Publication

Evidence of doubly OZI-suppressed decay ηc → ωϕ in the radiative decay J/ψ → γηc

2025

Abstract

Using a sample of (10087±44) × 106 J/ψ events collected with the BESIII detector at the BEPCII collider, the first evidence for the doubly Okubo-Zweig-Iizuka (OZI)-suppressed decay ηc → ωϕ is reported with a significance of 4.0σ. The branching fraction of ηc → ωϕ is measured to be B(ηc → ωϕ) = (3.86±0.92±0.62) × 10−5, where the first uncertainty is statistical and the second is systematic. This result provides valuable insights into the underlying mechanisms of charmonium decays, particularly for processes such as ηc → VV (where V represents a vector meson).

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2025

Abstract

Official source

Related concepts (18)

Vector meson

In high energy physics, a vector meson is a meson with total spin 1 and odd parity (usually noted as JP = 1−). Vector mesons have been seen in experiments since the 1960s, and are well known for their spectroscopic pattern of masses. The vector mesons contrast with the pseudovector mesons, which also have a total spin 1 but instead have even parity. The vector and pseudovector mesons are also dissimilar in that the spectroscopy of vector mesons tends to show nearly pure states of constituent quark flavors, whereas pseudovector mesons and scalar mesons tend to be expressed as composites of mixed states.

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.

Pseudovector meson

In high energy physics, a pseudovector meson or axial vector meson is a meson with total spin 1 and even parity (+) (usually noted as J^ P = 1^+ ). Compare to a vector meson, which has a total spin 1 and odd parity (that is, J^ P = 1^− ). The known pseudovector mesons fall into two different classes, all have even spatial parity ( P = "+" ), but they differ in another kind of parity called charge parity (C) which can be either even (+) or odd (−).

Related publications (5)

Evidence of doubly OZI-suppressed decay ηc → ωϕ in the radiative decay J/ψ → γηc

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