Publication

Search for a 1- + Molecular State Via e+e- →γds+ ds1- (2536) + C.c.

2025

Abstract

We search, for the first time, for an exotic molecular state with quantum numbers JPC = 1(-+), called X, via the process e(+)e(-) -> gamma D-s(+) D-s1(-) (2536) + c.c. using data samples corresponding to a luminosity of 5.8 fb(-1) across center-of-mass energies from 4.612 to 4.951 GeV, collected with the BESIII detector operating at the BEPCII Collider. No statistically significant signal is observed. The upper limits on the product of cross section and branching fraction sigma(e(+)e(-) -> gamma X) . B(X -> D-s(+) D-s1(-) (2536) + c.c.) at 90% confidence level are reported for each energy point, assuming the X mass to be 4.503 GeV/c(2) and the width 25, 50, 75, and 100 MeV, respectively.

Official source

https://infoscience.epfl.ch/entities/publication/1b143df0-0a39-4f09-8404-0519975bde64

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2025

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/1b143df0-0a39-4f09-8404-0519975bde64

About this result

Related concepts (32)

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).

Related publications (2)

Search for a 1<sup>- +</sup> Molecular State Via <i>e</i><sup>+</sup><i>e</i><sup>-</sup> →γ<i>d</i><sub>s</sub><sup>+</sup> <i>d</i><sub>s1</sub><sup>-</sup> (2536) + C.c.

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Observation of D+→KS0π0μ+νμ, Test of Lepton Flavor Universality, and First Angular Analysis of D+ → K ¯∗(892)0ℓ+νℓ

New perspectives on the performance of machine learning classifiers for mode-choice prediction