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The Color-Octet Contributions to $P$-wave $B_c$ Meson Hadroproduction | | Chao-Hsi Chang
; Cong-Feng Qiao
; Jian-Xiong Wang
; Xing-Gang Wu
; | | Date: |
17 Feb 2005 | | Journal: | Phys.Rev. D71 (2005) 074012 | | Subject: | hep-ph | | Abstract: | The contributions from the color-octet components $|(car b)_{f 8}(^{1}S_{0}) g>$ and $|(car b)_{f 8}(^{3}S_{1}) g>$ 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, $|(car b)_{f 1}(^{1}P_{1})>$ and $|(car b)_{f 1}(^{3}P_{J})>$ ($J=1,2,3$). 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. | | Source: | arXiv, hep-ph/0502155 | | Services: | Forum | Review | PDF | Favorites | |
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