Production and polarization of prompt ϒ(nS) in the improved color evaporation model using the kT -factorization approach
Production and polarization of prompt ϒ(nS) in the improved color evaporation model using the kT -factorization approach
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DOI：
10.1103/physrevd.99.034007
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发表时间：
2018-11
影响因子：
5
通讯作者：
Vincent Cheung;R. Vogt
中科院分区：
文献类型：
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作者：
Vincent Cheung;R. Vogt
采用kT-因子分解方法计算了改进的色蒸发模型中首阶瞬发荧光（nS）产生的偏振态。我们给出了p+p和p+p <$碰撞中瞬发粒子的偏振参数λ_n（nS）作为横动量的函数，并与螺旋度、Collins-Soper和Gottfried-Jackson框架中的数据进行了比较.我们还提出了计算的bottomonium生产横截面的横动量和快度的函数。这是第一个pT依赖的计算bottomonium生产和偏振的改进的颜色蒸发模型。我们发现协议与bottomonium截面和偏振测量。
We calculate the polarization of prompt ϒ(nS) production in the improved color evaporation model at leading order employing the kT-factorization approach. We present the polarization parameter λϑ of prompt ϒ(nS) as a function of transverse momentum in p+p and p+p¯ collisions to compare with data in the helicity, Collins-Soper and Gottfried-Jackson frames. We also present calculations of the bottomonium production cross sections as a function of transverse momentum and rapidity. This is the first pT-dependent calculation of bottomonium production and polarization in the improved color evaporation model. We find agreement with both bottomonium cross sections and polarization measurements.