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arXiv 1904.13166nucl-ex
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利用储存环进行电偶极矩搜索

Electric dipole moment searches using storage rings

Frank Rathmann, Nikolai N. Nikolaev

摘要:

粒子物理学的标准模型(SM)无法解释我们宇宙中物质-反物质的明显不对称性。需要超出SM的物理,并且通过采用最高能量(例如,在LHC),或通过努力达到最终的精度和灵敏度(例如,在寻找电偶极矩中)。粒子的永久电偶极矩(EDM)违反时间反演$(T)$和宇称$(P)$不变性,并且通过$CPT$定理也违反$CP$。发现EDM将是SM之外物理学的一个强有力的指示,并且推动上限进一步为任何相应的理论模型提供了关键的测试,例如,超对称性到目前为止,EDM的研究主要集中在中性系统(中子、原子和分子)上。然而,储存环提供了通过观察EDM对环中自旋运动的影响来测量带电粒子的EDM的可能性。然而,质子和氘EDM的直接搜索具有达到超过$10^{-29}$ e $\cdot$ cm的灵敏度的潜力。由于位于于利希研究中心的冷却器同步加速器COSY提供了高达3.7 GeV/c动量的极化质子和氘核,它构成了这样一个实验计划的理想试验场和起点。除了讨论JEDI合作的成就,以及在COSY进行第一次直接氘EDM测量的努力之外,报告还强调了未来的技术发展,这将为专用环中的EDM搜索铺平道路。JEDI成功工作的最新进展是CPEDM协作的形成,该协作旨在设计可在CERN或COSY托管的EDM原型环,我们也将讨论该环。

英文摘要:

The Standard Model (SM) of Particle Physics is not capable to account for the apparent matter-antimatter asymmetry of our Universe. Physics beyond the SM is required and is either probed by employing highest energies (e.g., at LHC), or by striving for ultimate precision and sensitivity (e.g., in the search for electric dipole moments). Permanent electric dipole moments (EDMs) of particles violate both time reversal $(T)$ and parity $(P)$ invariance, and are via the $CPT$-theorem also $CP$-violating. Finding an EDM would be a strong indication for physics beyond the SM, and pushing upper limits further provides crucial tests for any corresponding theo\-retical model, e.g., SUSY. Up to now, EDM searches focused on neutral systems (neutrons, atoms, and molecules). Storage rings, however, offer the possibility to measure EDMs of charged particles by observing the influence of the EDM on the spin motion in the ring. Direct searches of proton and deuteron EDMs, however, bear the potential to reach sensitivities beyond $10^{-29}$ e$\cdot$cm. Since the Cooler Synchrotron COSY at the Forschungszentrum Jülich provides polarized protons and deuterons up to momenta of 3.7 GeV/c, it constitutes an ideal testing ground and starting point for such an experimental program. Besides the discussion of the achievements of the JEDI collaboration, and the description of an effort to perform a first direct deuteron EDM measurement at COSY, the report highlights in addition future technical developments that will pave the way toward EDM searches in dedicated rings. A recent advancement that grew out of the successful work performed by JEDI is the formation of the CPEDM Collaboration, which aims at the design of an EDM prototype ring that could be hosted either at CERN or at COSY, will be discussed as well.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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