Publication

Search for the radiative decay $ {D}_s^{+}\to \gamma {K}^{\ast }{(892)}^{+} $

2026

Abstract

Using 7.33 fb − 1 of e + e − collision data samples collected with the BESIII detector at center-of-mass energies between 4.128 and 4.226 GeV, we perform a search for the radiative decay ${D}_s^{+}\to \gamma {K}^{\ast }{(892)}^{+}$ via K * (892) + → K + π 0 and ${K}^{\ast }{(892)}^{+}\to {K}_S^0{\pi}^{+}$ for the first time. No significant signals are observed. The upper limit on the branching fraction of ${D}_s^{+}\to \gamma {K}^{\ast }{(892)}^{+}$ is set to be 2.3 × 10 − 4 at the 90% confidence level.

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2026

Abstract

Official source

Related concepts (12)

Invariant mass

The invariant mass, rest mass, intrinsic mass, proper mass, or in the case of bound systems simply mass, is the portion of the total mass of an object or system of objects that is independent of the overall motion of the system. More precisely, it is a characteristic of the system's total energy and momentum that is the same in all frames of reference related by Lorentz transformations. If a center-of-momentum frame exists for the system, then the invariant mass of a system is equal to its total mass in that "rest frame".

Mass in special relativity

The word "mass" has two meanings in special relativity: invariant mass (also called rest mass) is an invariant quantity which is the same for all observers in all reference frames, while the relativistic mass is dependent on the velocity of the observer. According to the concept of mass–energy equivalence, invariant mass is equivalent to rest energy, while relativistic mass is equivalent to relativistic energy (also called total energy).

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).

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Search for the radiative decay $ {D}_s^{+}\to \gamma {K}^{\ast }{(892)}^{+} $

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