论文标题
$ \rmλ_{c}^{+} $生产和pp中的baryon to-meson比率在$ \ sqrt {s_ \ mathrm {nn}} = 5.02 $ tev in lhc at lhc at LHC
$\rm Λ_{c}^{+}$ production and baryon-to-meson ratios in pp and p-Pb collisions at $\sqrt{s_\mathrm{NN}} = 5.02$ TeV at the LHC
论文作者
论文摘要
Charm Baryon $ \rmλ_{C}^{+} $的及时产生和$ \rmλ_{c}^{+}^{+}/\ mathrm {d^0} $的生产比在pp和pb collision in pp pp collivisation and $ \ \ sqrt {sqrt {sqrt {sqrt {sqrt { 5.02 $ TEV。这些新测量结果显示，随着横向动量的增加（$ p _ {\ rm t} $）在范围$ 2 <p _ p _ {\ rm rm c <12 $ c的范围内，themmmentions的$ \rmλ_{c}^{+}^{+}^{+}/\ mathrm {+} baryon to-meson比率$ {\ rm p}/π$和$λ/\ mathrm {k^0_s} $。在低$ p _ {\ rm t} $的情况下，预测包括其他颜色连接机制，超出了领先的近似值；假设存在额外的高质量魅力 - 巴里昂州；或通过聚结的包括强调可以描述数据，而以$ \ mathrm {e^+e^ - } $和$ \ mathrm {e^-p} $ collisions以$ \ mathrm {e^+e^ - } $测量的预测进行了预测。这封信中提出的结果提供了重要的证据，表明既定的Parton到Hadron碎片的普遍性（碰撞系统独立性）的假设不足以描述LHC Energies HADRONIC碰撞中的魅力 - 巴里昂的产生。
The prompt production of the charm baryon $\rm Λ_{c}^{+}$ and the $\rm Λ_{c}^{+}/\mathrm {D^0}$ production ratios were measured at midrapidity with the ALICE detector in pp and p-Pb collisions at $\sqrt{s_\mathrm{NN}} = 5.02$TeV. These new measurements show a clear decrease of the $\rm Λ_{c}^{+}/\mathrm {D^0}$ ratio with increasing transverse momentum ($p_{\rm T}$) in both collision systems in the range $2<p_{\rm T}<12$ GeV/$c$, exhibiting similarities with the light-flavour baryon-to-meson ratios ${\rm p}/π$ and $Λ/\mathrm {K^0_S}$. At low $p_{\rm T}$, predictions that include additional colour-reconnection mechanisms beyond the leading-colour approximation; assume the existence of additional higher-mass charm-baryon states; or include hadronisation via coalescence can describe the data, while predictions driven by charm-quark fragmentation processes measured in $\mathrm {e^+e^-}$ and $\mathrm {e^-p}$ collisions significantly underestimate the data. The results presented in this letter provide significant evidence that the established assumption of universality (colliding-system independence) of parton-to-hadron fragmentation is not sufficient to describe charm-baryon production in hadronic collisions at LHC energies.
