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arXiv 0902.1056nucl-ex
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10- 4cm-1cm范围内核子间CP破坏力的新约束

New constraints for CP-violating forces between nucleons in the range 10-4 cm - 1 cm

A. P. Serebrov

摘要:

核子相互作用的范围10-4 cm - 1 cm是有趣的,因为它对应于一个中间粒子的质量范围内所谓的“轴子窗口”,尚未关闭的实验。超冷中子(UCN)在物质阱中储存时的去极化是由非极化物质表面附近的中子自旋的CP破坏赝磁旋进引起的。利用UCN退极化的实验极限,对标量、赝标量无量纲常数gS*gP和参数lam_PS的乘积设置了新的约束,通过新的赝标量玻色子确定了Yukawa型核子相互作用势质量为m_PS的类轴子粒子:对于10-3 cm < lam_PS < 1 cm,gS*gP* lam_PS ^2 <= 2.96*10-21 [cm ^2];对于10-4 cm < lam_PS < 10-3 cm,gS*gP* lam_PS ^2 <= 3.9*10-22 [cm ^2]。lam_PS面积的gS ~*gP极限由0.1cm提高到1cm,比原来的极限提高了4-5个数量级。指出了提高CP破坏赝磁旋进搜索精度的前景。讨论了在CP破坏理论模型框架下赝磁进动可能影响的估计。

英文摘要:

The range of nucleon interaction 10-4 cm - 1 cm is interesting because it corresponds to the mass range of a intermediate particle inside so named "axion window" that is not closed yet by experiment. Depolarization of ultracold neutrons (UCN) during their storage in material traps can be caused by CP-violating pseudo-magnetic precession of the neutron spin in the vicinity of the unpolarized substance surface. Using the experimental limits for UCN depolarization new constraints were set for the product of the scalar, pseudo-scalar dimensionless constants gS*gP and the parameter lam_PS, determining the Yukawa-type of the nucleon interaction potential via new pseudo-scalar boson (axion-like particle) with a mass of m_PS: gS*gP*lam_PS^2 <= 2.96*10-21 [cm^2] for 10-3 cm < lam_PS < 1 cm; gS*gP*lam_PS^2 <= 3.9*10-22 [cm^2] for 10-4 cm < lam_PS < 10-3 cm. Improvement of the limit for gS*gP in the area of lam_PS from 0.1 cm to 1 cm accounts for 4-5 orders of magnitude in comparision with previous limit. The prospects of increasing in accuracy search for CP-violating pseudo-magnetic precession are considered. The estimations of the possible effects of pseudo-magnetic precession in the frame of the theoretical models with CP-violation are discussed.

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