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arXiv 1909.00486nucl-exhep-ex
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PDMATHAAB = 7 TeV时pp碰撞和$\sqrt{s_{\rm{NN}}}$ = 5.02 TeV时p-Pb碰撞中$Λ$(1520)产生的测量

Measurement of $Λ$(1520) production in pp collisions at $\sqrt{s}$ = 7 TeV and p-Pb collisions at $\sqrt{s_{\rm{NN}}}$ = 5.02 TeV

ALICE Collaboration

摘要:

在$\sqrt{s}$ = 7 TeV的非弹性pp碰撞和$\sqrt{s_{\rm{NN}}}$ = 5.02 TeV的p-Pb碰撞中,测量了非单衍射事件和多重性类中$Λ$(1520)重子共振的产生.共振是通过其强子衰变通道$Λ$(1520)$\rightarrow$ pK $^{-}$和与ALICE探测器的电荷共轭重建的。根据pp和p-Pb碰撞中的横动量分布,计算了积分产额和平均横动量。平均横动量遵循质量排序,就像以前在同一碰撞系统中观察到的其他超子一样。由其它轻强子($π$,K,K $_{\rm{S}}^0$,p,$Λ$)约束的冲击波函数描述了p-Pb碰撞中直到3.5GeV/ $c$的$Λ$(1520)横动量分布的形状。在这个模型的框架下,这个观察表明,$Λ(1520)$共振参与了相同的集体径向流作为其他轻强子。$Λ(1520)$的产额与基态粒子$Λ$的产额之比作为带电粒子多重数的函数保持不变,表明p-Pb碰撞中的强子相对$Λ$(1520)产额没有净效应。

英文摘要:

The production of the $Λ$(1520) baryonic resonance has been measured at midrapidity in inelastic pp collisions at $\sqrt{s}$ = 7 TeV and in p-Pb collisions at $\sqrt{s_{\rm{NN}}}$ = 5.02 TeV for non-single diffractive events and in multiplicity classes. The resonance is reconstructed through its hadronic decay channel $Λ$(1520) $\rightarrow$ pK$^{-}$ and the charge conjugate with the ALICE detector. The integrated yields and mean transverse momenta are calculated from the measured transverse momentum distributions in pp and p-Pb collisions. The mean transverse momenta follow mass ordering as previously observed for other hyperons in the same collision systems. A Blast-Wave function constrained by other light hadrons ($π$, K, K$_{\rm{S}}^0$, p, $Λ$) describes the shape of the $Λ$(1520) transverse momentum distribution up to 3.5 GeV/$c$ in p-Pb collisions. In the framework of this model, this observation suggests that the $Λ(1520)$ resonance participates in the same collective radial flow as other light hadrons. The ratio of the yield of $Λ(1520)$ to the yield of the ground state particle $Λ$ remains constant as a function of charged-particle multiplicity, suggesting that there is no net effect of the hadronic phase in p-Pb collisions on the $Λ$(1520) yield.

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