Abstract
Theories beyond the standard model often predict the existence of an additional neutral boson, the . Using data collected by the Belle II experiment during 2018 at the SuperKEKB collider, we perform the first searches for the invisible decay of a in the process and of a lepton-flavor-violating in . We do not find any excess of events and set 90% credibility level upper limits on the cross sections of these processes. We translate the former, in the framework of an theory, into upper limits on the coupling constant at the level of for .
- Received 24 December 2019
- Accepted 24 February 2020
DOI:https://doi.org/10.1103/PhysRevLett.124.141801
Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.
Published by the American Physical Society
Physics Subject Headings (PhySH)
synopsis
Closing in on the Boson
Published 6 April 2020
The Belle II experiment finds no boson in its first results, but it does constrain how strongly the particle might interact with standard model particles.
See more in Physics