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  1. ; ; ; ; ; ; ; ; ; ; et al (, The European Physical Journal A)
    Abstract We propose a new measurement of the ratio of positron-proton to electron-proton elastic scattering at DESY. The purpose is to determine the contributions beyond single-photon exchange, which are essential for the Quantum Electrodynamic (QED) description of the most fundamental process in hadronic physics. By utilizing a 20 cm long liquid hydrogen target in conjunction with the extracted beam from the DESY synchrotron, we can achieve an average luminosity of$$2.12\times 10^{35}$$ 2.12 × 10 35  cm$$^{-2}\cdot $$ - 2 · s$$^{-1}$$ - 1  ($$\approx 200$$ ≈ 200 times the luminosity achieved by OLYMPUS). The proposed two-photon exchange experiment (TPEX) entails a commissioning run at a beam energy of 2 GeV, followed by measurements at 3 GeV, thereby providing new data up to$$Q^2=4.6$$ Q 2 = 4.6  (GeV/c)$$^2$$ 2 (twice the range of current measurements). We present and discuss the proposed experimental setup, run plan, and expectations. 
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  2. ; ; ; ; ; ; ; ; ; ; et al (, Physical Review Letters)
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  3. ; ; ; ; ; ; ; ; ; ; et al (, Frontiers of Physics)
    Abstract The superτ-charm facility (STCF) is an electron–positron collider proposed by the Chinese particle physics community. It is designed to operate in a center-of-mass energy range from 2 to 7 GeV with a peak luminosity of 0.5 × 1035cm−2·s−1or higher. The STCF will produce a data sample about a factor of 100 larger than that of the presentτ-charm factory — the BEPCII, providing a unique platform for exploring the asymmetry of matter-antimatter (charge-parity violation), in-depth studies of the internal structure of hadrons and the nature of non-perturbative strong interactions, as well as searching for exotic hadrons and physics beyond the Standard Model. The STCF project in China is under development with an extensive R&D program. This document presents the physics opportunities at the STCF, describes conceptual designs of the STCF detector system, and discusses future plans for detector R&D and physics case studies. 
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  4. ; ; ; ; ; ; ; ; ; ; et al (, Physical Review D)
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