p+p碰撞中pbar/p比的能量依赖性
Energy dependence of pbar/p ratio in p+p collisions
摘要：
我们编制了实验测量的pbar/p比在中快度的p+p碰撞从\sqrt{s} = 23到7000 GeV，并比较它的重子生产的各种机制，如实施PYTHIA，PHOJET和HIJING/B-Bbar模型。对于使用默认设置研究的模型，PHOJET与测量结果的一致性最好，PYTHIA在\sqrt{s} < 200 GeV时给出了更高的值，HIJING/B-Bbar的比值对于所有研究的\sqrt{s}始终较低。比较Pythia中重子产生的不同机制的数据表明，通过适当调整色场中双夸克-反双夸克对产生相对于夸克-反夸克产生的抑制，并允许双夸克根据爆米花方案分裂，对\sqrt{s} < 200 GeV的测量pbar/p比给出了相当合理的描述。比较中快度p+p碰撞和核-核（A+A）碰撞中pbar/p比对束流能量的依赖性，发现当\sqrt{s} < 200 GeV时，A+A碰撞的重子产生量明显高于p+p碰撞。我们还进行了唯象拟合的y_beam的pbar/p比的依赖。
英文摘要：
We have compiled the experimentally measured pbar/p ratio at midrapidity in p+p collisions from \sqrt{s} = 23 to 7000 GeV and compared it to various mechanisms of baryon production as implemented in PYTHIA, PHOJET and HIJING/B-Bbar models. For the models studied with default settings, PHOJET has the best agreement with the measurements, PYTHIA gives a higher value for \sqrt{s} < 200 GeV and the ratios from HIJING/B-Bbar are consistently lower for all the \sqrt{s} studied. Comparison of the data to different mechanisms of baryon production as implemented in PYTHIA shows that through a suitable tuning of the suppression of diquark-antidiquark pair production in the color field relative to quark-antiquark production and allowing the diquarks to split according to the popcorn scheme gives a fairly reasonable description of the measured pbar/p ratio for \sqrt{s} < 200 GeV. Comparison of the beam energy dependence of the pbar/p ratio in p+p and nucleus-nucleus (A+A) collisions at midrapidity shows that the baryon production is significantly more for A+A collisions relative to p+p collisions for \sqrt{s} < 200 GeV. We also carry out a phenomenological fit to the y_beam dependence of the pbar/p ratio.
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