3 years ago

Photoproduction of the P-wave excited $B_c^{**}$ meson at the LHeC.

Bi Huan-Yu, Ma Wen-Gan, He Kai, Li Xiao-Zhou, Zhang Ren-You

As an important sequential work of the S-wave $B_c^{(*)}$ ($^1S_0(^3S_1)$) meson production at the Large Hadron Electron Collider (LHeC), we investigate the production of the P-wave excited $B_c^{**}$ states ($^1P_1$ and $^3P_J$ with $J=0,1,2$) via photoproduction mechanism within the framework of nonrelativistic QCD (NRQCD) at the LHeC. Generally, the $e^-+P \to \gamma+ g \rightarrow B_c^{**} +b+ \bar{c}$ process is considered as the main production mechanism at an electron-proton collider due to the large luminosity of the gluon. However, according to our experience on the S-wave $B_c^{(*)}$ meson production at the LHeC, the extrinsic production mechanism, i.e., $e^-+P \to\gamma+c \rightarrow B_c^{**} +b$ and $e^-+P \to\gamma+\bar{b} \rightarrow B_c^{**}+\bar{c}$, could also provide dominating contributions at low $p_T$ region. A careful treatment between these channels is performed and the results on total and differential cross sections, together with main uncertainties are discussed. Taking the quark masses $m_b=4.90\pm0.40$ GeV and $m_c=1.50\pm0.20$ GeV into account and summing up all the production channels, we expect to accumulate $(2.48^{+3.45}_{-1.55}) \times 10^4$ $B_c^{**}({^{1}P_1})$, $(1.14^{+1.49}_{-0.82}) \times 10^4$ $B_c^{**}({^{3}P_0})$, $(2.38^{+3.39}_{-1.74}) \times 10^4$ $B_c^{**}({^{3}P_1})$ and $(5.59^{+7.84}_{-3.93}) \times 10^4$ $B_c^{**}({^{3}P_2})$ events at the $\sqrt{S}=1.30~\rm{TeV}$ LHeC in one operation year with luminosity ${\cal L}= 10^{33}$ cm$^{-2}$s$^{-1}$. With such sizable events, it is worth to study the properties of excited P-wave $B_c^{**}$ states at the LHeC.

Publisher URL: http://arxiv.org/abs/1710.11508

DOI: arXiv:1710.11508v1

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