Publication

First Measurement of the Ds+ →K0μ+νμ Decay

2026

Abstract

We report the first measurement of the semileptonic decay Ds+→K0μ+νμ, using a sample of e+e- annihilation data corresponding to an integrated luminosity of 7.33 fb-1 collected at center-of-mass energies between 4.128 and 4.226 GeV with the BESIII detector at the BEPCII collider. The branching fraction of the decay is measured to be B(Ds+→K0μ+νμ)=(2.89±0.27stat±0.12syst)×10-3, where the first uncertainty is statistical and the second is systematic. Based on a simultaneous fit to the partial decay rates in q2 intervals measured in Ds+→K0μ+νμ and Ds+→K0e+νe decays, the product value of the form factor f+K0(0) and the Cabibbo-Kobayashi-Maskawa matrix element |Vcd| is measured to be f+K0(0)|Vcd|=0.140±0.008stat±0.003syst, which is the most precise determination to date. In addition, lepton flavor universality is tested for the first time with Ds+→K0ℓ+νℓ decays in full and separate q2 intervals. No violation is found.

Official source

https://infoscience.epfl.ch/entities/publication/2cea5d7e-ddd1-47d6-a770-37c547fac6d9

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2026

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/2cea5d7e-ddd1-47d6-a770-37c547fac6d9

About this result

Related concepts (32)

Branching fraction

In particle physics and nuclear physics, the branching fraction (or branching ratio) for a decay is the fraction of particles which decay by an individual decay mode or with respect to the total number of particles which decay. It applies to either the radioactive decay of atoms or the decay of elementary particles. It is equal to the ratio of the partial decay constant to the overall decay constant. Sometimes a partial half-life is given, but this term is misleading; due to competing modes, it is not true that half of the particles will decay through a particular decay mode after its partial half-life.

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.

Spacetime

In physics, spacetime is any mathematical model that fuses the three dimensions of space and the one dimension of time into a single four-dimensional continuum. Spacetime diagrams are useful in visualizing and understanding relativistic effects such as how different observers perceive where and when events occur. Until the turn of the 20th century, the assumption had been that the three-dimensional geometry of the universe (its description in terms of locations, shapes, distances, and directions) was distinct from time (the measurement of when events occur within the universe).

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First Measurement of the Ds+ →K0μ+νμ Decay

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