Göttingen 2025 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 69: Strong Interaction / QCD
T 69.5: Vortrag
Donnerstag, 3. April 2025, 17:15–17:30, VG 0.110
Angular analysis of J/ψ pair central exclusive production with the LHCb experiment — •Ilya Segal and Mikhail Mikhasenko — Ruhr University Bochum, Bochum, Germany
The analysis of the central exclusive production (CEP) provides possibilities to study quantum chromodynamics (QCD). Since the CEP of the double J/ψ system is dominantly carried out through the double pomeron exchange (DPE) mechanism, it can provide an understanding of the role of the pomeron in QCD. The comparison of inclusive and exclusive double J/ψ production mass spectra offers a probe into double parton scattering (DPS) effects, which are absent in exclusive processes. Previously, several intermediate states were observed in the double J/ψ spectrum, such as Tcccc tetraquark. The angular analysis can shed light on their quantum numbers. In this talk, the first results of the angular analysis based on the data sample of pp collisions collected by the LHCb experiment during Run 1 and Run 2 data-taking periods are presented.
In addition to this, work is done to improve the performance of the general-purpose Monte-Carlo generators such as Pythia, Herwig, etc. for the cases of the DPS and DPE. This can be done using the tuning procedures that involve the Rivet analysis preservation tool. The Rivet plugin is developed for the inclusive double J/ψ production previously measured by LHCb. The performance of this plugin for the test data is also presented in the talk.
Keywords: LHCb; Tetraquarks; Central exclusive production; multi-parton scattering; pomerons