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Measurement of the longitudinal polarization in decays

Physical Review D - Particles, Fields, Gravitation and Cosmology. 2024. Vol. 110. No. 9. Article 092007.
Aaij R., Abdelmotteleb A. S., Abellan Beteta C., Abudinén F., Ackernley T., Bocharnikov V., Boldyrev A., Hushchyn M., Ratnikov F., Ryzhikov A.

The longitudinal polarization fraction of the meson is measured in decays, where the lepton decays to three charged pions and a neutrino, using proton-proton collision data collected by the LHCb experiment at center-of-mass energies of 7, 8 and 13 TeV and corresponding to an integrated luminosity of . The polarization fraction is measured in two regions, below and above , where is defined as the squared invariant mass of the system. The values are measured to be and for the lower and higher regions, respectively. The first uncertainties are statistical and the second systematic. The average value over the whole range is . These results are compatible with the Standard Model predictions.

Research target: Computer Science
Language: English
DOI
Keywords: polarizationновая физикаLeptonsанализ данных и искусственный интеллектHadron collidersParticle decaysглубокое машинное обучениеParticle interactionsQuarks
Publication based on the results of:
Neuromorphic optimization of complex experimental setups at dynamically changing quality metrics and boundary conditions (2024)
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