Opportunities for studying -even resonances at a 3–12 GeV photon collider

K. I. Beloborodov; T. A. Kharlamova; G. Moortgat-Pick; V. I. Telnov

doi:10.1140/epjc/s10052-023-11533-8

2024 Impact factor 4.8

Particles and Fields

Open Access

Eur. Phys. J. C (2023) 83: 359
https://doi.org/10.1140/epjc/s10052-023-11533-8

Regular Article - Experimental Physics

Opportunities for studying $C$ -even resonances at a 3–12 GeV photon collider

K. I. Beloborodov¹^,2, T. A. Kharlamova¹^,2, G. Moortgat-Pick³ and V. I. Telnov¹^,2^d

¹ Budker Institute of Nuclear Physics, 630090, Novosibirsk, Russia
² Novosibirsk State University, 630090, Novosibirsk, Russia
³ II. Inst. f. Theoret. Physics, University of Hamburg, 22761, Hamburg, Germany

^d telnov@inp.nsk.su

Received: 16 December 2022
Accepted: 18 April 2023
Published online: 4 May 2023

Abstract

Recently, a $γ γ$ $\gamma \gamma$ collider based on the existing 17.5 GeV linac of the European XFEL has been proposed. High-energy photons will be generated by Compton scattering of laser photons with a wavelength of 0.5–1 $μ m$ ${\,\upmu \mathrm m}$ on electrons. Such a photon collider covers the range of invariant masses $W_{γ γ} < 12$ $W_{\gamma \gamma } <12$ $Ge V / c^{2}$ ${\mathrm {\,Ge V\!/}c^2}$ . The physics program includes spectroscopy of $C$ $$ C $$ -even resonances (c-, b-quarkonia, 4-quark states, glueballs) in various $J^{P}$ $$J^P$$ states. Variable circular and linear polarizations will help in determining the quantum numbers. In this paper, we present a summary of measured and predicted two-photon widths of various resonances in the mass region 3–12 $Ge V / c^{2}$ ${\mathrm {\,Ge V\!/}c^2}$ and investigate the experimental possibility of observing these heavy two-photon resonances under the conditions of a large multi-hadron background. Registration of all final particles is assumed. The minimum values of $Γ_{γ γ} (W)$ $\varGamma _{\gamma \gamma }(W)$ are obtained at which resonances can be detected at a $5 σ$ $5\sigma$ confidence level in 1 year of operation.

© The Author(s) 2023

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