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Publication

Measurement of the CP violation parameter AG in D-0 K+ K and D-0 pi(+) pi(-) decays

Pietro Marino
2019
Journal Articles

Abstract

.Asymmetries in the time-dependent rates of singly Cabibbo-suppressed D0K+K- and D0+- decays are measured in pp collision data sample collected with the LHCb detector during LHC Run 1, corresponding to an integrated luminosity of 3 fb(-1). The asymmetries in effective decay widths between D-0 and D0 decays, sensitive to indirect CP violation, are measured. These measurements show no evidence for CP violation and improve on the precision of the previous best measurements by nearly a factor of two.

Official source

https://infoscience.epfl.ch/entities/publication/5e0d7e9f-62b9-4262-8c34-4b84d9f5f43a

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Pietro Marino
2019
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/5e0d7e9f-62b9-4262-8c34-4b84d9f5f43a

About this result

Related concepts (23)

CP violation

In particle physics, CP violation is a violation of CP-symmetry (or charge conjugation parity symmetry): the combination of C-symmetry (charge symmetry) and P-symmetry (parity symmetry). CP-symmetry states that the laws of physics should be the same if a particle is interchanged with its antiparticle (C-symmetry) while its spatial coordinates are inverted ("mirror" or P-symmetry). The discovery of CP violation in 1964 in the decays of neutral kaons resulted in the Nobel Prize in Physics in 1980 for its discoverers James Cronin and Val Fitch.

Radioactive decay

Radioactive decay (also known as nuclear decay, radioactivity, radioactive disintegration, or nuclear disintegration) is the process by which an unstable atomic nucleus loses energy by radiation. A material containing unstable nuclei is considered radioactive. Three of the most common types of decay are alpha, beta, and gamma decay, all of which involve emitting particles. The weak force is the mechanism that is responsible for beta decay, while the other two are governed by the electromagnetism and nuclear force.

LHCb experiment

The LHCb (Large Hadron Collider beauty) experiment is a particle physics detector experiment collecting data at the Large Hadron Collider at CERN. LHCb is a specialized b-physics experiment, designed primarily to measure the parameters of CP violation in the interactions of b-hadrons (heavy particles containing a bottom quark). Such studies can help to explain the matter-antimatter asymmetry of the Universe. The detector is also able to perform measurements of production cross sections, exotic hadron spectroscopy, charm physics and electroweak physics in the forward region.

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