论文标题
美元
$χ_{c1}$ and $χ_{c2}$ polarization as a probe of color octet channel
论文作者
论文摘要
我们分析了$χ_{C1} $和$χ_{C2} $极化的第一个LHC数据。我们描述了$ c \ bar c $与$ k_t $ fractorization方法的扰动生产，并使用非递归QCD形式主义来形成绑定状态。我们证明了$χ_{C1} $和$χ_{C2} $ MESON的极性各向异性对颜色八位位的贡献非常敏感。我们从第一个CMS极化参数上的第一个CMS极化测量％从$χ_{C1} $和$χ_{C2} $中提取长距离矩阵元素，$λ_θ^{χ_θ^{χ_{C1}}} $ $χ_{C1} $和$χ_{C2} $ transversement Momentum Distributions（及其比率）的LHC数据收集在$ \ sqrt s = 7 $ 〜tev。我们对$χ_{C1} $和$χ_{C2} $状态的不等颜色单线波函数的拟合点。
We analyze the first LHC data on $χ_{c1}$ and $χ_{c2}$ polarization obtained very recently by the CMS Collaboration at $\sqrt s = 8$~TeV. We describe the perturbative production of $c\bar c$ pair with $k_T$-factorization approach and use nonrelativistic QCD formalism for the formation of bound states. We demonstrate that the polar anisotropy of $χ_{c1}$ and $χ_{c2}$ mesons is strongly sensitive to the color octet contributions. We extract the long-distance matrix elements for $χ_{c1}$ and $χ_{c2}$ mesons from the first CMS polarization measurement %on the polarization parameters $λ_θ^{χ_{c1}}$ and $λ_θ^{χ_{c2}}$ obtained at $\sqrt s = 8$~TeV together with available LHC data on the $χ_{c1}$ and $χ_{c2}$ transverse momentum distributions (and their ratios) collected at $\sqrt s = 7$~TeV. Our fit points to unequal color singlet wave functions of $χ_{c1}$ and $χ_{c2}$ states.
