CERN Accelerating science

Article
Report number	FERMILAB-CONF-24-0094-PIP2
Title	Update in the optics design of monochromatization interaction region for direct Higgs s-channel production at FCC-ee
Related title	Update in the optics design of monochromatization interaction region for direct Higgs s-channel production at FCC-ee
Author(s)	Zhang, Zhandong (Beijing, Inst. High Energy Phys. ; IJCLab, Orsay ; Beijing, GUCAS) ; Faus-Golfe, Angeles (IJCLab, Orsay) ; Jiang, Hongping (Unlisted, CN) ; Bai, Bowen (Harbin Inst. Tech.) ; Raimondi, Pantaleo (Fermilab) ; Zimmermann, Frank (CERN) ; Oide, Katsunobu (U. Geneva (main) ; KEK, Tsukuba)
Publication	2024
Number of pages	4
In:	JACoW IPAC 2024 (2024) WEPR21
In:	15th International Particle Accelerator Conference (IPAC 2024), Nashville, TN, United States, 19 - 24 May 2024, pp.WEPR21
DOI	10.18429/JACoW-IPAC2024-WEPR21
Subject category	Accelerators and Storage Rings
Accelerator/Facility, Experiment	CERN FCC
Abstract	The FCC-ee could allow the measurement of the electron Yukawa coupling via direct Higgs s-channel production at  125 GeV centre-of-mass (CM) energy, provided that the CM energy spread of this channel, can be reduced to about 5–10 MeV to be comparable to the width of the standard model Higgs boson. The natural collision-energy spread at 125 GeV, due only to synchrotron radiation (SR), is about 50 MeV. Its reduction to the desired level can be accomplished by means of “monochromatization”, e.g., through introducing non-zero dispersion of opposite sign at the Interaction Point (IP), for the two colliding beams. This nonzero dispersion at the IP (horizontal or vertical) could be generated by different methods, requiring or not modifications of the Final Focus System (FFS) Local Chromaticity Correction (LCC) system. In this paper we report and compare the different recent Interaction Region (IR) optics design of this new possible collision mode.
Copyright/License	CC-BY-4.0

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