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February 28, 2024 to March 6, 2024
HSE Study Center “Voronovo”
Europe/Moscow timezone

Spin-parity measurement of J/psi J/psi structures

Mar 5, 2024, 6:18 PM
12m
HSE Study Center “Voronovo”

HSE Study Center “Voronovo”

Voronovskoe, Moscow Russian Federation
Talk (10+2 min) Young Scientist Forum Young Scientist Forum

Speaker

Xining Wang

Description

The CMS, LHCb, and ATLAS experiments have observed up to three resonances in
the X → J/ψ J/ψ → 4µ decay channel in the invariant mass spectrum between 6 and 8 GeV. These resonances are candidates for ccc¯ c¯ tetra-quark states. In order to study this hypothesis, and to understand the nature of these resonances, we perform a spin-parity study using kinematic distributions of the four muons. A matrix-element approach is employed to create optimal discriminants to distinguish pairs of hypotheses from the list of J P = 0+, 0−, 1+, 1−, 2+, 2−, where both gluon fusion and quark-antiquark production mechanisms are considered. The results of this study are presented using the full Run-2 dataset from the CMS experiment.

Primary author

Xining Wang

Presentation materials