Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2005-02-17
Phys.Rev.D71:074012,2005
Physics
High Energy Physics
High Energy Physics - Phenomenology
14 pages, 4 figures (8 eps-files for figures), add references and correct typos
Scientific paper
10.1103/PhysRevD.71.074012
The contributions from the color-octet components $|(c\bar b)_{\bf 8}(^{1}S_{0}) g>$ and $|(c\bar b)_{\bf 8}(^{3}S_{1}) g>$ to the $h_{B_c}$ or $\chi_{B_c}^J$ (the $P$-wave $B_c$ meson) hadroproduction are estimated in terms of the complete ${\cal O}(\alpha_s^4)$ calculation. As necessary inputs in the estimate, we take the values of the octet matrix elements according to the NRQCD scaling rules, and as a result, we have found that the contributions to the $P$-wave production may be the same in order of magnitude as those from the color-singlet ones, $|(c\bar b)_{\bf 1}(^{1}P_{1})>$ and $|(c\bar b)_{\bf 1}(^{3}P_{J})>$ ($J=1,2,3$). Especially, our result indicates that the observation of the color-octet contributions to the $P$-wave production in the low transverse momentum region is not very far from the present experimental capability at Tevatron and LHC.
Chang Chao-Hsi
Qiao Cong-Feng
Wang Jian-Xiong
Wu Xing-Gang
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