An estimate of the branching fraction of τ→πη′ν τ

S. Nussinov*, A. Soffer

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


We calculate the expected branching fraction of the second-class-current decay τ→πη′ντ, motivated by a recent experimental upper-limit determination of this quantity. The largest contribution to the branching fraction is due to the intermediate a0(980) scalar meson, assuming it is a ūd state. Smaller contributions arise from a0(1450), ρ(770), and ρ(1450). Our calculated values are substantially below the experimental upper limit, and are smaller still if the a0(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 a0(980), as well as provide information about new scalar interactions.

Original languageEnglish
Article number033010
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number3
StatePublished - 28 Aug 2009


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