An Iterative Weighting Method to Apply ISR Correction to $e^+e^-$ Hadronic Cross-section Measurements

TL;DR

This paper introduces an iterative weighting method to efficiently correct for initial state radiation effects in $e^+e^-$ collision experiments, improving accuracy and reducing computational resources needed.

Contribution

The paper presents a novel iterative weighting approach that uses simulated ISR events only once, significantly decreasing computational time and storage compared to traditional iterative methods.

Findings

The method yields consistent correction results.

Reduces computational time and disk space by over 80%.

Speeds up $e^+e^-$ hadronic cross-section measurements.

Abstract

Initial state radiation (ISR) plays an important role in $e^+$$e^-$ collision experiments such as the BESIII. To correct the ISR effects in measurements of hadronic cross-sections of $e^+e^-$ annihilation, an iterative method that weights simulated ISR events is proposed here to assess the efficiency of event selection and the ISR correction factor for the observed cross-section. The simulated ISR events were generated only once, and the obtained cross-sectional line shape was used iteratively to weigh the same simulated ISR events to evaluate the efficiency and corrections until the results converge. Compared with the method of generating ISR events iteratively, the proposed weighting method provides consistent results, and reduces the computational time and disk space required by a factor of five or more, thus speeding-up $e^+e^-$ hadronic cross-section measurements.