Recent Spin Results from STAR

TL;DR

This paper reports on the recent results from the STAR experiment at RHIC, focusing on the enhanced forward acceptance with the new Forward Meson Spectrometer and its potential to study spin phenomena and nuclear medium effects.

Contribution

Introduction of the Forward Meson Spectrometer at STAR enabling extended forward measurements of spin-related observables and nuclear effects.

Findings

Enhanced forward acceptance allows new spin measurements.

Access to omega meson decay channels for analyzing spin asymmetries.

Potential to compare p+p and d+Au collisions for nuclear medium insights.

Abstract

In Run 8 at RHIC, STAR significantly enhanced its forward acceptance relative to previous years with the commissioning of a new detector, the Forward Meson Spectrometer (FMS). The large geometrical acceptance of the FMS allows us to extend the forward reach of the data beyond inclusive pions accessed by modular calorimeters. The spin-1 omega is accessible to the FMS through its decay to a neutral pion and a photon. Such events can help disentangle the dynamical origins of observed large analyzing powers in the forward region, and can contribute to our knowledge of the nuclear medium by comparisons of p+p to d+Au. Here we report on the status of this analysis.