雪人2021白皮书升级超级肯尼亚的电子束：发现潜力和拟议实施

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雪人2021白皮书升级超级肯尼亚的电子束：发现潜力和拟议实施

Snowmass 2021 White Paper on Upgrading SuperKEKB with a Polarized Electron Beam: Discovery Potential and Proposed Implementation

论文作者

Accardi, A., Asner, D. M., Atmacan, H., Baartman, R., Banerjee, Sw., Beaubien, A., Bennett, J. V., Bertemes, M., Bessner, M., Biswas, D., Bonvicini, G., Brenny, N., Briere, R. A., Browder, T. E., Chen, C., Choudhury, S., Cinabro, D., Cochran, J., Cremaldi, L. M., Deconinck, W., Di Canto, A., Dubey, S., Flood, K., Fulsom, B. G., Gaur, V., Gericke, M., Godang, R., Gu, T., Guan, Y., Guilliams, J., Hadjivasiliou, C., Hartbrich, O., Hearty, C., Hoferichter, M., Jacobs, W. W., Jaffe, D. E., Junginger, T., Kang, S., Kapitánová, L., Ketter, C., Khatri, A., Kinoshita, K., Kohani, S., Koop, I. A., Korandla, H., Sari, I. Koseoglu, Kroeger, R., Kumar, J., Kumara, K. J., Kuriki, M., Lam, T., Laycock, P. J., Diberder, F. R. Le, Li, L., Liptak, Z., Liventsev, D., Mammei, J., Martens, A., Meier, F., Miller, C., Mitra, S., Moorthy, K., Natochii, A., Nellikunnummel, N., Nishimura, K. A., Otboev, A. V., Oxford, E. R., Panta, A., Parham, K., Parker, B., Pedlar, T. K., Peng, Y., Peschke, R., Piilonen, L. E., Planche, T., Pokharel, S., Prell, S., Purwar, H., Herrmann, D. E. Ricalde, Roney, J. M., Rosenfeld, C., Sahoo, D., Sanders, D. A., Sangal, A., Savinov, V., Schneider, S., Schueler, J., Schwartz, A. J., Shatunov, Yu. M., Shebalin, V., Sibidanov, A., Signori, A., Stottler, Z. S., Strube, J., Trabelsi, K., Tripathi, S., Vahsen, S. E., Varner, G. S., Vossen, A., Wang, D., Wang, E., Wienands, U., Wood, L., Yelton, J., Zhai, Y., Zhang, B., Zhou, D., Zomer, F.

论文摘要

用偏振电子梁升级Superkekb电子 - 峰值对撞机，在10.58 GEV的质量中心能量中开设了一个新的精密物理程序程序。这份白皮书描述了该“手性美女”程序的物理潜力。它包括可从$ \ sin^2θ_w$精确测量的预测，这些预测可以从独立的左右不对称测量值中获得$ e^+e^ - $ $ $ $ $ $ $的过渡到对电子，muons，muons，taus，taus，charm和b-quarks的过渡。 $ \ sin^2θ_w$可以在SuperKekB获得的精度与LEP/SLC世界平均水平的匹配，但以10.58 GEV的中心能量为单位。对臂线，魅力和$ b $ QUARKS的耦合的测量将得到显着改善，并且将解决SLC $ A_ {LR} $和LEP $ A_ {FB}^B $测量的现有$3σ$差异。中性当前普遍性的精确度量将比当前可用的更精确的数量级。由于能量尺度远离$ z^0 $ pele，因此精度测量值将对存在奇偶校验的黑暗扇区仪表孔（$ z _ {\ rm dark} $）具有敏感性。该程序还可以在前所未有的精度水平上对$τ$的异常磁矩$ g-2 $的外形进行测量。 $ 10^{ - 5} $级别的精确度可访问40〜Ab $^{ - 1} $，并且使用更多数据，它将开始接近$ 10^{ - 6} $级别。该技术将提供第三代信息的最精确信息，内容涉及MUON $ G-2 $4σ$异常的潜在物理解释。在此白皮书中还讨论了其他$τ$和QCD物理程序启用或增强具有偏振电子束的功能。本文包括研发中前进的摘要以及实施此升级并访问其令人兴奋的发现潜力所需的下一步。

Upgrading the SuperKEKB electron-positron collider with polarized electron beams opens a new program of precision physics at a center-of-mass energy of 10.58 GeV. This white paper describes the physics potential of this `Chiral Belle' program. It includes projections for precision measurements of $\sin^2θ_W$ that can be obtained from independent left-right asymmetry measurements of $e^+e^-$ transitions to pairs of electrons, muons, taus, charm and b-quarks. The $\sin^2θ_W$ precision obtainable at SuperKEKB will match that of the LEP/SLC world average, but at the centre-of-mass energy of 10.58 GeV. Measurements of the couplings for muons, charm, and $b$-quarks will be substantially improved and the existing $3σ$ discrepancy between the SLC $A_{LR}$ and LEP $A_{FB}^b$ measurements will be addressed. Precision measurements of neutral current universality will be more than an order of magnitude more precise than currently available. As the energy scale is well away from the $Z^0$-pole, the precision measurements will have sensitivity to the presence of a parity-violating dark sector gauge boson, $Z_{\rm dark}$. The program also enables the measurement of the anomalous magnetic moment $g-2$ form factor of the $τ$ to be made at an unprecedented level of precision. A precision of $10^{-5}$ level is accessible with 40~ab$^{-1}$ and with more data it would start to approach the $10^{-6}$ level. This technique would provide the most precise information from the third generation about potential new physics explanations of the muon $g-2$ $4σ$ anomaly. Additional $τ$ and QCD physics programs enabled or enhanced with having polarized electron beams are also discussed in this White Paper. This paper includes a summary of the path forward in R&D and next steps required to implement this upgrade and access its exciting discovery potential.

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