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 CPLEAR data on semileptonic decay of K0, K̄0 and the mass difference of KL0 and KS0 mesons

2015 ◽  
Vol 39 ◽  
pp. 1560101
Author(s):  
Stanislav Dubnicka ◽  
Anna-Zuzana Dubnickova
Keyword(s):  
Cp Violation ◽  
Semileptonic Decay ◽  
Mass Difference ◽  
Time Dependent ◽  
Theoretical Formula ◽  
Difference Formula

It is demonstrated that for a determination of the mass difference of the [Formula: see text] and [Formula: see text] mesons an explicit theoretical formula to be derived by an assumption of the CP-conservation has been used by CPLEAR Collaboration in a fitting of the time-dependent CPLEAR data on ASYMMETRY. So, in such procedure the mass difference [Formula: see text] of the [Formula: see text] and [Formula: see text] mesons has been found and in no case [Formula: see text] one as in this case the CP-violation has to be considered.

scholarly journals A TWO HIGGS BI-DOUBLET LEFT-RIGHT MODEL WITH SPONTANEOUS CP VIOLATION

2008 ◽  
Vol 23 (21) ◽  
pp. 3304-3308 ◽  
Author(s):  
YUE-LIANG WU ◽  
YU-FENG ZHOU
Keyword(s):  
Cp Violation ◽  
Mass Difference ◽  
Meson Mass ◽  
Symmetric Model ◽  
Family Symmetry ◽  
Cp Asymmetry ◽  
Ckm Matrix ◽  
K Meson ◽  
Flavor Changing ◽  
The Right

We discuss a left-right symmetric model with two Higgs bi-doublet and spontaneous P and CP violation. The flavor changing neutral currents is suppressed by assuming approximate global U(1) family symmetry. We calculate the constraints from neural K meson mass difference ΔmK and demonstrate that a right-handed gauge boson W2 contribution in box-diagrams with mass around 600 GeV is allowed due to a negative interference with a light charged Higgs boson around 150 ~ 300 GeV. The W2 contribution to ɛK is suppressed from appropriate choice of additional CP phases appearing in the right-handed Cabbibo-Kobayashi-Maskawa(CKM) matrix. The model is found fully consistent with B0 mass difference and the mixing-induced CP asymmetry measurements.

MEASUREMENT OF CP ASYMMETRY IN $B^0 \to f_0 K^0_S$, B0 → ϕK0 AND $B^0 \to K^+K^-K^0_S$ DECAYS

2005 ◽  
Vol 20 (15) ◽  
pp. 3531-3534
Author(s):  
◽  
PAUL E. KUTTER
Keyword(s):  
Maximum Likelihood ◽  
Cp Violation ◽  
B Meson ◽  
Time Dependent ◽  
Final States ◽  
Cp Asymmetry ◽  
Meson Factory ◽  
Babar Detector ◽  
Cp Asymmetries

We present results on time-dependent CP asymmetries in [Formula: see text] and B0 → K+K-K0. The measurements use a data sample consisting of approximately [Formula: see text] and 227(B0 → K+K-K0) million B-meson pairs recorded at the ϒ(4S) resonance with the BABAR detector at the PEP-II B-meson Factory at SLAC. From a time-dependent maximum likelihood fit, we measure for [Formula: see text]: the mixing-induced CP violation parameter [Formula: see text] and the direct CP violation parameter Cf0K = -0.24 ± 0.31 ( stat ) ± 0.15 ( syst ). From a simultaneous fit to [Formula: see text] and [Formula: see text] decays, we find: [Formula: see text] and CϕK = 0.00 ± 0.23 ( stat ) ± 0.05 ( syst ). For [Formula: see text] decays with [Formula: see text] decays excluded, we find: [Formula: see text] and [Formula: see text]. From the [Formula: see text] decays with [Formula: see text] decays excluded, we extract the fraction of CP-even final states from angular moments feven = 0.89 ± 0.08 ± 0.06.

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 CHARM MESON MIXING: AN EXPERIMENTAL REVIEW

2012 ◽  
Vol 27 (20) ◽  
pp. 1230019 ◽  
Author(s):  
CARLOS A. CHAVEZ ◽  
RAY F. COWAN ◽  
W. S. LOCKMAN
Keyword(s):  
Cp Violation ◽  
Experimental Results ◽  
Time Dependent ◽  
Experimental Techniques ◽  
Charm Meson ◽  
Decay Modes ◽  
Meson Mixing ◽  
Multi Body ◽  
Review Current ◽  
Charm Mixing

We review current experimental results on charm mixing and CP violation. We survey experimental techniques, including time-dependent, time-independent, and quantum-correlated measurements. We review techniques that use a slow pion tag from D*+→π+D0+ c.c. decays and those that do not, and cover two-body and multi-body D0 decay modes. We provide a summary of D-mixing results to date and comment on future experimental prospects at the LHC and other new or planned facilities.

scholarly journals Measurement of time-dependent CP violation parameters in B0→KS0KS0KS0 decays at Belle

2021 ◽  
Vol 103 (3) ◽  
Author(s):  
K. H. Kang ◽  
H. Park ◽  
T. Higuchi ◽  
K. Miyabayashi ◽  
K. Sumisawa ◽  
...  
Keyword(s):  
Cp Violation ◽  
Time Dependent

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.

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