Measurement of the Mass Difference Between Neutral Charm-Meson Eigenstates.

08:00 EDT 14th June 2019 | BioPortfolio

Summary of "Measurement of the Mass Difference Between Neutral Charm-Meson Eigenstates."

We report a measurement of the mass difference between neutral charm-meson eigenstates using a novel approach that enhances sensitivity to this parameter. We use 2.3×10^{6} D^{0}→K_{S}^{0}π^{+}π^{-} decays reconstructed in proton-proton collisions collected by the LHCb experiment in 2011 and 2012. Allowing for CP violation in mixing and in the interference between mixing and decay, we measure the CP-averaged normalized mass difference x_{CP}=[2.7±1.6(stat)±0.4(syst)]×10^{-3} and the CP-violating parameter Δx=[-0.53±0.70(stat)±0.22(syst)]×10^{-3}. The results are consistent with CP symmetry. These determinations are the most precise from a single experiment and, combined with current world-average results, yield the first evidence that the masses of the neutral charm-meson eigenstates differ.


Journal Details

This article was published in the following journal.

Name: Physical review letters
ISSN: 1079-7114
Pages: 231802


DeepDyve research library

PubMed Articles [11840 Associated PubMed Articles listed on BioPortfolio]

Measurement of the Charm-Mixing Parameter y_{CP}.

A measurement of the charm-mixing parameter y_{CP} using D^{0}→K^{+}K^{-}, D^{0}→π^{+}π^{-}, and D^{0}→K^{-}π^{+} decays is reported. The D^{0} mesons are required to originate from semimuoni...

First Measurement of Charm Production in its Fixed-Target Configuration at the LHC.

The first measurement of heavy-flavor production by the LHCb experiment in its fixed-target mode is presented. The production of J/ψ and D^{0} mesons is studied with beams of protons of different ene...

Observation of Two Excited B_{c}^{+} States and Measurement of the B_{c}^{+}(2S) Mass in pp Collisions at sqrts=13  TeV.

Signals consistent with the B_{c}^{+}(2S) and B_{c}^{*+}(2S) states are observed in proton-proton collisions at sqrt[s]=13  TeV, in an event sample corresponding to an integrated luminosity of 143...

Nonthermal States Arising from Confinement in One and Two Dimensions.

We show that confinement in the quantum Ising model leads to nonthermal eigenstates, in both continuum and lattice theories, in both one (1D) and two dimensions (2D). In the ordered phase, the presenc...

Comparison of Accuracy of Subjective Measurement of Tip-Supra Tip Difference During Rhinoplasty Between Plastic Surgeons.

This study compared the subjective measurement of difference between the nasal tip and supra tip (TSD) (using eyes) versus objective measurement of TSD (by a ruler) during rhinoplastic surgery to dete...

Clinical Trials [5025 Associated Clinical Trials listed on BioPortfolio]

Children's Automated Respiration Monitor (ChARM) for Child Pneumonia Diagnosis by Community Health Workers in Mali

The primary objective of this study is to estimate the impact of a self-monitoring tool (ChARM), used as a teaching/monitoring device, on the CHWs respiratory rate counting accuracy when a...

Arm and Finger Measurement for Blood Pressure Surveillance

Accurate blood pressure (BP) measurement is critical in peripartum care. The cuff and bladder sizes affects the accuracy of BP measurement. Current international BP measurement recommendat...

Z-Joint Changes in Low Back Pain Following Adjusting

The purpose of this continuation project is to use MRI to evaluate gapping of the zygapophysial (Z) joints following side-posture positioning and side-posture spinal adjusting in subjects ...

E-T Tube Cuff Pressure Change After Changing Position From Neutral to Hyperextension of Neck

This study evaluates difference of the endotracheal tube cuff pressure between a tapered- versus a cylindrical- shaped cuff after changing from neutral to hyperextension of neck. Fifty pa...

LC-MS/MS 25(OH)D Status in a Large Cohort

The present study assessed serum 25(OH)D in a cohort of 74235 outpatients by liquid-chromatography-tandem-mass-spectrometry (LC-MS/MS). The investigators studied the distribution of serum...

Medical and Biotech [MESH] Definitions

A mass spectrometry technique using two (MS/MS) or more mass analyzers. With two in tandem, the precursor ions are mass-selected by a first mass analyzer, and focused into a collision region where they are then fragmented into product ions which are then characterized by a second mass analyzer. A variety of techniques are used to separate the compounds, ionize them, and introduce them to the first mass analyzer. For example, for in GC-MS/MS, GAS CHROMATOGRAPHY-MASS SPECTROMETRY is involved in separating relatively small compounds by GAS CHROMATOGRAPHY prior to injecting them into an ionization chamber for the mass selection.

An analytical method used in determining the identity of a chemical based on its mass using mass analyzers/mass spectrometers.

The measurement of an organ in volume, mass, or heaviness.

A ceramidase subtype that is active at neutral pH. It is found at high levels within the SMALL INTESTINE and in the BRAIN.

Amino acid transporter systems capable of transporting neutral amino acids (AMINO ACIDS, NEUTRAL).

Quick Search


DeepDyve research library

Searches Linking to this Article