# Results from proton-lead and fixed-target collisions at LHCb

## TL;DR

The LHCb collaboration reports new findings on charm, beauty, and quarkonia production in proton-lead and fixed-target collisions, highlighting initial and final-state effects, with some results aligning with predictions and others indicating new phenomena.

## Contribution

This paper provides the first cross-section measurements of charm-anticharm and antiproton production in fixed-target proton-helium collisions at 100 GeV, expanding understanding of nuclear matter effects.

## Key findings

- Charm and beauty hadron production consistent with initial-state effect predictions.
- Evidence of significant final-state effects in excited $mbda(nS)$ resonances.
- First measurement of $car{c}$ and antiproton production in proton-helium fixed-target collisions.

## Abstract

The latest results obtained by the LHCb collaboration from proton-lead and proton-gas fixed-target collisions are presented. Results related to charm and beauty flavour hadron and quarkonia production in proton-lead collisions, being clean probes for Cold Nuclear Matter effects, are compatible to predictions based on initial-state effects. Indications of significant final-state effects in excited $\Upsilon(nS)$ resonances production are reported. The first cross-section measurement of $c\bar{c}$ and antiproton production in fixed-target proton-helium collisions at 100 GeV energy scale are also presented. More results will come from the latest Run 2 and future Run 3 data.