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arXiv 0704.0638hep-ex
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在1.96 TeV的ppbar碰撞中产生的J/psi和psi(2S)介子的极化

Polarizations of J/psi and psi(2S) Mesons Produced in ppbar Collisions at 1.96 TeV

CDF Collaboration

摘要:

我们用$\pt \geq 5 \pgev$在$|y|<0.6$快度范围内测量了$\jpsi$和$\psiprime$介子的极化随其横动量$\pt$的变化。使用CDF II检测器收集的积分亮度约为$800 \ipb$的数据样本进行分析。对于这两种矢量介子,我们发现随着$\pt$从5增加到$30 \pgev$,极化变得越来越纵向。这些结果相比,非相对论量子色动力学和其他当代模型的预测。本文还报道了由$B$ -强子衰变产生的$\jpsi$和$\psiprime$介子的有效极化。

英文摘要:

We have measured the polarizations of $\jpsi$ and $\psiprime$ mesons as functions of their transverse momentum $\pt$ when they are produced promptly in the rapidity range $|y|<0.6$ with $\pt \geq 5 \pgev$. The analysis is performed using a data sample with an integrated luminosity of about $800 \ipb$ collected by the CDF II detector. For both vector mesons, we find that the polarizations become increasingly longitudinal as $\pt$ increases from 5 to $30 \pgev$. These results are compared to the predictions of nonrelativistic quantum chromodynamics and other contemporary models. The effective polarizations of $\jpsi$ and $\psiprime$ mesons from $B$-hadron decays are also reported.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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