Speaker
Xiaoming Zhang
(Lawrence Berkeley National Lab. (US))
Description
"The $p_{\rm T}$ dependence of the baryon/meson yield ratio in hadronic and nuclear collisions is sensitive to the collective expansion of the system, partonic recombination into hadrons, jet fragmentation and hadronization. This ratio for inclusive yields in the region $2 < p_{\rm T} < 6$~GeV/$c$ is significantly enhanced in large systems (Pb--Pb, p--Pb) relative to that in proton--proton collisions. However, the origin of the enhancement remains an open question.
In this talk we explore the connection between baryon yield enhancement and jet production, through measurement of the $p_{\rm T}$-differential spectrum of ${\rm K}_{\rm S}^{0}$ and $\Lambda$ in p--Pb collisions at $\sqrt{s_{\rm NN}}=5.02$~TeV,
both inclusively and within energetic jets. The results show that jet fragmentation in p--Pb collisions is similar to that in pp collisions,
without evidence of baryon yield enhancement, and that the baryon yield enhancement arises solely from the dynamics of the
underlying event in complex collision systems."
Author
Xiaoming Zhang
(LBNL)