CERN Accelerating science

Article
Title Monochromatization Interaction Region Optics Design for Direct s-channel production at FCC-ee
Author(s) Zhang, Z D (Beijing, Inst. High Energy Phys. ; BSRF, Beijing ; IJCLab, Orsay) ; Faus-Golfe, A (IJCLab, Orsay) ; Jiang, H P (Harbin Inst. Tech.) ; Bai, B W (Harbin Inst. Tech.) ; Zimmermann, F (CERN) ; Oide, K (Sokendai, Tsukuba ; KEK, Tsukuba ; Geneva U.)
Publication 2023
Number of pages 4
In: JACoW IPAC 2023 (2023) MOPL079
In: 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.MOPL079
DOI 10.18429/JACoW-IPAC2023-MOPL079
Subject category Accelerators and Storage Rings
Abstract One of the most fundamental measurements since the Higgs boson discovery, is its Yukawa couplings. Such a measurement is only feasible, if the centre-of-mass (CM) energy spread of the e+e- collisions can be reduced from  50 MeV to a level comparable to the Higgs boson’s natural width of  4 MeV. To reach such desired collision energy spread and improve the CM energy resolution in colliding-beam experiments, the concept of a monochromatic colliding mode has been proposed as a new mode of operation in FCC-ee. This monochromatization mode could be achieved by generating a nonzero dispersion function of opposite signs for the two beams, at the Interaction Point (IP). Several methods to implement a monochromatization colliding scheme are possible, in this paper we report the implementation of such a scheme by means of dipoles. More in detail a new Interaction Region (IR) optics design for FCC-ee at 125 GeV (direct Higgs s-channel production) has been designed and the first beam dynamics simulations are in progress.
Copyright/License CC-BY-4.0

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