不同SPS和LHC能量下p+p碰撞中旁观者部分子对Λ快度宽度的贡献
Spectator partons contribution in the rapidity width of lamda in p+p collisions at various SPS and LHC energies
AI总结：
本文利用UrQMD-3.4和PYTHIA8.2研究不同SPS和LHC能量下p+p碰撞中Λ的快度宽度，发现其随能量增加源于旁观者部分子产生的轻味夸克和双夸克，并证实中心碰撞中无此非平凡贡献。
摘要：
利用UrQMD-3.4和PYTHIA8.2生成的事件，估算了在不同相对论重离子对撞机（RHIC）和大型强子对撞机（LHC）能量下p+p碰撞中产生的所有初级带电粒子的赝快度分布，并与UA5和ALICE合作组的已有结果进行了比较。基于这两组生成数据，给出了在不同超级质子同步加速器（SPS）和LHC能量下p+p碰撞中不同介子和重子的快度宽度随其静止质量的变化。当考虑整个快度空间时，与重离子数据类似，从SPS到LHC能量（最高达√s=13 TeV），p+p碰撞中Λ的快度分布宽度也可观察到增加，这表明其在p+p和A+A碰撞中具有普适特征。研究发现，p+p碰撞中Λ快度分布宽度增加的根源在于碰撞强子的旁观者部分子产生的轻味夸克和双夸克，导致在所研究的p+p碰撞极端快度区出现Λ/反Λ>1。在LHC能量下的中心p+p碰撞中，当不存在旁观者部分子时，发现Λ的快度宽度与λ一样呈相同的高斯形状，且两种分布的宽度变得相同，证实了在重离子和非中心p+p碰撞中所见的对Λ快度宽度不存在非平凡贡献。
英文摘要：
Pseudorapidity distributions of all primary charged particles produced in p+p collisions at various Relativistic Heavy Ion Collider (RHIC) and Large Hadron Collider (LHC) energies using UrQMD-3.4 and PYTHIA8.2-generated events are estimated and compared with the existing results of UA5 and ALICE collaborations. With both the sets of generated data, the variation of rapidity widths with the rest masses of different mesons and baryons of p+p collisions at various Super Proton Synchrotron (SPS) and LHC energies are presented. An increase in the width of the rapidity distribution of lambda, similar to heavy-ion data, could be seen in p+p collisions as well from SPS to the LHC energies (up to {sqrt_s} =13 TeV) when the entire rapidity space is considered, indicating its universal feature both in p+p and A+A collisions. The genesis of the increased width of rapidity distribution of Lambda in p+p collision is found to be in the production of light flavored quarks and diquarks from the spectator partons of the colliding hadrons resulting {lambda}/{anti_lambda}>1 at the extreme rapidities of the studied p+p collisions. At the LHC energies for central p+p collision, when there is no spectator partons, the rapidity width of {lambda} is found to take the same Gaussian shape as that of lambda and the widths of both the distributions become the same confirming no non-trivial contribution to the rapidity width of {lambda} as seen in heavy-ion and non-central p+p collisions.
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