Towards higher-order calculations of quarkonia production with $$k_T$$ k T -factorization: P-wave charmonia
Abstract Inclusive P-wave charmonia production in hadronic collisions at high energies is discussed in the framework of non-relativistic QCD and $$k_T$$ k T -factorization formalism. We present two consistent approaches to merge the usual leading order $$k_T$$ k T -factorization calculations with tr...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
SpringerOpen
2024-04-01
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| Series: | European Physical Journal C: Particles and Fields |
| Online Access: | https://doi.org/10.1140/epjc/s10052-024-12690-0 |
| Summary: | Abstract Inclusive P-wave charmonia production in hadronic collisions at high energies is discussed in the framework of non-relativistic QCD and $$k_T$$ k T -factorization formalism. We present two consistent approaches to merge the usual leading order $$k_T$$ k T -factorization calculations with tree-level next-to-leading order off-shell amplitudes. Using these prescriptions, we extracted long-distance matrix elements for $$\chi _c$$ χ c mesons from a combined fit to available Tevatron and LHC data. In contrast to previous (leading order) calculations, our fits do not rule out the equalness of the color singlet wave functions of $$\chi _{c1}$$ χ c 1 and $$\chi _{c2}$$ χ c 2 states. The extracted values of long-distance matrix elements are employed to analyse the $$\chi _c$$ χ c polarization data reported recently by the CMS Collaboration. Our predictions are in a reasonably good agreement with the Tevatron and LHC measurements within the theoretical and experimental uncertainties. |
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| ISSN: | 1434-6052 |