Document Type
Article
Publication Date
2009
Abstract
We calculate the expected branching fraction of the second-class-current decay tau -> pi eta 'nu(tau), motivated by a recent experimental upper-limit determination of this quantity. The largest contribution to the branching fraction is due to the intermediate a(0)(980) scalar meson, assuming it is a (u) over bard state. Smaller contributions arise from a(0)(1450), rho(770), and rho(1450). Our calculated values are substantially below the experimental upper limit, and are smaller still if the a(0)(980) is a four-quark state, as often suggested. Thus, a precise measurement or tight upper limit has the potential to determine the nature of the a(0)(980), as well as provide information about new scalar interactions.
Recommended Citation
Nussinov, Shmuel, and Abner Soffer. "An estimate of the branching fraction of τ→ π η′ ν τ." Physical Review D 80.3 (2009): 033010. doi: 10.1103/PhysRevD.80.033010
Peer Reviewed
1
Copyright
American Physical Society
Comments
This article was originally published in Physical Review D, volume 80, issue 3, in 2009. DOI: 10.1103/PhysRevD.80.033010