QCD radiative corrections to $\chi_{cJ}$ production at hadron colliders
By Yan-Qing Ma, Kai Wang, K. Chao. 2010
137 citations recorded by the source corpus.
To clarify the outstanding problem in charmonium production that existing theories cannot explain the observed cross sections of $\chi_{cJ}$ (J=0,1,2) and ratio $R_{\chi_c}=\sigma_{\chi_{c2}}/\sigma_{\chi_{c1}}\approx 0.75$ (in contrast to the spin counting value 5/3) at the Tevatron, we study the complete next-to-leading order radiative corrections in nonrelativistic QCD, and find next-to-leading order contributions of $^3P_J^{[1]}$ are more important than leading order at high $p_T$, and $^3P_1^{[1]}$ decreases slower than $^3P_2^{[1]}$, implying a natural explanation for the $R_{\chi_c}$ puzzle. By fitting $R_{\chi_c}$, the predicted cross sections of $\chi_{cJ}$ are found to agree with data. The result indicates color-octet contribution is crucially needed, thus providing a unique test for heavy quarkonium production mechanisms. Feed-down contributions of $\chi_{cJ}$ to prompt $J/\psi$ production are estimated to be substantial, about $30-40%$ at $p_T=20$ GeV. Production of $\chi_{cJ}$ (J=0,1,2) at the LHC is also predicted.
Subfields: Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/3c64b259be79428a4faf8f213ec24f57fb0051f6
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In Nuclear and High Energy Physics
Citations in the corpus
- Multiquark Resonances (2016, methodology): “The authors use the Non-Relativistic QCD (NRQCD) approach [42] at Next-to-Leading Order (NLO), which has proven to be quite successful in reproducing the yields of J/ψ [43] and χcJ(1P) [44] at Tevatron and LHC.”