Test of the rotational invariance of the weak interaction

Riley Newman; Stephen Wiesner

doi:10.1103/PhysRevD.14.1

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Test of the rotational invariance of the weak interaction

Riley Newman^* and Stephen Wiesner^†

Columbia University, New York, New York 10027

^*Present address: University of California, Irvine, Irvine, California 92664. Sloan Foundation Fellow, 1970-1973.
^†Present address: 32100 Page Mill Road, Los Altos, California 94022.

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Phys. Rev. D 14, 1 – Published 1 July, 1976

DOI: https://doi.org/10.1103/PhysRevD.14.1

Abstract

We consider the possibility that the weak interaction might recognize a preferred direction in space. We report a search for anisotropy in the $β$ decay of unpolarized ${}^{90}Y$ nuclei. Our result may be expressed in terms of an expansion of the angular distribution of the decay electron: $Γ (θ) \propto 1 + ε_{1} cos θ + ε_{2} {cos}^{2} θ + \dots$ , where $θ$ is the angle between the direction of emission of the electron and any supposed asymmetry axis. We find for any axis that $| ε_{1} | < 10^{- 6.8}$ and $| ε_{2} | < 10^{- 5.7}$ (90% confidence limits).

References (4)

T. D. Lee and C. N. Yang, Phys. Rev. 104, 254 (1956)
E. DiCapua et al., Phys. Rev. 133, B1333 (1964)
D. Bryman and C. Picciotto, Phys. Rev. D 11, 1337 (1975)
T. Kinoshita, Phys. Rev. Lett. 2, 477 (1959)

[c1] T. D. Lee and C. N. Yang, Phys. Rev. 104, 254 (1956)

[c2] E. DiCapua et al., Phys. Rev. 133, B1333 (1964)

[c3] D. Bryman and C. Picciotto, Phys. Rev. D 11, 1337 (1975)

[c4] T. Kinoshita, Phys. Rev. Lett. 2, 477 (1959)

Physical Review D

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Test of the rotational invariance of the weak interaction

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