Publication

Measurements of the Cross Sections of E + E - → Σcσc and Λc + Σc- Near Kinematic Thresholds

2025

Abstract

Based on e(+) e(-) annihilation data collected with the BESIII detector at the BEPCII collider, searches for the e(+)e(-) -> Sigma(c)Sigma(c) (Sigma(+)(c)Sigma(-)(c), Sigma(0)(c)Sigma(0)(c), and Sigma(++)(c)Sigma(--)(c)) processes, as well as for the process e(+)e(-) -> Lambda(+)(c)Sigma(-)(c), are conducted for the first time at root s = 4.750, 4.781, 4.843, 4.918, and 4.951 GeV. As no signals are observed for all the above channels, the upper limits on their Born cross sections at the 90% confidence level are reported. The obtained upper limits of cross sections for e(+)e(-) -> Sigma(c)Sigma(c) are more than 2 orders of magnitude smaller than those for e(+)e(-) -> Lambda(+)(c)Lambda(-)(c) near the threshold. In contrast, such suppression is absent in hyperon pair production (e(+)e(-) -> Lambda Lambda and Sigma Sigma), suggesting distinct underlying dynamics in charmed baryon production.

Official source

https://infoscience.epfl.ch/entities/publication/c39613d4-6b2d-4331-8962-d408b0de3b9f

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2025

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/c39613d4-6b2d-4331-8962-d408b0de3b9f

About this result

Related concepts (30)

Charm quark

The charm quark, charmed quark, or c quark is an elementary particle of the second generation. It is the third-most massive quark, with a mass of 1.27GeV/c2 (as measured in 2022) and a charge of +2/3 e. It carries charm, a quantum number. Charm quarks are found in various hadrons, such as the J/psi meson and the charmed baryons. There are also several bosons, including the W and Z bosons and the Higgs boson, that can decay into charm quarks.

Hypernucleus

A hypernucleus is similar to a conventional atomic nucleus, but contains at least one hyperon in addition to the normal protons and neutrons. Hyperons are a category of baryon particles that carry non-zero strangeness quantum number, which is conserved by the strong and electromagnetic interactions. A variety of reactions give access to depositing one or more units of strangeness in a nucleus. Hypernuclei containing the lightest hyperon, the lambda (Λ), tend to be more tightly bound than normal nuclei, though they can decay via the weak force with a mean lifetime of around 200ps.

Magnitude (astronomy)

In astronomy, magnitude is measure of the brightness of an object, usually in a defined passband. An imprecise but systematic determination of the magnitude of objects was introduced in ancient times by Hipparchus. Magnitude values do not have a unit. The scale is logarithmic and defined such that a magnitude 1 star is exactly 100 times brighter than a magnitude 6 star. Thus each step of one magnitude is times brighter than the magnitude 1 higher.

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