Publication

Search for η1(1855) in XcJ → ηηη′ decays

2025

Abstract

Based on a sample of 2.7 × 109 Φ(3686) events collected by the BESIII detector operating at the BEP- CII collider, the decay Φ(3686) → γχcJ, χcJ → ηηη′ is analyzed. The decay modes χc1 and χc2 → ηηη′ are observed for the first time, and their corresponding branching fractions are determined to be ℬ(χc1 → ηηη′)= (1.40±0.13(stat.)±0.09(sys.))× 10-4 and ℬ(χc2 → ηηη′) = (4.18 ± 0.84(stat.) ± 0.48(sys.))× 10-5. An upper limit on the branching fraction of χc0 → ηηη′ set as 2.59 × 10-5 at a 90% confidence level (CL). A partial wave analysis (PWA) of the decay χc1 → ηηη′ is performed to search for the 1-+ exotic state 771 (1855). The PWA result indieates that the structure in the ηη′ mass spectrum is attributed to f0(1500), while in the ηη mass spectrum, it is attributed to the 0++ phase space. The upper limit of ℬ(χc1 → η1 (1855)η)·ℬ(η1(1855) ηη′)

Official source

https://infoscience.epfl.ch/entities/publication/b758f38d-4fa7-4cab-9641-dee6856e47ef

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2025

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/b758f38d-4fa7-4cab-9641-dee6856e47ef

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Related concepts (31)

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.

Determinacy

Determinacy is a subfield of set theory, a branch of mathematics, that examines the conditions under which one or the other player of a game has a winning strategy, and the consequences of the existence of such strategies. Alternatively and similarly, "determinacy" is the property of a game whereby such a strategy exists. Determinacy was introduced by Gale and Stewart in 1950, under the name "determinateness". The games studied in set theory are usually Gale–Stewart games—two-player games of perfect information in which the players make an infinite sequence of moves and there are no draws.

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