arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0903.2573hep-ph
收藏

低能反质子束产生包容性粲的部分子模型计算

Parton Model Calculation of Inclusive Charm Production by a Low-energy Antiproton Beam

E. Braaten, P. Artoisenet

摘要:

利用部分子模型和次首阶微扰QCD计算了低能反质子束产生包含粲的截面。对于动量为15 GeV的反质子束流,当粲夸克质量从1.3变化到1.7 GeV时,QCD耦合常数中次领先级的粲截面变化超过一个数量级.通过要求相同的粲夸克质量值给出质子束固定靶实验测量的粲截面,可以减少这种变化。由此得到的低能反质子束的粲截面的估计值足够大,可以用来研究粲介子混合。

英文摘要:

The cross section for inclusive charm production by a low-energy antiproton beam is calculated using the parton model and next-to-leading order perturbative QCD. For an antiproton beam with a momentum of 15 GeV, the charm cross section at next-to-leading order in the QCD coupling constant changes by more than an order of magnitude as the charm quark mass is varied from 1.3 to 1.7 GeV. The variations can be reduced by demanding that the same value of the charm quark mass give the measured charm cross sections for fixed-target experiments with a proton beam. The resulting estimate for the charm cross section from a low-energy antiproton beam is large enough to allow the study of charm meson mixing.

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。

↑