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Phys. Rev. Lett. 90, 202301 (2003) [4 pages]

Search for Time-Reversal Violation in the β Decay of Polarized 8Li Nuclei

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R. Huber, J. Lang, S. Navert*, and J. Sromicki
Institut für Teilchenphysik, Eidgenössische Technische Hochschule, CH-8093 Zürich, Switzerland

K. Bodek, St. Kistryn, and J. Zejma
Instytut Fizyki, Uniwersytet Jagielloński, PL-30059 Kraków, Poland

O. Naviliat-Cuncic
Laboratoire de Physique Corpusculaire de Caen, ISMRA-IN2P3, 14050 Caen, France

E. Stephan
Instytut Fizyki, Uniwersytet Śla̧ski, PL-40007 Katowice, Poland

W. Haeberli
University of Wisconsin, Madison, Wisconsin 53706, USA

Received 6 January 2003; published 20 May 2003

The transverse polarization of electrons emitted in the β decay of polarized 8Li nuclei has been measured. For the time-reversal violating triple correlation parameter we find R=(0.9±2.2)×10-3. This result is in agreement with the standard model and yields improved constraints on exotic tensor contributions to the weak interaction. Combined with other experimental results and using a model for the coupling constants, a new limit for the mass of a possible scalar leptoquark, mLQ>560   GeV/c2 (90% C.L.), is obtained.

© 2003 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.90.202301
DOI:
10.1103/PhysRevLett.90.202301
PACS:
24.80.+y, 11.30.Er, 23.40.Bw, 24.70.+s

*Permanent address: Swiss Nuclear Safety Inspectorate, CH-5232 Villigen HSK, Switzerland.

 
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