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Non-zero transverse single spin asymmetry of very forward $\pi^0$ in polarized $p + p$ collisions at $\sqrt{s} = 510$ GeV

by M. H. Kim for the RHICf Collaboration

This Submission thread is now published as SciPost Phys. Proc. 8, 060 (2022)

Submission summary

As Contributors: Minho Kim
Preprint link: scipost_202108_00002v2
Date accepted: 2022-04-06
Date submitted: 2022-03-20 04:01
Submitted by: Kim, Minho
Submitted to: SciPost Physics Proceedings
Proceedings issue: DIS2021
Academic field: Physics
Specialties:
  • High-Energy Physics - Experiment
Approach: Experimental

Abstract

The RHICf experiment measured transverse single spin asymmetry of very forward ($\eta > 6$) $\pi^0$ from polarized $p + p$ collisions at $\sqrt{s} = 510$ GeV. In order to measure it precisely, we installed a new electromagnetic calorimeter at zero-degree area of the STAR experiment at the Relativistic Heavy Ion Collider (RHIC) and measured the $\pi^0$s over the kinematic range of $x_F > 0.25$ and $0 < p_T < 1$ GeV/$c$ in June, 2017. A clear non-zero asymmetry was observed even in low $p_T < 1$ GeV$c$ showing a similar $x_F$ dependence with the forward ($2 < \eta < 4$) $\pi^0$ ones. A possible diffractive contribution may need to be taken into account to explain the very forward $\pi^0$ asymmetry. RHICf-STAR combined analysis and follow-up experiment will give a clue to understand it qualitatively.

Published as SciPost Phys. Proc. 8, 060 (2022)



Submission & Refereeing History

Published as SciPost Phys. Proc. 8, 060 (2022)

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Resubmission scipost_202108_00002v2 on 20 March 2022

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