ◽  
Lhcb Experiment

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.

scholarly journals A Review of CP Violation Measurements in Charm at LHCb

Symmetry ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 1482
Author(s):  
Federico Betti
Keyword(s):  
Cp Violation ◽  
Precise Measurement ◽  
Mass Difference ◽  
Time Dependent ◽  
Charm Meson ◽  
Cp Asymmetry ◽  
Lhcb Experiment ◽  
Charm Hadron

The LHCb experiment has been able to collect the largest sample ever produced of charm-hadron decays, performing a number of measurements of observables related to CP violation in the charm sector. In this document, the most recent results from LHCb on the search of direct CP violation in D0→Ks0Ks0, D(s)+→h+π0 and D(s)+→h+η decays are summarised, in addition to the most precise measurement of time-dependent CP asymmetry in D0→h+h− decays and the first observation of mass difference between neutral charm-meson eigenstates.

scholarly journals Search for CP violation in $${{{\varXi }} ^+_{c}} \rightarrow {p} {{K} ^-} {{\pi } ^+} $$ decays using model-independent techniques

2020 ◽  
Vol 80 (10) ◽  
Author(s):  
R. Aaij ◽  
◽  
C. Abellán Beteta ◽  
T. Ackernley ◽  
B. Adeva ◽  
...  
Keyword(s):  
Cp Violation ◽  
Dalitz Plot ◽  
Proton Collision ◽  
Centre Of Mass ◽  
Proton Proton ◽  
Lhcb Experiment ◽  
Independent Technique ◽  
Proton Proton Collision ◽  
Model Independent ◽  
Cabibbo Suppressed

AbstractA first search for $$CP$$ CP violation in the Cabibbo-suppressed $${{{\varXi }} ^+_{c}} \rightarrow {p} {{K} ^-} {{\pi } ^+} $$ Ξ c + → p K - π + decay is performed using both a binned and an unbinned model-independent technique in the Dalitz plot. The studies are based on a sample of proton-proton collision data, corresponding to an integrated luminosity of $$3.0\,\text {fb} ^{-1} $$ 3.0 fb - 1 , and collected by the LHCb experiment at centre-of-mass energies of 7 and $$8\,\text {TeV} $$ 8 TeV . The data are consistent with the hypothesis of no $$CP$$ CP violation.

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