Leptonic decays of the W boson in a strong electromagnetic field
Leptonic decays of the W boson in a strong electromagnetic field
复制标题
W玻色子在强电磁场中的轻子衰变
DOI：
10.1134/1.1825534
复制
发表时间：
2004
影响因子：
0.4
通讯作者：
A. Kurilin
中科院分区：
文献类型：
--
作者：
A. Kurilin
W玻色子衰变为轻子和中微子的几率，
$$W^ \pm \to \ell ^ \pm \bar \nu _\ell $$
计算了强电磁场中的在推导相对论性带电粒子波动方程精确解方法的基础上，得到了部分衰变宽度的精确解析表达式
$$\Gamma（）= \Gamma（W^ + \to \ell ^ + \bar \upper_\ell）$$
在外场强度参数的任意值下
$$ = eM_W^{ - 3} \sqrt { -（F_{\mu \upper} q^\upper）^2 } $$
.结果表明，在较弱的场区（λ = 1），真空中W玻色子标准衰变宽度的场致修正约为百分之几。随着外场强度参数的增加，W玻色子通过所讨论的通道衰变的部分宽度，即Γ（π），首先减小，在π =0.6116处达到绝对最小值，即Γmin=0.926Γ（0）。外场强度的进一步增加导致W玻色子衰变宽度的单调增长。在超强场（W_1）中，关于W玻色子衰变的部分宽度大于相应的部分宽度
$$\Gamma ^{（0）}（W^ \pm \to \ell ^ \pm \bar \updates_\ell）$$
在真空中放大几十倍
AbstractThe probability of W-boson decay into a lepton and a neutrino,
$$W^ \pm \to \ell ^ \pm \bar \nu _\ell $$
, in a strong electromagnetic field is calculated. On the basis of the method for deriving exact solutions to relativistic wave equations for charged particles, an exact analytic expression is obtained for the partial decay width
$$\Gamma () = \Gamma (W^ + \to \ell ^ + \bar \upsilon _\ell )$$
at an arbitrary value of the external-field-strength parameter
$$ = eM_W^{ - 3} \sqrt { - (F_{\mu \upsilon } q^\upsilon )^2 } $$
. It is found that, in the region of comparatively weak fields (ϰ≪1), field-induced corrections to the standard decay width of theW boson in a vacuum are about a few percent. As the external-field-strength parameter is increased, the partial width with respect to W-boson decay through the channel in question, Γ(ϰ), first decreases, the absolute minimum of Γmin=0.926Γ(0) being reached at ϰ=0.6116. A further increase in the external-field strength leads to a monotonic growth of the decay width of the W boson. In superstrong fields (ϰ≫1), the partial width with respect to W boson decay is greater than the corresponding partial width
$$\Gamma ^{(0)} (W^ \pm \to \ell ^ \pm \bar \upsilon _\ell )$$
in a vacuum by a factor of a few tens.