# Dilepton Production in p$+$p, Au$+$Au collisions at $\sqrt{s_{NN}}$ = 200 GeV and U$+$U collisions at $\sqrt{s_{NN}}$ = 193 GeV

## TL;DR

This paper presents measurements of dielectron and dimuon spectra in various collision systems at RHIC, revealing insights into electromagnetic radiation and medium effects in high-energy nuclear collisions.

## Contribution

It provides new dielectron and dimuon invariant mass spectra measurements in p+p, Au+Au, and U+U collisions at RHIC energies, including first results from the Muon Telescope Detector.

## Key findings

- Dielectron spectra show mass and pT dependence in different collision systems.
- Comparison of t distributions with ultra-peripheral collisions reveals medium effects.
- First muon pair spectra measurements from the Muon Telescope Detector.

## Abstract

In this contribution we report $e^{+}e^{-}$ spectra with various invariant mass and p$_{T}$ differentials in Au$+$Au collisions at $\sqrt{s_{NN}}$=200 GeV and U$+$U collisions at $\sqrt{s_{NN}}$=193 GeV. The structure of the t ($t\approx p^2_{\mathrm{T}}$) distributions of these mass regions will be shown and compared with the same distributions in ultra-peripheral collisions. Additionally, this contribution discusses first measurements of $\mu^{+}\mu^{-}$ invariant mass spectra from STAR's recently installed Muon Telescope Detector (MTD) in p$+$p and Au$+$Au collisions at $\sqrt{s_{NN}}$ = 200 GeV.