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@inproceedings{telnov:ipac2021-mopab033, author = {V.I. Telnov}, title = {{Monochromatization of e⁺e⁻ Colliders with a Large Crossing Angle}}, booktitle = {Proc. IPAC'21}, pages = {152--154}, eid = {MOPAB033}, language = {english}, keywords = {emittance, resonance, collider, luminosity, radiation}, venue = {Campinas, SP, Brazil}, series = {International Particle Accelerator Conference}, number = {12}, publisher = {JACoW Publishing, Geneva, Switzerland}, month = {08}, year = {2021}, issn = {2673-5490}, isbn = {978-3-95450-214-1}, doi = {10.18429/JACoW-IPAC2021-MOPAB033}, url = {https://jacow.org/ipac2021/papers/mopab033.pdf}, note = {https://doi.org/10.18429/JACoW-IPAC2021-MOPAB033}, abstract = {{The relative center-of-mass energy spread at e⁺e⁻ colliders is much larger than the widths of narrow resonances, which greatly lowers the resonance production rates of J/Psi, Psi-prime, Upsililon(nS), n=1-3. Thus, a significant reduction of the center-of-mass energy spread would open up great opportunities in the search for new physics in rare decays of narrow resonances, the search for new narrow states with small partial e⁺e⁻ width. The existing monochromatization scheme is only suitable for head-on collisions, while e⁺e⁻ colliders with crossing angles (the so-called Crab Waist collision scheme) can provide much higher luminosity. In this report, a new monochromatization method for colliders with a large crossing angle is discussed*. The contribution of the beam energy spread to the spread of the center-of-mass energy is canceled by introducing an appropriate energy-angle correlation at the interaction point; the relative RMS mass spread of about (3-5)10⁻⁶ seems possible. Limitations of the proposed method are also considered. This monochromatization scheme is very attractive for the Upsilon-meson region and below.}}, }