ILC Workshop on Potential Experiments (ILCX2021)

Center-of-mass energy determination using dimuon events at ILC

27 Oct 2021, 20:36

24m

Room #6 (Zoom Meeting ID: 819 7353 2455)

Oral presentation using Zoom Session I: Electroweak physics I: Electroweak physics

Speaker

Graham Wilson

Description

Precision measurements of masses from both center-of-mass energy scans and using beam energy and momentum constraints rely on knowledge of the absolute center-of-mass energy scale and the luminosity spectrum, dL/d$\sqrt{s}$. A key method is the $\sqrt{s}_{p}$ technique that uses the tracker muon momenta measurements in $e^{+}e^{-} \to \mu^{+} \mu^{-} (\gamma)$ events to determine both $\sqrt{s}$ and the related luminosity spectrum. The talk will describe recent studies aimed at evaluating this method using fully reconstructed ILC events at $\sqrt{s}=250$ GeV including detector effects, crossing-angle, beam-energy-spread, beamstrahlung, overlay, ISR, FSR, backgrounds, and investigations of vertex fitting. The same event sample is also used to evaluate sensitivity to the Z mass and width.

Presentation materials

ILCX_GWW_V3.pdf