Limits on tensor coupling from neutron β decay
Limits on tensor coupling from neutron β decay
复制标题
中子 β 衰变张量耦合的限制
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
A. Young
中科院分区：
文献类型：
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作者：
R. Pattie;K. Hickerson;A. Young
Limits on the tensor couplings generating a Fierz interference term, b, in mixed Gamow-Teller Fermi decays can be derived by combining data from measurements of angular correlation parameters in neutron decay, the neutron lifetime, and $G_{ ext{V}}=G_{ ext{F}} V_{ud}$ as extracted from measurements of the $mathcal{F}t$ values from the $0^{+} o 0^{+}$ superallowed decays dataset. These limits are derived by comparing the neutron $eta$-decay rate as predicted in the standard model with the measured decay rate while allowing for the existence of beyond the standard model couplings. We analyze limits derived from the electron-neutrino asymmetry, $a$, or the beta-asymmetry, $A$, finding that the most stringent limits for $C_ ext{T}/C_ ext{A}$ under the assumption of no right-handed currents is $-0.0026 < C_ ext{T}/C_ ext{A} < 0.0024$ (95% C.L.) for the two most recent values of $A$.
Limits on the tensor couplings generating a Fierz interference term, b, in mixed Gamow-Teller Fermi decays can be derived by combining data from measurements of angular correlation parameters in neutron decay, the neutron lifetime, and $G_{ ext{V}}=G_{ ext{F}} V_{ud}$ as extracted from measurements of the $mathcal{F}t$ values from the $0^{+} o 0^{+}$ superallowed decays dataset. These limits are derived by comparing the neutron $eta$-decay rate as predicted in the standard model with the measured decay rate while allowing for the existence of beyond the standard model couplings. We analyze limits derived from the electron-neutrino asymmetry, $a$, or the beta-asymmetry, $A$, finding that the most stringent limits for $C_ ext{T}/C_ ext{A}$ under the assumption of no right-handed currents is $-0.0026 < C_ ext{T}/C_ ext{A} < 0.0024$ (95% C.L.) for the two most recent values of $A$.