Publication

Search for J/ψ → K0SK0S and ψ(3686) → K0SK0S

2025

Abstract

Using data samples of (10087 ± 44) × 106 J/ψ events and (2712.4 ± 14.3) × 106 ψ(3686) events collected with the BESIII detector at the BEPCII collider, we search for the CP violating decays J/ψ → K0SK0S and ψ(3686) → K0SK0S. No significant signals are observed over the expected background yields. The upper limits on their branching fractions are set as B(J/ψ → K0SK0S) < 4.7 × 10−9 and B(ψ(3686) → K0SK0S) < 1.1 × 10−8 at the 90% confidence level. These results improve the previous limits by a factor of three for J/ψ → K0SK0S and two orders of magnitude for ψ(3686) → K0SK0S.

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2025

Abstract

Official source

Related concepts (32)

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.

Set theory

Set theory is the branch of mathematical logic that studies sets, which can be informally described as collections of objects. Although objects of any kind can be collected into a set, set theory, as a branch of mathematics, is mostly concerned with those that are relevant to mathematics as a whole. The modern study of set theory was initiated by the German mathematicians Richard Dedekind and Georg Cantor in the 1870s. In particular, Georg Cantor is commonly considered the founder of set theory.

Set (mathematics)

A set is the mathematical model for a collection of different things; a set contains elements or members, which can be mathematical objects of any kind: numbers, symbols, points in space, lines, other geometrical shapes, variables, or even other sets. The set with no element is the empty set; a set with a single element is a singleton. A set may have a finite number of elements or be an infinite set. Two sets are equal if they have precisely the same elements. Sets are ubiquitous in modern mathematics.

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