Publication

Precise Measurement of the Form Factors in d0 → k* (892)- Μ+ Νμ, and Test of Lepton Universality with d0 → k* (892)- L+νl Decays

2025

Abstract

We report a study of the semileptonic decay D-0 -> (K) over bar (0) pi(-) mu(+) nu(mu) based on a sample of 7.9 fb(-1) of ethorneannihilation data collected at a center-of-mass energy of 3.773 GeV with the BESIII detector at the BEPCII collider. The branching fraction of the decay is measured for the first time to be B(D-0 -> (K) over bar (0) pi(-) mu(+) nu(mu)) = (1.373 +/- 0.020(stat) +/- 0.023(syst))%, where the first uncertainty is statistical and the second is systematic. Based on the investigation of the decay dynamics, we find that the decay is dominated by the K* (892)(-) resonance with the branching fraction measured to be B(D-0 -> (K) over bar (0) pi(-) mu(+) nu(mu)) = (1.948 +/- 0.033(stat) +/- 0.036(syst))%. We also determine the hadronic form factors for the D-0 -> (K) over bar (0) pi(-) mu(+) nu(mu) decay to be r(V) = V(0)=A(1)(0) = 1.46 +/- 0.11(stat) +/- 0.04(syst), r(2) = A(2)(0)/A(1)(0) = 0.71 +/- 0.08(stat) +/- 0.03(syst), and A(1)(0) = 0.609 +/- 0.008(stat) +/- 0.008(syst), where V(0) is the vector form factor and A(1,2)(0) are the axial-vector form factors evaluated at q(2) = 0. The A1(0) is measured for the first time in D-0 -> (K) over bar (0) pi(-) mu(+) nu(mu) decay. Averaging the form factor parameters that we reported previously in D-0 -> K* (892)(-) (-> (K) over bar (0) pi(-))e+ nu(e) and D-0 -> (K) over bar (892)(-) (-> K- pi(0))mu(+)nu(mu) decays, we obtain V-r = 1.456 +/- 0.040(stat) +/- 0.016(syst), r(2) = 0.715 +/- 0.031(stat) +/- 0.014stat, and A1(0) = 0.614 +/- 0.005(stat) +/- 0.004(syst). This is the most precise determination of the form factor parameters to date measured in D -> K* (892) transitions, which provide the most stringent test on various theoretical models.

Official source

https://infoscience.epfl.ch/entities/publication/22af64d7-2067-4083-8755-cbf6d5500e57

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2025

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/22af64d7-2067-4083-8755-cbf6d5500e57

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.

Mass–energy equivalence

In physics, mass–energy equivalence is the relationship between mass and energy in a system's rest frame, where the two quantities differ only by a multiplicative constant and the units of measurement. The principle is described by the physicist Albert Einstein's formula: . In a reference frame where the system is moving, its relativistic energy and relativistic mass (instead of rest mass) obey the same formula. The formula defines the energy E of a particle in its rest frame as the product of mass (m) with the speed of light squared (c2).

K–Ar dating

Potassium–argon dating, abbreviated K–Ar dating, is a radiometric dating method used in geochronology and archaeology. It is based on measurement of the product of the radioactive decay of an isotope of potassium (K) into argon (Ar). Potassium is a common element found in many materials, such as feldspars, micas, clay minerals, tephra, and evaporites. In these materials, the decay product is able to escape the liquid (molten) rock, but starts to accumulate when the rock solidifies (recrystallizes).

Related publications (17)

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