# Dependence of semi-inclusive jet and high-$p_{T}$ charged particle production on event activity at high backward-rapidity in $\sqrt{s_\mathrm{NN}}$ = 200 GeV $p$+Au collisions at STAR

- Institution: CERN
- Department: Conferences
- Speaker: David Stewart
- Year: 2020
- Language: English
- Subjects: Physics
- Source: [CERN](https://videos.cern.ch/record/3000682)
- Licence: [CERN](http://copyright.web.cern.ch)
- Who can watch: Tweens profiles and older (sources give no ratings; placed by Invisible Network from the source's own words)

Observations of flow-like signals in small-system collisions, $pp$ and $p$/$d$+A, have led to a resurgence of interest and measurements, the results of which have perhaps permanently challenged the naive picture of initial geometry and subsequent early-time dynamics for these systems. In the wake of this renewed interest, jet and high-$p_\mathrm{T}$ particle measurements in small systems are proving similarly fruitful and challenging. While no clear signal of jet quenching has been observed, inclusive measurements at both LHC and RHIC energies of $p$/$d$+A collisions show jet spectra enhancement/suppression at high Bjorken-$x$ when binned by event activity (EA) at high backward-rapidity (the A-going direction). In this talk we present the first semi-inclusive small-system jet spectra measurements at RHIC energies. The results show significant suppression of the jet spectra normalized per trigger in high-EA relative to low-EA collisions. PYTHIA 8 simulations verify that the modification of these spectra is not the result of trivial autocorrelations. Surprisingly, these simulations do show a qualitatively similar modification and studies to understand the cause will be presented. Finally, we present charged particle correlations with EA at high backward-rapidity, which hint at energy conservation or fluctuating proton effects..

0:00:00 Slide 1

0:01:51 Slide 2

0:03:41 Slide 3

0:05:31 Slide 4

0:07:21 Slide 5

0:09:11 Slide 6

0:11:01 Slide 7

0:12:51 Slide 8

0:14:41 Slide 9

0:16:31 Slide 10

0:18:22 Slide 11

## Lectures

1. [Dependence of semi-inclusive jet and high-$p_{T}$ charged particle production on event activity at high backward-rapidity in $\sqrt{s_\mathrm{NN}}$ = 200 GeV $p$+Au collisions at STAR](https://invisiblenetwork.ai/learn/cern/3000682/5f64c023b9c9), 19 min (CERN's player)