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arXiv 0811.2820hep-ex
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s**(1/2)=1.96$-kT的ppbar碰撞喷流中粒子分布的测量

Measurement of the kT Distribution of Particles in Jets Produced in ppbar Collisions at s**(1/2)=1.96$-TeV

CDF Collaboration, T. Aaltonen

摘要:

我们提出了一个测量的横向动量相对于喷流轴($k_{T}$)的粒子在喷流产生的$p\bar p$碰撞在$\sqrt{s}=1.96$ TeV。结果得到的开口角为0.5弧度的喷射轴周围的事件与dijet不变质量之间的66和737 GeV/c $^{2}$的锥内的带电粒子。的实验数据进行比较,理论预测的框架内的mammed微扰QCD使用修改的领导日志和下一个修改的领导日志近似的碎片部分子。比较表明,数据的趋势成功地描述了理论预测,表明微扰QCD阶段的射流破碎是占主导地位的基本射流特性的塑造。

英文摘要:

We present a measurement of the transverse momentum with respect to the jet axis ($k_{T}$) of particles in jets produced in $p\bar p$ collisions at $\sqrt{s}=1.96$ TeV. Results are obtained for charged particles within a cone of opening angle 0.5 radians around the jet axis in events with dijet invariant masses between 66 and 737 GeV/c$^{2}$. The experimental data are compared to theoretical predictions obtained for fragmentation partons within the framework of resummed perturbative QCD using the modified leading log and next-to-modified leading log approximations. The comparison shows that trends in data are successfully described by the theoretical predictions, indicating that the perturbative QCD stage of jet fragmentation is dominant in shaping basic jet characteristics.

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