# Effect of in-medium mass-shift on transverse-momentum spectrum and elliptic anisotropy of $\phi$ meson

## TL;DR

This study investigates how in-medium mass-shift impacts the transverse-momentum spectrum and elliptic flow of $\, ext{phi}\, ext{mesons}$, revealing that mass-shift enhances yields and suppresses elliptic flow, with effects depending on source and probability.

## Contribution

It provides the first detailed analysis of how in-medium mass-shift influences $\, ext{phi}\, ext{meson}$ observables in heavy-ion collisions, offering a method to constrain mass-shift ranges.

## Key findings

- Mass-shift increases $\, ext{phi}\, ext{meson}$ yields.
- Mass-shift suppresses elliptic flow $v_2$ at high momentum.
- Effects vary with source and probability of mass-shift.

## Abstract

We study the effect of in-medium mass-shift on transverse-momentum spectrum and elliptic anisotropy of $\phi$ meson. It is found that the mass-shift enhances the $\phi$ yields and suppresses the elliptic flow $v_2$ in large momentum region, and the effects increase with the increasing mass-shift. The effects are various for different sources and decrease with the increasing expanding velocity. We further study the effects for parts of all $\phi$ meson with mass-shift, and the effects decrease with the decreasing probability of $\phi$ meson with mass-shift. Since the different mass-shift lead to different transverse-momentum spectrum and $v_2$, our study may provide a way to restrict the ranges of in-medium mass-shift of $\phi$ meson in high-energy heavy-ion collisions.