Time-reversal violation in {beta} decay in the standard model
Time-reversal violation in {beta} decay in the standard model
复制标题
标准模型中 {beta} 衰变违反时间反转
DOI：
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发表时间：
1997
期刊：
影响因子：
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通讯作者：
I. Khriplovich
中科院分区：
文献类型：
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作者：
P. Herczeg;I. Khriplovich
我们估计了由于小林-Maskawa相{Delta}和{theta}项L{sub{theta}}导致的{beta}衰变中的时间反转破坏的大小。我们发现，{DELTA}对D和R关联的贡献不太可能大于10{SUP{minus}12}{vert_bar}a{vert_bar}({vert_bar}s{sub 2}S{SUB 3}S{SUB{DELTA}}{VERT_BAR}/10{SUP{负}3})和10{SUP{minus}14}{vert_bar}a{vert_bar}({vert_bar}s{sub 2}S{SUB 3}S的数量级{SUB{增量}}{vert_bar}/10{sup{负}3})，分别为中子的{vert_bar}a{vert_bar}{近似相等}1和{sup 19}Ne衰变。对于L对D和R的贡献，我们得出结论：它不太可能大于10{sup{minus}14}{vert_bar}a{vert_bar}({vert_bar}{theta}{vert_bar}/3{times}10{sup{-10})q/(m{subn}{-}m{subp})和10{sup{-12}{vert_bar}a{vert_bar}({vert_bar})的量级{theta}{vert_bar}/3{次}10{sup{减去}10})，(目前对S、S的实验极限分别为：{vert_bar}S{sub2}S{sub3}S{sub{Delta}}{vert_bar}{近似_lt}10{sup{负}3}和{vert_bar}{theta}{vert_bar}{approx_lt}3{times}10{sup{负}10})，其中q是衰变过程中的能量释放。对于{Delta}和L{sub{theta}}，D系数和R系数都是由远程贡献决定的。与T-奇关联的最佳实验极限(在{sup 19}Ne衰变中，D为10{sup{-3})相比，标准模型中D和R的小值给出了一个潜在的宽窗口，可以在其中寻找超出标准模型的T-破坏相互作用。然而，在这个窗口中，更多人将能够利用的范围取决于最终状态相互作用的贡献可以保持在可控制的水平。{版权所有}{ital1997}{italthe American Physitive Society}
We estimate the size of time-reversal violation in {beta} decay due to the Kobayashi-Maskawa phase {delta}, and the {theta} term L{sub {theta}}. We find that the contribution of {delta} to the D and R correlations is not likely to be larger than of the order of 10{sup {minus}12}{vert_bar}a{vert_bar}({vert_bar}s{sub 2}s{sub 3}s{sub {delta}}{vert_bar}/10{sup {minus}3}) and 10{sup {minus}14}{vert_bar}a{vert_bar}({vert_bar}s{sub 2}s{sub 3}s{sub {delta}}{vert_bar}/10{sup {minus}3}), respectively, where {vert_bar}a{vert_bar}{approx_equal}1 for neutron and {sup 19}Ne decay. For the contribution of L{sub {theta}} to D and R we conclude that it is not likely to be larger than of the order of 10{sup {minus}14}{vert_bar}a{vert_bar}({vert_bar}{theta}{vert_bar}/3{times}10{sup {minus}10})Q/(m{sub n}{minus}m{sub p}) and 10{sup {minus}12}{vert_bar}a{vert_bar}({vert_bar}{theta}{vert_bar}/3{times}10{sup {minus}10}), respectively (the present experimental limits on s{sub 2}s{sub 3}s{sub {delta}} and {theta} are {vert_bar}s{sub 2}s{sub 3}s{sub {delta}}{vert_bar}{approx_lt}10{sup {minus}3} and {vert_bar}{theta}{vert_bar}{approx_lt}3{times}10{sup {minus}10}), where Q is the energy release in the decay. For both {delta} and L{sub {theta}} the D and R coefficients are dominated by long-distance contributions. The small values of D and R in the standard model compared to the best experimental limit on T-odd correlations (10{sup {minus}3} for D in {sup 19}Ne decay) give potentially a wide window in which T-violating interactions beyond the standard model can be searched for. However, the range in this window thatmore » one will be able to exploit depends on the level at which the contributions of the final-state interactions can be kept under control. {copyright} {ital 1997} {ital The American Physical Society}« less