Publication

Novel measurement of the strong-phase difference between D0 → K− π+ and D0 → K− π+ decays using C-even and C-odd quantum-correlated DD pairs

2025

Abstract

A novel measurement technique of strong-phase differences between the decay amplitudes of D0 and D0 mesons is introduced which exploits quantum-correlated DD pairs produced by e+e−collisions at energies above the ψ(3770) production threshold, where DD pairs are produced in both even and odd eigenstates of the charge-conjugation symmetry. Employing this technique, the first determination of a D0–D0 relative strong phase is reported with such data samples. The strong-phase difference between D0 → K−π+ and D0 → K−π+ decays, δDK π, is measured to be δDK π = (192.8+11.0+1.9-12.4-2.4)°, using a dataset corresponding to an integrated luminosity of 7.13 fb−1 collected at center-of-mass energies between 4.13–4.23 GeV by the BESIII experiment.

Official source

https://infoscience.epfl.ch/entities/publication/f17ee2a3-1ddc-456f-8f12-b3656b86feca

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2025

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/f17ee2a3-1ddc-456f-8f12-b3656b86feca

About this result

Related concepts (32)

Meson

In particle physics, a meson (ˈmiːzɒn,_ˈmɛzɒn) is a type of hadronic subatomic particle composed of an equal number of quarks and antiquarks, usually one of each, bound together by the strong interaction. Because mesons are composed of quark subparticles, they have a meaningful physical size, a diameter of roughly one femtometre (10^−15 m), which is about 0.6 times the size of a proton or neutron. All mesons are unstable, with the longest-lived lasting for only a few tenths of a nanosecond.

C-symmetry

In physics, charge conjugation is a transformation that switches all particles with their corresponding antiparticles, thus changing the sign of all charges: not only electric charge but also the charges relevant to other forces. The term C-symmetry is an abbreviation of the phrase "charge conjugation symmetry", and is used in discussions of the symmetry of physical laws under charge-conjugation. Other important discrete symmetries are P-symmetry (parity) and T-symmetry (time reversal).

Beta decay

In nuclear physics, beta decay (β-decay) is a type of radioactive decay in which an atomic nucleus emits a beta particle (fast energetic electron or positron), transforming into an isobar of that nuclide. For example, beta decay of a neutron transforms it into a proton by the emission of an electron accompanied by an antineutrino; or, conversely a proton is converted into a neutron by the emission of a positron with a neutrino in so-called positron emission.

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Novel measurement of the strong-phase difference between D0 → K− π+ and D0 → K− π+ decays using C-even and C-odd quantum-correlated DD pairs

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