Publication

Partial wave analysis of e+e− → π+π+ J/ψ and cross section measurement of e+e+ → π±Zc(3900)∓ from 4.1271 to 4.3583 GeV

2025

Abstract

Based on 12.0 fb−1 of e+e− collision data samples collected by the BESIII detector at center-of-mass energies from 4.1271 to 4.3583 GeV, a partial wave analysis is performed for the process e+e− → π+π−J/ψ. The cross sections for the subprocesses e+e− → π+Zc(3900)− + c.c. → π+π−J/ψ, f0 (980)(→ π+π-)J/ψ, and (π+π-)S-waveJ/ψ are measured for the first time. The mass and width of the Zc(3900)± are determined to be 3884.6 ± 0.7 ± 3.3 MeV/c2 and 37.2 ± 1.3 ± 6.6 MeV, respectively. The first errors are statistical and the second systematic. The final state (π+π-)S-waveJ/ψ dominates the process e+e- → π+π-J/ψ. By analyzing the cross sections of π±Zc(3900)∓ and f0(980)J/ψ, Y(4220) has been observed. Its mass and width are determined to be 4225.7 ± 4.1 ± 3.4 MeV/c2 and 57.5 ± 9.4 ± 12.1 MeV, respectively.

Official source

https://infoscience.epfl.ch/entities/publication/93733a62-3489-4cd2-aa44-f84dd5ccc66a

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2025

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/93733a62-3489-4cd2-aa44-f84dd5ccc66a

About this result

Related concepts (21)

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

Mass is an intrinsic property of a body. It was traditionally believed to be related to the quantity of matter in a physical body, until the discovery of the atom and particle physics. It was found that different atoms and different elementary particles, theoretically with the same amount of matter, have nonetheless different masses. Mass in modern physics has multiple definitions which are conceptually distinct, but physically equivalent.

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).

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Partial wave analysis of e+e− → π+π+ J/ψ and cross section measurement of e+e+ → π±Zc(3900)∓ from 4.1271 to 4.3583 GeV

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